[Federal Register Volume 86, Number 242 (Tuesday, December 21, 2021)]
[Proposed Rules]
[Pages 72322-72363]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-26814]



[[Page 72321]]

Vol. 86

Tuesday,

No. 242

December 21, 2021

Part II





 Department of Energy





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10 CFR Parts 429 and 431





Energy Conservation Program: Test Procedure for Automatic Commercial 
Ice Makers; Proposed Rule

  Federal Register / Vol. 86 , No. 242 / Tuesday, December 21, 2021 / 
Proposed Rules  

[[Page 72322]]


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DEPARTMENT OF ENERGY

10 CFR Parts 429 and 431

[EERE-2017-BT-TP-0006]
RIN 1904-AD81


Energy Conservation Program: Test Procedure for Automatic 
Commercial Ice Makers

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of 
Energy.

ACTION: Notice of proposed rulemaking and request for comment.

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SUMMARY: The U.S. Department of Energy (``DOE'') proposes to amend the 
test procedure for automatic commercial ice makers (``ACIMs''; ``ice 
makers'') to update incorporated references to the latest version of 
the industry standards; establish relative humidity and water hardness 
test conditions; provide additional detail regarding certain test 
conditions, settings, setup requirements, and calculations; include a 
voluntary measurement of potable water use; clarify certification and 
reporting requirements; and add enforcement provisions. This notice of 
proposed rulemaking (``NOPR'') also proposes to provide additional 
detail to the DOE test procedure to improve the representativeness and 
repeatability of the current ACIM test procedure. DOE is seeking 
comment from interested parties on the proposal.

DATES: DOE will accept comments, data, and information regarding this 
proposal no later than February 22, 2022. See section V, ``Public 
Participation,'' for details. DOE will hold a webinar on Monday, 
January 24, 2022, from 1:00 p.m. to 4:00 p.m. See section V, ``Public 
Participation,'' for webinar registration information, participant 
instructions, and information about the capabilities available to 
webinar participants. If no participants register for the webinar, it 
will be cancelled.

ADDRESSES: Interested persons are encouraged to submit comments using 
the Federal eRulemaking Portal at www.regulations.gov. Follow the 
instructions for submitting comments. Alternatively, interested persons 
may submit comments, identified by docket number EERE-2017-BT-TP-0006, 
by any of the following methods:
    (1) Federal eRulemaking Portal: www.regulations.gov. Follow the 
instructions for submitting comments.
    (2) Email: [email protected]. Include the docket number 
EERE-2017-BT-TP-0006 in the subject line of the message.
    No telefacsimilies (faxes) will be accepted. For detailed 
instructions on submitting comments and additional information on the 
rulemaking process, see section V of this document.
    Although DOE has routinely accepted public comment submissions 
through a variety of mechanisms, including postal mail and hand 
delivery/courier, the Department has found it necessary to make 
temporary modifications to the comment submission process in light of 
the ongoing corona virus 2019 (``COVID-19'') pandemic. DOE is currently 
suspending receipt of public comments via postal mail and hand 
delivery/courier. If a commenter finds that this change poses an undue 
hardship, please contact Appliance Standards Program staff at (202) 
586-1445 to discuss the need for alternative arrangements. Once the 
Covid-19 pandemic health emergency is resolved, DOE anticipates 
resuming all of its regular options for public comment submission, 
including postal mail and hand delivery/courier.
    Docket: The docket, which includes Federal Register notices, public 
meeting attendee lists and transcripts (if a public meeting is held), 
comments, and other supporting documents/materials, is available for 
review at www.regulations.gov. All documents in the docket are listed 
in the www.regulations.gov index. However, some documents listed in the 
index, such as those containing information that is exempt from public 
disclosure, may not be publicly available.
    The docket web page can be found at www1.eere.energy.gov/buildings/appliance_standards/standards.aspx?productid=53&action=viewlive. The 
docket web page contains instructions on how to access all documents, 
including public comments, in the docket. See section V for information 
on how to submit comments through www.regulations.gov.

FOR FURTHER INFORMATION CONTACT: Dr. Stephanie Johnson, U.S. Department 
of Energy, Office of Energy Efficiency and Renewable Energy, Building 
Technologies Office, EE-5B, 1000 Independence Avenue SW, Washington, DC 
20585-0121. Telephone: (202) 287-1943. Email: 
[email protected].
    Ms. Sarah Butler, U.S. Department of Energy, Office of the General 
Counsel, GC-33, 1000 Independence Avenue SW, Washington, DC 20585-0121. 
Telephone: (202) 586-1777. Email: [email protected].
    For further information on how to submit a comment, review other 
public comments and the docket, or participate in a public meeting (if 
one is held), contact the Appliance and Equipment Standards Program 
staff at (202) 287-1445 or by email: 
[email protected].

SUPPLEMENTARY INFORMATION: DOE proposes to incorporate by reference the 
following industry standards into 10 CFR part 431:

    Air Conditioning, Heating, and Refrigeration Institute 
(``AHRI'') Standard 810-2016 with Addendum 1, ``Performance Rating 
of Automatic Commercial Ice-Makers,'' approved January 2018; and
    American National Standards Institute (``ANSI'')/American 
Society of Heating, Refrigerating and Air-Conditioning Engineers 
(``ASHRAE'') Standard 29-2015, ``Method of Testing Automatic Ice 
Makers,'' approved April 30, 2015.

    Copies of AHRI standards can be obtained from the Air-Conditioning, 
Heating, and Refrigeration Institute, 2111 Wilson Blvd., Suite 500, 
Arlington, VA 22201, (703) 524-8800, [email protected], or http://www.ahrinet.org.
    Copies of ASHRAE standards can be purchased from the American 
Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 
1791 Tullie Circle, NE, Atlanta, GA 30329, (404) 636-8400, 
[email protected], or www.ashrae.org.
    For a further discussion of these standards, see section IV.M of 
this document.

Table of Contents

I. Authority and Background
    A. Authority
    B. Background
II. Synopsis of the Notice of Proposed Rulemaking
III. Discussion
    A. Scope
    B. Definitions
    1. Refrigerated Storage ACIM
    2. Portable ACIM
    3. Industry Standard Definitions
    C. Industry Test Standards Incorporated by Reference
    D. Additional Proposed Amendments
    1. Low-Capacity ACIMs
    2. Stability Criteria
    3. Test Conditions
    4. Test Setup and Equipment Configurations
    5. Modulating Capacity Ice Makers
    6. Standby Energy Use and Energy Use Associated With Ice Storage
    7. Calculations and Rounding Requirements
    8. Potable Water Use
    E. Representations of Energy Use and Energy Efficiency
    1. Sampling Plan and Determination of Represented Values
    2. Test Sample Value Rounding Requirements
    3. Enforcement Provisions
    F. Test Procedure Costs and Harmonization
    1. Test Procedure Costs and Impact

[[Page 72323]]

    2. Harmonization With Industry Standards
    G. Compliance Date and Waivers
IV. Procedural Issues and Regulatory Review
    A. Review Under Executive Order 12866
    B. Review Under the Regulatory Flexibility Act
    C. Review Under the Paperwork Reduction Act of 1995
    D. Review Under the National Environmental Policy Act of 1969
    E. Review Under Executive Order 13132
    F. Review Under Executive Order 12988
    G. Review Under the Unfunded Mandates Reform Act of 1995
    H. Review Under the Treasury and General Government 
Appropriations Act, 1999
    I. Review Under Executive Order 12630
    J. Review Under Treasury and General Government Appropriations 
Act, 2001
    K. Review Under Executive Order 13211
    L. Review Under Section 32 of the Federal Energy Administration 
Act of 1974
    M. Description of Materials Incorporated by Reference
V. Public Participation
    A. Participation in the Webinar
    B. Submission of Comments
    C. Issues on Which DOE Seeks Comment
VI. Approval of the Office of the Secretary

I. Authority and Background

    ACIMs are included in the list of ``covered equipment'' for which 
DOE is authorized to establish and amend energy conservation standards 
and test procedures. (42 U.S.C. 6311(1)(F)) DOE's energy conservation 
standards and test procedures for ACIMs are currently prescribed at 10 
CFR 431.136 and 10 CFR 431.134, respectively. The following sections 
discuss DOE's authority to establish test procedures for ACIMs and 
relevant background information regarding DOE's consideration of test 
procedures for this equipment.

A. Authority

    The Energy Policy and Conservation Act, as amended (``EPCA''),\1\ 
authorizes DOE to regulate the energy efficiency of a number of 
consumer products and certain industrial equipment. (42 U.S.C. 6291-
6317) Title III, Part C \2\ of EPCA, added by Public Law 95-619, Title 
IV, section 441(a), established the Energy Conservation Program for 
Certain Industrial Equipment, which sets forth a variety of provisions 
designed to improve energy efficiency. This equipment includes ACIMs, 
the subject of this document. (42 U.S.C. 6311(1)(F))
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    \1\ All references to EPCA in this document refer to the statute 
as amended through the Energy Act of 2020, Public Law 116-260 (Dec. 
27, 2020).
    \2\ For editorial reasons, upon codification in the U.S. Code, 
Part C was redesignated Part A-1.
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    The energy conservation program under EPCA consists essentially of 
four parts: (1) Testing, (2) labeling, (3) Federal energy conservation 
standards, and (4) certification and enforcement procedures. Relevant 
provisions of EPCA include definitions (42 U.S.C. 6311), test 
procedures (42 U.S.C. 6314), labeling provisions (42 U.S.C. 6315), 
energy conservation standards (42 U.S.C. 6313), and the authority to 
require information and reports from manufacturers (42 U.S.C. 6316).
    The Federal testing requirements consist of test procedures that 
manufacturers of covered equipment must use as the basis for: (1) 
Certifying to DOE that their equipment complies with the applicable 
energy conservation standards adopted pursuant to EPCA (42 U.S.C. 
6316(a); 42 U.S.C. 6295(s)), and (2) making representations about the 
efficiency of that equipment (42 U.S.C. 6314(d)). Similarly, DOE uses 
these test procedures to determine whether the equipment complies with 
relevant standards promulgated under EPCA. (42 U.S.C. 6316(a); 42 
U.S.C. 6295(s))
    Federal energy efficiency requirements for covered equipment 
established under EPCA generally supersede State laws and regulations 
concerning energy conservation testing, labeling, and standards. (42 
U.S.C. 6316(a) and (b); 42 U.S.C. 6297) DOE may, however, grant waivers 
of Federal preemption for particular State laws or regulations, in 
accordance with the procedures and other provisions of EPCA. (42 U.S.C. 
6316(b)(2)(D))
    Under 42 U.S.C. 6314, EPCA sets forth the criteria and procedures 
DOE must follow when prescribing or amending test procedures for 
covered equipment. EPCA requires that any test procedures prescribed or 
amended under this section must be reasonably designed to produce test 
results which reflect energy efficiency, energy use, or estimated 
annual operating cost of a given type of covered equipment during a 
representative average use cycle and requires that test procedures not 
be unduly burdensome to conduct. (42 U.S.C. 6314(a)(2))
    EPCA prescribed the first Federal test procedure for ACIMs, 
directing that the ACIM test procedure shall be the AHRI Standard 810-
2003, ``Performance Rating of Automatic Commercial Ice-Makers'' (``AHRI 
Standard 810-2003''). (42 U.S.C. 6314(a)(7)(A)) EPCA requires if AHRI 
Standard 810-2003 is amended, that DOE must amend the Federal test 
procedures as necessary to be consistent with the amended AHRI 
standard, unless DOE determines, by rule, published in the Federal 
Register and supported by clear and convincing evidence, that to do so 
would not meet the requirements for test procedures to be 
representative of actual energy efficiency and to not be unduly 
burdensome to conduct. (42 U.S.C. 6314(a)(7)(B)(i))
    EPCA also requires that at least once every 7 years, DOE evaluate 
test procedures for each type of covered equipment, including ACIMs, to 
determine whether amended test procedures would more accurately or 
fully comply with the requirements for the test procedures to not be 
unduly burdensome to conduct and be reasonably designed to produce test 
results that reflect energy efficiency, energy use, and estimated 
operating costs during a representative average use cycle. (42 U.S.C. 
6314(a)(1))
    In addition, if the Secretary determines that a test procedure 
amendment is warranted, the Secretary must publish proposed test 
procedures in the Federal Register and afford interested persons an 
opportunity (of not less than 45 days' duration) to present oral and 
written data, views, and arguments on the proposed test procedures. (42 
U.S.C. 6314(b)) If DOE determines that test procedure revisions are not 
appropriate, DOE must publish its determination not to amend the test 
procedures. DOE is publishing this NOPR in satisfaction of the 7-year 
review requirement specified in EPCA. (42 U.S.C. 6314(a)(1)(A)(ii))

B. Background

    DOE's existing test procedures for ACIMs appear at Title 10 of the 
Code of Federal Regulations (``CFR'') part 431, section 134.
    In a January 11, 2012 test procedure final rule (``January 2012 
final rule''), DOE satisfied its statutory obligation under 42 U.S.C. 
6314(a)(7)(B) to amend the ACIM test procedure by incorporating by 
reference the following: AHRI Standard 810-2007 with Addendum 1 ``2007 
Standard for Performance Rating of Automatic Commercial Ice Makers'' 
(``AHRI Standard 810-2007'') and ANSI/ASHRAE Standard 29-2009 ``Method 
of Testing Automatic Ice Makers,'' (including Errata Sheets issued 
April 8, 2010 and April 21, 2010), approved January 28, 2009 (``ASHRAE 
Standard 29-2009''). 77 FR 1591. Consistent with the updated AHRI 
Standard 810-2007, the amended DOE test procedure provides for the 
testing of equipment with capacities from 50 to 4,000 lb/24 h. The 
updated DOE test procedure also (1) provides test methods for 
continuous type ice makers and batch type ice makers that produce ice 
types other than cubes, (2) standardizes the measurement of energy and 
water use for continuous type ice makers with respect to ice hardness, 
(3) clarifies the test method and reporting requirements

[[Page 72324]]

for remote condensing ice makers designed for connection to remote 
compressor racks, and (4) discontinues the use of an energy use rate 
calculation and instead references the calculation of energy use per 
100 pounds of ice as specified in ASHRAE Standard 29-2009. Id. The 
amended test procedure was required to be used for representations of 
energy use beginning on January 7, 2013. Id.
    On March 19, 2019, DOE published a Request for Information 
(``RFI'') to solicit comment and information to inform DOE's 
determination of whether to propose amendments to the current ACIM test 
procedure. 84 FR 9979 (``March 2019 RFI''). DOE requested comment 
regarding new versions of the industry standards that the current DOE 
test procedure incorporates by reference; consideration of additional 
specifications and amendments that may improve the accuracy of the test 
procedure or reduce the testing burden on manufacturers; and any 
additional topics that may inform DOE's decisions in a test procedure 
rulemaking, including methods to reduce regulatory burden while 
ensuring the procedure's accuracy. Id.
    DOE received comments in response to the March 2019 RFI from the 
interested parties listed in Table I.1.

               Table I.1--March 2019 RFI Written Comments
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                                   Reference in this
         Organization(s)                 NOPR          Organization type
------------------------------------------------------------------------
Howe Corporation................  Howe..............  Manufacturer.
Air-Conditioning, Heating, &      AHRI..............  Trade Association.
 Refrigeration Institute.
Appliance Standards Awareness     Joint Commenters..  Energy Efficiency
 Project (``ASAP''), Natural                           Organizations.
 Resources Defense Council
 (``NRDC''), Northwest Energy
 Efficiency Alliance (``NEEA'').
Brema Group S.p.A...............  Brema.............  Manufacturer.
Hoshizaki America, Inc..........  Hoshizaki.........  Manufacturer.
------------------------------------------------------------------------

    A parenthetical reference at the end of a quoted or paraphrased 
comment provides the location of the item in the public record.\3\
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    \3\ The parenthetical reference provides a reference for 
information located in the docket of DOE's rulemaking to consider 
amended test procedures for ACIMs (EERE-2017-BT-TP-0006, which is 
maintained at www.regulations.gov/#!docketDetail;D=EERE-2017-BT-TP-
0006). The references are arranged as follows: (commenter name, 
comment docket ID number, page of that document).
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II. Synopsis of the Notice of Proposed Rulemaking

    In this NOPR, DOE proposes to update 10 CFR 429.45, ``Automatic 
commercial ice makers;'' 10 CFR 429.134, ``Product-specific enforcement 
provisions,'' 10 CFR 431.132, ``Definitions concerning automatic 
commercial ice makers;'' 10 CFR 431.133, ``Materials incorporated by 
reference;'' and 10 CFR 431.134, ``Uniform test methods for the 
measurement of energy and water consumption of automatic commercial ice 
makers'' as follows:

    (1) Updating the referenced methods of test to AHRI Standard 
810-2016 and ASHRAE Standard 29-2015, except for the provisions as 
discussed;
    (2) Including definitions and test requirements for low-capacity 
ACIMs;
    (3) Incorporating changes to improve test procedure 
representativeness, accuracy, and precision, which include: 
Clarifying calorimeter constant test instructions; specifying 
ambient temperature measurement requirements; establishing a 
relative humidity test condition; establishing an allowable range of 
water hardness; clarifying the stability requirements that were 
updated in ASHRAE Standard 29-2015; clarifying water pressure 
requirements; and increasing the tolerance on capacity collection 
time;
    (4) Specifying certain test settings, conditions, and 
installations, including: Clarifying ice hardness test conditions; 
clarifying baffle use for testing; amending clearance requirements; 
clarifying automatic purge control settings; and providing 
instructions for testing ACIMs with automatic dispensers;
    (5) Including voluntary provisions for measuring potable water 
use;
    (6) Including clarifying language for calculations, rounding 
requirements, sampling plan calculations, and certification 
instructions; and
    (7) Adding language to the equipment-specific enforcement 
provisions.

    DOE's proposed actions are summarized in Table II.1 compared to the 
current test procedure as well as the reason for the proposed change.

  Table II.1--Summary of Changes in Proposed Test Procedure Relative to
                         Current Test Procedure
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                                  Proposed test
 Current DOE test procedure         procedure            Attribution
------------------------------------------------------------------------
References industry standard  Updates reference to  Adopt latest
 AHRI Standard 810-2007,       industry standard     industry standards.
 which refers to ASHRAE        AHRI Standard 810-
 Standard 29-2009.             2016, which refers
                               to ASHRAE Standard
                               29-2015.
Scope includes ACIMs with     Includes definitions  Ensures
 capacities between 50 and     for low-capacity      representative,
 4,000 lb/24 h.                ACIMs and expands     repeatable, and
                               test procedure        reproducible
                               scope to cover all    measures of
                               ACIMs with            performance for
                               capacities up to      ACIMs currently not
                               4,000 lb/24 h;        in scope.
                               includes additional
                               instructions to
                               allow for testing
                               low-capacity ACIMs.
Does not specify the ambient  Specifies that the    Harmonize with
 & water temperature and       harvested ice used    industry standard;
 water pressure when           to determine the      improves
 harvesting ice to be used     ice hardness factor   representativeness,
 in determining the ice        must be produced at   repeatability, and
 hardness factor.              the Standard Rating   reproducibility.
                               Conditions
                               presented in
                               section 5.1.2 of
                               AHRI Standard 810-
                               2016.

[[Page 72325]]

 
Does not specify where to     Specifies that the    Improves
 measure the temperature of    temperature           representativeness,
 the ice block used to         measurement           repeatability, and
 determine the calorimeter     location must be at   reproducibility.
 constant.                     approximately the
                               geometric center of
                               the block of ice
                               and that any water
                               on the block of ice
                               must be wiped off
                               the surface prior
                               to placement in the
                               calorimeter.
Capacity measurements begin   All cycles or         Clarify industry TP
 after the unit has been       samples used for      to reduce test
 stabilized.                   the capacity test     burden while
                               meet the stability    maintaining
                               criteria.             representative
                                                     results; harmonize
                                                     with industry
                                                     standard.
Continuous ACIMs shall be     Continuous ACIMs      Harmonizes with
 considered stabilized when    shall be considered   industry TP update,
 the weights of three          stabilized when the   but timing
 consecutive 14.4-minute       weights of two        tolerance increased
 samples taken within a 1.5-   consecutive 15.0      by DOE to reduce
 hour period do not vary by    min 9.0   test burden while
 more than 2       s samples having no   maintaining
 percent.                      more than 5 minutes   representative
                               between the end of    results.
                               a sample and the
                               start of the next
                               sample do not vary
                               more than 2 percent or
                               0.055 pounds,
                               whichever is
                               greater.
Does not specify relative     Adds relative         Improves
 humidity test condition.      humidity test         representativeness,
                               condition of 35       repeatability, and
                               5.0       reproducibility.
                               percent.
Does not specify water        Specifies that water  Improves
 hardness test condition.      for testing must      representativeness,
                               have a maximum        repeatability, and
                               water hardness of     reproducibility.
                               180 mg of calcium
                               carbonate per liter
                               of water (180 mg/L).
Use of baffles and purge      Incorporates          Improves
 setting addressed in          existing guidance     representativeness,
 guidance.                     into the test         repeatability, and
                               procedure; allow      reproducibility.
                               for an alternate
                               ambient measurement
                               location instead of
                               shielding the
                               thermocouple and
                               for rear clearances
                               which are less than
                               the required inlet
                               measurement
                               distance.
ACIMs shall be tested with a  ACIMs shall be        Improves
 clearance of 18 inches on     tested according to   representativeness,
 all four sides.               the manufacturer's    repeatability, and
                               specified minimum     reproducibility and
                               rear clearances       updates certain
                               requirements, or 3    requirements to
                               feet from the rear    harmonize with
                               of the ACIMs,         industry standard.
                               whichever is less;
                               all other sides of
                               the ACIMs and all
                               sides of the remote
                               condensers, if
                               applicable, shall
                               be tested with a
                               minimum clearance
                               of 3 feet or the
                               minimum clearance
                               specified by the
                               manufacturer,
                               whichever is
                               greater.
Does not specify use of       Specifies that        Improves
 weighted/unweighted sensors   unweighted sensors    representativeness,
 to measure ambient            shall be used for     repeatability, and
 temperature.                  all ambient           reproducibility.
                               temperature
                               measurements.
Does not specify how to       Specifies that the    Improves
 measure water inlet           water pressure        representativeness,
 pressure requirements.        shall be measured     repeatability, and
                               within 8 inches of    reproducibility.
                               the ACIM and be
                               within the
                               allowable range
                               within 5 seconds of
                               water flowing into
                               the ACIM.
Does not specify how to       Provides instruction  In response to
 collect capacity samples      to test certain       waiver.
 for ACIMs with dispensers.    ACIMs with an
                               automatic dispenser
                               with an empty
                               internal bin at the
                               start of the test
                               and to allow for
                               the continuous
                               production and
                               dispensing of ice,
                               with samples
                               collected from the
                               dispenser through a
                               conduit connected
                               to an external bin
                               one-half full of
                               ice.
Does not specifically         Includes voluntary    Harmonize with
 reference potable water       reference to          industry standard;
 usage.                        potable water use     improves
                               in 10 CFR 431.134     representativeness,
                               based on AHRI 810-    repeatability, and
                               2016.                 reproducibility.
Rounds energy use in          Rounds energy use in  Harmonize with
 multiples of 0.1 kWh/100 lb   multiples of 0.01     latest industry
 and harvest rate to the       kWh/100 lb; rounds    standard; improves
 nearest 1 lb/24 h.            harvest rate to the   representativeness,
                               nearest 0.1 lb/24 h   repeatability, and
                               for ACIMs with        reproducibility.
                               harvest rates of 50
                               lb/24 h or less.
Does not specify if           Clarifies that the    Improves
 intermediate values used in   calculations of       representativeness,
 calculations should be        intermediate values   repeatability, and
 rounded.                      be performed with     reproducibility.
                               raw measured data
                               and only the final
                               results be rounded;
                               clarifies that the
                               energy use,
                               condenser water
                               use, and potable
                               water use (if
                               voluntarily
                               measured) be
                               calculated by
                               averaging the
                               calculated values
                               for the three
                               measured samples
                               for each respective
                               metric.
Does not specify how to       Specifies that the    Improves
 calculate the percent         percent difference    representativeness,
 difference between two        between two           repeatability, and
 measurements.                 measurements be       reproducibility.
                               calculated by
                               taking the absolute
                               difference between
                               two measurements
                               and divide by the
                               average of the two
                               measurements.

[[Page 72326]]

 
References ``maximum energy   Removes ``maximum''   Improves clarity.
 use'' and ``maximum           from the referenced
 condenser water use'' at 10   terms; adds
 CFR 429.45, no reference to   reference to
 water use in sampling plan.   condenser water use
                               in sampling plan.
Defines ``cube type ice'' at  Removes ``cube type   Improves clarity.
 10 CFR 431.132.               ice'' from 10 CFR
                               431.132; removes
                               reference to cube
                               type ice in the
                               definition of
                               ``batch type ice
                               maker''.
Does not specify how the      The represented       Improves
 represented value of          value of harvest      representativeness,
 harvest rate for each basic   rate for the basic    repeatability, and
 model should be determined    model is determined   reproducibility.
 based on the test sample.     as the mean of the
                               harvest rate for
                               each tested unit.
Does not specify rounding     Specifies that        Improves
 requirements for              represented values    representativeness,
 represented values in 10      determined in 10      repeatability, and
 CFR 429.45.                   CFR 429.45 must be    reproducibility.
                               rounded consistent
                               with the test
                               procedure rounding
                               instructions, upon
                               the compliance date
                               of any amended
                               standards.
No equipment-specific         The certified         Improves clarity.
 enforcement provisions.       harvest rate will
                               be considered for
                               determination of
                               the maximum energy
                               consumption and
                               maximum condenser
                               water use levels
                               only if the average
                               measured harvest
                               rate is within five
                               percent of the
                               certified harvest
                               rate, otherwise the
                               measured harvest
                               rate will be used
                               to determine the
                               applicable
                               standards.
------------------------------------------------------------------------

    DOE has tentatively determined that while the proposed amendments 
would introduce additional test requirements compared to the current 
approach, the impact to the measured efficiency of certified ACIMs is 
expected to be de minimis. Accordingly, DOE does not expect that 
manufacturers would be required to re-test or re-certify existing ACIM 
models as a result of the proposals in this NOPR. Additionally, for 
low-capacity ACIMs, testing according to the proposed test procedure 
would not be required until the compliance date of any energy 
conservation standards for that equipment. DOE expects that any low-
capacity ACIM manufacturers currently making representations of energy 
consumption are already doing so according to the existing DOE test 
procedure, and similarly would not be required to re-test their 
equipment according to the proposed test procedure. While DOE does not 
expect that manufacturers would incur additional cost as a result of 
the proposed test procedure, DOE provides a discussion of testing costs 
in section III.F.1 of this NOPR. DOE has also tentatively determined 
that the proposed test procedure would not be unduly burdensome to 
conduct. Discussion of DOE's proposed actions are addressed in detail 
in section III of this NOPR.

III. Discussion

    In the following sections, DOE describes the proposed amendments to 
the test procedures for ACIMs. This proposal reflects DOE's review of 
the updates to the referenced industry test procedures and the comments 
received in response to the March 2019 RFI and other relevant 
information. DOE seeks input from the public to assist with its 
evaluation of proposed amendments to the test procedures for ACIMs. In 
addition, DOE welcomes comments on other relevant issues that may not 
specifically be identified in this document.

A. Scope

    DOE defines automatic commercial ice maker as ``a factory-made 
assembly (not necessarily shipped in 1 package) that (1) consists of a 
condensing unit and ice-making section operating as an integrated unit, 
with means for making and harvesting ice; and (2) may include means for 
storing ice, dispensing ice, or storing and dispensing ice.'' 10 CFR 
431.132 (see also, 42 U.S.C. 6311(19)). The existing DOE test procedure 
for ACIMs applies to both batch-type and continuous-type ice makers \4\ 
with harvest rates between 50 and 4,000 lb/24 h. DOE further subdivides 
the batch-type and continuous-type equipment ACIM categories into 
several distinct equipment classes based on the equipment 
configuration, condenser cooling method, and harvest rate in pounds per 
24 hours (lb/24 h), as shown in Table III.1. See also, 10 CFR 
431.136(c) and (d). ACIM configurations include individual ice-making 
heads, remote condensing equipment (both with and without a remote 
compressor), and self-contained equipment. Ice-making heads and self-
contained equipment can be air- or water-cooled; however, DOE 
prescribes standards only for remote condensing equipment that are air-
cooled. Self-contained ACIMs include a means for storing ice, while 
ice-making heads and remote condensing equipment are typically paired 
with separate ice storage bins. At 10 CFR 431.132, DOE defines these 
related components, as well as several metrics related to ACIMs.
---------------------------------------------------------------------------

    \4\ A batch type ice maker is defined as an ice maker that has 
alternate freezing and harvesting periods, including ACIMs that 
produce cube type ice and other batch technologies. 10 CFR 431.132. 
Batch type ice makers also produce tube type ice and fragmented ice. 
A continuous-type ice maker is defined as an ice maker that 
continually freezes and harvests ice at the same time. Id. 
Continuous type ice makers primarily produce flake and nugget ice.

