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Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules requirement to account for the performance of the energy recovery device for the Option 2 approach see section III.B.3.g of this NOPR.
DOE proposes to require testing of two basic models to validate the AEDMs for each validation classthis is identical to the requirements for other categories of commercial package airconditioning and heating equipment.
Finally, DOE proposes to specify in the table at 10 CFR 429.70c5vi a tolerance of 10 percent for DDXDOAS
verification tests for ISMRE2 and ISCOP2 when comparing test results with certified ratings. Again, this is identical to the tolerances for integrated ratings for other categories of commercial package air-conditioning and heating equipment.
Issue12: DOE requests comment on its proposals for AEDM requirements for DDXDOAS equipment. DOE requests comment specifically on whether the proposed 10-percent tolerance for comparison of test results with rated values is appropriate. If the 10-percent tolerance is not appropriate, DOE
requests comment on why it is not appropriate, as well as comment indicating an appropriate tolerance.
e. Rounding Sections 6.1.2.1 through 6.1.2.8 of AHRI 9202020 specify rounding for DDXDOAS performance metrics. DOE
proposes to adopt these rounding requirements as part of the DOE test procedure, as enumerated in section 2.2.1civ of the