[[Page 72327]]



                                 Table III.1--Summary of ACIM Equipment Classes
----------------------------------------------------------------------------------------------------------------
       Equipment configuration            Condenser cooling       Ice-making mechanism    Harvest rate (lb/24 h)
----------------------------------------------------------------------------------------------------------------
Ice-Making Head......................  Water..................  Batch..................  <300
                                                                                         >=300 and >850
                                                                                         >=850 and <1,500
                                                                                         >=1,500 and <2,500
                                                                                         >=2,500 and <4,000
                                                               -------------------------------------------------
                                                                Continuous.............  <801
                                                                                         >=801 and >2,500
                                                                                         >=2,500 and >4,000
                                      --------------------------------------------------------------------------
                                       Air....................  Batch..................  <300
                                                                                         >=300 and >800
                                                                                         >=800 and <1,500
                                                                                         >=1,500 and <4,000
                                                               -------------------------------------------------
                                                                Continuous.............  <310
                                                                                         >=310 and >820
                                                                                         >=820 and <4,000
----------------------------------------------------------------------------------------------------------------
Remote-Condensing (but not remote      Air....................  Batch..................  <988
 compressor).                                                                            >=988 and <4,000
                                                               -------------------------------------------------
                                                                Continuous.............  <800
                                                                                         >=800 and <4,000
----------------------------------------------------------------------------------------------------------------
Remote-Condensing and Remote           Air....................  Batch..................  <930
 Compressor.                                                                             >=930 and <4,000
                                                               -------------------------------------------------
                                                                Continuous.............  <800
                                                                                         >=800 and <4,000
----------------------------------------------------------------------------------------------------------------
Self-Contained.......................  Water..................  Batch..................  <200
                                                                                         >=200 and <2,500
                                                                                         >=2,500 and <4,000
                                                               -------------------------------------------------
                                                                Continuous.............  <900
                                                                                         >=900 and <2,500
                                                                                         >=2,500 and <4,000
                                      --------------------------------------------------------------------------
                                       Air....................  Batch..................  <110
                                                                                         >=110 and <200
                                                                                         >=200 and <4,000
                                                               -------------------------------------------------
                                                                Continuous.............  <200
                                                                                         >=200 and <700
                                                                                         >=700 and <4,000
----------------------------------------------------------------------------------------------------------------

    The regulatory and statutory definitions of ACIM are not limited by 
harvest rate (i.e., capacity). (See 10 CFR 431.132 and 42 U.S.C. 
6311(19), respectively.) However, the scope of DOE's test procedure is 
limited explicitly to ACIMs with capacities between 50 and 4,000 lb/24 
h. 10 CFR 431.134(a). DOE is aware of ACIMs available in the market 
with harvest rates less than or equal to 50 lb/24 h (hereafter referred 
to as ``low-capacity ACIMs'').
    DOE had previously considered test procedures for low-capacity 
ACIMs in a December 16, 2014 NOPR for test procedures for miscellaneous 
refrigeration products. 79 FR 74894 (``December 2014 MREF Test 
Procedure NOPR'').\5\ In a supplemental notice of proposed 
determination regarding miscellaneous refrigeration products coverage, 
DOE noted that a working group established to consider test procedures 
and standards for miscellaneous refrigeration products made two 
observations: (1) Ice makers are fundamentally different from the other 
product categories considered as miscellaneous refrigeration products; 
and (2) ice makers are covered as commercial equipment and there is no 
clear differentiation between consumer and commercial ice makers. 81 FR 
11454, 11456 (Mar. 4, 2016). In a 2016 final rule, DOE determined that 
low-capacity ACIMs were significantly different from the other product 
categories considered, and low-capacity ACIMs were not included in the 
scope of coverage or test procedure for miscellaneous refrigeration 
products. 81 FR 46773 (July 18, 2016).
---------------------------------------------------------------------------

    \5\ Available at www.regulations.gov/document?D=EERE-2013-BT-TP-0029-0011.
---------------------------------------------------------------------------

    In response to the March 2019 RFI, the Joint Commenters supported 
the establishment of a test procedure for low-capacity ACIMs, stating 
that such a test procedure would ensure that information provided to 
consumers about harvest rates and/or efficiency is based on a 
standardized test method. They asserted that these smaller units could 
likely be tested with a test procedure similar to the existing test 
procedure for larger-capacity units. (Joint Commenters, No. 2 at p. 1)

[[Page 72328]]

    On December 8, 2020, DOE published an early assessment review for 
amended energy conservation standards for miscellaneous refrigeration 
products (``December 2020 MREF Standards RFI''). In response to the 
December 2020 MREF Standards RFI, ASAP and NEEA supported establishing 
standards for low-capacity ACIMs through the ACIM rulemaking.\6\
---------------------------------------------------------------------------

    \6\ See documents number 4 and 7 available at 
www.regulations.gov/document/EERE-2020-BT-STD-0039-0001/comment.
---------------------------------------------------------------------------

    In the December 2014 MREF Test Procedure NOPR, DOE stated that it 
is aware that manufacturers are using the DOE ACIM test procedure to 
represent the energy use of consumer ice makers (i.e., low-capacity 
ACIMs). 79 FR 74894, 74916. DOE also stated that it is unaware of any 
test procedure that has been specifically developed for consumer ice 
makers (i.e., low-capacity ACIMs). Id. DOE is still unaware of an 
industry test procedure for testing and rating low-capacity ACIMs.
    As stated previously, DOE is aware of low-capacity ACIM models 
available on the market. The energy performance of these models is 
typically either not specified or is based on the existing industry 
test procedures. However, the lack of a DOE test procedure could allow 
for manufacturers to make performance claims using other unknown test 
procedures, which could result in inconsistent ratings from model to 
model. Establishing a test procedure for low-capacity ACIMs would allow 
purchasers to make more informed decisions regarding the performance of 
low-capacity ACIMs as compared to the currently covered ACIM equipment, 
if a low-capacity ACIM manufacturer chooses to make a representation of 
energy efficiency or energy use. Low-capacity ACIMs are not currently 
subject to DOE testing or energy conservation standards. As such, 
manufacturers would not be required to test low-capacity ACIMs until 
such time as DOE establishes energy conservation standards for such 
equipment. Under the proposed test procedure, were a manufacturer to 
choose to make representations of the energy efficiency or energy use 
of a low-capacity ACIM energy, beginning 360 days after a final rule, 
were DOE to finalize the proposal, manufacturers would be required to 
base such representations on the DOE test procedure. (42 U.S.C. 
6314(d)) DOE is proposing test procedures for low-capacity ACIMs in 
this NOPR.
    Issue 1: DOE requests comment on the proposal to include test 
procedure provisions for low-capacity ACIMs within the scope of the 
ACIM test procedure.
    Issue 2: DOE seeks information on whether there is an industry test 
procedure for testing and rating low-capacity ACIMs. If so, DOE 
requests information on how such a test procedure addresses (or could 
address) the specific features of low-capacity ACIMs that are not 
present in higher-capacity ACIMs, such that the test procedure produces 
results that are representative of an average use cycle.

B. Definitions

    As noted, 10 CFR 431.132 provides definitions concerning ACIMs. DOE 
proposes new definitions to support test procedure amendments proposed 
elsewhere in this document, as discussed in the following paragraphs.
1. Refrigerated Storage ACIM
    Typical self-contained ACIMs have an ice storage bin that is 
insulated but provides no active refrigeration. As a result, the ice 
melts at a certain rate and the ice maker must periodically replenish 
the melted ice. Conversely, some self-contained low-capacity ACIMs 
feature a refrigerated storage bin that prevents melting of the stored 
ice. Because of the additional refrigeration system components, ACIMs 
with a refrigerated storage bin (i.e., refrigerated storage ACIMs) have 
different energy use characteristics than ACIMs without refrigerated 
storage. DOE is proposing amendments specific to refrigerated storage 
ACIMs, as explained in Section III.D.1.b of this NOPR.
    To effectively differentiate refrigerated storage ACIMs from ACIMs 
with unrefrigerated storage bins, and to support the proposed test 
provisions for refrigerated storage ACIMs, DOE proposes to add the 
following definition to 10 CFR 431.132 for refrigerated storage ACIMs:
    A ``refrigerated storage automatic commercial ice maker'' is an 
automatic commercial ice maker that has a refrigeration system that 
actively refrigerates the self-contained storage bin.
    Issue 3: DOE requests comment on the proposed definition for 
refrigerated storage automatic commercial ice maker.
2. Portable ACIM
    Some low-capacity ACIMs are ``portable'' and do not require 
connection to water supply plumbing to operate. Instead, these units 
contain a reservoir that the user manually fills with water prior to 
operation and must refill when it becomes empty. In the December 2014 
MREF Test Procedure NOPR, DOE proposed to define ``portable ice maker'' 
as an ice maker that does not require connection to a water supply and 
instead has one or more reservoirs that would be manually supplied with 
water. 79 FR 74894, 74916. DOE noted that the lack of a fixed water 
connection and the small size of these units contribute to their 
portability. Id. DOE did not receive comments on the proposed 
definition for portable ice makers in response to the December 2014 
MREF Test Procedure NOPR.
    In this NOPR, DOE proposes a definition for portable ice maker as 
proposed in the December 2014 MREF Test Procedure NOPR, but with 
additional specification that ACIMs with an optional connection to a 
water supply line would not be considered portable ACIMs (i.e., a unit 
would be considered portable if the water supplied to the unit is only 
via one or more reservoirs). DOE proposes to add the following 
definition to 10 CFR 431.132 for portable ACIMs:
    ``Portable automatic commercial ice maker'' means an automatic 
commercial ice maker that does not have a means to connect to a water 
supply line and has one or more reservoirs that are manually supplied 
with water.
    Issue 4: DOE requests comment on the proposed definition for 
portable automatic commercial ice maker.
3. Industry Standard Definitions
    In addition to the definitions specified at 10 CFR 431.132, the 
current DOE test procedure at 10 CFR 431.134 references section 3, 
``Definitions'' of AHRI Standard 810-2007, which includes many of the 
same terms DOE defines at 10 CFR 431.132 and 10 CFR 431.134. To avoid 
potential confusion regarding multiple definitions of similar terms, 
DOE is proposing to clarify in 10 CFR 431.134 that where definitions in 
AHRI Standard 810 conflict with those in DOE's regulations, the DOE 
definitions take precedence.
    AHRI Standard 810-2016 updated its definition of ``Energy 
Consumption Rate'' to require expressing the rate in multiples of 0.01 
kWh/100 lb of ice. To maintain consistency with the industry standard, 
DOE is proposing to incorporate this same rounding requirement in its 
definition of ``Energy use'' at 10 CFR 431.132 instead of the current 
requirement of multiples of 0.1 kWh/100 lb of ice.
    AHRI Standard 810-2016 also deleted its definition of ``Cubes Type 
Ice Maker'' and replaced it with a definition of ``Batch Type Ice-
Maker.'' To be consistent with this industry update, DOE is proposing 
to remove the

[[Page 72329]]

reference to cubes type ice maker in the definition of ``Batch type ice 
maker'' in 10 CFR 431.132. DOE is also proposing to remove ``Cube type 
ice'' from the list of DOE definitions at 10 CFR 431.132, consistent 
with the industry standard update.
    Issue 5: DOE requests comment on its proposal to amend 10 CFR 
431.132 to revise the definitions of ``Batch type ice maker'' and 
``Energy Use'' and delete the definition of ``Cube type ice,'' 
consistent with updates to AHRI Standard 810-2016. DOE also requests 
feedback on the proposed clarification that the DOE definitions take 
precedence over any conflicting industry standard definitions.
    The following section discusses additional updates included in the 
latest versions of the industry standards.

C. Industry Test Standards Incorporated by Reference

    The existing DOE ACIM test procedure incorporates by reference AHRI 
Standard 810-2007 and ASHRAE Standard 29-2009. 10 CFR 431.134(b). Since 
publication of the January 2012 final rule, both AHRI and ASHRAE have 
published new versions of the referenced standards. The most recent 
versions are AHRI Standard 810-2016 and ASHRAE Standard 29-2015 
(reaffirmed in 2018). The 2018 reaffirmed version of ASHRAE Standard 
29-2015 has no changes compared to the 2015 version of the standard. 
DOE has reviewed the most recent versions of both AHRI Standard 810 and 
ASHRAE Standard 29 and has compared the updated versions of these 
industry standards to those currently incorporated by reference in the 
ACIM test procedure.
    The updates in ASHRAE Standard 29-2015 provide additional 
specificity to several aspects of the test method. In general, these 
updates increase the precision and improve the repeatability of the 
test method, but do not fundamentally change the testing process, 
conditions, or results. In addition, ASHRAE made several grammatical, 
editorial, and formatting changes to improve the clarity of the test 
method. DOE summarizes these changes in Table III.2.

   Table III.2--Summary of Changes Between ASHRAE Standard 29-2009 and
                         ASHRAE Standard 29-2015
------------------------------------------------------------------------
                               ASHRAE standard 29-   ASHRAE standard 29-
         Requirement                  2009                  2015
------------------------------------------------------------------------
Test Room Operations........  None................  No changes to the
                                                     test room shall be
                                                     made during
                                                     operation of the
                                                     ice maker under
                                                     test that would
                                                     impact the vertical
                                                     ambient temperature
                                                     gradient or the
                                                     ambient air
                                                     movement.
Temperature Measuring         Accuracy of 1.0 [deg]F      resolution of 1.0 [deg]F;
                               <=2.0 [deg]F.         where accuracy
                                                     greater than 1.0 [deg]F,
                                                     the resolution
                                                     shall be at least
                                                     equal to the
                                                     accuracy
                                                     requirement.
Harvest Water Collection....  None................  Harvest water shall
                                                     be captured by a
                                                     non-perforated pan
                                                     located below the
                                                     perforated pan.
Ice Collection Container      ``Perforated pan,     Requirements
 Specification.                bucket, or wire       regarding water
                               basket'' and ``non-   retention weight
                               perforated pan or     and perforation
                               bucket''.             size for perforated
                                                     pans and ``solid
                                                     surface'' for non-
                                                     perforated pan.
Pressure Measuring            None................  Accuracy of and
 Instruments.                                        resolution of 2.0 percent
                                                     of the quantity
                                                     measured.
Sampling Rate...............  None................  Maximum interval
                                                     between data
                                                     samples of 5 sec.
Supply Water Temperature and  1 [deg]F  1 [deg]F
 Pressure.                     (water supply         (water supply
                               temperature).         temperature) and
                                                     ``within 8 in. of
                                                     the ice maker . . .
                                                     within the
                                                     specified range''
                                                     (water pressure)
                                                     during water fill
                                                     interval.
Inlet Air Temperature         Measure a minimum of  Measure at a
 Measurement.                  2 places, centered    location
                               1 ft from the air     geometrically
                               inlet(s).             center to the inlet
                                                     area at a distance
                                                     1 ft from each
                                                     inlet.
Clearances..................  18 inches on all      3 ft or the minimum
                               sides.                clearance allowed
                                                     by the
                                                     manufacturer,
                                                     whichever is
                                                     greater.
Stabilization Criteria......  Three consecutive     Two consecutive 15.0
                               14.4 min samples      min 2.5
                               (continuous) taken    sec samples taken
                               within a 1.5 hr       within 5 mins of
                               period or two         each other within 2
                               consecutive batches   percent or 0.055
                               (batch) do not vary   lbs (continuous) or
                               by more than 2 percent.      ice production rate
                                                     from two
                                                     consecutive batches
                                                     within 2 percent or
                                                     2.2 lb (batch).
Capacity Test Ice Collection  Three consecutive     Specifies that batch
                               14.4 min samples      ice must be weighed
                               (continuous) or       30 2.5
                               batches (batch).      s after collection
                                                     and continuous ice
                                                     samples must be
                                                     within 5 mins of
                                                     each other.
Calorimetry Testing.........  (1) Room temperature  (1) Room temperature
                               is not specified.     shall be within 65-
                                                     75 [deg]F during
                                                     the entire
                                                     procedure.
                              (2) To determine the  (2) To determine the
                               calorimeter           calorimeter
                               constant, 30 lbs of   constant, add a
                               water must be added.  quantity of water 5
                                                     times the mass of
                                                     ice (see #4 below).
                              (3) Rate of stirring  (3) Rate of stirring
                               is described as       is to be 1 0.5
                                                     revolutions/second.
                              (4) To determine the  (4) To determine the
                               calorimeter           calorimeter
                               constant, 6 lbs of    constant, add a
                               ice must be added.    mass of ice between
                                                     50-200% of the
                                                     rated ice
                                                     production for a
                                                     period of 15
                                                     minutes of the ice
                                                     maker to be tested,
                                                     or 6 lbs, whichever
                                                     is less.
                              (5) The block of ice  (5) The block of
                               is seasoned at room   pure ice must reach
                               temperature. A        an equilibrium
                               temperature           temperature
                               measurement           measured by a
                               location is not       thermocouple
                               specified for the     embedded in the
                               block of ice.         interior of the
                                                     block and is free
                                                     of trapped water.
                              (6) To determine the  (6) To determine the
                               calorimeter           calorimeter
                               constant, it is not   constant, continue
                               explicitly stated     stirring after ice
                               to continue           has disappeared for
                               stirring for 15       15 minutes.
                               minutes after the
                               ice has melted.

[[Page 72330]]

 
                              (7) The calorimeter   (7) The calorimeter
                               constant shall be     constant shall be
                               determined twice,     determined, at a
                               at the beginning      minimum, each time
                               and at the end of     the temperature
                               the daily tests.      measuring and
                                                     weighting
                                                     instruments are
                                                     calibrated or if
                                                     there is a change
                                                     to the container or
                                                     stirring apparatus.
                              (8) The calorimeter   (8) The calorimeter
                               constant shall be     constant must be
                               no greater than       within 1.0-1.02.
                               1.02.
                              (9) To determine the  (9) To determine the
                               net cooling effect,   net cooling effect,
                               the water must        stir the water for
                               stand in the          15 minutes prior to
                               calorimeter for 1     the addition of the
                               min before adding     harvested ice.
                               harvested ice.
                              (10) Section 7.2.3    (10) Section 7.2.4
                               specifies that the    specifies that the
                               ice sample used for   ice sample used for
                               calorimetry testing   calorimetry testing
                               shall be              shall be
                               intercepted in a      intercepted using a
                               manner similar to     non-perforated
                               that prescribed in    container,
                               Section 7.2.2         precooled to ice
                               (7.2.2 reads:         temperature, and
                               Record the required   collected from a
                               data (see Section     stabilized ice
                               8).), except that     maker over a time
                               the sample size       period of 15 min or
                               shall be suitable     until 6 lbs has
                               for the test.         been captured.
Recorded Data...............  Specifies 7 discrete  Specifies that
                               elements be           ambient temperature
                               recorded.             gradient (at rest),
                                                     maximum air-
                                                     circulation
                                                     velocity (at rest),
                                                     and water pressure
                                                     must also be
                                                     recorded.
------------------------------------------------------------------------
* AHRI Standard 810-2007 specifies the inlet water pressure of 30.0
  3.0 psig.

    DOE also reviewed the updates to AHRI Standard 810-2016 and 
identified the following revisions: New definitions for, among others, 
ice hardness factor and potable water use rate; and an updated rounding 
requirement for energy consumption rate (from 0.1 kilowatt hours per 
100 pounds (``kWh/100 lb'') to 0.01 kWh/100 lb). The changes to AHRI 
Standard 810-2016 are primarily clerical in nature and provide greater 
consistency in the use of terms and specific definitions for those 
terms.
    In the March 2019 RFI, DOE requested comment on updating the DOE 
test procedure to incorporate by reference the latest industry 
standards--AHRI Standard 810-2016 and ASHRAE Standard 29-2015. 
Additionally, DOE requested comment on the benefits and burdens of 
adopting any industry/voluntary consensus-based or other appropriate 
test procedure.
    Generally, commenters supported incorporating by reference the 
latest industry standards. AHRI commented that incorporating the 
current editions of ASHRAE 29 and AHRI 810 would capture the most 
accurate and repeatable energy usage of ACIM in the marketplace today 
and that the updates to the consensus standards produce accurate 
results without unduly burdensome testing requirements for laboratories 
or manufacturers. (AHRI, No. 5 at p. 2) AHRI stated that testing burden 
is most manageable when industry standards are implemented with 
effective dates that allow manufacturers and testing facilities to 
adjust and upgrade accordingly. (AHRI, No. 5 at p. 9) AHRI also stated 
that the industry committee weighs the potential improvement in testing 
accuracy associated with tightening the tolerances and increasing the 
instrumentation accuracies with the increase in testing burden and 
costs. AHRI commented that the current process identified all of these 
factors when considering each individual change to the standard. (AHRI, 
No. 5 at p. 8)
    Hoshizaki commented in support of updating the test procedure to 
the most recent versions of AHRI 810 and ASHRAE 29 and does not support 
incorporating any additional requirements. (Hoshizaki, No. 4 at p. 1)
    Howe also commented in support of moving forward with the updates 
to both AHRI 810-2016 and ASHRAE Standard 29-2015 to their current 
released versions with changes as outlined in the March 2019 RFI, 
stating that the updates to the standard will improve the accuracy of 
the energy testing and will not increase testing burden. Howe also 
warned that compulsory adoptions of revisions to AHRI and ASHRAE 
standards could potentially favor the interests of the corporations 
involved in the industry revisions process. Howe stated that confirming 
any test procedure changes in DOE's rulemaking would ensure that all 
ACIM manufacturers have an opportunity to participate in the adoption 
of those changes. (Howe, No. 6 at p. 3)
    DOE also compared the latest version of ASHRAE Standard 29-2015 to 
the requirements in the current DOE test procedure in 10 CFR 431.134. 
These test methods specify different conditions for calorimetry testing 
of continuous ice makers. Specifically, the current DOE test procedure 
requires an ambient air temperature of 70 1 [deg]F, with an 
initial water temperature of 90 1 [deg]F. 10 CFR 
431.134(b)(2)(ii). ASHRAE Standard 29-2015 states in Appendix A3 that 
room temperature shall be kept between 65 [deg]F and 75 [deg]F, and 
that the water temperature is 20 [deg]F 1 [deg]F above room 
temperature.
    In the March 2019 RFI, DOE also noted that third-party test 
laboratories have had difficulty achieving the calorimeter constant 
value as specified in ASHRAE Standard 29-2009 (i.e., no greater than 
1.02, and therefore also the requirements in ASHRAE Standard 29-2015, 
in the range of 1.00 to 1.02), and that amended instructions regarding 
the calorimeter constant may reduce testing burden while maintaining 
the accuracy of the test procedure. 84 FR 9979, 9982.
    In response to the March 2019 RFI, Hoshizaki commented that the 
method used in ASHRAE Standard 29-2015 to determine the calorimeter 
constant is labor intensive but repeatable. (Hoshizaki, No. 4 at p. 1) 
AHRI and Howe commented that manufacturers and third-party laboratories 
that are currently testing in accordance with the updated industry 
standard have been able to achieve repeatable results and have not seen 
variance outside of the allowable range when using the updated industry 
testing methods. (AHRI, No. 5 at p. 3; Howe, No. 6 at p. 3) Howe also 
opposed increasing the range of acceptable values for the calorimeter 
constant for ASHRAE Standard 29-2015, stating that the calorimeter 
constant has a direct relationship with the calculation of the ice 
hardness from the net cooling effect test, and increasing the range of 
acceptable values can result in inaccurate ice

[[Page 72331]]

hardness adjustment factors that will be applied to energy and 
condenser water use, which would add significant uncertainty that 
should be avoided. (Howe, No. 6 at p. 3)
    Brema commented that DOE should define a common tool for 
calorimetric verification to be performed as a preliminary check, 
before beginning the energy consumption test. (Brema, No. 3 at p. 2) 
Howe commented that DOE should discuss requiring a specific container 
that is verified by third-party laboratories for calorimeter testing to 
aid in consistency between testing facilities. (Howe, No. 6 at p. 3)
    Howe noted that ice hardness values above 100 percent are possible 
if ice produced by an ice maker is sensibly cooled after the phase 
change is complete, and that in ASHRAE Standard 29-2015, for example, 
this would show a ``latent heat'' capacity above 144 Btu/lb because 
there is not a calculation showing the sensible heat removed to sub-
cool the ice below its fusion temperature. (Howe, No. 6 at p. 4)
    DOE has tentatively determined that the current ambient and water 
condition requirements for calorimetry testing in the DOE test 
procedure are appropriate because they provide more precise and 
repeatable measurements than the tolerances described in ASHRAE 
Standard 29-2015. Additionally, manufacturers have been meeting the 
requirements to maintain 70 [deg]F 1 [deg]F ambient air 
temperature and 90 [deg]F 1 [deg]F initial water 
temperature for calorimetry testing as part of the current DOE test 
procedure in 10 CFR 431.134. The current DOE test approach also is 
consistent with the industry test standard requirements, i.e., a test 
performed at the DOE required temperature conditions meets the 
temperature conditions specified in ASHRAE Standard 29-2015. Therefore, 
DOE is not proposing to amend the 70 [deg]F 1 [deg]F 
ambient air temperature and 90 [deg]F 1 [deg]F initial 
water temperature requirements for calorimetry testing. DOE is 
proposing to explicitly provide that the harvested ice used to 
determine the ice hardness factor be produced at the Standard Rating 
Conditions specified in Section 5.2.1 of AHRI Standard 810-2016. These 
conditions are provided in the industry standard, indicating that they 
are currently used by manufacturers and therefore this clarification 
would not change how manufacturers test. In response to Howe's comment, 
this proposed approach accounts for the ice quality and corresponding 
cooling effect for any ice samples, including those that may be sub-
cooled below 32 [deg]F.
    Additionally, added specificity may be needed to accurately 
determine the calorimeter constant. DOE has found that the lack of 
specificity as to the location of the temperature measurement of the 
block of pure ice may lead to variation in the resulting calorimeter 
constant. Therefore, DOE is proposing to specify that the block of pure 
ice, as specified in Section A2.e of ASHRAE Standard 29-2015, is 
measured by a thermocouple embedded at approximately the geometric 
center of the interior of the block. Furthermore, DOE is proposing to 
specify that any liquid water present on the block of ice must be wiped 
off the surface of the block before placing the block into the 
calorimeter.
    In response to the March 2019 RFI comments, DOE is not proposing to 
define specific test equipment for the calorimeter to allow 
laboratories the flexibility to use available equipment and to avoid 
the potential lack of availability of specific test equipment.
    In this NOPR, DOE is proposing to adopt by reference AHRI Standard 
810-2016 and ASHRAE Standard 29-2015 (note that AHRI Standard 810-2016 
refers to ASHRAE Standard 29-2015 and not the 2018 re-affirmed version) 
as the basis for DOE's ACIM test procedure, with additional proposed 
provisions for calorimetry testing as discussed previously in this 
section and the additional proposed provisions discussed in the later 
sections of this NOPR.
    As noted earlier in this section, the updates in ASHRAE Standard 
29-2015 provide additional specificity to several aspects of the test 
method. In general, these updates increase the precision and improve 
the repeatability of the test method, but do not fundamentally change 
the testing process, conditions, or results. Additionally, the changes 
to AHRI Standard 810-2016 are primarily clerical in nature and provide 
greater consistency in the use of terms and specific definitions for 
those terms. Accordingly, DOE does not expect that the proposed 
references to the updated industry standards would result in changes to 
measured performance as compared to the existing test procedure.
    Issue 6: DOE requests comment on its proposal to maintain the 
current specifications of 70 [deg]F 1 [deg]F ambient air 
temperature and 90 [deg]F 1 [deg]F initial water 
temperature for calorimetry testing. DOE also requests comment on its 
proposal to clarify that the harvested ice used to determine the ice 
hardness factor be collected from the ACIM under test at the Standard 
Rating Conditions specified in Section 5.2.1 of AHRI Standard 810-2016.
    Issue 7: DOE requests comment on its proposal to clarify that the 
temperature of the block of pure ice, as specified in Section A2.e. of 
ASHRAE Standard 29-2015, is measured by a thermocouple embedded at 
approximately the geometric center of the interior of the block. DOE 
also requests comment on its proposal to clarify that any water that 
remains on the block of ice must be wiped off the surface of the block 
before placing the ice into the calorimeter.
    Issue 8: DOE requests comment on its proposal to adopt by reference 
AHRI Standard 810-2016 and ASHRAE Standard 29-2015, except for the 
provisions for calorimetry testing as discussed previously, for all 
ACIMs.

D. Additional Proposed Amendments

    DOE conducted testing to identify whether ASHRAE Standard 29-2015 
and AHRI Standard 810-2016 could potentially benefit from additional 
detail and to investigate topics discussed in the March 2019 RFI. The 
testing and initial findings are discussed along with any corresponding 
proposed amendments in the following sections.
1. Low-Capacity ACIMs
    DOE examined the comments received in response to the December 2014 
MREF TP NOPR to consider what test method would be appropriate for low-
capacity ACIMs. During the December 2014 MREF TP NOPR public meeting, 
True Manufacturing commented that there are very few differences 
between ice makers with harvest rates less than 50 lb/24 h and those 
with harvest rates greater than 50 lb/24 h. (Public Meeting Transcript, 
No. EERE-2013-BT-TP-0029-0014 at p. 31) Hoshizaki commented in response 
to the December 2014 MREF TP NOPR that the ASHRAE 29 test needs to be 
evaluated for accuracy for units that make less than 50 lb/24 h, as 
they are outside the listed scope of the standard. (Hoshizaki, No. 
EERE-2013-BT-TP-0029-0011 at p. 1)
    DOE evaluated the provisions in its existing ACIM test procedure to 
determine if any modifications are necessary to ensure the proposed 
test method would provide representative and repeatable measures of 
performance for low-capacity ACIMs and would not be unduly burdensome 
to conduct. DOE also evaluated the provisions in AHRI Standard 810-2016 
and ASHRAE Standard 29-2015 to determine their applicability to low-
capacity ACIMs.
    During investigative testing of batch type low-capacity ACIMs, DOE 
observed that the ice collection container requirements in section 
5.5.2(a) of ASHRAE Standard 29-2015 may not be

[[Page 72332]]

appropriate for this equipment. Section 5.5.2(a) requires that the 
collection container have a water retention weight that is no more than 
1.0 percent of that of the smallest batch of ice for which the 
container is used. For low-capacity batch type ACIMs, the weight of ice 
in each batch is significantly lower than for other higher capacity 
ACIMs. Accordingly, 1.0 percent of an individual batch represents a 
very small weight for low-capacity ACIMs. For example, one such low-
capacity ACIM has a typical batch weight of 0.087 pounds; 1.0 percent 
of that would be 0.00087 pounds, the equivalent of 0.080 teaspoons of 
water. The water retention weight of a typical very small collection 
container is approximately 0.0030 pounds. DOE was not able to identify 
collection containers that would meet this threshold for the low-
capacity ACIMs with the lowest batch weights.
    From its test sample, DOE determined that a water retention weight 
of no more than 4.0 percent would allow for testing low-capacity ACIMs 
with the lowest batch weights with a typical collection container. 
Accordingly, DOE is proposing that the water retention requirement in 
section 5.5.2(a) not apply to batch type low-capacity ACIMs, and 
instead to require a water retention weight of no more than 4.0 percent 
of the smallest batch of ice for which the container is used.
a. Portable ACIMs
    For portable ACIMs, DOE has initially determined that some 
provisions for measuring and maintaining inlet water conditions in 
ASHRAE Standard 29-2015 are not appropriate: i.e., sections 5.4, 5.6, 
6.2 and 6.3. These sections include instrument specifications, test 
conditions, and measurement instructions regarding inlet water flow, 
pressure, and temperature. These sections are not applicable to 
portable ACIMs because such equipment do not have a fixed water 
connection, and therefore the conditions in these sections would not 
provide representative conditions for portable ACIMs. Portable ACIMs 
instead require that the fill reservoir be manually filled with a 
maximum volume of water that is recommended by the manufacturer.
    To determine typical operation and the corresponding need for 
additional test procedure instructions regarding the water supply for 
portable ACIMs, DOE conducted tests on portable ACIMs according to the 
requirements of AHRI Standard 810-2016 and ASHRAE Standard 29-2015, 
except for sections 5.4, 5.6, 6.2, and 6.3 of ASHRAE Standard 29-2015. 
From this testing, DOE has initially determined that additional 
instructions are needed regarding supply water characteristics and 
filling the water reservoirs in portable ACIMs.
    Section 5.2.1 of AHRI 810-2016 specifies an inlet water temperature 
of 70.0 [deg]F for ACIM testing. Because portable ACIMs do not have a 
continuous water supply, the water filled in the water reservoir is not 
maintained at a constant temperature; the temperature may change after 
the initial fill based on heat transfer with the ambient air and the 
other components of the ACIM. Accordingly, DOE has initially determined 
that specifying only the initial fill temperature of the water supplied 
to the reservoir is most representative of typical use. DOE proposes to 
establish the initial water temperature in a separate external 
container before transferring the water to the water reservoir. In 
DOE's experience, using an external container to establish and verify 
the initial water temperature is significantly less burdensome than 
measuring and adjusting the water temperature within the water 
reservoir itself. Therefore, DOE proposes that the initial water 
temperature condition be established in an external container and 
verified by inserting a temperature sensor into approximately the 
geometric center of the water in the external container. The initial 
water temperature would be defined as 70 [deg]F 1.0 [deg]F, 
consistent with the condition as specified in section 5.2.1 of AHRI 
Standard 810-2016 and the tolerance as specified in section 6.2 of 
ASHRAE Standard 29-2015.
    Portable ACIM users may have an option of filling the reservoirs to 
varying levels. To determine the appropriate fill level for testing, 
DOE reviewed operating instructions for portable ACIMs available from a 
range of manufacturers. DOE observed that the operating instructions 
typically instruct the user to fill to the maximum specified level, or 
to any level up to the maximum. To ensure repeatable and reproducible 
test results, DOE has initially determined that filling the water 
reservoir to the maximum volume of water as specified by the 
manufacturer is representative of typical use. In addition, specifying 
a consistent fill level for testing at the maximum fill level would 
limit variability associated with reservoir water temperature and would 
ensure the portable ACIM has sufficient water to conduct the test.
    In summary, DOE proposes that portable ACIMs be subject to the test 
procedure as proposed in this NOPR, except that sections 5.4, 5.6, 6.2, 
and 6.3 of ASHRAE Standard 29-2015 would not apply. DOE proposes to 
provide the following additional test instructions necessary for 
testing portable ACIMs: Ensure that the ice storage bin is empty; fill 
an external container with water; establish a water temperature in the 
external container is consistent with the requirements of section 5.2.1 
of AHRI Standard 810-2016 and the tolerance specified in section 6.2 of 
ASHRAE Standard 29-2015 (i.e., 70 [deg]F 1.0 [deg]F); 
verify the water temperature in the external container by inserting a 
temperature sensor into approximately the geometric center of the 
water; after establishing water temperature, immediately transfer the 
water to the portable ACIM reservoir and fill the reservoir to the 
maximum level as specified by the manufacturer.
    Issue 9: DOE requests comment on its proposal that portable ACIMs 
be subject to the test procedure as proposed in this NOPR, except that 
sections 5.4, 5.6, 6.2, and 6.3 of ASHRAE Standard 29-2015 do not 
apply. DOE requests comment on its proposal that the potable water 
reservoir be filled to the maximum level of potable water as recommend 
by the manufacturer with an initial water temperature of 70 [deg]F 
1.0 [deg]F. DOE requests comment on its proposal that the 
initial water temperature be established in an external container and 
verified by inserting a temperature sensor into approximately the 
geometric center of the water in the external container.
    DOE has also initially determined that additional instructions are 
needed for portable ACIMs to meet the requirements of section 6.6 of 
ASHRAE Standard 29-2015, which requires that ``bins shall be used when 
testing and shall be filled one-half full with ice.'' Because section 
6.6 of ASHRAE Standard 29-2015 does not specify how the bin would be 
filled with ice, a laboratory may fill the ice storage bin one-half 
full of externally produced ice (i.e., ice that was made by a separate 
ACIM), for example to avoid waiting for the unit under test to produce 
enough ice to fill the bin one-half full prior to initiating the start 
of the test. Using externally produced ice does not directly affect the 
performance of a non-portable ACIM because the conditions within the 
ice storage bin do not have a direct impact on the incoming potable 
water temperature.
    In contrast, the conditions within the ice storage bin of a 
portable ACIM do directly impact performance because portable ACIMs 
typically recycle the melt water (at 32 degrees) from the internal ice 
storage bin and combine it with water from the reservoir (initially at 
70 degrees) to make additional ice.

[[Page 72333]]

Accordingly, any externally produced ice introduced to a portable ACIM 
to fill the bin one-half full prior to testing could affect the 
performance of the system during the test when compared to the tested 
performance using ice produced by the portable ACIM under test.
    To limit test variability that could occur due to the introduction 
of externally produced ice, DOE proposes that for portable ACIMs, the 
ice storage bin must be empty prior to the initial water fill, and the 
unit under test must be operated to produce ice into the ice storage 
bin until the bin is one-half full (i.e., precluding the use of 
externally produced ice to fill the bin one-half full prior to 
testing). DOE proposes to define one-half full as half of the vertical 
dimension of the storage bin, based on the maximum possible fill level. 
Once the ice storage bin is one-half full of ice, testing would proceed 
according to section 7 of ASHRAE Standard 29-2015, consistent with non-
portable ACIM testing.
    Issue 10: DOE requests comment on its proposal that portable ACIMs 
have the ice storage bin empty prior to the initial reservoir fill and 
then produce ice into the ice storage bin until the bin is one-half 
full, at which point testing would proceed according to section 7 of 
ASHRAE Standard 29-2015. DOE requests comment on its proposal to define 
one-half full as half of the vertical dimension of the storage bin 
based on the maximum ice fill level within the storage bin.
b. Refrigerated Storage ACIMs
    DOE has initially determined that refrigerated storage ACIMs can be 
tested according to the current DOE ACIM test procedure as well as AHRI 
Standard 810-2016 and ASHRAE Standard 29-2015. DOE investigated whether 
additional specification was necessary to ensure that these test 
methods would provide representative and repeatable results for 
refrigerated storage ACIMs and would not be unduly burdensome to 
conduct.
    DOE identified two aspects of refrigerated storage ACIM testing 
that may need further specification to limit variability: Door openings 
for refrigerated storage ACIMs and refrigeration set point controls.
    Door opening durations may affect the measured performance of 
refrigerated storage ACIMs more than non-refrigerated storage ACIMs 
because the refrigeration system provides cooling for the entire self-
contained storage bin rather than only for the ice making evaporator. 
Thus, when opening the storage container door to collect ice from 
refrigerated storage ACIMs, some portion of cold air from the storage 
container will likely be replaced by higher temperature ambient air. 
Both the duration and the extent of the door opening can contribute to 
this air exchange within the storage container. Therefore, specifying 
the duration and the extent of the door opening would limit variability 
from test to test, thus promoting repeatable and reproducible test 
results.
    From investigative testing, DOE has determined that the process of 
opening the bin door, carefully removing or replacing the ice 
collection container, and closing the door can be readily performed in 
under 10 seconds. DOE therefore proposes that for refrigerated storage 
ACIMs, any storage bin door openings shall be conducted with the door 
in the fully open position for 10 1 seconds. DOE proposes 
to specify that ``fully open'' means opened to an angle of not less 
than 75 degrees (or to the maximum angle possible, if that is less than 
75 degrees), which is consistent with the definition for fully open in 
ANSI/ASHRAE Standard 72-2018, ``Method of Testing Open and Closed 
Commercial Refrigerators and Freezers.'' To ensure a consistent number 
of door openings, DOE also proposes to specify that door openings would 
occur only when collecting the ice sample and when returning the empty 
collection container to the ice storage compartment (i.e., two separate 
door openings per sample collection).
    Issue 11: DOE requests comment on its proposal to specify that door 
openings must only occur on self-contained refrigerated storage ACIMs 
to collect samples after each cycle, and that the door shall be in the 
fully open position for 10.0 1.0 seconds to collect the 
sample. DOE also requests comment on its proposal to specify that 
``fully open'' means opening a door to an angle of not less than 75 
degrees.
    Refrigeration set point controls may also affect the measured 
performance of refrigerated storage ACIMs, if the controls can be 
adjusted by the user to maintain different storage compartment 
temperatures. DOE investigated whether refrigerated storage ACIMs allow 
the user to adjust the refrigeration set point of the ACIM and if so, 
how. DOE reviewed user manuals for several refrigerated storage ACIMs 
and found that the models either do not allow the user to adjust the 
refrigeration set point, or have a factory preset temperature control 
that can be adjusted by the user, but not in an easily accessible 
manner (e.g., temperature control screws adjustable only with a 
screwdriver or accessible behind grilles). The ability to adjust the 
refrigeration set point on some refrigerated storage ACIMs does not 
appear to be a setting that users would typically adjust and is likely 
used only for troubleshooting. Based on this information, DOE proposes 
that the refrigeration set point for testing a refrigerated storage 
ACIM be consistent with section 4.1.4 of AHRI Standard 810-2016 (i.e., 
per the manufacturer's written instructions with no adjustment prior to 
or during the test).
    Issue 12: DOE requests comment on its proposal to test refrigerated 
storage ACIMs consistent with section 4.1.4 of AHRI Standard 810-2016 
(i.e., with adjustable temperature settings tested per the 
manufacturer's written instructions with no adjustment prior to or 
during the test). DOE requests comment on whether a specific 
refrigeration set point or internal air temperature should be specified 
for testing instead of the manufacturer's factory preset refrigeration 
set point.
2. Stability Criteria
    The current DOE test procedure, through reference to section 7.1.1 
of ASHRAE Standard 29-2009, defines ACIM stability based on the harvest 
rate. Specifically, continuous-type ice makers shall be considered 
stabilized when the weights of three consecutive 14.4-minute samples 
taken within a 1.5-hour period do not vary by more than 2 
percent. Batch type ice makers are considered stable when the weights 
from the samples from two consecutive cycles do not vary by more than 
2 percent.
    Section 7.1.1 of ASHRAE Standard 29-2015 revised the stabilization 
criteria to consider continuous-type ice makers stable when the weights 
of two consecutive 15.0 minute 2.5 seconds samples do not 
vary by more than the greater of 2 percent, or 0.055 
pounds. Section 7.1.1. of ASHRAE Standard 29-2015 specifies that batch 
type ice makers are considered stable when the 24-hour calculated ice 
production rate from samples taken from two consecutive cycles do not 
vary by the greater of 2 percent or 2.2 pounds. Compared to 
the 2009 version, ASHRAE Standard 29-2015 added absolute stability 
criteria of 0.055 lb/15 minutes for continuous equipment and 2.2 lb/24 
h for batch equipment.
    In addition, ASHRAE Standard 29-2009 states that the unit must be 
stable before the capacity tests are started. This provision was 
changed in ASHRAE Standard 29-2015, which instead states that the ice 
maker must be stable for capacity test data to be valid. In 
application, the stability provision in ASHRAE Standard 29-2009 means 
that

[[Page 72334]]

any cycle or sample after the stability criteria is met is valid to be 
used for the capacity test. DOE notes that the applicability of the 
stability criteria in ASHRAE Standard 29-2015 could be understood in 
one of two ways: (1) Unchanged from ASHRAE Standard 29-2009, meaning 
that any cycle or sample after the stability criteria are met is valid 
to be used for the capacity test; or (2) the ice production rate for 
each cycle used for the capacity test relative to any other cycle or 
sample used for the capacity test must be within the greater of 2 percent and 2.2 lb/24 h for batch type ice makers, and each 
sample used for the capacity test must be within the greater of 2 percent and 0.055 lb/15 mins for continuous ice makers. The 
second interpretation limits potential variability compared to the 
first interpretation because it puts specific limits on the variability 
between cycles and samples to be used for the capacity tests. The 
difference in the potential interpretations of the stability provisions 
in ASHRAE Standard 29-2015 could result in variation in capacity 
ratings. Additionally, the second interpretation limits test burden by 
not requiring separate cycles for meeting the stability criteria and 
for testing performance. Under the second interpretation, the same 
cycles are used to determine stability and performance. In this NOPR, 
DOE proposes to expressly provide that the second interpretation be 
used for determining stability, such that all cycles or samples used 
for the capacity test are stable. DOE does not expect that this 
proposal would impact ACIM performance as measured under the existing 
test procedure as it would not substantively change the cycles required 
for evaluating performance.
    Section 7.1.1 of ASHRAE Standard 29-2015 added a requirement that 
the duration of each sample for continuous type ice makers be 15.0 
minutes 2.5 seconds. DOE testing indicated that removing 
the plastic pan or bucket within the tolerance of 2.5 
seconds can be difficult depending on the specific test setup (e.g., 
removing the container from the ice maker or bin without spilling ice). 
An increased tolerance would reduce burden on manufacturers to test 
continuous ice makers, while still sufficiently limiting the 
variability between samples used for the capacity test to the criteria 
proposed.
    Therefore, DOE proposes to increase the tolerance to collect 
samples for continuous ice makers from 15.0 minutes 2.5 
seconds to 15.0 minutes 9.0 seconds. Increasing the 
tolerance to 9.0 seconds could affect the weight of each sample; 
however, variability would not increase because the samples used for 
the capacity test would still need to meet the proposed stability 
criteria. With the 9-second tolerance, the maximum and minimum 
allowable collection times would vary by approximately 2 percent, which 
is consistent with the allowable variation in capacity to determine 
stability. DOE expects that this proposal would reduce the test burden 
compared to the ASHRAE Standard 29-2015 approach and would ensure that 
valid samples can be obtained. Additionally, DOE does not expect that 
this proposal would affect measured performance as compared to the 
existing test procedure because the sample collection period as 
proposed is not substantively different from the existing test 
procedure approach.
    Issue 13: DOE requests comment on its interpretation of Section 
7.1.1 of ASHRAE Standard 29-2015 and proposal to require that all 
cycles or samples used for the capacity test meet the stability 
criteria.
    Issue 14: DOE requests comment on the proposal to increase the 
tolerance for continuous ice makers to collect samples from 15.0 
minutes 2.5 seconds to 15.0 minutes 9.0 
seconds.
    Section 7.1.1 of ASHRAE 29-2015 includes stabilization 
requirements, which specify: (1) For continuous ACIMs, collected 
weights must not vary by more than 2 percent or 25 g (0.055 
lb), whichever is greater; or (2) for batch ACIMs, the calculated 24-
hour ice production rates must not vary by more than 2 
percent or 1 kg (2.2 lb), whichever is greater.
    Based on investigative testing, DOE observed that the absolute 
stability criteria of 2.2 lb/24 h for batch type ice makers would not 
necessarily represent stable operation for low-capacity batch ACIMs. 
DOE conducted a market assessment and observed batch low-capacity ACIMs 
with harvest rates as low as 7 lb/24 h. Based on this harvest rate of 7 
lb/24 h, a 2.2 lb/24 h stability criteria could result in a harvest 
rate variation of up to 31 percent (i.e., 2.2 lb/24 h divided by 7 lb/
24 h). Because of the potential high variability in the stability 
criteria for low-capacity ACIMs, DOE proposes to not apply the absolute 
stability criteria specified in ASHRAE 29-2015 to the proposed test 
procedure for low-capacity ACIMs.
    DOE also considered whether applying only the 2 percent 
stability criterion would be appropriate for low-capacity ACIMs. Due to 
the lower overall ice harvest rates, a 2 percent stability requirement 
represents much smaller weight variations for low-capacity ACIMs. For 
example, a 2 percent stability requirement for the 7 lb/24 h model 
represents a variation of 0.14 lb/24 h, which may be difficult to 
achieve for low-capacity ACIMs.
    The 2 percent stability requirement is also not currently 
applicable to the lowest capacity ACIMs currently in scope for the DOE 
test procedure (as described, the requirement is 2 percent or 2.2 lb/24 
h, whichever is greater). Accordingly, the effective stability 
requirement for the lowest capacity ACIMs currently in scope is 
approximately 4 percent (i.e., 2.2 lb/24 h divided by 50 lb/24 h). DOE 
has initially determined that applying this same percentage (i.e., 4 
percent) as the low-capacity ACIM stability requirement would be more 
appropriate than applying either the 2 percent or 2.2 lb/24 h stability 
requirements currently defined in Section 7.1.1 of ASHRAE 29-2015. DOE 
has observed through testing that low-capacity ACIMs are able to 
achieve stability based on a 4 percent requirement.
    Therefore, for consistency (on a percentage basis) with the 
existing test requirements for small ACIMs currently in scope and to 
limit test burden, DOE proposes to require a 4 percent 
stability criterion (without an absolute stability criterion) for 
testing low-capacity ACIMs.
    Issue 15: DOE requests comment on the proposal to require that all 
cycles or samples of low-capacity ACIMs used for the capacity test meet 
a 4 percent stability criterion and not be subject to an 
absolute stability criterion.
3. Test Conditions
    In the March 2019 RFI, DOE requested comment on potential 
modifications to the existing standard test conditions, and whether any 
modifications would improve the accuracy of the test procedure or 
reduce testing burden. 84 FR 9979, 9984.
    Hoshizaki commented that tightening the tolerances for testing 
would place an undue burden on manufacturers, pointing out that if the 
tolerance is tightened outside of the manufacturer's existing 
equipment, it would entail buying new equipment and introduce higher 
calibration costs for such equipment. (Hoshizaki, No. 4 at p. 2) Howe 
stated that because equipment is readily available to achieve tighter 
tolerances, this change would not place an undue burden on 
manufacturers or third-party testing sites. (Howe, No. 6 at p. 13)
    DOE discusses the potential changes to test conditions, including 
tolerances and instrumentation accuracies, in the following sections.

[[Page 72335]]

a. Relative Humidity
    Variation in the moisture content of ambient air may affect the 
energy consumption of ice makers. However, neither the current DOE test 
procedure, nor AHRI 810-2016 or ASHRAE Standard 29-2015 include 
requirements to control for moisture content for testing. In contrast, 
industry test standards for other refrigeration equipment, such as 
commercial refrigerators, freezers and refrigerator-freezers (``CRE'') 
and refrigerated bottled or canned beverage vending machines 
(``BVMs''), have requirements for the moisture content.
    In the March 2019 RFI, DOE requested comment on how moisture 
content of ambient air impacts ACIM performance. 84 FR 9979, 9984. In 
addition, DOE requested information regarding the burden of specifying 
a humidity range during testing. Id.
    AHRI, Howe, and Hoshizaki stated that specifying a set humidity for 
testing would show a negligible effect for energy testing in ice 
makers, as the physics of an ice maker naturally involve the machine 
performing in a humid atmosphere for the freezing and harvesting of 
ice. (AHRI, No. 5 at p. 5; Howe, No. 6 at p. 9; Hoshizaki, No. 4 at p. 
2) Hoshizaki commented that any discussion of humidity or temperatures 
for testing of ice makers should be handled through the ASHRAE 29 
standard committee. (Hoshizaki, No. 4 at p. 2)
    The Joint Commenters noted that test procedures for other 
refrigeration equipment specify standard conditions for relative 
humidity and wet bulb temperature, and that including these 
specifications would improve the repeatability and reproducibility of 
the test procedure by ensuring that similar conditions are being used 
across test laboratories. Furthermore, the Joint Commenters stated that 
specifying these standard conditions would prevent manufacturers from 
testing at conditions that may improve ratings but not be 
representative of typical field performance. (Joint Commenters, No. 2 
at p. 3)
    DOE tested three ACIMs in a test chamber with relative humidity at 
35, 55 and 75 percent at the standard rating conditions to investigate 
the effect of relative humidity on energy use. Table III.3 summarizes 
the results of this testing.

                               Table III.3--Comparison of Energy Use Rates at Different Relative Humidity Test Conditions
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                      Difference  from  Difference  from
                                                      35% relative                                    75% relative       35% relative      35% relative
         Test unit                   Type            humidity  (kWh/  55% relative  humidity  (kWh/  humidity  (kWh/  humidity to  55%  humidity to  75%
                                                         100 lb)                 100 lb)                 100 lb)           relative          relative
                                                                                                                        humidity  (%)     humidity  (%)
--------------------------------------------------------------------------------------------------------------------------------------------------------
1.........................  Batch.................              8.27  8.28........................              8.28              +0.2              +0.2
2.........................  Batch.................              8.47  10.49.......................             11.47               +24               +35
3.........................  Continuous............              4.27  Not Tested..................              4.43               N/A                +4
--------------------------------------------------------------------------------------------------------------------------------------------------------

    These results show a wide range of impacts on performance among the 
three tested units when relative humidity is varied. Test Unit 1 showed 
little impact in performance between the two relative humidity test 
conditions. Whereas, Test Unit 2 showed the greatest variation in 
performance, with the 55 percent relative humidity test condition 
resulting in 24 percent greater energy use than the 35 percent relative 
humidity test condition. Test Unit 3 showed a modest increase in energy 
use of 4 percent between the 35 percent and 75 percent relative 
humidity conditions. (Test Unit 3 was not tested at the 55 percent 
relative humidity condition). DOE has been unable to determine why Test 
Unit 2 showed significantly greater variation in performance compared 
to the other test units. Nevertheless, based on these results showing 
that different relative humidity conditions can result in a wide 
variation in performance, DOE proposes to specify a relative humidity 
test condition to ensure repeatable and reproducible test results.
    DOE investigated what relative humidity condition would be most 
appropriate for testing ACIMs. Due to a lack of data regarding typical 
relative humidity levels for ACIM installations, DOE considered 
relative humidity conditions used for testing other types of commercial 
kitchen equipment, such as commercial refrigeration equipment 
(``CRE''), refrigerated bottled or canned beverage vending machines 
(``BVMs''), and refrigerated buffet and preparation tables.
    The industry test standard for CRE has a requirement to maintain 
wet-bulb temperature, and the industry test standard for BVM requires 
that relative humidity be controlled. The relative humidity 
requirements in the industry standards for CRE and BVM are codified in 
the current DOE test procedures in Appendix B to Subpart C of 10 CFR 
431 and Appendix B to Subpart Q of 10 CFR 431, respectively. ASTM 
Standard F2143-2016, ``Performance of Refrigerated Buffet and 
Preparation Tables,'' also includes relative humidity requirements. 
Based on a review of the test conditions for these other types of 
commercial food service equipment, DOE is proposing to require a 
relative humidity of 35 percent for ACIM testing, as discussed further 
in the following paragraphs. DOE summarizes the other commercial food 
service equipment test condition requirements along with the proposal 
for ACIMs in Table III.4.

                                              Table III.4--Comparison of Relative Humidity Test Conditions
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                           Corresponding
                                                                                     Ambient                                 Relative        moisture
           Equipment type                           Test standard                  temperature     Wet bulb temperature      humidity      content  (lbs
                                                                                    ([deg]F)             ([deg]F)            (percent)     water vapor/
                                                                                                                                           lbs dry air)
--------------------------------------------------------------------------------------------------------------------------------------------------------
Commercial Refrigeration Equipment..  ASHRAE 72-2005 [dagger]..................            75.2  64.4...................            * 55           0.010
Refrigerated Beverage Vending         ASHRAE 32.1-2010 [dagger]................              75  No requirement.........              45           0.008
 Machines.
Refrigerated Buffet and Preparation   ASTM Standard F2143-2016.................              86  No requirement.........              35           0.009
 Tables.

[[Page 72336]]

 
Automatic Commercial Ice Makers.....  Proposed.................................              90  No requirement.........           ** 35           0.011
--------------------------------------------------------------------------------------------------------------------------------------------------------
* The relative humidity for commercial refrigeration equipment is calculated from the dry bulb temperature and the wet bulb temperature using a pressure
  of 760 mm of mercury.
** Proposed test condition.
[dagger] The test conditions currently incorporated by refence in the DOE test procedures are unchanged in the most recent versions of the industry
  standards, ASHRAE 72-2018 and ASHRAE 32.1-2017.

    DOE has initially determined that establishing a relative humidity 
test condition at 35 percent would be appropriate for testing ACIMs. A 
relative humidity of 35 percent would maintain a moisture content 
similar to the moisture content required in the current DOE test 
procedures for BVMs and CRE, and the industry test standard for 
refrigerated buffet and preparation tables. Controlling to 35 percent 
relative humidity would also limit potential test burden on any ACIM 
manufacturers that already test and control conditions for the other 
refrigerated equipment types. DOE is proposing that the relative 
humidity be maintained and measured at the same location used to 
confirm ambient dry bulb temperature, or as close as the test setup 
permits.
    DOE also investigated appropriate tolerances on relative humidity. 
DOE measured and controlled the relative humidity in the test chamber 
for all tests. DOE observed that relative humidity in the test chamber 
can vary from the set point during ACIM testing. The largest variation 
in relative humidity observed in the test chamber, typically by three 
percentage points, occurred when a self-contained unit was opened to 
remove and measure the weight of the ice. When the unit was closed, the 
relative humidity in the test chamber returned to the set level.
    DOE considered a test condition tolerance and test operating 
tolerance on relative humidity. A test condition tolerance is a 
tolerance that is calculated based on the average of all relative 
humidity measurements during each freeze cycle. In contrast, a test 
operating tolerance would apply to all individual measurement during 
each cycle. The industry standards referenced in Table III.4, ASHRAE 
72-2018, ASHRAE 32.1-2017, and ASTM Standard F2143-2016, all require a 
test condition tolerance. ASHRAE 72-2018 is the only standard mentioned 
in Table III.4 that also requires a test operating tolerance. To be 
consistent with the other commercial food service equipment standards, 
DOE proposes to add a test condition tolerance on the proposed relative 
humidity test condition of 35 percent.
    To establish an appropriate test condition tolerance on relative 
humidity, DOE first investigated typical accuracies of relative 
humidity sensors. Accuracies of 2.0 percent are typical for 
relative humidity sensors. Additionally, DOE's test procedure for BVMs 
requires a relative humidity instrument accuracy of 2.0 
percent. See section 1.1 of Appendix B to subpart Q of 10 CFR 431. 
Similarly, section 6.3 of ASTM Standard F2143-2016 also requires a 
relative humidity instrument accuracy of 2.0 percent. A 
tolerance lower than the instrument measurement accuracy cannot be 
captured by such an instrument. Therefore, a system with an accuracy of 
2 percent cannot measure a tolerance below 2 percent. To ensure that 
controlling for relative humidity in the test chamber is not unduly 
burdensome, DOE proposes to require a relative humidity instrument 
accuracy of 2.0 percent and to include a test condition 
tolerance on relative humidity of 5.0 percent. This is 
consistent with the tolerances included for relative humidity in ASTM 
Standard F2143-2016 and the BVM test procedure, and similar to the 
equivalent tolerance on wet bulb temperature for CRE testing. DOE's 
testing, including for the other equipment with similar tolerances, has 
shown that test laboratories are able to maintain relative humidity 
within the proposed test condition tolerance of 5.0 
percent.
    Although a relative humidity requirement is not currently specified 
in the existing test procedure, DOE does not expect the proposal to 
affect measured performance of existing ACIM models. As discussed, the 
test procedures for other refrigeration equipment require testing to an 
ambient humidity level consistent with that proposed for ACIMs in this 
NOPR. Additionally, the test facilities required to maintain the 
necessary ambient test temperature likely already implement humidity 
controls and DOE expects that existing tests would have been conducted 
in an ambient relative humidity within the proposed range, despite it 
not being a requirement in the current test procedure. Accordingly, DOE 
expects that the proposal would ensure repeatable and reproducible test 
results, but would not impact measured performance as compared to the 
existing test procedure.
    Issue 16: DOE requests comment on the proposal to control relative 
humidity at 35 5.0 percent. Specifically, DOE requests 
comment on the representativeness of 35 percent relative humidity in 
field use conditions, whether manufacturers currently control and 
measure relative humidity for ACIM testing (and if so, the conditions 
used for testing), and the burden associated with controlling relative 
humidity within a tolerance of 5.0 percent.
b. Water Hardness
    ASHRAE Standard 29-2015 and AHRI Standard 810-2016 do not specify 
the water hardness of the water supply used for testing. The United 
States Geological Survey (``USGS'') defines water hardness as the 
concentration of calcium carbonate in milligrams per liter (``mg/L'') 
of water and lists general guidelines for the classification of water 
hardness as 0 to 60 mg/L of calcium carbonate for soft water; 61 to 120 
mg/L of calcium carbonate for moderately hard water; 121 to 180 mg/L of 
calcium carbonate for hard water; and more than 180 mg/L of calcium 
carbonate for very hard water.\7\ In the January 2012 final rule, DOE 
stated that harder water depresses the freezing temperature of water 
and results in increased energy use to produce the same quantity of 
ice. 77 FR 1591, 1605. DOE also stated that hard water (i.e., water 
with a higher concentration of calcium carbonate) can affect energy 
consumption in the field due to increased scale build up on the heat 
exchanger surfaces over time, and the use of higher water purge 
quantities to help flush out dissolved solids to

[[Page 72337]]

limit scale build up. Id. However, DOE declined to set requirements for 
water hardness for testing because of insufficient information to allow 
proper consideration of such a requirement. Specifically, DOE did not 
have information regarding the impact of variation in water hardness on 
as-tested performance of ACIMs, and therefore could not justify the 
additional burden associated with establishing a standardized water 
hardness requirement at that time. 77 FR 1591, 1605-1606.
---------------------------------------------------------------------------

    \7\ See www.usgs.gov/special-topic/water-science-school/science/hardness-water?qt-science_center_objects=0#qt-science_center_objectswater.usgs.gov/owq/hardness-alkalinity.html.
---------------------------------------------------------------------------

    In the March 2019 RFI, DOE requested comment on the impact of water 
hardness on ACIM performance and on the burden associated with 
controlling for water hardness during testing. 84 FR 9979, 9984-9985.
    In response to the March 2019 RFI, the Joint Commenters stated that 
DOE should specify a value for water hardness in the test procedure 
that is representative of typical field conditions because water 
hardness may affect measured energy. They further commented that 
specifying such a requirement would improve repeatability and 
reproducibility and would also prevent manufacturers from testing using 
a water hardness that may improve ratings but not be representative of 
typical field performance. (Joint Commenters, No. 2 at p. 3)
    Hoshizaki commented that testing with a certain water hardness 
would not be economically feasible for manufacturers and that any 
discussion about how to incorporate such a requirement without undue 
burden on manufacturers would be best addressed in the ASHRAE 29 
standard committee. (Hoshizaki, No. 4 at p. 2)
    AHRI and Howe stated that the amount of total dissolved solids can 
have an impact on energy and water consumption, but the level of the 
impact is difficult to ascertain and is most likely insignificant under 
standard testing conditions on new ACIMs with clean evaporators. (AHRI, 
No. 5 at p. 6; Howe, No. 6 at p. 10) Brema commented that water 
hardness should be set to be in the range of the user manual and 
potability regulations. (Brema, No. 3 at p. 7)
    DOE conducted testing to investigate whether changing the water 
hardness could affect the energy consumption and harvest rate of ACIMs. 
Testing was conducted on new models (i.e., with clean evaporators prior 
to accumulation of any significant scale). DOE conducted water hardness 
tests on two batch type ice makers and one continuous type ice maker.
    According to the United States Geological Survey (``USGS''), the 
vast majority of water hardness in the United States ranges from 0 mg/L 
to 250 mg/L of calcium carbonate.\8\ Given the range of water hardness 
in the United States, DOE used a water hardness of 42 mg/L of calcium 
carbonate for a ``soft water'' test (which also represented water 
readily available at the test facility) and a water hardness of 342 mg/
L of calcium carbonate for a ``very hard water'' test (i.e., a 300 mg/L 
increase relative to the soft water test to represent an extreme 
comparison case). DOE tested four ACIMs in a test chamber with soft and 
very hard water hardness at the standard rating conditions to 
investigate the effect of water hardness on harvest rate and energy 
use. The results of these tests are summarized in Table III.5.
---------------------------------------------------------------------------

    \8\ See www.usgs.gov/media/images/map-water-hardness-united-states.

                                   Table III.5--ACIM Performance Differences of Soft Water Compared to Very Hard Water
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                           Harvest rate    Harvest rate                     Energy use      Energy use
             Unit                         Type               with soft    with very hard    Difference       with soft    with very hard    Difference
                                                              water *         water *           (%)           water *         water *           (%)
--------------------------------------------------------------------------------------------------------------------------------------------------------
1............................  Batch....................              95             105              11           10.49            9.43           -10.1
2............................  Batch....................             126             131               4            8.28            7.96            -3.9
3............................  Batch....................             351             359             2.3            5.73            5.64            -1.6
4............................  Continuous...............             562             582             3.4            4.40            4.18            -5.0
--------------------------------------------------------------------------------------------------------------------------------------------------------
* Soft Water was 42 mg/L of calcium carbonate during testing. Very Hard Water was 342 mg/L of calcium carbonate during testing.

    These test results show that water hardness can impact measured 
harvest rates and energy consumption rates, and that very hard water 
generally resulted in more favorable performance than soft water. DOE 
acknowledges that the observed test results show the opposite impact on 
performance than expected and discussed in the January 2012 final rule 
(i.e., that harder water would be expected to increase energy 
consumption).
    Given that the performance of the tested ACIMs improved with harder 
water, to limit the potential for testing under favorable conditions 
not necessarily representative of typical operation, DOE proposes to 
require that water used for testing have a maximum hardness of 180 mg/L 
of calcium carbonate. According to the USGS, a majority of the U.S. has 
ground water with a water hardness equal to or below 180 mg/L of 
calcium carbonate.\9\ Establishing a maximum water hardness of 180 mg/L 
would ensure that ACIMs are tested with water that is not considered 
``very hard'' according to the USGS and that the tested water hardness 
is within a range representative of water hardness that ACIMs are 
likely to experience in actual use.
---------------------------------------------------------------------------

    \9\ See water.usgs.gov/owq/hardness-alkalinity.html.
---------------------------------------------------------------------------

    DOE proposes that water hardness must be measured using a water 
hardness meter with an accuracy of 10 mg/L or taken from 
the most recent version of the water quality report that is sent by 
water suppliers, which is updated at least annually and is accessible 
at: ofmpub.epa.gov/apex/safewater/f?p=136:102. DOE expects that any 
test facilities in locations with water supply hardness greater than 
180 mg/L would likely already incorporate water softening controls, and 
therefore this proposal is not expected to require updates to existing 
test facilities. For this same reason, DOE does not expect that this 
proposal would impact rated performance for any ACIMs tested under the 
current DOE test procedure.
    DOE also notes that this proposal does not conflict with any 
provisions of the industry test and rating standards and would provide 
additional specifications to ensure the representativeness of the 
results and improve the repeatability and reproducibility of the test 
results.
    Issue 17: DOE requests comment on its proposal that water used for 
ACIM testing have a maximum water hardness of 180 mg/L of calcium 
carbonate and on whether any test facilities would not have water 
hardness supplied within the proposed allowable range. If there are 
such test facilities, DOE requests comment on whether the supply water 
is softened when testing ACIMs and, if

[[Page 72338]]

the water is not softened, the burden associated with implementing 
controls for water hardness. Additionally, while DOE is proposing that 
this requirement apply to all water supplied for ACIM testing, DOE 
requests information on whether this requirement should only be 
applicable to potable water used to make ice (and not any condenser 
cooling water).
c. Ambient Temperature Gradient
    The current ACIM test procedure incorporates by reference section 
5.1.1 of ASHRAE Standard 29-2009, which stipulates that, with the ice 
maker at rest, the vertical ambient temperature gradient in any foot of 
vertical distance from 2 inches above the floor or supporting platform 
to a height of 7 feet above the floor, or to a height of 1 foot above 
the top of the ice maker cabinet, whichever is greater, shall not 
exceed 0.5 [deg]F/foot. This language, which is consistent with the 
requirement in section 5.1.1 of ASHRAE Standard 29-2015, is consistent 
with the test room requirements for residential refrigerators, as 
specified in section 7.2 of ANSI-AHAM Standard HRF-1-1979, ``Household 
Refrigerators, Combination Refrigerator-Freezers, and Household 
Freezers'' (ANSI/AHAM HRF-1-1979), the version of the AHAM standard 
that was incorporated by reference in the DOE test procedure for 
residential refrigerators in a final rule published August 10, 1982. 47 
FR 34517. DOE modified the requirements associated with temperature 
gradient for residential refrigerators, in a final rule published April 
21, 2014, to remove the reference to a 7 feet height requirement and 
require only that the gradient be maintained to a height 1 foot higher 
than the top of the unit. 79 FR 22320, 22335.
    In the March 2019 RFI, DOE requested comment on how manufacturers 
are demonstrating compliance with the requirements of section 5.1.1 of 
ASHRAE Standard 29-2009.
    AHRI commented that manufacturers confirm compliance of test rooms 
or cells used for testing with all standards requirements, and that the 
standard committee and manufacturers deemed the requirements within the 
method of test to be adequate. (AHRI, No. 5 at p. 7)
    Hoshizaki commented that it confirms the compliance of the test 
room with the requirements before testing, and that there is no need to 
align the ACIM temperature gradient requirements with other standards 
because ice makers perform differently than other commercial 
refrigeration appliances. (Hoshizaki, No. 4 at p. 2)
    Howe commented that DOE should consider changing the requirement to 
limit the temperature measurement to 1 foot above the unit because 
there are no standard heights for test setups and units, so this change 
would ensure that the standard is consistent across installations. 
(Howe, No. 6 at p. 12)
    Because DOE did not receive information indicating that a 
modification to the existing requirements would improve test accuracy 
or decrease test burden, DOE is not proposing any changes to the 
ambient temperature gradient requirements. DOE agrees that there are no 
standard heights for test setups and units; however, the current 
requirements ensure that the temperature gradient is maintained to at 
least within 1 foot above the unit under test for all test setups.
    Issue 18: DOE requests comment on maintaining the existing ambient 
temperature gradient requirements, through an updated reference to 
ASHRAE Standard 29-2015, and on whether any modifications would improve 
test accuracy or decrease test burden.
d. Ambient Temperature and Water Temperature
    The current DOE ACIM test procedure incorporates by reference AHRI 
810-2007, which specifies an ambient temperature of 90 [deg]F and a 
supply water temperature of 70 [deg]F. AHRI 810-2016 provides the same 
specifications. However, many ice makers may be installed in 
conditioned environments such as offices, schools, hospitals, hotels, 
and convenience stores (see 80 FR 4646, 4700 (Jan. 28, 2015)), which 
may have ambient air temperatures and supply water temperatures higher 
or lower than those specified in AHRI Standard 810.
    In the March 2019 RFI, DOE requested comment on whether the ambient 
air temperature and water supply temperature specified in AHRI Standard 
810-2016, and in the current DOE test procedure, are appropriately 
representative of those temperatures during an average use cycle or 
whether different temperature specifications should be considered. 84 
FR 9979, 9985. In particular, DOE requested data and information 
describing the ambient air temperature and supply water temperature of 
different applications at which ACIM equipment are operated. Id.
    The Joint Commenters and Brema raised concerns about the 
representativeness of current ambient temperature conditions, stating 
that many ice makers are installed in conditioned spaces with ambient 
temperatures closer to 70 [deg]F. They commented that this would mean 
that efficiency ratings are not providing appropriately representative 
information to purchasers, although neither commenter submitted 
information or data as to actual field conditions. (Joint Commenters, 
No. 2 at p. 3; Brema, No. 3 at p. 8) The Joint Commenters further 
commented that DOE should consider testing ice makers at two sets of 
ambient temperature and supply water temperature conditions because 
there is likely a significant range of temperatures in the field 
reflecting different locations and applications. (Joint Commenters, No. 
2 at p. 4)
    Howe commented that lowering the ambient test temperature without 
the proper energy accounting will lead customers to choose less energy 
efficient options from a complete system perspective, because such 
units are assumed to be within a climate-controlled space. Howe stated 
that DOE must maintain the test conditions of 90 [deg]F ambient and 70 
[deg]F inlet water temperature because the inlet water temperature is 
representative of the average worst-case supply water that can be seen 
within the United States, and the ambient temperature ensures customers 
can understand the true energy costs associated with operation. (Howe, 
No. 6 at p. 10)
    AHRI stated that average use cycles vary greatly per applications 
based on water and ambient temperatures, and that the test procedure 
was developed to average outside variable conditions into a snapshot of 
unit performance under normal operating conditions. AHRI commented that 
test results provide comparable representation of energy consumption 
among products. (AHRI, No. 5 at p. 5) AHRI and Hoshizaki commented that 
the ambient air temperature and water supply temperature specified in 
AHRI Standard 810 were selected by manufacturers as a good compromise 
for a replicable, representative test. (AHRI, No. 5 at p. 6; Hoshizaki, 
No. 4 at p. 2)
    DOE acknowledges that ACIMs may be installed and operated in a 
range of ambient conditions. However, DOE is proposing to maintain the 
single set of rating conditions currently required in the DOE test 
procedure. Specifically, DOE is proposing to maintain the reference to 
AHRI Standard 810, through AHRI Standard 810-2016, for rating 
conditions because those were selected as representative, repeatable 
rating conditions of this equipment. As noted, EPCA requires that if 
AHRI Standard 810 is amended, DOE must

[[Page 72339]]

amend the test procedures for ACIM as necessary to be consistent with 
the amended AHRI test standard, unless DOE determines, by rule, 
published in the Federal Register and supported by clear and convincing 
evidence, that to do so would not meet the requirements for test 
procedures regarding representativeness and test burden. (42 U.S.C. 
6314(7)(B)) DOE does not have any contrary data or information 
regarding the representativeness of the conditions specified in AHRI 
Standard 810-2016.
    In addition, the response of ACIM refrigeration systems to varying 
ambient conditions is different than the response of refrigeration 
systems in other refrigeration and HVAC equipment. Other refrigeration 
or HVAC equipment is typically designed to maintain conditions within a 
space. Accordingly, as ambient conditions change, the refrigeration 
systems typically cycle (or in the case of variable-speed compressors, 
adjust speed) to match the varying heat loads. In the case of ACIMs, 
the refrigeration system continuously operates while actively making 
ice, as heat is constantly removed from the water throughout the 
freezing process. As a result, introducing a second lower-temperature 
test condition would not result in part-load operation for ACIMs and 
would not additionally differentiate between units based on a part-load 
response, as is the case for other refrigeration or HVAC equipment. 
Thus, DOE has tentatively determined that the existing test condition 
provides representative, repeatable rating conditions for this 
equipment, and DOE expects that the burden of introducing a second test 
condition (which would approximately double test duration) would not be 
justified.
    Issue 19: DOE requests comment on its proposal to maintain the 
existing ambient temperature and water supply temperature requirements. 
If modifications should be considered to improve test 
representativeness or decrease test burden, DOE requests supporting 
data and information.
e. Water Pressure
    As discussed in section III.C and shown in Table III.2, ASHRAE 
Standard 29-2015 now includes water pressure measurement requirements, 
whereas ASHRAE Standard 29-2009 did not address water pressure. Section 
6.3 of ASHRAE Standard 29-2015 directs that the pressure of the supply 
water be measured within 8 inches of the ACIM and that the pressure 
remains within the specified range (AHRI Standard 810-2007 and 2016 
both specify 30 +/-3 psig water supply) during the period of time that 
water is flowing into the ACIM inlet(s).
    Certain ACIMs do not continuously draw water into the unit during 
the entire test. The portions of the test when the water inlet valve 
opens may result in a short, transient state when the water pressure 
falls outside of the allowable tolerance. Eliminating such transient 
periods would likely require certain laboratories to re-configure their 
water supply setups. Because of this burden and the relatively low 
impact of these transient periods on water consumed (i.e., the 
transient periods are typically very short relative to the overall 
duration of water flow), DOE is proposing to allow for water pressure 
to be outside of the specified tolerance for a short period of time 
when water begins flowing into the unit.
    Section 2.4 of the DOE test procedure for consumer dishwashers 
addresses this same issue by requiring that the specified water 
pressure be achieved within 2 seconds of opening the water supply 
valve. 10 CFR 430, Subpart B, Appendix C1. The sampling rate in Section 
5.7 of ASHRAE Standard 29-2015 requires a maximum interval between data 
samples for water pressure of no more than 5 seconds. Therefore, DOE 
proposes to clarify that water pressure when water is flowing into the 
ice maker must be within the allowable range within 5 seconds of 
opening the water supply valve. DOE does not expect that this proposal 
would impact tested performance under the current DOE test procedure as 
it provides additional specificity regarding the existing water 
pressure requirements.
    Issue 20: DOE requests comment on its proposal to require that 
water pressure when water is flowing into the ice maker be within the 
allowable range within 5 seconds of opening the water supply valve.
4. Test Setup and Equipment Configurations
    Since publication of the January 2012 final rule, DOE has issued 
two final guidance documents addressing certain aspects of the ACIM 
test procedure: Prohibiting the use of temporary baffles and requiring 
use of a fixed purge water setting. As discussed in the following 
paragraphs, DOE has reviewed the guidance documents to determine 
whether they should be maintained and expressly included in the test 
procedure. In addition, in reviewing the existing DOE ACIM test 
procedure, DOE has initially determined that the representativeness and 
repeatability of the test procedure could be further improved through 
additional specifications for test installation, ambient temperature 
measurement, and testing ACIMs with dispensers.
a. Temporary Baffles
    After publication of the January 2012 final rule, DOE issued a 
guidance document on September 24, 2013, regarding the use of temporary 
baffles during testing.\10\ As described in the guidance, a baffle is a 
partition, usually made of a flat material such as cardboard, plastic, 
or sheet metal, that reduces or prevents recirculation of warm air from 
an ice maker's air outlet to its air inlet, or, for remote condensers, 
from the condenser's air outlet to its inlet. Temporary baffles refer 
to those installed only temporarily during testing and are not part of 
the ACIM model as distributed in commerce or installed in the field. 
During testing, the use of temporary baffles can block recirculation of 
warm condenser discharge air to the air inlet. This would reduce the 
average temperature of the air entering the inlet, which would result 
in lower energy use that would not be representative of the energy use 
of the unit as operated by the end user.
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    \10\ See www1.eere.energy.gov/buildings/appliance_standards/pdfs/acim_baffles_faq_2013-9-24final.pdf.
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    In the guidance document, DOE expressly stated that installing such 
temporary baffles is inconsistent with the ACIM test procedure, which 
states that the unit must be ``set up for testing according to the 
manufacturer's written instruction provided with the unit'' and that 
``no adjustments of any kind shall be made to the test unit prior to or 
during the test that would affect the ice capacity, energy usage, or 
water usage of the test sample.'' \11\ Therefore, DOE's final guidance 
stated that the use of baffles to prevent recirculation of air between 
the air outlet and inlet of the ice maker during testing is not 
consistent with the DOE test procedure for automatic commercial ice 
makers, unless the baffle is (a) a part of the ice maker or (b) shipped 
with the ice maker to be installed according to the manufacturer's 
installation instructions.
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    \11\ Section 4.1.4, ``Test Set Up,'' of AHRI Standard 810-2007 
and AHRI Standard 810-2016.
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    In the March 2019 RFI, DOE requested comment on the use of 
temporary baffles in testing ACIMs and whether DOE should amend the 
test procedure to permit their use in testing. 84 FR 9979, 9982-9983.
    The Joint Commenters commented that the test procedure needs to 
address testing with temporary baffles, as this guidance would help 
clarify the intent of the test procedure. (Joint Commenters, No. 2 at 
p. 1) Hoshizaki,

[[Page 72340]]

AHRI, and Howe commented that temporary baffles may not be used for 
testing, unless the baffle is found in product marketing, is shipped 
with the ice maker, and is to be installed according to the 
manufacturers' installation instructions. (Hoshizaki, No. 4 at p. 1; 
AHRI, No. 5 at p. 3; Howe, No. 6 at p. 4) Brema commented that all 
parts that can be removed by the final user should be removed during 
the energy consumption test. (Brema, No. 3 at p. 4)
    Based on the final guidance document and consistent with feedback 
received in response to the March 2019 RFI, DOE proposes to define the 
term ``baffle'' consistent with the description in the guidance 
document and to expressly prohibit the use of baffles when testing of 
ACIMs unless the baffle is (a) a part of the ice maker or (b) shipped 
with the ice maker to be installed according to the manufacturer's 
installation instructions. DOE is not proposing that all parts that can 
be removed by the final user shall be removed for testing. The proposed 
approach based on manufacturer installation instruction is likely how 
an ice maker would be installed during use and is most representative 
of the energy use of ACIMs operated in the field. This proposal does 
not add any burden or impact measured performance compared to the 
existing test procedure, as it is consistent with how the test 
procedure currently must be performed, and based on commenters' 
feedback, how it is currently being conducted.
    Issue 21: DOE requests comment on its proposal to expressly provide 
that a baffle must not be used when testing ACIMs unless the baffle is 
(a) a part of the ice maker or (b) shipped with the ice maker to be 
installed according to the manufacturer's installation instructions.
    The guidance document issued by DOE on September 24, 2013, also 
acknowledged that warm air discharged from an ice maker's outlet can 
affect the ambient air temperature measurement such that it fluctuates 
outside the maximum allowed 1 [deg]F or 2 
[deg]F range, and that baffles can prevent such fluctuation. Because 
temporary baffles are not permitted for use during testing, DOE stated 
in the guidance document that if the ambient air temperature 
fluctuations cannot be maintained within the required tolerances, 
temperature measuring devices may be shielded so that the indicated 
temperature will not be affected by the intermittent passing of warm 
discharge air at the measurement location. DOE also stated that the 
shields must not block recirculation of the warm discharge air into the 
condenser or ice maker inlet.
    Based on the final guidance document, DOE proposes to specify in 
the test procedure that if the ambient air temperature fluctuations 
(and relative humidity as discussed in section III.D.3.a) cannot be 
maintained within the required tolerances, temperature measuring 
devices (and relative humidity measuring devices) may be shielded to 
limit the impact of intermittent passing of warm discharge air at the 
measurement locations. DOE further proposes that if shields are used, 
they must not block recirculation of the warm discharge air into the 
condenser or ice maker inlet. DOE does not expect this proposal to 
impact measured ACIM performance compared to the existing test 
procedure, as it is consistent with the existing test approach.
    Issue 22: DOE requests comment on its proposal to specify that 
temperature measuring devices may be shielded to limit the impact of 
intermittent warm discharge air at the measurement locations and that 
if shields are used, they must not block recirculation of the warm 
discharge air into the condenser or ice maker air inlet.
    Issue 23: DOE requests comment on whether any ACIM models discharge 
air such that the temperature and relative humidity measuring devices 
would be unable to maintain the required ambient air temperature or 
relative humidity tolerances even with the measuring devices shielded. 
If so, DOE requests comment on whether alternate ambient air 
temperature and relative humidity measurement locations would be 
necessary (e.g., the ambient temperature measurement locations for 
water-cooled ice makers, if those locations are not affected by 
condenser discharge air) and if the ambient air temperature and 
relative humidity measured at the alternate locations should be within 
the same tolerances as would otherwise be required.
b. Purge Settings
    Purge water refers to water that is introduced into the ice maker 
during an ice-making cycle to flush dissolved solids out of the ice 
maker and prevent scale buildup on the ice maker's wetted surfaces. Ice 
makers generally allow for setting the purge water controls to provide 
different amounts of purge water or different frequencies of purge 
cycles. Different amounts of purge water may be appropriate for 
different levels of water hardness or contaminants in the ACIM water 
supply. Most ice makers have manually set purge settings that provide a 
fixed amount of purge water, but some ice makers include an automatic 
purge water control setting that automatically adjusts the purge water 
quantity based on the supply water hardness.
    Because purge water is cooled by the ice maker, allowing a 
different purge water quantity will result in a different measured 
energy use. To ensure representative and consistent test results for 
ice makers with automatic purge water controls, on September 25, 2013, 
DOE issued final guidance stating that ice makers with automatic purge 
water control should be tested using a fixed purge water setting that 
is described in the written instructions shipped with the unit as being 
appropriate for water of normal, typical, or average hardness.\12\ DOE 
further stated that the automatic purge setting should not be used for 
testing.
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    \12\ See www1.eere.energy.gov/buildings/appliance_standards/pdfs/acim_purge_faq_2013-9-25final.pdf.
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    In the March 2019 RFI, DOE requested comment on what purge settings 
should be considered for testing for ACIMs with multiple or automatic 
purge settings and whether any ACIMs exist with automatic purge 
settings but without a fixed purge setting appropriate for ``normal'' 
water hardness and, if such a unit exists, how it should be tested. 84 
FR 9979, 9983.
    The Joint Commenters commented that the test procedure would be 
more representative of the energy use of ACIM with automatic purge 
water control settings if these units were tested in such a way that 
allowed the controls to adjust automatically as they would in the 
field, stating that automatic purge water control settings may save 
energy by reducing purge water quantity when the water supply hardness 
is lower. (Joint Commenters, No. 2 at p. 2)
    Howe stated that the test procedure should specify the purge 
setting associated with the highest energy use, as purge energy use is 
significant and will impact the energy consumption of an ACIM over its 
average use cycle. Howe also explained that it is not aware of any 
automatically sensing purge or flush setting devices. (Howe, No. 6 at 
p. 5-6)
    AHRI commented that purge cycles and their frequency can affect the 
sensible heat transfer during the test and therefore influence the 
energy use. (AHRI, No. 5 at p. 3)
    Hoshizaki commented that the purge cycle's energy use over a year 
is negligible compared to the energy used to produce ice. (Hoshizaki, 
No. 4 at p. 1) Hoshizaki and AHRI commented that ideal purge settings 
vary based on the

[[Page 72341]]

water quality of the area, and purge settings are generally set by 
trained service technicians during installation. (Hoshizaki, No. 4 at 
p. 1; AHRI, No. 5 at p. 4) Hoshizaki commented that any changes to 
purge settings for testing should be addressed through ASHRAE 29. 
(Hoshizaki, No. 4 at p. 1)
    Consistent with DOE's existing guidance, DOE proposes that ice 
makers with automatic purge water control must be tested using a fixed 
purge water setting that is described in the manufacturer's written 
instructions shipped with the unit as being appropriate for water of 
normal, typical, or average hardness. Such a control setting is likely 
to reflect the most typical ACIM installation and operation. Any other 
automatic purge controls (i.e., those without any user-controllable 
settings) would operate as they would during normal use. Additionally, 
while ACIMs may be installed and set up by service technicians based on 
the installation location, such setup is not appropriate for testing 
because it may introduce variability in test settings based on the test 
facility location. Consistent with DOE's existing guidance, DOE is also 
proposing that purge water settings described in the instructions as 
suitable for use only with water that has higher or lower than normal 
hardness (such as distilled water or reverse osmosis water) must not be 
used for testing.
    This proposal does not conflict with any of the setup or 
installation requirements in AHRI 810-2016. Additionally, this proposal 
would not add burden to manufacturers or impact ACIM performance as 
measured under the existing test procedure, as it would codify the 
final guidance document issued on September 25, 2013, specifying use of 
a fixed purge setting.
    In the March 2019 RFI, DOE also explained that batch ice makers 
might initiate a flush or purge cycle every 12 hours, and continuous 
ice makers might pause the ice making operation periodically to 
accomplish the additional purge. 84 FR 9979, 9983. Testing according to 
the current test procedure might not include such a purge cycle, and 
thus the resulting tested energy use might not appropriately represent 
what an end user would experience in the field. Id. DOE requested 
comment on the presence and frequency of any ``additional'' or 
``increased-water'' purge cycles and their impact on energy and water 
use. Id.
    The Joint Commenters commented that because purge water is cooled 
by the ice maker, it contributes to energy use during a representative 
average use cycle. In addition, the Joint Commenters noted that the 
previous energy conservation standards rulemaking considered reduced 
potable water flow as a technology option for reducing energy use. The 
Joint Commenters further stated that DOE's analysis showed that some or 
all of the purge water drained from batch ice makers leaves the 
equipment near 32 [deg]F, which represents lost refrigeration that 
could potentially have been used to produce more ice. (Joint 
Commenters, No. 2 at p. 1) The Joint Commenters stated that DOE should 
investigate how to capture the impact of any ``additional'' or 
``increased-water'' purge cycles, including additional purges outside 
of regular cycling or continuous operation, which may not be captured 
by the current test procedure. (Joint Commenters, No. 2 at p. 2)
    AHRI commented that introducing specifications to require a purge 
cycle during the test would introduce additional burden to 
manufacturers, and that all ACIM units should be tested at the factory 
default settings. (AHRI, No. 5 at p. 4)
    Howe commented that the current ACIM test procedure does not allow 
for the energy use from a flush cycle to be determined, and that the 
current test procedure results are not representative of the total 
energy used by the ice maker when flush cycles are considered. Howe 
stated that some manufacturers allow settings that flush all contents 
of the evaporator, in which case all of the water/ice product inside of 
the evaporator is melted by the incoming water to ensure all the 
dissolved solids in the evaporator are flushed from the system. Howe 
commented that the energy used by the ice maker to make the chilled 
water/ice inside of the evaporator at the beginning of the cycle is 
wasted and not turned into useable ice product for the end user. Howe 
stated that following the flush, the ACIM will then turn on and need to 
pull down the evaporator to return to the steady state operating 
condition. (Howe, No. 6 at p. 6) Howe also suggests that the internal 
volume of ACIMs that use flush cycles be used to estimate the amount of 
ice product that is wasted during a flush cycle to determine an energy 
penalty associated with the flush cycle. (Howe, No. 6 at p. 6)
    Brema commented that the purge cycle must be excluded from the 
average functionality time and not be considered for the energy 
consumption calculation. (Brema, No. 3 at p. 4)
    DOE conducted testing to investigate the energy and water 
consumption associated with flush or purge cycles. Table III.6 
summarizes how a purge cycle contributes to the energy and water 
consumption of a continuous ACIM.

            Table III.6--Summary of Energy & Water Consumption of a Continuous ACIM With Purge Cycle
----------------------------------------------------------------------------------------------------------------
                                                                                      Energy
                              Mode                                 Average power    consumption    Average water
                                                                     draw (W)          (kWh)        usage (lbs)
----------------------------------------------------------------------------------------------------------------
Ice Production..................................................             936           11.23           * 275
Purge (every 12 hours by default)...............................              35            0.01             2.0
Recovery after Purge............................................           1,062            0.08             N/A
----------------------------------------------------------------------------------------------------------------
* This number represents the harvest weight during the associated operating period. The total amount of water
  used may be higher. N/A: The water used during the recovery after purge does not differ from normal ice
  production.

    As shown in Table III.6, the purge cycle, including the recovery 
after purge, consumed 0.09 kWh, representing less than 1 percent of the 
total energy consumed over a period of normal operation (i.e., ice 
production, automatic purge cycle, and purge recovery). Additionally, 
the ACIM consumed 2 gallons of water during the purge cycle, 
representing less than 1 percent of the total consumed over the period 
of normal operation.
    In comparison, DOE testing of a batch ACIM showed that the purge 
occurred once every 5 hours under the default setting and coincided 
with the start of a harvest, resulting in no separate purge cycle. DOE 
observed an increased batch cycle time for the purge cycle and a 
corresponding increase in ice collected. DOE also observed that power 
draw over the purge cycle was consistent with a typical non-purge 
cycle. As a result, the harvest rate and energy use rate

[[Page 72342]]

observed for a purge cycle were similar to those measured over stable 
non-purge cycles.
    DOE also observed that testing to account for the energy and water 
consumption of purge cycles would require a significant increase in 
total test time. Table III.7 presents DOE's estimates of the test 
durations under the existing test approach and under an approach that 
would account for purge operation.

            Table III.7--Summary of Estimated Test Durations With and Without Including Purge Cycles
----------------------------------------------------------------------------------------------------------------
                                                                     Duration  (hours)
                                         -----------------------------------------------------------------------
                Test unit                   Existing ice     Existing  test    Ice  production
                                           production test   total  (without     test  (with    Test total (with
                                           (without purge)       purge)            purge)            purge)
----------------------------------------------------------------------------------------------------------------
Continuous..............................                 2                 8              12.5              18.5
Batch...................................                 2                 8               5.5              11.5
----------------------------------------------------------------------------------------------------------------

    As discussed further in section III.F.1.a, DOE estimates a typical 
ACIM test duration to be 8 hours, including set up, pull-down, and test 
operation. The period of active ice production measured depends on how 
quickly the unit achieves stability, but the existing test approach 
requires measuring at least 5 or 6 ice collection periods (for batch 
and continuous ACIM, respectively) for confirming stability and 
conducting the test. DOE observed that the durations of the required 
ice collection periods were approximately 2 hours for both the 
continuous and batch ACIM in the test sample. Accounting for purge 
cycle operation would require extending the test period to capture both 
stable ice production and normal purge operation. This would require an 
estimated increase in test duration of 10.5 hours (more than double) 
for the continuous test unit and 3.5 hours (approximately 44 percent) 
for the batch test unit.
    The energy and water consumption during the flush or purge cycles 
are very small relative to the energy and water consumed during normal 
ice production and the additional test burden associated with measuring 
purge events would be a significant increase in test burden. Therefore, 
DOE is not proposing to address flush or purge cycles in its test 
procedure.
    Issue 24: DOE requests comment on its proposal to require ACIMs 
with automatic purge water control to be tested using a fixed purge 
water setting that is described in the manufacturer's written 
instructions shipped with the unit as being appropriate for water of 
normal, typical, or average hardness. DOE also requests comment on its 
initial determination to not account for energy or water used during 
intermittent flush or purge cycles. DOE continues to request data 
regarding the energy and water use impacts of purge cycles.
c. Clearances
    As discussed in section III.C and shown in Table III.2, the 
clearance requirements around a unit under test changed between ASHRAE 
Standard 29-2009 and ASHRAE Standard 29-2015. The current DOE test 
procedure, through reference to section 6.4 of ASHRAE Standard 29-2009, 
requires a clearance of 18 inches on all four sides of the test unit, 
while section 6.5 of ASHRAE Standard 29-2015 requires a minimum 
clearance of 3 feet to adjacent test chamber walls, or the minimum 
clearance specified by the manufacturer, whichever is greater.
    In response to the March 2019 RFI, Howe commented that it is 
reasonable for customers to expect units to perform at their ratings 
when using the minimum clearances as described in the manufacturer 
literature. Howe recommended that DOE require a clearance of 3 feet, or 
the minimum clearance allowed by the manufacturer, whichever is less, 
to better represent an average use cycle. Howe also commented that this 
clearance should include all machine clearances, not just walls within 
the test chamber, and that a minimum clearance enclosure be built for 
testing ACIMs based on the harshest manufacturer-recommended operating 
installation, without blocking an intake air path to the ice maker. 
Howe also commented that this setup would not be a large test burden as 
many manufacturers test units of similar size, and the enclosures could 
be used over multiple tests. (Howe, No. 6 at p. 4)
    DOE conducted testing to assess how the different clearance 
requirements could affect the measured energy consumption and harvest 
rate of ACIMs. DOE investigated the performance of ACIMs under four 
clearance setups: (1) The clearance required by ASHRAE Standard 29-
2015, (2) the clearance required by the current DOE test procedure 
(through reference to ASHRAE Standard 29-2009), (3) all minimum 
clearances as recommend by the manufacturer, and (4) the rear minimum 
clearance as recommend by the manufacturer with all other clearances 
per ASHRAE Standard 29-2015. Table III.8 summarizes how four test units 
performed under the four clearance setups.

                          Table III.8--Summary of Clearance Impact on ACIM Performance
----------------------------------------------------------------------------------------------------------------
                                                               Change in                        Change in energy
                                           Harvest rate      harvest rate         Energy          consumption
      Test unit        Clearance setup     (lbs of ice/      (from ASHRAE    consumption (kWh/    (from ASHRAE
                                              24hrs)         standard 29-     100 lbs of ice)    standard  29-
                                                                 2015)                               2015)
----------------------------------------------------------------------------------------------------------------
1...................  ASHRAE Standard                 573               N/A              4.93                N/A
                       29-2015.
                      Current DOE Test                575                0%              4.97                 1%
                       Procedure.
                      Minimum                         548               -4%              5.25                 6%
                       Clearances.
                      Minimum Rear                    576                1%              4.94                 0%
                       Clearance.
2...................  ASHRAE Standard                 814               N/A              4.46                N/A
                       29-2015.
                      Current DOE Test                815                0%              4.48                 0%
                       Procedure.
                      Minimum                         794               -2%              4.59                 3%
                       Clearances.

[[Page 72343]]

 
                      Minimum Rear                    820                1%             -4.41                 1%
                       Clearance.
3...................  ASHRAE Standard               1,164               N/A              4.41                N/A
                       29-2015.
                      Current DOE Test              1,164                0%              4.46                 1%
                       Procedure.
                      Minimum                       1,043              -10%              5.14                17%
                       Clearances.
                      Minimum Rear                  1,149               -1%              4.44                 1%
                       Clearance.
4...................  ASHRAE Standard               1,197               N/A              5.40                N/A
                       29-2015.
                      Current DOE Test              1,195                0%              5.43                 1%
                       Procedure.
                      Minimum                       1,105               -8%              6.04                12%
                       Clearances.
                      Minimum Rear                  1,197                0%              5.39                 0%
                       Clearance.
----------------------------------------------------------------------------------------------------------------

    The tests indicate that the different clearance requirements, 
except for the installation with all minimum clearances, have little to 
no impact on the measured performance of ACIMs. The impact observed 
from the minimum clearance test is likely due to the exhaust air being 
directed through the test enclosure (i.e., the minimum clearances on 
the sides, back, and top of the ACIM resulted in an enclosure guiding 
condenser exhaust air) back to the front air inlet on the ACIM, which 
results in the ACIM drawing in warmer air than under the three other 
setup configurations. As described in section III.D.4.a, testing with a 
temporary baffle to prevent such air flow is not appropriate, so the 
condenser exhaust re-circulated during this investigative testing.
    Based on these test results, an installation configuration that 
provides only the minimum manufacturer test clearances for all sides 
represents a worst-case installation for ACIM performance. While 
manufacturers might provide minimum clearances for all sides of a unit, 
the expectation may be that units are installed such that one or more 
of the sides has clearance exceeding the manufacturer minimum.
    Similarly, a minimum clearance of 3 feet to adjacent test chamber 
walls or a clearance of 18 inches on all four sides (as required by 
ASHRAE Standard 29-2015 and the current DOE test procedure, 
respectively) may also not be a typical ACIM installation. Because 
ACIMs are typically installed in commercial food service applications 
with space constraints, such as commercial kitchens, end users likely 
install their ACIMs against at least a rear wall using the manufacturer 
minimum clearance to maximize available working space. Based on the 
test data in Table III.7, testing according to the manufacturer-
specified minimum rear clearance has little to no measured impact on 
ACIM performance for the four test units. However, because ACIMs may 
exhaust condenser air from the rear of the unit, an inappropriate 
manufacturer minimum rear clearance (or lack of manufacturer 
instructions regarding rear clearance) could adversely affect ACIM 
performance while being representative of typical use, and should be 
captured in the tested performance.
    Therefore, DOE proposes that ACIMs be tested according to the 
manufacturer's specified minimum rear clearance requirements, or 3 feet 
from the rear of the ACIM, whichever is less. DOE is proposing testing 
be conducted with a minimum clearance of 3 feet or the minimum 
clearance specified by the manufacturer, whichever is greater, on all 
other sides of the ACIM and all sides of the remote condenser, if 
applicable. This clearance for all sides other than the rear of the 
ACIM is generally consistent with the requirement in ASHRAE Standard 
29-2015. As discussed, and shown in the DOE test data, the impact of 
this proposed change on measured energy use for currently certified 
ACIMs would likely be de minimis. DOE expects manufacturer installation 
instructions would typically provide for clearances that would ensure 
sufficient air flow to avoid any adverse impacts on ACIM performance 
under the proposed test setup.
    DOE is not proposing specific requirements for the wall used to 
maintain the rear clearance when conducting the test. Test laboratories 
would be able to satisfy the clearance requirements in any way they 
choose, as long as the test installation meets the proposed 
requirements.
    Issue 25: DOE requests comment on its proposal to require that 
ACIMs be tested according to the manufacturer's specified minimum rear 
clearance requirements, or 3 feet from the rear of the ACIM, whichever 
is less. All other sides of the ACIM and all sides of the remote 
condenser, if applicable, shall be tested with a minimum clearance of 3 
feet or the minimum clearance specified by the manufacturer, whichever 
is greater. DOE also requests comment on whether this proposal would 
affect measured energy use and harvest rate compared to the existing 
DOE test procedure.
d. Ambient Temperature Measurement
    Air temperature fluctuations from the test chamber or the ACIM's 
condenser exhaust air can potentially affect an ACIM's measured energy 
consumption and harvest rate.
    The current ACIM test procedure, which is based on AHRI Standard 
810-2007 and ASHRAE Standard 29-2009, does not specify whether a 
weighted or unweighted sensor is to be used to measure ambient 
temperature. A weighted sensor measures the temperature of a high 
conductivity (isothermal) mass to which it is connected. The mass slows 
equilibration of the measured temperature with the surrounding air, 
thus damping out air temperature fluctuations. This may result in a 
weighted sensor indicating that the fluctuations are within the 
required temperature tolerances, whereas an unweighted sensor could 
indicate temperature extremes exceeding the required temperature 
tolerances. This difference in function of the sensors impacts the 
application of the required temperature tolerances, i.e., temperature 
fluctuations that fall outside the required tolerances may not be 
detected when using a weighted sensor, but would be detected when using 
an unweighted sensor.
    In the March 2019 RFI, DOE requested comment about whether 
manufacturers use weighted or unweighted temperature measurement 
instruments to measure ambient temperatures during ice maker testing. 
DOE also sought comment and data on the benefits and burdens of using 
unweighted

[[Page 72344]]

temperature measurement instruments compared to weighted temperature 
measurement instruments. 84 FR 9979, 9985.
    Hoshizaki commented that it currently uses unweighted temperature 
measurement instruments to record ambient temperature readings during 
testing. (Hoshizaki, No. 4 at p. 2) AHRI stated that these unweighted 
instruments are quick to react to change but can exhibit some 
fluctuation during readings. AHRI also noted that unweighted 
instrumentation sufficiently meets the tolerances and requirements set 
forth in the test procedures and does not increase testing time or 
instrumentation cost as weighted temperature sensors would. (AHRI, No. 
5 at p. 7) Howe recommended that DOE make the type of temperature 
instrument explicit for each measurement location on the product, 
noting that an unweighted versus weighted temperature instrument can 
create uncertainty that will impact the average use cycle energy use. 
Howe also commented that room temperature could be measured by a 
weighted temperature device, while the condenser inlet air be measured 
by an unweighted temperature device, due to the nature of the inlet air 
directly impacting the performance of the refrigeration system. (Howe, 
No. 6 at p. 12-13)
    DOE conducted testing to evaluate the ability to meet the specified 
tolerances of ASHRAE Standard 29-2015 using both weighted and 
unweighted temperature sensors. The temperature fluctuations recorded 
by weighted temperature sensors may be less than those recorded with 
unweighted measurement due to damping of the fluctuations by the 
weighted thermal mass. As such, weighted sensors may give the false 
impression that ambient temperature tolerances of 2 [deg]F 
during the first 5 minutes of each freeze cycle, and not more than 
1 [deg]F thereafter, are met during testing. The 
measurement of ambient temperature using unweighted sensors provides 
more representative measures of actual instantaneous ambient 
temperature conditions than the measurement of weighted sensors. DOE 
observed in its testing that the ambient temperature was within the 
tolerances specified in ASHRAE Standard 29-2015 for all freeze cycles 
when using either weighted or unweighted sensors.
    Therefore, DOE proposes to specify that unweighted sensors shall be 
used to make all ambient temperature measurements. Based on comments, 
this proposal reflects current industry practice and would not add any 
burden. This proposal is consistent with AHRI Standard 810-2016 because 
it specifies the instrumentation for measuring ambient temperature, but 
does not otherwise change the existing requirements.
    Issue 26: DOE requests comment on its proposal to specify that 
ambient temperature measurements shall be made using unweighted 
sensors.
    The current DOE guidance and proposal in this NOPR regarding the 
use of temporary baffles, as discussed in section III.D.4.a, illustrate 
that temporary baffles can reduce or prevent recirculation of warm air 
from an ACIM's condenser exhaust air to its air inlet. This 
recirculation of warm air can potentially affect an ACIM's measured 
energy consumption and harvest rate, and using a temporary baffle for 
testing is unrepresentative of actual ACIM use. The recirculation of 
warm air may also affect the ability to maintain ambient temperature 
within the range specified in AHRI Standard 810-2016 and relative 
humidity within the range proposed in this NOPR. For example, if the 
condenser exhaust is warm enough and directed towards the air inlet 
location (and corresponding ambient temperature measurement), the 
measured ambient temperature may be warmer than the representative 
ambient temperature around the unit under test, even with shielding 
around the temperature sensor.
    To evaluate the extent of this potential impact on temperature, DOE 
tested an ACIM which exhausted its warm condenser air on the side of 
the ACIM adjacent to the side with the air intake. Three ambient 
thermocouples were placed 1 foot from the geometric center of each side 
around the ACIM in addition to the unshielded ambient thermocouple that 
was placed 1 foot from the air inlet. The unshielded ambient 
thermocouple that was located 1 foot from the air inlet was used to 
control the test chamber conditions in accordance with AHRI Standard 
810-2016 (i.e., the overall chamber temperature was reduced as 
necessary to maintain the temperature one foot in front of the air 
inlet as close to 90 [deg]F as possible). Table III.9 summarizes the 
results of this testing.

 Table III.9--Average Ambient Temperatures Measured on Each Side Around
                                 an ACIM
------------------------------------------------------------------------
                                      Opposite side of  Opposite side of
  Inlet ([deg]F)    Exhaust ([deg]F)  exhaust ([deg]F)   inlet ([deg]F)
------------------------------------------------------------------------
           89.9               90.2               88.5              88.2
------------------------------------------------------------------------

    As shown in Table III.9, the air within the chamber had to be 
reduced below 89 [deg]F (outside the 90 1 [deg]F allowable 
ambient temperature range specified in ASHRAE Standard 29-2015) to 
maintain the temperature at the air inlet near the specified 90 [deg]F 
condition. This data suggests that ACIM models that allow the warm 
condenser exhaust air to recirculate to the air intake may require 
lower overall ambient test chamber temperatures to maintain the 
specified condition at the air inlet. As discussed in section 
III.D.4.a, DOE's guidance regarding temporary baffles states that 
temperature measuring devices may be shielded so that the indicated 
temperature will not be affected by the intermittent passing of warm 
discharge air at the measurement location. DOE also noted that the 
shields must not block recirculation of the warm discharge air into the 
condenser or ice maker inlet. The ambient temperature measurement is 
meant to represent the temperature of the air around the unit under 
test that is not impacted by unit operation. Because test facilities 
may have difficulty effectively shielding the air inlet thermocouple 
from warm discharge air without blocking the recirculation of that air 
to the ACIM air inlet, DOE is proposing that the ambient temperature 
may be recorded at an alternative location. DOE proposes that for ACIMs 
in which warm air discharge impacts the ambient temperature as measured 
in front of the air inlet (i.e., the warm condenser exhaust airflow is 
directed to the ambient temperature location in front of the air 
inlet), the ambient temperature may instead be measured at locations 1 
foot from the cabinet, centered with respect to the sides of the 
cabinet, for each side of the ACIM cabinet with no air discharge or 
inlet. This proposal is an alternative intended to reduce burden 
compared to the existing approach implemented in DOE's current test 
procedure guidance. DOE expects that this proposal would

[[Page 72345]]

not impact measured ACIM performance compared to the existing test 
approach. DOE also proposes that the relative humidity measurement, as 
proposed in this NOPR, would also be made at the same alternative 
locations.
    Test installation according to the manufacturer's minimum rear 
clearance requirements, as discussed in section III.D.4.c, may affect 
the ability to measure the ambient temperature and relative humidity 1 
foot from the air inlet if the air intake is through the rear side of 
the ACIM and the minimum rear clearance is less than 1 foot from the 
air inlet. Additionally, the alternate measurement location, as 
proposed earlier in this section, would not be feasible for the rear 
side of a model with no air discharge or inlet on that side and with a 
minimum rear clearance of less than 1 foot.
    Accordingly, DOE proposes that if a measurement location 1 foot 
from the rear of an ACIM is not feasible for testing that would 
otherwise require a measurement at that location, the ambient 
temperature and relative humidity shall instead be measured 1 foot from 
the cabinet, centered with respect to the surface(s) of the ACIM, for 
any surfaces around the perimeter of the ACIM that do not include an 
air discharge or air inlet. DOE similarly does not expect this proposal 
to impact current ACIM measurements as it provides an alternative 
measurement location for the existing ambient temperature and relative 
humidity requirements.
    Issue 27: DOE requests comment on its proposal to allow for an 
alternate ambient temperature (and relative humidity) measurement 
location to avoid complications associated with shielding the 
measurement in front of the air inlet, as currently required. DOE also 
requests comment on the proposal for measuring ambient temperature and 
relative humidity for ACIMs for which the proposed rear clearance would 
preclude temperature measurements at the rear of the unit under test.
e. Ice Cube Settings
    DOE is aware that some ice makers have the capability to make 
various sizes of cubes. The size of the cube can typically be selected 
on the control panel of the ice maker, for example. Section 5.2 of AHRI 
Standard 810-2016 states that for machines with adjustable ice cube 
settings, standard ratings are determined for the largest and the 
smallest cube settings, and that ratings for intermediate cube settings 
may be published as application ratings. This is consistent with the 
current DOE requirement as incorporated by reference in AHRI Standard 
810-2007.
    In response to the March 2019 RFI, DOE received a comment from 
Brema suggesting that, if parts of an ACIM can be adjusted by the final 
user (e.g., electronic settings), the ACIM must be tested with the 
worst possible configuration. (Brema, No. 3 at p. 4)
    DOE is not proposing any change to the existing industry 
requirement to determine ratings under the largest and smallest cube 
settings for ACIMs with adjustable ice cube settings. EPCA requires the 
DOE test procedure to be reasonably designed to produce test results 
which reflect energy use during a representative average use cycle. The 
current requirement to test using the largest and smallest cube setting 
is based on the industry standard, which was developed based on 
industry's experience with this equipment. There is no information to 
support that testing at the ``worst possible configuration'' would be 
representative of an average use cycle. Additionally, the approach 
suggested by Brema would require manufacturers to test every possible 
size setting to determine which has the highest energy use rate. As 
such, DOE is not proposing to change the current requirement to test at 
both the smallest and largest cube setting, which is the same as the 
requirement in AHRI Standard 810-2016.
    Issue 28: DOE requests comment on maintaining the current 
requirement to test at the largest and smallest ice cube size settings, 
consistent with AHRI Standard 810-2016. DOE also requests information 
on the ice cube size setting typically used by customers with ACIMs 
with multiple size settings (largest, smallest, default, etc.).
f. Ice Makers With Dispensers
    DOE is aware of certain self-contained ACIMs that dispense ice to a 
user through an automatic dispenser when prompted by the user. Testing 
according to the current DOE test procedure or the updated industry 
standards as proposed in this NOPR may be difficult or impossible for 
certain ACIM configurations with automatic dispensers.
    Section 6.6 in ASHRAE Standard 29-2015 specifies that an ACIM must 
have its bin one-half full of ice when collecting capacity 
measurements. DOE is aware of self-contained ACIMs with dispensers that 
contain internal storage bins that are not accessible during normal 
operation (i.e., users access the ice only through use of the 
dispenser). Because the internal bins are not accessible during normal 
operation, it can be difficult or impossible to establish a storage bin 
one-half full of ice for testing. Additionally, isolating the ice 
produced during testing from the ice initially placed in a one-half 
full storage bin may be difficult or impossible, depending on the 
dispenser and internal storage bin configuration.
    Section 6.10 of ASHRAE Standard 29-2015 requires that the ACIM be 
completely assembled with all panels, doors, and lids in their normally 
closed positions during the test. Additionally, Section 4.1.4 of AHRI 
Standard 810-2016 requires that the test unit shall be configured for 
testing per the manufacturer's written instructions provided with the 
unit. It also requires that no adjustments of any kind shall be made to 
the test unit prior to or during the test that would affect the ice 
capacity, energy usage, or water usage of the test sample. Many self-
contained ACIMs with dispensers would require removing case panels or 
the top lid to access the internal ice bin for ice collection or 
establishing initial test setup. In typical operation, users would 
access the ice only through the dispenser mechanism.
    Through a letter dated January 28, 2020, Hoshizaki America, Inc. 
(``Hoshizaki'') petitioned for a waiver and interim waiver from the DOE 
ACIM test procedure at 10 CFR 431.134 for ice/water dispenser ACIM 
basic models to address the test issues previously described in this 
section (case number 2020-001 \13\). On July 23, 2020, DOE granted 
Hoshizaki an interim waiver to test the identified ACIM basic models 
with a modified test procedure. 85 FR 44529. After providing 
opportunity for public comment on the interim waiver and reviewing the 
one comment received, DOE granted Hoshizaki a waiver through a final 
decision and order published on October 28, 2020, requiring that the 
subject basic models be tested according to the modified alternate test 
procedure as follows:
---------------------------------------------------------------------------

    \13\ The petition and related documents are available at 
www.regulations.gov in docket EERE-2020-BT-WAV-0005.
---------------------------------------------------------------------------

    Prior to the start of the test, remove the front panel of the unit 
under test and insert a bracket to hold the shutter (which allows for 
the dispensing of ice during the test) completely open for the duration 
of the test. After inserting the bracket, return the front panel to its 
original position on the unit under test. Conduct the test procedure as 
specified in 10 CFR 431.134 except that the internal ice bin for the 
unit under test shall be empty at the start of the test and intercepted 
ice samples shall be obtained from a container in an external ice bin 
that is filled one-half full with

[[Page 72346]]

ice and is connected to the outlet of the ice dispenser through the 
minimum length of conduit that can be used. 85 FR 68315.
    This waiver granted to Hoshizaki includes instructions for testing 
the specific basic models addressed in that waiver process. However, 
other ACIM models with dispensers would likely require similar testing 
instructions. Moreover, after the granting of any waiver, DOE must 
publish in the Federal Register a notice of proposed rulemaking to 
amend its regulations to eliminate any need for the continuation of 
such waiver. 10 CFR 431.401(l). Therefore, DOE proposes to add general 
test instructions to the DOE test procedure at 10 CFR 431.134(b)(6) to 
allow for testing such models. DOE is proposing that ACIMs with a 
dispenser be tested with continuous production and dispensing of ice 
throughout the stabilization and test periods. If an ACIM with a 
dispenser is not able to allow for the continuous production and 
dispensing of ice because of certain mechanisms within the ACIM that 
prohibit this function, those mechanisms must be overridden to the 
minimum extent that allows for the continuous production and dispensing 
of ice. For example, this would allow for the temporary removal of 
panels or overriding of certain controls, if necessary. The capacity 
samples would be collected in an external bin one-half full with ice 
and connected to the outlet of the ice dispenser through the minimal 
length of conduit that can be used for the required time period as 
defined in ASHRAE Standard 29-2015. Because of the continuous 
production and dispensing of ice, these ACIMs would be required to have 
an empty internal storage bin at the beginning of testing. This would 
ensure that the collection periods capture only the quantity of ice 
produced during that period (i.e., this would avoid any ice being 
collected that was produced prior to the collection period). This 
proposed approach would address issues with testing ACIM models with 
automatic dispensers, while allowing a representative measure of how 
ACIMs with dispensers are typically used. This approach would also 
minimize test burden by avoiding the need to significantly alter the 
configurations of these ACIM models for testing (e.g., allowing for 
access to any internal storage bins during performance testing).
    Issue 29: DOE requests comment on its proposal to collect capacity 
samples for ACIMs with dispensers through the continuous production and 
dispensing of ice throughout testing, using an empty internal storage 
bin at the beginning of the test period and collecting the ice sample 
through the dispenser in an external bin one-half full of ice. DOE also 
requests comment on its proposal to allow for certain mechanisms within 
the ACIM that would prohibit the continuous production and dispensing 
of ice throughout testing to be overridden to the minimum extent that 
allows for the continuous production and dispensing of ice. DOE seeks 
information on how manufacturers of these ACIMs currently test and rate 
this equipment under the existing DOE test procedure, whether the 
proposal would impact the energy use as currently measured, and on the 
burden associated with the proposed approach or any alternative test 
approaches.
g. Remote ACIMs
    In the March 2019 RFI, DOE requested comment on whether the current 
test procedure could be improved to measure energy use more accurately 
during a representative average use cycle for remote condensing ice 
makers with dedicated condensing units. 84 FR 9979, 9983-9984. More 
specifically, DOE requested feedback on whether default refrigerant 
charging and line set specifications would be necessary absent 
manufacturer recommendations. Id. DOE also sought information on 
whether any additional test instructions would be needed for remote 
condensing ice makers. Id.
    AHRI noted that many units are meant to be installed with specific 
condensing equipment, and DOE should follow the manufacturer 
installation and operation instructions to appropriately set up and 
test the unit. (AHRI, No. 5 at p. 5)
    The Joint Commenters commented in support of providing default 
refrigerant charging and line set specifications, claiming it would 
provide consistency across testing laboratories and improve test 
repeatability and reproducibility. The Joint Commenters added that, 
before doing so, DOE should verify that the minimum requirement of 25 
feet of interconnection tubing specified in AHRI 810 is representative 
of typical field installations. (Joint Commenters, No. 2 at p. 2-3)
    Brema commented that the test must be performed according to 
technical specification and information listed on installation/
instruction manufacturer manual. (Brema, No. 3 at p. 5)
    Hoshizaki stated that ASHRAE 29 and AHRI 810 specify a minimum 25-
foot line set or manufacturer's recommended set and that any additions 
to the current test method would need to be addressed in the ASHRAE 29 
standard committee to verify that it would not be costly and 
burdensome. (Hoshizaki, No. 4 at p. 2)
    Howe requested that DOE mandate refrigerant line size and charge 
instructions be included by the manufacturer with all remote condensing 
applications because there are many differences between manufacturers' 
systems, and a general guideline will not suffice. Howe recommended 
that the line size length for remote installations continue to be 
specified in the standard and account for typical remote condensing 
application in the field. (Howe, No. 6 at p. 8)
    In the March 2019 RFI, DOE also requested comment on the 
appropriate test approach for remote ACIMs intended to be installed 
without a dedicated condensing unit (i.e., ACIMs intended for use with 
refrigerant supplied by a remote compressor rack). 84 FR 9979, 9983-
9984. DOE sought feedback on what types of these units are available on 
the market (i.e., batch vs. continuous), whether an enthalpy test 
approach similar to that used for commercial refrigeration equipment 
would be appropriate for testing these ice makers, and if so, any 
additional instructions that would be needed for such testing. Id.
    The Joint Commenters and Howe commented that DOE should apply a 
similar approach to remote condensing ice makers designed to be 
connected to compressor racks as for other types of remote condensing 
refrigeration equipment, which relies on a refrigerant enthalpy 
calculation and assumed compressor efficiencies to estimate the energy 
consumption of the compressor rack. (Joint Commenters, No. 2 at p. 3; 
Howe, No. 6 at p. 8-9)
    AHRI stated that remote condensing ice makers that connect to 
condensing racks are currently outside the scope of AHRI 810 and ASHRAE 
29. (AHRI, No. 5 at p. 5) Hoshizaki and AHRI commented that the market 
for these remote ACIM with non-dedicated condensing units is very 
small, and those that do exist are typically continuous. Hoshizaki and 
AHRI stated that testing units without dedicated compressors or 
condensers is more difficult due to the wide variety of installation 
variables. (Hoshizaki, No. 4 at p. 2; AHRI, No. 5 at p. 5)
    DOE is not proposing amendments to the existing test procedures for 
testing remote condensing ACIMs. Based on a review of manufacturer 
installation instructions for ACIMs with dedicated remote condensing 
units, manufacturers typically recommend line sets and/or limitations 
to installation locations.

[[Page 72347]]

DOE has preliminarily determined that testing according to the 
manufacturer recommendations, as is currently required, rather than one 
specified remote setup, would represent typical use in the field and 
would produce consistent test results.
    Many ACIMs that could be installed with refrigerant supplied by a 
compressor rack can also be tested with an appropriately sized 
dedicated condensing unit according to the existing test procedure. For 
ACIMs installed with a compressor rack, DOE lacks information on 
typical installation locations, operation, and market availability. As 
noted in the AHRI and Hoshizaki comments, the market for compressor 
rack installations is very small. Based on these comments, the existing 
requirement to test such units with an appropriately sized dedicated 
condensing unit is representative of typical use. Additionally, as 
discussed in the January 2012 final rule, any ACIMs designed only for 
connection to remote compressor racks are out of the scope of DOE's 
regulations. 77 FR 1591, 1600. Therefore, DOE is not proposing any 
amendments to its test procedure to address such units.
    Issue 30: DOE requests comment on its initial determination that 
additional test setup and installation instructions are not required 
for ACIMs with dedicated remote condensing units. DOE seeks information 
and test data on the range of ACIM performance within the manufacturer-
recommended installation parameters to determine whether additional 
requirements are needed to improve repeatability and reproducibility.
    Issue 31: DOE requests comment on its proposal to not establish 
test procedures for ACIMs intended for installation with a compressor 
rack. DOE seeks information on the market availability of such 
equipment, including how manufacturers currently test and rate these 
units, and the extent to which they are installed with a compressor 
rack rather than a dedicated condensing unit.
5. Modulating Capacity Ice Makers
    An ice maker could be designed to be capable of operating at 
multiple capacity levels, i.e., a ``modulating capacity ice maker.'' 
This modulation could be accomplished by using a single compressor with 
multiple or variable capacities, using multiple compressors, or in some 
other manner. In the January 2012 final rule, DOE did not establish a 
test method for measuring the energy use or water consumption of 
automatic commercial ice makers that are capable of operating at 
multiple capacities. 77 FR 1591, 1601-1602. The decision to exclude 
modulating capacity ice makers was based on the lack of existing ACIMs 
with modulating capacity, as well as limited information regarding how 
such equipment would function. Id.
    In the March 2019 RFI, DOE requested comment on the availability of 
modulating capacity ice makers in the market and, if any are available, 
DOE requested information on how such equipment functions, including 
typical capacity ranges and the relative frequency of use at different 
capacity ranges, and how such equipment is currently tested. 84 FR 
9979, 9981.
    AHRI and Howe commented that they are not aware of modulating 
capacity ACIM on the market today. (AHRI, No. 5 at p. 2; Howe, No. 6 at 
p. 2) AHRI added that if modulating capacity ACIMs become available, 
equipment manufacturers would provide the ASHRAE 29 committee with 
information on differences in equipment function. (AHRI, No. 5 at p. 2) 
Howe commented that future modulating capacity units should take a 
similar approach as taken in the residential refrigerator industry for 
features that temporarily introduce varying states of energy use (i.e., 
they would not be active for testing), with the justification that the 
customer could not permanently change the capacity of the ice maker. 
However, Howe commented that any mode that will be consistently used by 
the customer daily should be accounted for in any measurement of the 
average use cycle of the product. (Howe, No. 6 at p. 2)
    DOE conducted market research and examined publicly available 
sources to determine the prevalence of modulating capacity ice makers. 
DOE did not find any modulating capacity ice makers that are currently 
available in the market. Therefore, DOE is not proposing test 
procedures for modulating capacity ice makers.
    Issue 32: DOE requests comment on its initial determination 
regarding the lack of availability of modulating capacity ice makers on 
the market.
6. Standby Energy Use and Energy Use Associated With Ice Storage
    The current ACIM test procedure considers only active mode energy 
use when an ice maker is actively producing ice, and represents that 
consumption using a metric of energy use per 100 pounds of ice. The 
existing ACIM test procedure does not address standby energy use 
associated with continuously powered sensors and controls or ice 
storage outside of active mode operation. When not actively making ice, 
an ice maker continues to consume energy to power sensors and controls. 
In addition, ice that is stored in an integral or paired ice storage 
bin will melt over time and the ice maker will use additional energy to 
replace the ice that has melted to keep the bin full. In these ways, 
standby energy use from control devices and energy use associated with 
ice storage can impact the daily energy consumption of ACIM equipment.
    In the March 2019 RFI, DOE requested data and information on the 
magnitude of energy use associated with standby energy use and energy 
use associated with replacing melted ice, as well as the relationship 
of such values to daily energy consumption of ACIMs. 84 FR 9979, 9986.
    The Joint Commenters commented that incorporating standby energy 
use in the test procedure would provide a better representation of the 
daily energy consumption of ice makers and would require a minimal 
addition to test burden. (Joint Commenters, No. 2 at p. 4)
    Hoshizaki, AHRI, and Howe commented that standby energy use for 
ACIMs is negligible. (Hoshizaki, No. 4 at p. 3; AHRI, No. 5 at p. 9; 
Howe, No. 6 at p. 15)
    AHRI commented that standby energy use may be higher in remote 
condenser units because of the pump down switch, which energizes the 
compressor in the off-mode to maintain a balanced minimum pressure. 
(AHRI, No. 5 at p. 9) AHRI further stated that generally, ice makers do 
not run continuously, but it is possible for the equipment to be 
installed in restaurant kitchens or hotels where they could be used for 
an extended period of peak time. Because of the variations in 
application, AHRI stated that attempting to introduce an average use 
cycle beyond what is currently in the test procedure would be nearly 
impossible. (AHRI, No. 5 at p. 5)
    Howe commented that all customers have the potential of using the 
ice maker continuously in operation, so standby loss energy is only 
relevant if the unit is being turned on and off during its operation. 
(Howe, No. 6 at p. 15) Howe commented that it is critical that 
transient behavior be considered in the average use cycle if it is a 
feature of the ice maker because any interruptions in ice making that 
are caused by design are within the manufacturer's design and impact 
energy, potable water, and condenser water use. (Howe, No. 6 at p. 8) 
Howe stated that, if DOE wants to properly account for all energy used 
by the ice maker in an average use cycle, the test procedure must 
include transient processes that are inherent to ice maker operation. 
(Howe, No. 6 at p. 5) Howe commented that there would

[[Page 72348]]

be energy use associated with the standby as the unit rests and the 
increased energy use during pulldown \14\ of the unit once it starts 
again, which is like the energy use for ice maker flush cycles. If DOE 
determines that the average use cycle of a product includes the 
transient process of ice making, standby, pulldown and returning to ice 
making, Howe proposed that all aspects of that transient process be 
considered for energy use. (Howe, No. 6 at p. 15) Howe further proposed 
a potential test method that would account for transient energy 
consumption. (Howe, No. 6 at p. 6)
---------------------------------------------------------------------------

    \14\ The evaporator temperature increases when the refrigeration 
system cycles off. Pulldown refers to the additional energy use 
needed to re-cool the evaporator for ice production.
---------------------------------------------------------------------------

    Howe further commented in support of developing a test to account 
for ice melt rate. Howe stated that the utility of any ice produced is 
dependent on the customer's ability to use the ice before it melts. 
(Howe, No. 6 at p. 14)
    Brema commented that there is no current test to evaluate ice melt, 
but such a measurement could be integrated with a similar approach used 
for calorimetric verification. (Brema, No. 3 at p. 12) Brema also 
commented that DOE should add a measurement of the performance rating 
of ice storage bins as specified in standard AHRI 820-2017. (Brema, No. 
3 at p. 12)
    DOE researched available test methods for determining energy use 
associated with ice storage. The AHRI certification program currently 
includes rating ice storage bins using AHRI 820-2017, ``Performance 
Rating of Ice Storage Bins.'' Similar methods are currently referenced 
in the Australian and Canadian test methods and standards applicable to 
self-contained ice makers and storage bins.15 16 AHRI 820-
2017 describes a standardized method for measuring the ``efficiency'' 
of ice storage bins using a metric called ``Theoretical Storage 
Effectiveness,'' which describes the percent of ice that would remain 
in a bin 24 hours after it is produced. In contrast, the December 2014 
MREF Test Procedure NOPR considered energy use associated with ice 
storage based on testing the ice maker and storing the ice in a bin 
over a period of up to 48 hours with no ice retrieval to determine the 
energy use associated with replenishing the bin. 79 FR 74894, 74921-
74922.
---------------------------------------------------------------------------

    \15\ The Australian minimum energy performance standards 
(``MEPS'') apply to both stand-alone storage bins and ice storage 
bins contained in stand-alone equipment (AS/NZS 4865.2 & 3). The 
NRCan standard appears to apply only to storage bins contained in 
self-contained ice makers with integral storage bins.
    \16\ The newest version of the CSA test method, C742-15, refers 
directly to the 2012 version of AHRI 820 (and AHRI 821, which is the 
SI version of the standard).
---------------------------------------------------------------------------

    Many ice makers (including ice making heads (``IMHs'') and remote 
condensing unit (``RCU'') ice makers) can be paired with any number of 
storage bins, including those produced by other manufacturers. These 
ice makers are typically paired in the field with a bin chosen by the 
end user, rather than the manufacturer. However, DOE understands that 
many IMH and RCU equipment are advertised as compatible with a list of 
specific bins and, therefore, may be able to be rated based on 
recommended bin combinations.
    Based on comments received in response to the March 2019 RFI, the 
energy use of ACIMs in standby mode is likely very low compared to 
active mode ice making energy use. Additionally, the contribution of 
any standby mode energy use to overall energy use can vary 
significantly depending on the specific installation and end use of the 
ACIM.
    At this time, DOE does not have sufficient data and information to 
establish test procedures for standby energy use or energy use 
associated with ice storage. In addition, incorporating standby energy 
use and energy use associated with ice storage would require 
significant test procedure changes requiring an increase in test time. 
Therefore, because of the lack of data and undue burden on 
manufacturers, DOE is not proposing to amend its test procedures to 
account for standby or ice storage energy use.
    Issue 33: DOE requests comment on its proposal to not amend its 
test procedures to account for standby or ice storage energy use. DOE 
also requests data on the typical durations and associated energy use 
for all ACIM operating modes and on the potential burden associated 
with testing energy use in those modes.
7. Calculations and Rounding Requirements
    As compared to ASHRAE Standard 29-2009, section 9.1.1 ASHRAE 
Standard 29-2016 specifies averaging instructions for calculating the 
gross weight of product produced. ASHRAE Standard 29-2015 specifies to 
``average the quantity for the three samples to determine the ice 
produced.'' However, this averaging instruction is not specified for 
the water or energy consumption calculations.
    DOE proposes to provide explicitly that the energy use, condenser 
water use, and potable water use (as described in section III.D.8) be 
calculated by averaging the measured values for each of the three 
samples for each respective metric. This clarification would not affect 
the measured performance of ACIMs but would more explicitly present the 
calculation approach.
    Issue 34: DOE requests comment on the proposal to clarify that the 
energy use, condenser water use, and potable water use (as described in 
section III.D.8) be calculated by averaging the calculated values for 
the three measured samples for each respective metric.
    10 CFR 431.132 specifies rounding requirements for the ACIM metrics 
``energy use'' and ``maximum condenser water use.'' Specifically, DOE 
requires energy use to be in multiples of 0.1 kWh/100 lb and condenser 
water use to be in multiples of 1 gallon per 100 pounds of ice (``gal/
100 lb''). 10 CFR 431.132.
    AHRI Standard 810-2007, which is currently incorporated by 
reference in the DOE test procedure, and AHRI Standard 810-2016, which 
is proposed for use in this NOPR, specify rounding requirements for the 
following quantities:

             Table III.10--Summary of Rounding Requirements
------------------------------------------------------------------------
                                           AHRI standard 810 (both 2007
                Quantity                    and 2016, except as noted)
------------------------------------------------------------------------
Ice Harvest Rate.......................  1 lb/24 h.
Condenser Water Use Rate...............  1 gal/100 lb.
Potable Water Use Rate.................  0.1 gal/100 lb.
Energy Consumption Rate................  0.1 kWh/100 lb (2007); 0.01 kWh/
                                          100 lb (2016).
Ice Hardness Factor....................  Not Specified (percent).
------------------------------------------------------------------------


[[Page 72349]]

    DOE proposes to incorporate by reference AHRI Standard 810-2016, 
which would include the rounding requirements shown in Table III.10, 
with the exception of the provision for harvest rate. For harvest rate, 
the specified rounding to the nearest 1 lb/24 h could represent a 
significant percentage of harvest rates for low-capacity ACIMs. As 
discussed in section III.D.2, DOE observed low-capacity ACIMs available 
on the market with harvest rates as low as 7 lb/24 h. For this harvest 
rate, rounding to the nearest pound would allow a range of measured 
performance of approximately 7 percent to have the same 
harvest rate result. Section 5.5.1 of ASHRAE Standard 29-2015 provides 
that ice-weighing instruments have accuracy and readability of 1.0% of the quantity measured. Therefore, to avoid rounding 
harvest rate to a level that could impact test procedure accuracy, DOE 
proposes that harvest rate be rounded to the nearest 0.1 lb/24 h for 
ACIMs with harvest rates less than or equal to 50 lb/24 h.
    Although rounding requirements are provided for the final 
calculated values used for rating ice makers, the DOE test procedure 
does not provide requirements for rounding intermediate values used in 
the calculations to determine those final values. Where rounding is not 
specified, the DOE test procedure intends the calculations of these 
values to be performed with raw measured data and only the final result 
to be rounded (where specified). However, this is not expressly 
specified in the current test procedure language. As such, DOE is 
proposing to specifically state that all calculations must be performed 
with raw measured values and that only the resultant energy use, 
condenser water use, and harvest rate metrics be rounded.
    Issue 35: DOE requests comment on the proposal to expressly specify 
that all calculations must be performed with raw measured values and 
that only the resultant energy use, water use, and harvest rate metrics 
be rounded.
    In addition, ASHRAE Standard 29-2015 specifies stabilization 
requirements in terms of either percent or absolute weight without 
specifically referencing a calculation for percent variation. There are 
multiple methods to calculate the percent difference between two 
measurements. One common method is to take the absolute difference 
between two measurements, for example ``A'' and ``B'', and to divide by 
the measurement of either ``A'' or ``B''. Under this method, the choice 
of denominator would affect the calculated value. Another method to 
calculate the percent difference is to take the absolute difference 
between two measurements and divide by the average of the two 
measurements. Under this method, the calculated percent difference is 
always the same. Therefore, DOE proposes to apply this second method, 
using the following equation, to calculate the percent difference 
between any two measurements. This includes any calculation to 
determine if the ice production rate has stabilized between cycles or 
samples, as described in section III.D.12.
[GRAPHIC] [TIFF OMITTED] TP21DE21.009

    This proposal provides clarification but is otherwise consistent 
with the AHRI Standard 810-2016 and ASHRAE Standard 29-2015 
requirements.
    The proposed equation for calculating percent difference may affect 
when a unit meets the stability criteria. DOE analyzed over 50 ice 
maker tests conducted prior to this rulemaking where stability was 
calculated by dividing the absolute difference between the normalized 
harvest rate of two cycles by the harvest rate of one cycle, and found 
that calculating percent difference using the proposed equation did not 
affect the stabilization determination for any of the tests. The 
proposed equation to calculate the percent difference is appropriate to 
add clarity and consistency for testing.
    Issue 36: DOE requests comment on its proposal to clarify that 
percent difference shall be calculated based on the average of the two 
measured values.
8. Potable Water Use
    The water use of an ACIM includes water used in making the 
harvested ice; any dump or purge water used as part of the ice making 
process; and for water-cooled ACIMs, the water used to transfer heat 
from the condenser. In establishing initial standards for ACIMs, 
Congress addressed the latter type of water use. For ACIMs that produce 
cube type ice with capacities between 50 and 2500 pounds per 24-hour 
period, EPCA specified maximum condenser water use rates (in gallons 
per 100 pounds of ice). (42 U.S.C. 6313(d)(1)) In a note to the table 
establishing initial maximum condenser water use rates, the statute 
provides that ``Water use is for the condenser only and does not 
include potable water used to make ice.'' (Id.)
    In the January 2012 final rule, DOE noted that 42 U.S.C. 6313(d) 
does not require DOE to develop a water conservation test procedure or 
standard for potable water use in cube type ice makers or other ACIMs; 
rather, it sets forth energy and condenser water use standards for cube 
type ice makers at 42 U.S.C. 6313(d)(1), and allows, but does not 
require, the Secretary to issue analogous standards for other types of 
ACIMs under 42 U.S.C. 6313(d)(2). 77 FR 1591, 1605.
    DOE further stated that ambiguous statutory language may lead to 
multiple interpretations in the development of regulations. Id. DOE 
stated that the statutory language is unclear whether the footnote on 
potable water use that appears in 42 U.S.C. 6313(d)(1) has a 
controlling effect on 42 U.S.C. 6313(d)(2) and 42 U.S.C. 6313(d)(3)--
the statutory direction to review and consider amended standards. Id. 
Potable water use is not referenced anywhere else in 42 U.S.C. 6313(d), 
and thus it is difficult to determine whether this footnote is a 
clarification or a mandate in regard to cube type ice makers, and 
furthermore, whether it would apply to the regulation of other types of 
ACIMS. Id.
    DOE also stated that while there is generally a positive 
correlation between energy use and potable water use, DOE understands 
that at a certain point the relationship between potable water use and 
energy consumption reverses due to scaling. Id. Based on this fact, and 
given the added complexity inherent to the regulation of potable water 
use and the concomitant burden on ACIM manufacturers, DOE did not 
establish regulations or require testing and reporting of the potable 
water use of ACIMs. Id. Without a clear mandate from Congress on 
potable water use generally, and given that Congress chose not to 
regulate potable water use for cube type ice makers by statute, DOE 
exercised its discretion in choosing not to include potable water use 
rate in its test procedure for ACIMs. Id.

[[Page 72350]]

    ASHRAE Standard 29-2015 and AHRI Standard 810-2016 include 
measurements and rating requirements for potable water use. The 
measurement of ``non-condenser'' potable water use (i.e., water used in 
making the harvested ice and any dump or purge water) is currently not 
specified by the DOE test procedure, but is required by other programs, 
such as ENERGY STAR \17\ and the AHRI certification program.\18\
---------------------------------------------------------------------------

    \17\ The ENERGY STAR specification for automatic commercial ice 
makers is available at www.energystar.gov/sites/default/files/Final%20V3.0%20ACIM%20Specification%205-17-17_1.pdf.
    \18\ www.ahrinet.org/Certification.aspx.
---------------------------------------------------------------------------

    As stated in the March 2019 RFI, DOE reviewed the relationship 
between potable water use with harvest rate and daily energy 
consumption by analyzing reported ACIM data from the AHRI directory and 
the ENERGY STAR product database.19 20 84 FR 9979, 9986. DOE 
observed that all continuous ice makers had reported values for potable 
water use per 100 pounds of ice between 11.9 and 12.0 gallons, because 
all the water is converted to produced ice. Id. In contrast, potable 
water use varies for batch type ice makers because a portion of the 
potable water is drained from the sump at the end of each ice making 
cycle--this portion is different for different ice maker models. Id. 
The relationship between potable water use and daily energy consumption 
of the AHRI and ENERGY STAR data is not identifiable when considering 
the entire dataset. Id.
---------------------------------------------------------------------------

    \19\ Available at www.ahridirectory.org/NewSearch?programId=31&searchTypeId=3.
    \20\ Available at www.energystar.gov/productfinder/product/certified-commercial-ice-machines/results.
---------------------------------------------------------------------------

    Because energy use can be affected by many factors other than 
potable water use, the lack of a clear trend between energy use and 
potable water use does not provide a definitive indication of the 
extent of the relationship between energy use and potable water use. 
Although the exact relationship between potable water use and energy 
use is not understood, potable water use does impact energy use. An 
ACIM must chill the entering potable water to some extent. The extent 
to which potable water is not directly converted to ice, it still is 
likely cooled to 32 [deg]F. Cooled potable water that is not directly 
converted to ice and is drained from the unit represents lost 
refrigeration capacity. As such, reducing potable water use may provide 
the potential for reduced energy consumption.
    In the March 2019 RFI, DOE requested comment and information on the 
relationship between potable water use and energy use, including data 
quantifying the relationship, and on any potential impact this 
relationship could have on customer utility. 84 FR 9979, 9986.
    Hoshizaki commented that there is a large variation in the market 
on the relationship among energy use, water use, and ice production. 
(Hoshizaki, No. 4 at p. 2) Hoshizaki also asserted that regulating 
potable water usage would risk compromising the sanitary effects of ice 
makers. (Hoshizaki, No. 4 at p. 2-3)
    Howe commented that there is a relationship between potable water 
use and energy use that is not currently accounted for. Howe agreed 
with DOE's determination that potable water use for all ice makers at 
steady state will be around 12 gallons per 100 lbs of ice due to the 
mass balance of water flow into and ice product out of the ice maker 
(most ice makers take in 12 gallons of water to produce 100 lbs of ice 
at some ice hardness). Howe commented that the differentiation in 
potable water use would become apparent when the ice hardness 
adjustment factor is added to this measurement as it is for energy 
consumption and condenser water use in 10 CFR 431.134(b)(2)(i). Howe 
suggested that potable water use must also be adjusted based on ice 
hardness to show differentiation in the water use by various continuous 
type ice makers. (Howe, No. 6 at p. 13-14) Howe also offered a test 
proposal to determine the impact of ice melt rate on potable water use. 
(Howe, No. 6 at p. 14)
    AHRI commented that regulating water usage can be in direct 
conflict with the characteristics critical to the customers' needs and 
preferences, specifically clear and consistent ice. (AHRI, No. 5 at p. 
8)
    As discussed earlier in this section and as indicated in comments 
from interested parties, ACIMs currently available on the market have a 
wide range of potable water use, and the relationship between potable 
water use and energy use and harvest rate is not clear. Based on its 
inclusion in the AHRI certification program and ENERGY STAR 
qualification criteria, potable water use may be a useful measurement 
as part of characterizing the energy use associated with ACIM 
performance. To align with the AHRI certification program and ENERGY 
STAR, while allowing for a measurement of potable water use that is 
consistent with the test requirements proposed in this NOPR for energy 
use, harvest rate, and condenser water use, DOE is proposing to include 
measurement of potable water use in the DOE ACIM test procedure at 10 
CFR 431.134. Because DOE does not regulate ACIM potable water use, 
testing for the potable water measurements would be voluntary. 
Specifically, DOE is not proposing to require manufacturers to conduct 
the potable water provisions of the test procedure, and manufacturers 
would not report the results of the potable water test to DOE, if 
conducted. In addition, consistent with 42 U.S.C. 6314(d), 
manufacturers would not be required to use the voluntary test procedure 
as the basis of any representations of potable water use.
    DOE proposes that the measurement of potable water use would 
generally follow the test methods in AHRI Standard 810-2016 and ASHRAE 
Standard 29-2015, but with the additional test procedure amendments as 
proposed in this NOPR. This proposed approach is generally consistent 
with the methods currently used for the AHRI and ENERGY STAR programs; 
additionally, DOE does not expect that the additional test provisions 
as proposed in this NOPR would impact performance as measured under the 
existing approaches used by AHRI (AHRI Standard 810-2016) or ENERGY 
STAR (AHRI Standard 810-2007).
    DOE also proposes to add a definition of ``potable water use'' in 
10 CFR 431.132. DOE proposes to define ``potable water use'' as the 
amount of potable water used in making ice, which is equal to the sum 
of the ice harvested, dump or purge water, and the harvest water, 
expressed in gal/100 lb, in multiples of 0.1, and excludes any 
condenser water use. This definition is generally consistent with the 
term ``potable water use rate'' in AHRI Standard 810-2016, with the 
clarification that condenser water use is not considered potable water 
use.
    DOE notes that AHRI Standard 810-2016 specifies under the 
``Certified Ratings'' section that Potable Water Use Rate is applicable 
to Batch Type Ice-makers only, but that AHRI's Directory of Certified 
Product Performance includes the Potable Water Use Rate for both batch 
type and continuous type ACIMs.\21\ Thus, the industry standard appears 
to currently be used for measuring potable water use for both batch and 
continuous ice makers.
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    \21\ www.ahridirectory.org/NewSearch?programId=31&searchTypeId=3.
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    Issue 37: DOE requests comment on the proposal to include a 
voluntary method for measuring potable water use, including the value 
or drawbacks of such an approach, in 10 CFR 431.134 according to the 
industry standards and additional test procedure proposals as discussed 
in this NOPR.

[[Page 72351]]

    DOE is not proposing to adjust potable water use based on ice 
hardness factor, as is currently required for energy use and condenser 
water use. Both energy use and condenser water use correspond to the 
amount of heat removed from the potable water in producing ice. Ice 
that is more completely frozen will require more energy use and more 
heat rejection (via condenser water use, if applicable). However, 
potable water use does not similarly vary depending on the ice 
hardness. The same amount of potable water is used to make partially 
frozen ice as completely frozen ice. This is supported by nearly all 
continuous ice makers showing the same 11.9 to 12 gallons of potable 
water use per 100 lbs of ice production.
    Issue 38: DOE requests comment on its proposal that potable water 
use is not adjusted based on ice hardness factor.
    Potable water use for portable ACIMs is different than for ACIMs 
with a fixed water connection. As discussed, portable ACIMs require 
that the fill reservoir be filled manually with the maximum volume of 
water that is recommended by the manufacturer. In a portable ACIM, the 
unused ice collected in the ice storage bin slowly melts. This melt 
water is recycled back into the potable water reservoir to be reused. 
Unlike batch-type non-portable ACIMs, there is no dump or purge water 
to be measured. For portable ACIMs, water introduced to the reservoir 
is typically only removed from the unit as ice (and any corresponding 
melt water). Therefore, DOE proposes that the potable water use rate 
for portable ACIMs be defined as equal to the weight of ice and any 
corresponding melt water collected for the capacity test as specified 
in section 7.2 of ASHRAE Standard 29-2015.
    Issue 39: DOE requests comment on the proposal that the potable 
water use rate of portable ACIMs be defined as equal to the weight of 
ice and water captured for the capacity test, as specified in section 
7.2 of ASHRAE Standard 29-2015.

E. Representations of Energy Use and Energy Efficiency

    In addition to updates to the ACIM test procedure, DOE is proposing 
revisions to the provisions related to the sampling plan and the 
determination of represented values currently specified at 10 CFR 
429.45. DOE is also proposing to add equipment-specific enforcement 
provisions for ACIMs to 10 CFR 429.134.
1. Sampling Plan and Determination of Represented Values
    In subpart B to 10 CFR part 429, DOE provides uniform methods for 
manufacturers to determine representative values of energy- and non-
energy-related metrics for each basic model of covered equipment. The 
purpose of a statistical sampling plan is to provide a method to ensure 
that the test sample size (i.e., number of units tested) is 
sufficiently large that represented values of energy- and non-energy-
related metrics are representative of aggregate performance of the 
units in the basic model, while accounting for variability inherent to 
the manufacturing and testing processes.
    DOE currently specifies the ACIM-specific sampling plans and 
requirements for the determination of represented values at 10 CFR 
429.45. The sampling plan and method for determining represented values 
applies to represented values of maximum energy use, or other measures 
of energy consumption for which consumers would favor lower values.
    The reference to ``maximum energy use'' and ``maximum condenser 
water use'' in 10 CFR 429.45 could be misinterpreted to refer to the 
energy and water conservation standard levels for that basic model 
(i.e., the maximum allowable energy and maximum allowable condenser 
water use), as opposed to the tested performance. Therefore, for 
consistency and clarity, DOE is proposing to replace the term ``maximum 
energy use'' with the term ``energy use'' and the term ``maximum 
condenser water use'' with the term ``condenser water use.'' In 
addition, values of both energy and condenser water consumption are 
relevant for ACIMs. As such, DOE proposes to modify the language at 10 
CFR 429.45 to specify expressly that the sampling plan at 10 CFR 
429.45(a)(2)(i) applies both to measures of energy and condenser water 
use for which consumers would favor lower values.
    Similarly, 10 CFR 431.132 includes a definition for the term 
``maximum condenser water use.'' This language may also be 
misinterpreted to refer to the condenser water conservation standard 
level for a basic model as opposed to the tested condenser water use. 
Therefore, DOE proposes to modify the term and definition of ``maximum 
condenser water use'' to instead refer to the term ``condenser water 
use.'' This modification is consistent with the existing definition of 
``energy use'' in 10 CFR 431.132.
    In 10 CFR 429.45(a)(2)(ii), DOE also specifies calculation 
procedures for energy efficiency metrics, or measures of energy 
consumption where consumers would favor higher values. As DOE's test 
procedure does not require determining any values of energy efficiency 
or other measure of performance for which consumers would favor higher 
values, DOE proposes to remove this provision.
    In addition to energy related metrics, DOE's current certification 
requirements mandate reporting of harvest rate, a key non-energy metric 
associated with determining energy and water standards for ACIM 
equipment, as applicable. However, the certification requirements do 
not specify how the represented value of harvest rate for each basic 
model should be determined based on the test results from the sample of 
individual models tested. Similar to the requirements for other covered 
products and commercial equipment, DOE is proposing that the 
represented value of harvest rate for the basic model be determined as 
the mean of the measured harvest rates for each unit in the test 
sample, based on the same tests used to determine the reported energy 
use and condenser water use, if applicable. Although not specified in 
10 CFR 429.45, DOE expects manufacturers are currently certifying ACIM 
performance based on the tested harvest rates. Therefore, this proposed 
amendment would clarify the certification requirements but not impose 
any additional burden on manufacturers.
    Issue 40: DOE requests comment on its proposal to amend the 
sampling plan and reporting requirements for ACIMs in 10 CFR 429.45. 
DOE seeks information on how manufacturers are currently interpreting 
``maximum energy use'' and ``maximum condenser water use'' in the 
context of the sampling and certification report requirements, how 
manufacturers are currently determining harvest rates, and whether the 
proposed amendments would impose any burden on manufacturers. DOE also 
requests comment on its proposal to modify the term and definition of 
``maximum condenser water use'' to instead refer to ``condenser water 
use''.
2. Test Sample Value Rounding Requirements
    DOE currently requires test results for ACIMs to be rounded, as 
discussed in section III.D.7; however, the requirements in 10 CFR 
429.45 do not specify how values calculated in accordance with 10 CFR 
429.45(a) would be rounded. To ensure consistency, DOE proposes that 
any calculations according to 10 CFR 429.45 be rounded consistent with 
the

[[Page 72352]]

rounding requirements for individual test results. Specifically, DOE 
proposes to require that values calculated from a test sample be 
rounded as follows: Energy use to the nearest 0.01 kWh/100 lb, 
condenser water use to the nearest gal/100 lb, and harvest rate to the 
nearest 1 lb/24 h (for ACIMs with harvest rates greater than 50 lb/24 
h) or to the nearest 0.1 lb/24 h (for ACIMs with harvest rates less 
than or equal to 50 lb/24 h).
    Issue 41: DOE requests comment on its proposal to require that 
values calculated from a test sample be rounded as follows: energy use 
to the nearest 0.01 kWh/100 lb, condenser water use to the nearest gal/
100 lb, and harvest rate to the nearest 1 lb/24 h (for ACIMs with 
harvest rates greater than 50 lb/24 h) or to the nearest 0.1 lb/24 h 
(for ACIMs with harvest rates less than or equal to 50 lb/24 h).
3. Enforcement Provisions
    Subpart C of 10 CFR part 429 establishes enforcement provisions 
applicable to covered products and covered equipment, including ACIMs. 
Product-specific enforcement provisions are provided in 10 CFR 429.134, 
but that section currently does not specify product-specific 
enforcement provisions for ACIMs. The DOE requirements in 10 CFR 
429.134 provide which ratings or measurements will be used to determine 
the applicable energy or water conservation standard. Normally, DOE 
provides that the certified metric would be used for enforcement 
purposes (e.g., calculation of the applicable energy conservation 
standard) if the average value measured during enforcement testing is 
within a specified percent of the rated value (the specific allowable 
range varies based on product and equipment type). Otherwise, the 
average measured value would be used.
    Section 7.1 of ASHRAE Standard 29-2009, incorporated by reference 
into the DOE ACIM test procedure, allows for a two percent weight 
variation between collected ice samples when establishing stability of 
an ACIM. Additionally, section 5.5.1 of ASHRAE Standard 29-2009 
specifies that the ice-weighing instruments are required to be accurate 
to within 1.0 percent of the quantity measured. Due to the allowable 
variability in test measurements, a five percent tolerance around the 
rated capacity value likely is appropriate for ACIMs. This tolerance is 
consistent with the tolerance for ice harvest rate ratings as specified 
in section 5.4 of AHRI Standard 810-2016. DOE proposes that the 
certified capacity metric for ACIMs (i.e, the harvest rate), will be 
used for determination of the maximum allowable energy consumption and 
maximum allowable condenser water use levels only if the average 
measured harvest rate during DOE testing is within five percent of the 
certified harvest rate. If the average measured harvest rate is found 
to be outside of this range when compared to the certified harvest 
rate, the average measured harvest rate of the units in the tested 
sample will be used as the basis for determining the maximum allowable 
energy consumption and maximum allowable condenser water use levels, as 
applicable.
    Issue 42: DOE requests comment on its proposal to include a new 
section in 10 CFR 429.134 to specify how to determine whether the 
certified or measured harvest rate is used to calculate the maximum 
energy consumption and maximum condenser water use levels. DOE also 
requests comment on whether a five percent tolerance for the average 
measured harvest rate compared to the certified harvest rate is an 
appropriate tolerance for such purposes, and if not, what tolerance is 
appropriate.

F. Test Procedure Costs and Harmonization

1. Test Procedure Costs and Impact
    In this NOPR, DOE proposes to include low-capacity ACIM in the 
scope of the test procedure; amend the existing test procedure for 
ACIMs by referencing the most recent versions of the test procedures 
incorporated by reference; clarify the stability criteria; revise 
clearances for test installations; include additional updates to 
clarify appropriate test measurements, conditions, settings, and setup 
requirements; establish provisions for the voluntary measurement of 
potable water use; and update calculation instructions. DOE has 
tentatively determined that these proposed amendments would impact 
testing costs as discussed in the following paragraphs.
a. Testing Cost Impacts
    In the January 2012 final rule, DOE estimated per test costs of 
$5,000 to $7,500 for the current ACIM test procedure. 77 FR 1591, 1610. 
Based on feedback from third-party test laboratories since the January 
2012 final rule published, DOE found that the low end of that range, or 
$5,000, is representative of current ACIM per test cost. One proposal 
in this NOPR will affect the cost per test.
    As discussed in section III.C, ASHRAE Standard 29-2015 includes 
updated stabilization requirements. DOE is proposing to reference 
ASHRAE Standard 29-2015 and to provide additional detail to clarify 
application of its requirements. Under the proposed amendment, the ice 
production rate for each cycle used for the capacity test relative to 
any other cycle or sample used for the capacity test must meet the 
stability requirements. The current approach requires multiple cycles 
to determine stability, after which cycles are measured to test 
performance.
    The proposed approach would decrease the total number of cycles 
required for testing by using the same cycles to determine stability 
and measured performance. For batch ice makers, this proposal would 
eliminate the need for testing two cycles prior to the test. For 
continuous ice makers, this proposal would eliminate the need for 
measuring three consecutive 14.4 min samples taken within a 1.5-hour 
period prior to the test.
    DOE estimates that total ice maker test duration, including set up, 
pull-down, and test operation currently requires 8 hours. Under the 
proposed approach, DOE estimates that the total test time would 
decrease by approximately 1 hour. This represents a 12.5-percent 
reduction in test duration. Taking overhead costs into account, DOE 
estimates that the proposed stabilization requirement would decrease 
the test cost by approximately 6 percent, or $300 per test based on the 
initial $5,000 per test estimate. Because DOE requires manufacturers to 
test at least two units per model to certify performance, manufacturers 
would save approximately $600 per basic model for all future basic 
models tested in accordance with this proposed test procedure.
    Issue 43: DOE requests comment on the impact and test cost of the 
proposed amendment to clarify the use of test cycles to also confirm 
stability of the ACIM under test.
b. Additional Amendments
    The proposal discussed in the previous section regarding stability 
criteria would affect future individual test costs. DOE acknowledges 
that the proposals regarding stability criteria and the other proposals 
in this NOPR for testing ACIMs currently subject to DOE's energy 
conservation standards (i.e., ACIMs other than low-capacity ACIMs) 
would introduce changes to test conduct as compared to the existing 
test procedure. However, DOE does not expect that these proposals would 
affect measured ACIM performance as compared to the existing test 
procedure, as discussed in detail for each proposal in section III in 
this NOPR. Rather, the

[[Page 72353]]

proposals would generally improve representativeness, repeatability, 
and reproducibility of DOE's test procedure. Additionally, certain 
proposals would also incorporate test requirements consistent with DOE 
guidance or test procedure waivers already in effect for testing ACIMs. 
Because the proposed amendments are not expected to impact ACIM 
performance as measured under the existing DOE test procedure, DOE does 
not expect that manufacturers would be required to re-test or re-
certify their existing models.
    Specifically, DOE is proposing the following amendments that are 
not expected to impact measured ACIM performance compared to the 
existing DOE test procedure: (1) Updating references to the latest 
versions of the relevant industry standards (see section III.C); (2) 
clarifying stabilization criteria; (3) incorporating test conditions 
for relative humidity and water hardness and a clarification regarding 
water pressure (see section III.D.3); (4) clarifying test setup and 
setting requirements (see section III.D.4); (5) specifying a voluntary 
measurement of potable water use (see section III.D.8); and (6) 
including revisions to test sample calculations and enforcement 
provisions (see section III.E).
    While DOE does not expect the proposals in this NOPR to impact 
measured performance for ACIMs overall, in the event that a 
manufacturer was to opt to re-test models according to the proposed 
amended test procedure, DOE estimates this optional cost would be 
$9,400 per re-rated basic model.\22\
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    \22\ Based on the initial $5,000 per unit testing cost estimate 
and the $300 savings due to the stability criteria proposed, as 
discussed in section III.D.2 and III.F.1.a. Each basic model is 
tested twice.
---------------------------------------------------------------------------

    As described, DOE has tentatively determined that manufacturers 
would be able to rely on data generated under the existing test 
procedure should any of these proposed amendments be finalized.
    While DOE does not expect test facilities would require upgrades as 
a result of the proposed test procedure, if made final, DOE has 
developed cost estimates in the event that a facility may require 
upgrades to maintain the proposed test conditions for relative humidity 
and water hardness. As discussed in sections III.D.3.a and III.D.3.b, 
DOE expects that ACIM test facilities are already capable of 
maintaining the proposed conditions and likely already conduct ACIM 
testing in accordance with the conditions proposed in this NOPR.
    DOE estimates the cost for purchasing relative humidity controls to 
range from $1,000 to $5,000, depending on the method that is chosen. 
DOE estimates that the purchase and installation of a humidifier boiler 
with modulating valves that releases steam on the wall to control 
relative humidity costs $5,000. However, DOE notes there are less 
expensive options to control for relative humidity, such as a dedicated 
coil with reheat, steam generators, humidifiers, and dehumidifiers. In 
addition, manufacturers may have to purchase additional instrumentation 
to measure relative humidity. A typical relative humidity sensor is 
Campbell Scientific's EE181-L which meets the accuracy of 2 
percent and costs $500.\23\
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    \23\ www.campbellsci.com/ee181-l.
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    Regarding water hardness, DOE's market research shows that a 
typical water hardness meter has an accuracy of 10 mg/L and 
costs $235.\24\ However, DOE provides the option to verify water 
hardness from the most recent version of the water quality report that 
is sent by water suppliers, which would not require any additional 
substantive costs or burden.
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    \24\ www.hannainst.com/total-hardness-epa-portable-photometer.
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    DOE's proposed water hardness condition is intended to prevent 
testing under favorable conditions that are not representative of 
actual use (e.g., with water hardness that would be considered very 
hard by the USGS). DOE expects that ACIM test facilities either have 
water supplies within the proposed water hardness range or already 
incorporate water softeners for their laboratory water supply. 
Therefore, DOE does not expect that the water hardness proposal would 
add any costs or burden to ACIM manufacturers.
    Issue 44: DOE requests comment on the impacts and associated costs 
of the proposed amendments included in this NOPR. In particular, DOE 
requests feedback and data regarding whether the proposals would impact 
measured performance of ACIMs as tested under the existing DOE test 
procedure, and whether manufacturers would incur costs for re-testing 
existing ACIM models under the proposed procedure. DOE requests comment 
on the impact and any associated costs of the proposed amendments 
regarding test conditions for ACIM testing. DOE requests feedback on 
whether any test facilities would require upgrades to meet the proposed 
test requirements, and if so, information on the corresponding costs.
    As discussed in section III.A of this NOPR, DOE is proposing to 
include low-capacity ACIMs within the scope of its test procedure. DOE 
is proposing additional test procedure requirements to ensure 
appropriate testing of low-capacity ACIMs, as discussed in section 
III.D.1.
    Low-capacity ACIMs are not currently subject to DOE testing or 
energy conservation standards. As proposed, manufacturers would not be 
required to test low-capacity ACIMs until such time as DOE establishes 
energy conservation standards for such equipment. Under the proposed 
test procedure, were a manufacturer to choose to make representations 
of the energy efficiency or energy use of a low-capacity ACIM energy, 
beginning 360 days after a final rule were DOE to finalize the 
proposal, manufacturers would be required to base such representations 
on the DOE test procedure. (42 U.S.C. 6314(d))
    Based on a review of low-capacity ACIMs available on the market, 
DOE has determined that manufacturers either make no claims regarding 
the energy consumption of their low-capacity ACIM models, or currently 
specify energy consumption in accordance with the existing DOE test 
procedure (and referenced industry standards). After establishing any 
test procedure, DOE expects that the manufacturers currently electing 
to make no claims regarding low-capacity ACIM energy consumption would 
continue to do so. For the reasons described in section III.F.1.b and 
the other discussion sections of this NOPR, DOE does not expect that 
the proposed test procedure would impact measured ACIM performance 
compared to the existing DOE test procedure. Therefore, DOE does not 
expect that manufacturers currently providing energy consumption 
information for their low-capacity ACIMs would be required to re-test 
their low-capacity ACIM models.
    Based on these determinations, DOE does not expect that the 
proposal to expand the scope of its test procedure to low-capacity 
ACIMs would result in additional testing costs for low-capacity ACIM 
manufacturers. For any manufacturers not currently testing low-capacity 
ACIM models, testing according to the proposed test procedure would not 
be required (other than making voluntary representations of energy 
consumption) until the compliance date of any energy conservation 
standards for that equipment.
    Issue 45: DOE requests comment on any expected costs associated 
with the proposed amendment to expand test procedure scope to include 
low-capacity ACIMs. Specifically, DOE requests comment on whether any 
manufacturers are currently making representations of low-capacity ACIM 
energy consumption based on test methods that would

[[Page 72354]]

produce measures of performance that would be inconsistent with the 
existing DOE test procedure or the test procedure for low-capacity 
ACIMs as proposed in this NOPR.
2. Harmonization With Industry Standards
    DOE's established practice is to adopt relevant industry standards 
as DOE test procedures unless such methodology would be unduly 
burdensome to conduct or would not produce test results that reflect 
the energy efficiency, energy use, water use (as specified in EPCA) or 
estimated operating costs of that product during a representative 
average use cycle. 10 CFR 431.4; Section 8(c) of appendix A 10 CFR part 
430 subpart C. In cases where the industry standard does not meet EPCA 
statutory criteria for test procedures, DOE will make modifications 
through the rulemaking process to these standards and incorporate the 
modified standard as the DOE test procedure.
    The test procedure for ACIMs at 10 CFR 431.134 incorporates by 
reference certain provisions of AHRI Standard 810-2007 and ASHRAE 
Standard 29-2009. DOE references 810-2007 for definitions and test 
procedure requirements. DOE references ASHRAE Standard 29-2009 for test 
procedure requirements and ice hardness factor calculations. In 
September 2016, AHRI released an updated version of the 810 Standard 
which DOE is evaluating as part of this rulemaking. In January 2015, 
ASHRAE released an updated version of the 29 Standard which DOE is 
evaluating as part of this rulemaking. The industry standards DOE 
proposes to incorporate by reference via amendments described in this 
notice are discussed in further detail in section IV.M. DOE requests 
comment on the benefits and burdens of the proposed updates and 
additions to industry standards referenced in the test procedure for 
ACIM.

G. Compliance Date and Waivers

    EPCA prescribes that, if DOE amends a test procedure, all 
representations of energy efficiency and energy use, including those 
made on marketing materials and product labels, must be made in 
accordance with that amended test procedure, beginning 360 days after 
publication of such a test procedure final rule in the Federal 
Register. (42 U.S.C. 6314(d)(1)) To the extent the modified test 
procedure proposed in this document is required only for the evaluation 
and issuance of updated efficiency standards, use of the modified test 
procedure, if finalized, would not be required until the implementation 
date of updated standards. 10 CFR 431.4; Section 8(d) of appendix A 10 
CFR part 430 subpart C.
    Upon the compliance date of test procedure provisions of an amended 
test procedure, should DOE issue a such an amendment, any waivers that 
had been previously issued and are in effect that pertain to issues 
addressed by such provisions are terminated. 10 CFR 431.401(h)(3). 
Recipients of any such waivers would be required to test the products 
subject to the waiver according to the amended test procedure as of the 
compliance date of the amended test procedure. The amendments proposed 
in this document pertain to issues addressed by a waiver granted to 
Hoshizaki America, Inc. under case number 2020-001, as discussed in 
section III.D.4.f of this NOPR. Were DOE to finalize the amendments 
pertaining to the waiver granted to Hoshizaki at such time as testing 
were required according to the amended test procedure, the waiver 
granted to Hoshizaki would terminate and Hoshizaki would be required to 
make representations based on the amended test procedure.

IV. Procedural Issues and Regulatory Review

A. Review Under Executive Order 12866

    The Office of Management and Budget (``OMB'') has determined that 
this test procedure rulemaking does not constitute a ``significant 
regulatory action'' under section 3(f) of Executive Order 12866, 
Regulatory Planning and Review, 58 FR 51735 (Oct. 4, 1993). 
Accordingly, this action was not subject to review under the Executive 
order by the Office of Information and Regulatory Affairs (``OIRA'') in 
OMB.

B. Review Under the Regulatory Flexibility Act

    The Regulatory Flexibility Act (5 U.S.C. 601 et seq.) requires 
preparation of an initial regulatory flexibility analysis (``IRFA'') 
for any rule that by law must be proposed for public comment, unless 
the agency certifies that the rule, if promulgated, will not have a 
significant economic impact on a substantial number of small entities. 
As required by Executive Order 13272, ``Proper Consideration of Small 
Entities in Agency Rulemaking,'' 67 FR 53461 (August 16, 2002), DOE 
published procedures and policies on February 19, 2003, to ensure that 
the potential impacts of its rules on small entities are properly 
considered during the DOE rulemaking process. 68 FR 7990. DOE has made 
its procedures and policies available on the Office of the General 
Counsel's website: energy.gov/gc/office-general-counsel.
    DOE reviewed this proposed rule to amend the test procedures for 
ACIMs under the provisions of the Regulatory Flexibility Act and the 
procedures and policies published on February 19, 2003.
    The Small Business Administration (``SBA'') considers a business 
entity to be a small business, if, together with its affiliates, it 
employs less than a threshold number of workers specified in 13 CFR 
part 121. The size standards and codes are established by the 2017 
North American Industry Classification System (``NAICS'').
    ACIM manufacturers are classified under NAICS code 333415, ``Air-
conditioning and Warm Air Heating Equipment and Commercial and 
Industrial Refrigeration Equipment Manufacturing,'' which includes ice-
making machinery manufacturing.\25\ The SBA sets a threshold of 1,250 
employees or fewer for an entity to be considered as a small business. 
This employee threshold includes all employees in a business's parent 
company and any other subsidiaries.
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    \25\ www.sba.gov/document/support--table-size-standards
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    DOE conducted a focused inquiry into manufacturers of equipment 
covered by this rulemaking. DOE used available public information to 
identify potential small manufacturers. DOE accessed the CCD \26\ and 
other public information, including manufacturer and vendor websites, 
to create a list of companies that import or otherwise manufacture 
ACIMs covered by this rulemaking and identified 30 ACIM manufacturers.
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    \26\ DOE's Compliance Certification Database is available at 
www.regulations.doe.gov/certification-data/#q=Product_Group_spercent3A*.
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    DOE then reviewed these companies to determine whether the entities 
met the SBA's definition of ``small business'' and screened out any 
companies that do not offer products covered by this rulemaking, do not 
meet the definition of a ``small business,'' or are foreign-owned and 
operated. Based on this review, DOE has identified 12 companies that 
are small business manufacturers of ACIMs in the United States. The 
average revenue of the twelve small businesses is $52 million.
    As discussed in section III.F.1, DOE does not expect that ACIM 
manufacturers would incur any costs as a result of the proposals 
included in this NOPR. However, in the event that any test facilities 
may require upgrades to meet the proposed test conditions for relative 
humidity and water hardness, DOE has provided discussion and

[[Page 72355]]

estimated costs for potential upgrades and seeks comment on whether 
such upgrades may be necessary.
    As discussed in section III.F.1.b, DOE estimates the cost for 
purchasing relative humidity controls to range from $1,000 to $5,000, 
depending on the method that is chosen. In addition, the small 
businesses may have to purchase additional instrumentation to measure 
relative humidity, at an estimated cost of $500 per sensor.
    Regarding water hardness, DOE expects that the cost to monitor 
water hardness would be $235 for a typical meter. However, test 
facilities may also verify water hardness at no additional cost by 
reviewing the most recent version of the water quality report that is 
sent by water suppliers. DOE additionally does not expect that any 
facility upgrades would be necessary to comply with the water hardness 
requirement, as any ACIM test facilities likely already incorporate 
water softening controls if the water supply is considered very hard. 
Therefore, DOE estimates that the water hardness proposal requirement 
would result in minimal, if any, additional costs or burdens to small 
businesses.
    DOE does not expect ACIM manufacturers, including small business 
manufacturers, to incur any costs as a result of the test procedure 
proposed in this NOPR, even if a manufacturer were to incur costs due 
to the proposed test condition requirements. If manufacturers made 
updates to their test facility as a result of this NOPR, DOE estimates 
to maximum cost would be $5,735. The annual revenues for the twelve 
small manufacturers range from $1 million to $218 million. DOE 
estimates that the maximum cost would represent less than 1 percent of 
annual revenues for all identified small businesses. Therefore, DOE 
certifies that this rulemaking will not have a significant economic 
impact on a substantial number of small entities. Accordingly, DOE did 
not prepare an IRFA for this rulemaking. DOE's certification and 
supporting statement of factual basis will be provided to the Chief 
Counsel for Advocacy of the Small Business Administration for review 
under 5 U.S.C. 605(b).
    Issue 46: DOE requests comment on its conclusion that the proposed 
test procedure amendments would not have a significant economic impact 
on a substantial number of small entities. Additionally, DOE request 
comment on its finding that there are twelve small businesses that 
manufacture ACIMs in the United States. DOE will consider comments 
received in the development of any final rule.

C. Review Under the Paperwork Reduction Act of 1995

    Manufacturers of ACIMs must certify to DOE that their products 
comply with any applicable energy conservation standards. To certify 
compliance, manufacturers must first obtain test data for their 
products according to the DOE test procedures, including any amendments 
adopted for those test procedures. DOE has established regulations for 
the certification and recordkeeping requirements for all covered 
consumer products and commercial equipment, including ACIMs. (See 
generally 10 CFR part 429.) The collection-of-information requirement 
for the certification and recordkeeping is subject to review and 
approval by OMB under the Paperwork Reduction Act (PRA). This 
requirement has been approved by OMB under OMB control number 1910-
1400. Public reporting burden for the certification is estimated to 
average 35 hours per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information.
    Notwithstanding any other provision of the law, no person is 
required to respond to, nor shall any person be subject to a penalty 
for failure to comply with, a collection of information subject to the 
requirements of the PRA, unless that collection of information displays 
a currently valid OMB Control Number.

D. Review Under the National Environmental Policy Act of 1969

    In this NOPR, DOE proposes test procedure amendments that it 
expects will be used to develop and implement future energy 
conservation standards for ACIMs. DOE has determined that this rule 
falls into a class of actions that are categorically excluded from 
review under the National Environmental Policy Act of 1969 (42 U.S.C. 
4321 et seq.) and DOE's implementing regulations at 10 CFR part 1021. 
Specifically, DOE has determined that adopting test procedures for 
measuring energy efficiency of consumer products and industrial 
equipment is consistent with activities identified in 10 CFR part 1021, 
appendix A to subpart D, A5 and A6. Accordingly, neither an 
environmental assessment nor an environmental impact statement is 
required.

E. Review Under Executive Order 13132

    Executive Order 13132, ``Federalism,'' 64 FR 43255 (August 4, 1999) 
imposes certain requirements on agencies formulating and implementing 
policies or regulations that preempt State law or that have federalism 
implications. The Executive order requires agencies to examine the 
constitutional and statutory authority supporting any action that would 
limit the policymaking discretion of the States and to carefully assess 
the necessity for such actions. The Executive order also requires 
agencies to have an accountable process to ensure meaningful and timely 
input by State and local officials in the development of regulatory 
policies that have federalism implications. On March 14, 2000, DOE 
published a statement of policy describing the intergovernmental 
consultation process it will follow in the development of such 
regulations. 65 FR 13735. DOE has examined this proposed rule and has 
determined that it would not have a substantial direct effect on the 
States, on the relationship between the national government and the 
States, or on the distribution of power and responsibilities among the 
various levels of government. EPCA governs and prescribes Federal 
preemption of State regulations as to energy conservation for the 
products that are the subject of this proposed rule. States can 
petition DOE for exemption from such preemption to the extent, and 
based on criteria, set forth in EPCA. (42 U.S.C. 6316(a); 42 U.S.C. 
6297(d)) No further action is required by Executive Order 13132.

F. Review Under Executive Order 12988

    Regarding the review of existing regulations and the promulgation 
of new regulations, section 3(a) of Executive Order 12988, ``Civil 
Justice Reform,'' 61 FR 4729 (Feb. 7, 1996), imposes on Federal 
agencies the general duty to adhere to the following requirements: (1) 
Eliminate drafting errors and ambiguity, (2) write regulations to 
minimize litigation, (3) provide a clear legal standard for affected 
conduct rather than a general standard, and (4) promote simplification 
and burden reduction. Section 3(b) of Executive Order 12988 
specifically requires that Executive agencies make every reasonable 
effort to ensure that the regulation (1) clearly specifies the 
preemptive effect, if any, (2) clearly specifies any effect on existing 
Federal law or regulation, (3) provides a clear legal standard for 
affected conduct while promoting simplification and burden reduction, 
(4) specifies the retroactive effect, if any, (5) adequately defines 
key terms, and (6) addresses other important issues affecting clarity 
and general draftsmanship under any guidelines issued by the Attorney 
General. Section 3(c) of Executive Order 12988 requires Executive 
agencies to

[[Page 72356]]

review regulations in light of applicable standards in sections 3(a) 
and 3(b) to determine whether they are met or it is unreasonable to 
meet one or more of them. DOE has completed the required review and 
determined that, to the extent permitted by law, the proposed rule 
meets the relevant standards of Executive Order 12988.

G. Review Under the Unfunded Mandates Reform Act of 1995

    Title II of the Unfunded Mandates Reform Act of 1995 (UMRA) 
requires each Federal agency to assess the effects of Federal 
regulatory actions on State, local, and Tribal governments and the 
private sector. Public Law 104-4, sec. 201 (codified at 2 U.S.C. 1531). 
For a proposed regulatory action likely to result in a rule that may 
cause the expenditure by State, local, and Tribal governments, in the 
aggregate, or by the private sector of $100 million or more in any one 
year (adjusted annually for inflation), section 202 of UMRA requires a 
Federal agency to publish a written statement that estimates the 
resulting costs, benefits, and other effects on the national economy. 
(2 U.S.C. 1532(a), (b)) The UMRA also requires a Federal agency to 
develop an effective process to permit timely input by elected officers 
of State, local, and Tribal governments on a proposed ``significant 
intergovernmental mandate,'' and requires an agency plan for giving 
notice and opportunity for timely input to potentially affected small 
governments before establishing any requirements that might 
significantly or uniquely affect small governments. On March 18, 1997, 
DOE published a statement of policy on its process for 
intergovernmental consultation under UMRA. 62 FR 12820; also available 
at energy.gov/gc/office-general-counsel. DOE examined this proposed 
rule according to UMRA and its statement of policy and determined that 
the rule contains neither an intergovernmental mandate, nor a mandate 
that may result in the expenditure of $100 million or more in any year, 
so these requirements do not apply.

H. Review Under the Treasury and General Government Appropriations Act, 
1999

    Section 654 of the Treasury and General Government Appropriations 
Act, 1999 (Pub. L. 105-277) requires Federal agencies to issue a Family 
Policymaking Assessment for any rule that may affect family well-being. 
This rule would not have any impact on the autonomy or integrity of the 
family as an institution. Accordingly, DOE has concluded that it is not 
necessary to prepare a Family Policymaking Assessment.

I. Review Under Executive Order 12630

    DOE has determined, under Executive Order 12630, ``Governmental 
Actions and Interference with Constitutionally Protected Property 
Rights'' 53 FR 8859 (March 18, 1988), that this proposed regulation 
would not result in any takings that might require compensation under 
the Fifth Amendment to the U.S. Constitution.

J. Review Under Treasury and General Government Appropriations Act, 
2001

    Section 515 of the Treasury and General Government Appropriations 
Act, 2001 (44 U.S.C. 3516 note) provides for agencies to review most 
disseminations of information to the public under guidelines 
established by each agency pursuant to general guidelines issued by 
OMB. OMB's guidelines were published at 67 FR 8452 (Feb. 22, 2002), and 
DOE's guidelines were published at 67 FR 62446 (Oct. 7, 2002). Pursuant 
to OMB Memorandum M-19-15, Improving Implementation of the Information 
Quality Act (April 24, 2019), DOE published updated guidelines which 
are available at www.energy.gov/sites/prod/files/2019/12/f70/DOE%20Final%20Updated%20IQA%20Guidelines%20Dec%202019.pdf. DOE has 
reviewed this proposed rule under the OMB and DOE guidelines and has 
concluded that it is consistent with applicable policies in those 
guidelines.

K. Review Under Executive Order 13211

    Executive Order 13211, ``Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use,'' 66 FR 28355 
(May 22, 2001), requires Federal agencies to prepare and submit to OMB, 
a Statement of Energy Effects for any proposed significant energy 
action. A ``significant energy action'' is defined as any action by an 
agency that promulgated or is expected to lead to promulgation of a 
final rule, and that (1) is a significant regulatory action under 
Executive Order 12866, or any successor order; and (2) is likely to 
have a significant adverse effect on the supply, distribution, or use 
of energy; or (3) is designated by the Administrator of OIRA as a 
significant energy action. For any proposed significant energy action, 
the agency must give a detailed statement of any adverse effects on 
energy supply, distribution, or use should the proposal be implemented, 
and of reasonable alternatives to the action and their expected 
benefits on energy supply, distribution, and use.
    The proposed regulatory action to amend the test procedure for 
measuring the energy efficiency of ACIMs is not a significant 
regulatory action under Executive Order 12866. Moreover, it would not 
have a significant adverse effect on the supply, distribution, or use 
of energy, nor has it been designated as a significant energy action by 
the Administrator of OIRA. Therefore, it is not a significant energy 
action, and, accordingly, DOE has not prepared a Statement of Energy 
Effects.

L. Review Under Section 32 of the Federal Energy Administration Act of 
1974

    Under section 301 of the Department of Energy Organization Act 
(Pub. L. 95-91; 42 U.S.C. 7101), DOE must comply with section 32 of the 
Federal Energy Administration Act of 1974, as amended by the Federal 
Energy Administration Authorization Act of 1977. (15 U.S.C. 788; FEAA) 
Section 32 essentially provides in relevant part that, where a proposed 
rule authorizes or requires use of commercial standards, the notice of 
proposed rulemaking must inform the public of the use and background of 
such standards. In addition, section 32(c) requires DOE to consult with 
the Attorney General and the Chairman of the Federal Trade Commission 
(FTC) concerning the impact of the commercial or industry standards on 
competition.
    The proposed modifications to the test procedure for ACIMs would 
incorporate testing methods contained in the following commercial 
standards: AHRI Standard 810-2016 titled ``Performance Rating of 
Automatic Commercial Ice-makers'', and ANSI/ASHRAE Standard 29-2015 
titled ``Method of Testing Automatic Ice Makers''. DOE has evaluated 
these standards and is unable to conclude whether they fully comply 
with the requirements of section 32(b) of the FEAA (i.e., whether it 
was developed in a manner that fully provides for public participation, 
comment, and review). DOE will consult with both the Attorney General 
and the Chairman of the FTC concerning the impact of these test 
procedures on competition, prior to prescribing a final rule.

M. Description of Materials Incorporated by Reference

    In this NOPR, DOE proposes to incorporate by reference the test 
standard published by AHRI, titled ``Performance Rating of Automatic 
Commercial Ice-makers,'' AHRI Standard 810-2016, and the test standard 
published by ANSI/ASHRAE, titled ``Method of Testing Automatic Ice

[[Page 72357]]

Makers,'' ANSI/ASHRAE Standard 29-2015. These standards prescribe an 
industry recognized method of rating and testing automatic commercial 
ice makers to evaluate performance. AHRI Standard 810-2016 prescribes 
the rating requirements and refers to ASHRAE Standard 29-2015 for the 
method of test.
    Copies of AHRI Standard 810-2016 may be purchased from the Air-
Conditioning, Heating, and Refrigeration Institute at 2111 Wilson 
Blvd., Suite 500, Arlington, VA 22201, (703) 524-8800, or by going to 
www.ahrinet.org/Home.aspx. Copies of ANSI/ASHRAE Standard 29-2015 may 
be purchased from ASHRAE at 1791 Tulie Circle, NE Atlanta, GA 30329, 
(404) 636-8400, or by going to www.ashrae.org.

V. Public Participation

A. Participation in the Webinar

    The time and date of the webinar are listed in the DATES section at 
the beginning of this document. If no participants register for the 
webinar, it will be cancelled. Webinar registration information, 
participant instructions, and information about the capabilities 
available to webinar participants will be published on DOE's website: 
www1.eere.energy.gov/buildings/appliance_standards/standards.aspx?productid=53&action=viewlive. Participants are 
responsible for ensuring their systems are compatible with the webinar 
software.

B. Submission of Comments

    DOE will accept comments, data, and information regarding this 
proposed rule no later than the date provided in the DATES section at 
the beginning of this proposed rule.\27\ Interested parties may submit 
comments using any of the methods described in the ADDRESSES section at 
the beginning of this document.
---------------------------------------------------------------------------

    \27\ DOE has historically provided a 75-day comment period for 
test procedure NOPRs pursuant to the North American Free Trade 
Agreement, U.S.-Canada-Mexico (``NAFTA''), Dec. 17, 1992, 32 I.L.M. 
289 (1993); the North American Free Trade Agreement Implementation 
Act, Public Law 103-182, 107 Stat. 2057 (1993) (codified as amended 
at 10 U.S.C.A. 2576) (1993) (``NAFTA Implementation Act''); and 
Executive Order 12889, ``Implementation of the North American Free 
Trade Agreement,'' 58 FR 69681 (Dec. 30, 1993). However, on July 1, 
2020, the Agreement between the United States of America, the United 
Mexican States, and the United Canadian States (``USMCA''), Nov. 30, 
2018, 134 Stat. 11 (i.e., the successor to NAFTA), went into effect, 
and Congress's action in replacing NAFTA through the USMCA 
Implementation Act, 19 U.S.C. 4501 et seq. (2020), implies the 
repeal of E.O. 12889 and its 75-day comment period requirement for 
technical regulations. Thus, the controlling laws are EPCA and the 
USMCA Implementation Act. Consistent with EPCA's public comment 
period requirements for consumer products, the USMCA only requires a 
minimum comment period of 60 days. Consequently, DOE now provides a 
60-day public comment period for test procedure NOPRs.
---------------------------------------------------------------------------

    Submitting comments via www.regulations.gov. The 
www.regulations.gov web page will require you to provide your name and 
contact information. Your contact information will be viewable to DOE 
Building Technologies staff only. Your contact information will not be 
publicly viewable except for your first and last names, organization 
name (if any), and submitter representative name (if any). If your 
comment is not processed properly because of technical difficulties, 
DOE will use this information to contact you. If DOE cannot read your 
comment due to technical difficulties and cannot contact you for 
clarification, DOE may not be able to consider your comment.
    However, your contact information will be publicly viewable if you 
include it in the comment or in any documents attached to your comment. 
Any information that you do not want to be publicly viewable should not 
be included in your comment, nor in any document attached to your 
comment. Persons viewing comments will see only first and last names, 
organization names, correspondence containing comments, and any 
documents submitted with the comments.
    Do not submit to www.regulations.gov information for which 
disclosure is restricted by statute, such as trade secrets and 
commercial or financial information (hereinafter referred to as 
Confidential Business Information (CBI)). Comments submitted through 
www.regulations.gov cannot be claimed as CBI. Comments received through 
the website will waive any CBI claims for the information submitted. 
For information on submitting CBI, see the Confidential Business 
Information section.
    DOE processes submissions made through www.regulations.gov before 
posting. Normally, comments will be posted within a few days of being 
submitted. However, if large volumes of comments are being processed 
simultaneously, your comment may not be viewable for up to several 
weeks. Please keep the comment tracking number that www.regulations.gov 
provides after you have successfully uploaded your comment.
    Submitting comments via email. Comments and documents submitted via 
email, also will be posted to www.regulations.gov. If you do not want 
your personal contact information to be publicly viewable, do not 
include it in your comment or any accompanying documents. Instead, 
provide your contact information on a cover letter. Include your first 
and last names, email address, telephone number, and optional mailing 
address. The cover letter will not be publicly viewable as long as it 
does not include any comments.
    Include contact information each time you submit comments, data, 
documents, and other information to DOE. No faxes will be accepted.
    Comments, data, and other information submitted to DOE 
electronically should be provided in PDF (preferred), Microsoft Word or 
Excel, WordPerfect, or text (ASCII) file format. Provide documents that 
are not secured, written in English and free of any defects or viruses. 
Documents should not contain special characters or any form of 
encryption and, if possible, they should carry the electronic signature 
of the author.
    Campaign form letters. Please submit campaign form letters by the 
originating organization in batches of between 50 to 500 form letters 
per PDF or as one form letter with a list of supporters' names compiled 
into one or more PDFs. This reduces comment processing and posting 
time.
    Confidential Business Information. Pursuant to 10 CFR 1004.11, any 
person submitting information that he or she believes to be 
confidential and exempt by law from public disclosure should submit via 
email two well-marked copies: One copy of the document marked 
confidential including all the information believed to be confidential, 
and one copy of the document marked non-confidential with the 
information believed to be confidential deleted. DOE will make its own 
determination about the confidential status of the information and 
treat it according to its determination.
    It is DOE's policy that all comments may be included in the public 
docket, without change and as received, including any personal 
information provided in the comments (except information deemed to be 
exempt from public disclosure).

C. Issues on Which DOE Seeks Comment

    Although DOE welcomes comments on any aspect of this proposal, DOE 
is particularly interested in receiving comments and views of 
interested parties concerning the following issues:
    Issue 1: DOE requests comment on the proposal to include test 
procedure provisions for low-capacity ACIMs within the scope of the 
ACIM test procedure.
    Issue 2: DOE seeks information on whether there is an industry test

[[Page 72358]]

procedure for testing and rating low-capacity ACIMs. If so, DOE 
requests information on how such a test procedure addresses (or could 
address) the specific features of low-capacity ACIMs that are not 
present in higher-capacity ACIMs, such that the test procedure produces 
results that are representative of an average use cycle.
    Issue 3: DOE requests comment on the proposed definition for 
refrigerated storage automatic commercial ice maker.
    Issue 4: DOE requests comment on the proposed definition for 
portable automatic commercial ice maker.
    Issue 5: DOE requests comment on its proposal to amend 10 CFR 
431.132 to revise the definitions of ``Batch type ice maker'' and 
``Energy Use'' and delete the definition of ``Cube type ice,'' 
consistent with updates to AHRI Standard 810-2016. DOE also requests 
feedback on the proposed clarification that the DOE definitions take 
precedence over any conflicting industry standard definitions.
    Issue 6: DOE requests comment on its proposal to maintain the 
current specifications of 70 [deg]F 1 [deg]F ambient air 
temperature and 90 [deg]F 1 [deg]F initial water 
temperature for calorimetry testing. DOE also requests comment on its 
proposal to clarify that the harvested ice used to determine the ice 
hardness factor be collected from the ACIM under test at the Standard 
Rating Conditions specified in Section 5.2.1 of AHRI Standard 810-2016.
    Issue 7: DOE requests comment on its proposal to clarify that the 
temperature of the block of pure ice, as specified in Section A2.e. of 
ASHRAE Standard 29-2015, is measured by a thermocouple embedded at 
approximately the geometric center of the interior of the block. DOE 
also requests comment on its proposal to clarify that any water that 
remains on the block of ice must be wiped off the surface of the block 
before placing the ice into the calorimeter.
    Issue 8: DOE requests comment on its proposal to adopt by reference 
AHRI Standard 810-2016 and ASHRAE Standard 29-2015, except for the 
provisions for calorimetry testing as discussed previously, for all 
ACIMs.
    Issue 9: DOE requests comment on its proposal that portable ACIMs 
be subject to the test procedure as proposed in this NOPR, except that 
sections 5.4, 5.6, 6.2, and 6.3 of ASHRAE Standard 29-2015 do not 
apply. DOE requests comment on its proposal that the potable water 
reservoir be filled to the maximum level of potable water as recommend 
by the manufacturer with an initial water temperature of 70 [deg]F 
1.0 [deg]F. DOE requests comment on its proposal that the 
initial water temperature be established in an external container and 
verified by inserting a temperature sensor into approximately the 
geometric center of the water in the external container.
    Issue 10: DOE requests comment on its proposal that portable ACIMs 
have the ice storage bin empty prior to the initial reservoir fill and 
then produce ice into the ice storage bin until the bin is one-half 
full, at which point testing would proceed according to section 7 of 
ASHRAE Standard 29-2015. DOE requests comment on its proposal to define 
one-half full as half of the vertical dimension of the storage bin 
based on the maximum ice fill level within the storage bin.
    Issue 11: DOE requests comment on its proposal to specify that door 
openings must only occur on self-contained refrigerated storage ACIMs 
to collect samples after each cycle, and that the door shall be in the 
fully open position for 10.0 1.0 seconds to collect the 
sample. DOE also requests comment on its proposal to specify that 
``fully open'' means opening a door to an angle of not less than 75 
degrees.
    Issue 12: DOE requests comment on its proposal to test refrigerated 
storage ACIMs consistent with section 4.1.4 of AHRI Standard 810-2016 
(i.e., with adjustable temperature settings tested per the 
manufacturer's written instructions with no adjustment prior to or 
during the test). DOE requests comment on whether a specific 
refrigeration set point or internal air temperature should be specified 
for testing instead of the manufacturer's factory preset refrigeration 
set point.
    Issue 13: DOE requests comment on its interpretation of Section 
7.1.1 of ASHRAE Standard 29-2015 and proposal to require that all 
cycles or samples used for the capacity test meet the stability 
criteria.
    Issue 14: DOE requests comment on the proposal to increase the 
tolerance for continuous ice makers to collect samples from 15.0 
minutes 2.5 seconds to 15.0 minutes 9.0 
seconds.
    Issue 15: DOE requests comment on the proposal to require that all 
cycles or samples of low-capacity ACIMs used for the capacity test meet 
a 4 percent stability criterion and not be subject to an 
absolute stability criterion.
    Issue 16: DOE requests comment on the proposal to control relative 
humidity at 35 5.0 percent. Specifically, DOE requests 
comment on the representativeness of 35 percent relative humidity in 
field use conditions, whether manufacturers currently control and 
measure relative humidity for ACIM testing (and if so, the conditions 
used for testing), and the burden associated with controlling relative 
humidity within a tolerance of 5.0 percent.
    Issue 17: DOE requests comment on its proposal that water used for 
ACIM testing have a maximum water hardness of 180 mg/L of calcium 
carbonate and on whether any test facilities would not have water 
hardness supplied within the proposed allowable range. If there are 
such test facilities, DOE requests comment on whether the supply water 
is softened when testing ACIMs and, if the water is not softened, the 
burden associated with implementing controls for water hardness. 
Additionally, while DOE is proposing that this requirement apply to all 
water supplied for ACIM testing, DOE requests information on whether 
this requirement should only be applicable to potable water used to 
make ice (and not any condenser cooling water).
    Issue 18: DOE requests comment on maintaining the existing ambient 
temperature gradient requirements, through an updated reference to 
ASHRAE Standard 29-2015, and on whether any modifications would improve 
test accuracy or decrease test burden.
    Issue 19: DOE requests comment on its proposal to maintain the 
existing ambient temperature and water supply temperature requirements. 
If modifications should be considered to improve test 
representativeness or decrease test burden, DOE requests supporting 
data and information.
    Issue 20: DOE requests comment on its proposal to require that 
water pressure when water is flowing into the ice maker be within the 
allowable range within 5 seconds of opening the water supply valve.
    Issue 21: DOE requests comment on its proposal to expressly provide 
that a baffle must not be used when testing ACIMs unless the baffle is 
(a) a part of the ice maker or (b) shipped with the ice maker to be 
installed according to the manufacturer's installation instructions.
    Issue 22: DOE requests comment on its proposal to specify that 
temperature measuring devices may be shielded to limit the impact of 
intermittent warm discharge air at the measurement locations and that 
if shields are used, they must not block recirculation of the warm 
discharge air into the condenser or ice maker air inlet.
    Issue 23: DOE requests comment on whether any ACIM models discharge 
air such that the temperature and relative humidity measuring devices 
would be unable to maintain the required ambient air temperature or 
relative humidity tolerances even with the measuring

[[Page 72359]]

devices shielded. If so, DOE requests comment on whether alternate 
ambient air temperature and relative humidity measurement locations 
would be necessary (e.g., the ambient temperature measurement locations 
for water-cooled ice makers, if those locations are not affected by 
condenser discharge air) and if the ambient air temperature and 
relative humidity measured at the alternate locations should be within 
the same tolerances as would otherwise be required.
    Issue 24: DOE requests comment on its proposal to require ACIMs 
with automatic purge water control to be tested using a fixed purge 
water setting that is described in the manufacturer's written 
instructions shipped with the unit as being appropriate for water of 
normal, typical, or average hardness. DOE also requests comment on its 
initial determination to not account for energy or water used during 
intermittent flush or purge cycles. DOE continues to request data 
regarding the energy and water use impacts of purge cycles.
    Issue 25: DOE requests comment on its proposal to require that 
ACIMs be tested according to the manufacturer's specified minimum rear 
clearance requirements, or 3 feet from the rear of the ACIM, whichever 
is less. All other sides of the ACIM and all sides of the remote 
condenser, if applicable, shall be tested with a minimum clearance of 3 
feet or the minimum clearance specified by the manufacturer, whichever 
is greater. DOE also requests comment on whether this proposal would 
affect measured energy use and harvest rate compared to the existing 
DOE test procedure.
    Issue 26: DOE requests comment on its proposal to specify that 
ambient temperature measurements shall be made using unweighted 
sensors.
    Issue 27: DOE requests comment on its proposal to allow for an 
alternate ambient temperature (and relative humidity) measurement 
location to avoid complications associated with shielding the 
measurement in front of the air inlet, as currently required. DOE also 
requests comment on the proposal for measuring ambient temperature and 
relative humidity for ACIMs for which the proposed rear clearance would 
preclude temperature measurements at the rear of the unit under test.
    Issue 28: DOE requests comment on maintaining the current 
requirement to test at the largest and smallest ice cube size settings, 
consistent with AHRI Standard 810-2016. DOE also requests information 
on the ice cube size setting typically used by customers with ACIMs 
with multiple size settings (largest, smallest, default, etc.).
    Issue 29: DOE requests comment on its proposal to collect capacity 
samples for ACIMs with dispensers through the continuous production and 
dispensing of ice throughout testing, using an empty internal storage 
bin at the beginning of the test period and collecting the ice sample 
through the dispenser in an external bin one-half full of ice. DOE also 
requests comment on its proposal to allow for certain mechanisms within 
the ACIM that would prohibit the continuous production and dispensing 
of ice throughout testing to be overridden to the minimum extent that 
allows for the continuous production and dispensing of ice. DOE seeks 
information on how manufacturers of these ACIMs currently test and rate 
this equipment under the existing DOE test procedure, whether the 
proposal would impact the energy use as currently measured, and on the 
burden associated with the proposed approach or any alternative test 
approaches.
    Issue 30: DOE requests comment on its initial determination that 
additional test setup and installation instructions are not required 
for ACIMs with dedicated remote condensing units. DOE seeks information 
and test data on the range of ACIM performance within the manufacturer-
recommended installation parameters to determine whether additional 
requirements are needed to improve repeatability and reproducibility.
    Issue 31: DOE requests comment on its proposal to not establish 
test procedures for ACIMs intended for installation with a compressor 
rack. DOE seeks information on the market availability of such 
equipment, including how manufacturers currently test and rate these 
units, and the extent to which they are installed with a compressor 
rack rather than a dedicated condensing unit.
    Issue 32: DOE requests comment on its initial determination 
regarding the lack of availability of modulating capacity ice makers on 
the market.
    Issue 33: DOE requests comment on its proposal to not amend its 
test procedures to account for standby or ice storage energy use. DOE 
also requests data on the typical durations and associated energy use 
for all ACIM operating modes and on the potential burden associated 
with testing energy use in those modes.
    Issue 34: DOE requests comment on the proposal to clarify that the 
energy use, condenser water use, and potable water use (as described in 
section III.D.8) be calculated by averaging the calculated values for 
the three measured samples for each respective metric.
    Issue 35: DOE requests comment on the proposal to expressly specify 
that all calculations must be performed with raw measured values and 
that only the resultant energy use, water use, and harvest rate metrics 
be rounded.
    Issue 36: DOE requests comment on its proposal to clarify that 
percent difference shall be calculated based on the average of the two 
measured values.
    Issue 37: DOE requests comment on the proposal to include a 
voluntary method for measuring potable water use, including the value 
or drawbacks of such an approach, in 10 CFR 431.134 according to the 
industry standards and additional test procedure proposals as discussed 
in this NOPR.
    Issue 38: DOE requests comment on its proposal that potable water 
use is not adjusted based on ice hardness factor.
    Issue 39: DOE requests comment on the proposal that the potable 
water use rate of portable ACIMs be defined as equal to the weight of 
ice and water captured for the capacity test, as specified in section 
7.2 of ASHRAE Standard 29-2015.
    Issue 40: DOE requests comment on its proposal to amend the 
sampling plan and reporting requirements for ACIMs in 10 CFR 429.45. 
DOE seeks information on how manufacturers are currently interpreting 
``maximum energy use'' and ``maximum condenser water use'' in the 
context of the sampling and certification report requirements, how 
manufacturers are currently determining harvest rates, and whether the 
proposed amendments would impose any burden on manufacturers. DOE also 
requests comment on its proposal to modify the term and definition of 
``maximum condenser water use'' to instead refer to ``condenser water 
use''.
    Issue 41: DOE requests comment on its proposal to require that 
values calculated from a test sample be rounded as follows: Energy use 
to the nearest 0.01 kWh/100 lb, condenser water use to the nearest gal/
100 lb, and harvest rate to the nearest 1 lb/24 h (for ACIMs with 
harvest rates greater than 50 lb/24 h) or to the nearest 0.1 lb/24 h 
(for ACIMs with harvest rates less than or equal to 50 lb/24 h).
    Issue 42: DOE requests comment on its proposal to include a new 
section in 10 CFR 429.134 to specify how to determine whether the 
certified or measured harvest rate is used to calculate the maximum 
energy consumption and maximum condenser water use levels. DOE also 
requests comment on whether a five percent tolerance for the average 
measured harvest rate compared to the certified harvest rate is an 
appropriate tolerance

[[Page 72360]]

for such purposes, and if not, what tolerance is appropriate.
    Issue 43: DOE requests comment on the impact and test cost of the 
proposed amendment to clarify the use of test cycles to also confirm 
stability of the ACIM under test.
    Issue 44: DOE requests comment on the impacts and associated costs 
of the proposed amendments included in this NOPR. In particular, DOE 
requests feedback and data regarding whether the proposals would impact 
measured performance of ACIMs as tested under the existing DOE test 
procedure, and whether manufacturers would incur costs for re-testing 
existing ACIM models under the proposed procedure. DOE requests comment 
on the impact and any associated costs of the proposed amendments 
regarding test conditions for ACIM testing. DOE requests feedback on 
whether any test facilities would require upgrades to meet the proposed 
test requirements, and if so, information on the corresponding costs.
    Issue 45: DOE requests comment on any expected costs associated 
with the proposed amendment to expand test procedure scope to include 
low-capacity ACIMs. Specifically, DOE requests comment on whether any 
manufacturers are currently making representations of low-capacity ACIM 
energy consumption based on test methods that would produce measures of 
performance that would be inconsistent with the existing DOE test 
procedure or the test procedure for low-capacity ACIMs as proposed in 
this NOPR.
    Issue 46: DOE requests comment on its conclusion that the proposed 
test procedure amendments would not have a significant economic impact 
on a substantial number of small entities. Additionally, DOE request 
comment on its finding that there are twelve small businesses that 
manufacture ACIMs in the United States. DOE will consider comments 
received in the development of any final rule.

VI. Approval of the Office of the Secretary

    The Secretary of Energy has approved publication of this proposed 
rule.

List of Subjects

10 CFR Part 429

    Administrative practice and procedure, Confidential business 
information, Energy conservation, Reporting and recordkeeping 
requirements.

10 CFR Part 431

    Administrative practice and procedure, Confidential business 
information, Energy conservation test procedures, Incorporation by 
reference, and Reporting and recordkeeping requirements.

Signing Authority

    This document of the Department of Energy was signed on December 3, 
2021, by Kelly Speakes-Backman, Principal Deputy Assistant Secretary 
for Energy Efficiency and Renewable Energy, pursuant to delegated 
authority from the Secretary of Energy. That document with the original 
signature and date is maintained by DOE. For administrative purposes 
only, and in compliance with requirements of the Office of the Federal 
Register, the undersigned DOE Federal Register Liaison Officer has been 
authorized to sign and submit the document in electronic format for 
publication, as an official document of the Department of Energy. This 
administrative process in no way alters the legal effect of this 
document upon publication in the Federal Register.

    Signed in Washington, DC, on December 7, 2021.
Treena V. Garrett,
Federal Register Liaison Officer, U.S. Department of Energy.

    For the reasons stated in the preamble, DOE is proposing to amend 
parts 429 and 431 of Chapter II of Title 10, Code of Federal 
Regulations as set forth below:

PART 429--CERTIFICATION, COMPLIANCE, AND ENFORCEMENT FOR CONSUMER 
PRODUCTS AND COMMERCIAL AND INDUSTRIAL EQUIPMENT

0
1. The authority citation for part 429 continues to read as follows:

    Authority:  42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

0
2. Amend Sec.  429.45 by revising paragraph (a)(2) and adding paragraph 
(a)(3) to read as follows:


Sec.  429.45  Automatic commercial ice makers.

    (a) * * *
    (2) For each basic model of automatic commercial ice maker selected 
for testing, a sample of sufficient size shall be randomly selected and 
tested to ensure that any represented value of energy use, condenser 
water use, or other measure of consumption of a basic model for which 
consumers would favor lower values shall be greater than or equal to 
the higher of
    (i) The mean of the sample, where:
    [GRAPHIC] [TIFF OMITTED] TP21DE21.010
    
and, x is the sample mean; n is the number of samples; and 
xi is the i\th\ sample;
Or,

    (ii) The upper 95 percent confidence limit (UCL) of the true mean 
divided by 1.10, where:
[GRAPHIC] [TIFF OMITTED] TP21DE21.011

and x is the sample mean; s is the sample standard deviation; n is the 
number of samples; and t0.95 is the t statistic for a 95% 
two-tailed confidence interval with n-1 degrees of freedom (from 
appendix A).
    (3) The harvest rate of a basic model is the mean of the measured 
harvest rates for each tested unit of the basic model, based on the 
same tests to determine energy use and condenser water use, if 
applicable. Round the mean harvest rate to the nearest pound of ice per 
24 hours (lb/24 h) for harvest rates above 50 lb/24 h; round the mean 
harvest rate to the nearest 0.1 lb/24 h for harvest rates less than or 
equal to 50 lb/24 h.
* * * * *
0
3. Amend Sec.  429.134 by adding paragraph (s) to read as follows:


Sec.  429.134  Product-specific enforcement provisions.

* * * * *
    (s) Automatic commercial ice makers-verification of harvest rate. 
The harvest rate will be measured pursuant to the test requirements of 
10 CFR part 431 for each unit tested. The results of the measurement(s) 
will be averaged and compared to the value of harvest rate certified by 
the manufacturer of the basic model. The certified harvest rate will be 
considered valid only if the average measured harvest rate is within 
five percent of the certified harvest rate.
    (1) If the certified harvest rate is found to be valid, the 
certified harvest rate will be used as the basis for determining the 
maximum energy use and maximum condenser water use, if applicable, 
allowed for the basic model.
    (2) If the certified harvest rate is found to be invalid, the 
average measured harvest rate of the units in the sample will be used 
as the basis for determining the maximum energy use and maximum 
condenser water use, if applicable, allowed for the basic model.

[[Page 72361]]

PART 431--ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND 
INDUSTRIAL EQUIPMENT

0
4. The authority citation for part 431 continues to read as follows:

    Authority: 42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

0
5. Amend Sec.  431.132 by:
0
a. Adding a definition in alphabetical order for ``Baffle'',
0
b. Revising the definition of ``Batch type ice maker'';
0
c. Adding a definition in alphabetical order for ``Condenser water 
use'';
0
d. Removing the definition of ``Cube type ice'';
0
e. Revising the definition of ``Energy use'';
0
f. Removing the definition of ``Maximum condenser water use''; and
0
g. Adding definitions in alphabetical order for ``Portable automatic 
commercial ice maker'', ``Potable water use'', and ``Refrigerated 
storage automatic commercial ice maker''.
    The additions and revisions read as follows:


Sec.  431.132   Definitions concerning automatic commercial ice makers.

* * * * *
    Baffle means a partition (usually made of flat material like 
cardboard, plastic, or sheet metal) that reduces or prevents 
recirculation of warm air from an ice maker's air outlet to its air 
inlet--or, for remote condensers, from the condenser's air outlet to 
its inlet.
* * * * *
    Batch type ice maker means an ice maker having alternate freezing 
and harvesting periods.
    Condenser water use means the total amount of water used by the 
condensing unit (if water-cooled), stated in gallons per 100 pounds 
(gal/100 lb) of ice, in multiples of 1.
* * * * *
    Energy use means the total energy consumed, stated in kilowatt 
hours per one-hundred pounds (kWh/100 lb) of ice, in multiples of 0.01. 
For remote condensing (but not remote compressor) automatic commercial 
ice makers and remote condensing and remote compressor automatic 
commercial ice makers, total energy consumed shall include the energy 
use of the ice-making mechanism, the compressor, and the remote 
condenser or condensing unit.
* * * * *
    Portable automatic commercial ice maker means an automatic 
commercial ice maker that does not have a means to connect to a water 
supply line and has one or more reservoirs that are manually supplied 
with water.
    Potable water use means the amount of potable water used in making 
ice, which is equal to the sum of the ice harvested, dump or purge 
water, and the harvest water, expressed in gal/100 lb, in multiples of 
0.1, and excludes any condenser water use.
    Refrigerated storage automatic commercial ice maker means an 
automatic commercial ice maker that has a refrigeration system that 
actively refrigerates the self-contained storage bin.
* * * * *
0
6. Amend Sec.  431.133 by revising paragraphs (b)(1) and (c)(1) to read 
as follows:


Sec.  431.133   Materials incorporated by reference.

* * * * *
    (b) * * *
    (1) AHRI Standard 810-2016, Performance Rating of Automatic 
Commercial Ice-Makers, approved January 2018; IBR approved for Sec.  
431.134.
* * * * *
    (c) * * *
    (1) ANSI/ASHRAE Standard 29-2015, Method of Testing Automatic Ice 
Makers, approved April 30, 2015; IBR approved for Sec.  431.134.
* * * * *
0
7. Revise Sec.  431.134 to read as follows:


Sec.  431.134  Uniform test methods for the measurement of harvest 
rate, energy consumption, and water consumption of automatic commercial 
ice makers.

    (a) Scope. This section provides the test procedures for measuring 
the harvest rate in pounds of ice per 24 hours (lb/24 h), energy use in 
kilowatt hours per 100 pounds of ice (kWh/100 lb), and the condenser 
water use in gallons per 100 pounds of ice (gal/100 lb) of automatic 
commercial ice makers with capacities up to 4,000 lb/24 h. This section 
also provides voluntary test procedures for measuring the potable water 
use in gallons per 100 pounds of ice (gal/100 lb).
    (b) Testing and calculations. Measure the harvest rate, the energy 
use, the condenser water use, and, to the extent elected, the potable 
water use of each covered automatic commercial ice maker by conducting 
the test procedures set forth in AHRI Standard 810-2016, section 3, 
``Definitions,'' section 4, ``Test Requirements,'' and section 5.2, 
``Standard Ratings'' (incorporated by reference, see Sec.  431.133), 
and according to the provisions of this section. Use ANSI/ASHRAE 
Standard 29-2015 (incorporated by reference, see Sec.  431.133) 
referenced by AHRI Standard 810-2016 (incorporated by reference, see 
Sec.  431.133) for all automatic commercial ice makers, except as noted 
in the following paragraphs. If any provision of the referenced test 
procedures conflicts with the requirements in this section or the 
definitions in Sec.  431.132, the requirements in this section and the 
definitions in Sec.  431.132 control.
    (c) Test setup and equipment configurations--(1) Baffles. Conduct 
testing without baffles unless the baffle either is a part of the 
automatic commercial ice maker or shipped with the automatic commercial 
ice maker to be installed according to the manufacturer's installation 
instructions.
    (2) Clearances. Install all automatic commercial ice makers for 
testing according to the manufacturer's specified minimum rear 
clearance requirements, or with 3 feet of clearance from the rear of 
the automatic commercial ice maker, whichever is less, from the chamber 
wall. All other sides of the automatic commercial ice maker and all 
sides of the remote condenser, if applicable, shall have clearances 
according to section 6.5 of ANSI/ASHRAE Standard 29-2015.
    (3) Purge settings. Test automatic commercial ice makers equipped 
with automatic purge water control using a fixed purge water setting 
that is described in the manufacturer's written instructions shipped 
with the unit as being appropriate for water of normal, typical, or 
average hardness. Purge water settings described in the instructions as 
suitable for use only with water that has higher or lower than normal 
hardness (such as distilled water or reverse osmosis water) must not be 
used for testing.
    (4) Water hardness measurement. Confirm water hardness either by 
using a water hardness meter with an accuracy within 10 
milligrams per liter (mg/L) of calcium carbonate or by referring to the 
most recent version of the applicable water quality report provided 
through the U.S. EPA Consumer Confidence Reports. See ofmpub.epa.gov/apex/safewater/f?p=136:102.
    (5) Ambient conditions measurement--(i) Ambient temperature 
sensors. Measure all ambient temperatures according to section 6.4 of 
ANSI/ASHRAE Standard 29-2015, except as provided in paragraph 
(c)(5)(iv) of this section, with unweighted temperature sensors.
    (ii) Ambient relative humidity measurement. Except as provided in 
paragraph (c)(5)(iv) of this section, Ambient relative humidity shall 
be measured at the same location(s) used to confirm ambient dry bulb 
temperature,

[[Page 72362]]

or as close as the test setup permits. Ambient relative humidity shall 
be measured with an instrument accuracy of 2.0 percent.
    (iii) Ambient conditions sensors shielding. Ambient temperature and 
relative humidity sensors may be shielded if the ambient test 
conditions cannot be maintained within the specified tolerances because 
of warm discharge air from the condenser exhaust affecting the ambient 
measurements. If shields are used, the shields must not inhibit 
recirculation of the warm discharge air into the condenser or automatic 
commercial ice maker inlet.
    (iv) Alternate ambient conditions measurement location. For 
automatic commercial ice makers in which warm air discharge from the 
condenser exhaust affects the ambient conditions as measured 1 foot in 
front of the air inlet, or automatic commercial ice makers in which the 
air inlet is located in the rear of the automatic commercial ice maker 
and the manufacturer's specified minimum rear clearance is less than or 
equal to 1 foot, the ambient temperature and relative humidity may 
instead be measured 1 foot from the cabinet, centered with respect to 
the sides of the cabinet, for any side of the automatic commercial ice 
maker cabinet with no warm air discharge or air inlet.
    (6) Collection container for batch type automatic commercial ice 
makers with harvest rates less than or equal to 50 lb/24 h. Use an ice 
collection container as specified in section 5.5.2(a) of ANSI/ASHRAE 
Standard 29-2015, except that the water retention weight of the 
container is no more than 4.0 percent of that of the smallest batch of 
ice for which the container is used.
    (d) Test conditions--(1) Relative humidity. Maintain an average 
ambient relative humidity of 35.0 percent 5.0 percent 
throughout testing.
    (2) Water hardness. Water supplied for testing shall have a maximum 
water hardness of 180 mg/L of calcium carbonate.
    (3) Inlet water pressure. Except for portable automatic commercial 
ice makers, the inlet water pressure when water is flowing into the 
automatic commercial ice maker shall be within the allowable range 
within 5 seconds of opening the water supply valve.
    (e) Stabilization--(1) Percent difference calculation. Calculate 
the percent difference in the ice production rate between two cycles or 
samples using the following equation, where A and B are the harvest 
rates, in lb/24 h (for batch-type ice makers) or lb/15 mins (for 
continuous-type ice makers), of any cycles or samples used to determine 
stability:
[GRAPHIC] [TIFF OMITTED] TP21DE21.012

    (2) Automatic commercial ice makers with harvest rates greater than 
50 lb/24 h. The three or more consecutive cycles or samples used to 
calculate harvest rate, energy use, condenser water use, and potable 
water use, must meet the stability criteria in section 7.1.1 of ANSI/
ASHRAE Standard 29-2015.
    (3) Automatic commercial ice makers with harvest rates less than or 
equal to 50 lb/24 h. The three or more consecutive cycles or samples 
used to calculate harvest rate, energy use, condenser water use, and 
potable water use, must meet the stability criteria in section 7.1.1 of 
ANSI/ASHRAE Standard 29-2015, except that the weights of the samples 
(for continuous type ACIMs) or 24-hour calculated ice production (for 
batch type ACIMs) must not vary by more than 4 percent, and 
the 25 g (for continuous type ACIMs) and 1 kg (for batch type ACIMs) 
criteria do not apply.
    (f) Calculations. The harvest rate, energy use, condenser water 
use, and potable water use must be calculated by averaging the values 
for the three calculated samples for each respective reported metric as 
specified in section 9 of ANSI/ASHRAE Standard 29-2015. All 
intermediate calculations prior to the reported value, as applicable, 
must be performed with unrounded values.
    (g) Rounding. Round the reported values as follows: Harvest rate to 
the nearest 1 lb/24 h for harvest rates above 50 lb/24 h; harvest rate 
to the nearest 0.1 lb/24 h for harvest rates less than or equal to 50 
lb/24 h; condenser water use to the nearest 1 gal/100 lb; and energy 
use to the nearest 0.01 kWh/100 lb. Round final potable water use value 
to the nearest 0.1 gal/100 lb.
    (h) Continuous type automatic commercial ice makers--(1) Capacity 
test. Conduct the capacity test according to section 7.2.2 of ANSI/
ASHRAE Standard 29-2015, except that the ice shall be captured for 
three durations of 15.0 minutes 9.0 seconds instead of 
2.5 seconds as provided in the Standard.
    (2) Ice hardness adjustment--(i) Calorimeter constant. Determine 
the calorimeter constant according to the requirements in section A1 
and A2 of Normative Annex A Method of Calorimetry in ANSI/ASHRAE 
Standard 29-2015, except that the trials shall be conducted at an 
ambient air temperature (room temperature) of 70 [deg]F 1 
[deg]F, with an initial water temperature of 90 [deg]F 1 
[deg]F. To verify the temperature of the block of pure ice as provided 
in section A2.e in ANSI/ASHRAE Standard 29-2015, a thermocouple shall 
be embedded at approximately the geometric center of the interior of 
the block. Any water that remains on the block of ice shall be wiped 
off the surface of the block before being placed into the calorimeter.
    (ii) Ice hardness factor. Determine the ice hardness factor 
according to the requirements in section A1 and A3 of Normative Annex A 
Method of Calorimetry in ANSI/ASHRAE Standard 29-2015, except that the 
trials shall be conducted at an ambient air temperature (room 
temperature) of 70 [deg]F 1 [deg]F, with an initial water 
temperature of 90 [deg]F 1 [deg]F. The harvested ice used 
to determine the ice hardness factor shall be produced according to the 
test methods specified at Sec.  431.134. The ice hardness factor shall 
be calculated using the equation for Ice Hardness Factor in section 
5.2.2 of AHRI Standard 810-2016.
    (iii) Ice hardness adjustment calculation. Determine the reported 
energy use and reported condenser water use by multiplying the measured 
energy use or measured condenser water use by the ice hardness 
adjustment factor, determined using the following equation:

[[Page 72363]]

[GRAPHIC] [TIFF OMITTED] TP21DE21.013

    (i) Automatic commercial ice makers with automatic dispensers. 
Allow for the continuous production and dispensing of ice throughout 
testing. If an automatic commercial ice maker with an automatic 
dispenser is not able to continuously produce and dispense ice because 
of certain mechanisms within the automatic commercial ice maker that 
prohibit the continuous production and dispensing of ice throughout 
testing, those mechanisms must be overridden to the minimum extent 
which allows for the continuous production and dispensing of ice. The 
automatic commercial ice maker shall have an empty internal storage bin 
at the beginning of the test period. Collect capacity samples according 
to the requirements of ANSI/ASHRAE Standard 29-2015, except that the 
samples shall be collected through continuous use of the dispenser 
rather than in the internal storage bin. The intercepted ice samples 
shall be obtained from a container in an external ice bin that is 
filled one-half full of ice and is connected to the outlet of the ice 
dispenser through the minimal length of conduit that can be used.
    (j) Portable automatic commercial ice makers. Sections 5.4, 5.6, 
6.2, and 6.3 of ASHRAE Standard 29-2015 do not apply. Ensure that the 
ice storage bin is empty prior to the initial potable water reservoir 
fill. Fill an external container with water to be supplied to the 
portable automatic commercial ice maker water reservoir. Establish an 
initial water temperature of 70 [deg]F 1.0 [deg]F. Verify 
the initial water temperature by inserting a temperature sensor into 
approximately the geometric center of the water in the external 
container. Immediately after establishing the initial water 
temperature, fill the ice maker water reservoir to the maximum level of 
potable water as specified by the manufacturer. After the potable water 
reservoir is filled, operate the portable automatic commercial ice 
maker to produce ice into the ice storage bin until the bin is one-half 
full. One-half full for the purposes of testing portable automatic 
commercial ice makers means that half of the vertical dimension of the 
ice storage bin, based on the maximum ice fill level within the ice 
storage bin, is filled with ice. Once the ice storage bin is one-half 
full, conduct testing according to section 7 of ASHRAE Standard 29-
2015. The potable water use is equal to the sum of the weight of ice 
and any corresponding melt water collected for the capacity test as 
specified in section 7.2 of ASHRAE Standard 29-2015.
    (k) Self-contained refrigerated storage automatic commercial ice 
makers. For door openings, the door shall be in the fully open 
position, which means opening the ice storage compartment door to an 
angle of not less than 75 degrees from the closed position (or the 
maximum extent possible, if that is less than 75 degrees), for 10.0 
1.0 seconds to collect the sample. Conduct door openings 
only for ice sample collection and returning the empty ice collection 
container to the ice storage compartment (i.e., conduct two separate 
door openings, one for removing the collection container to collect the 
ice and one for replacing the collection container after collecting the 
ice).

[FR Doc. 2021-26814 Filed 12-20-21; 8:45 am]
BILLING CODE 6450-01-P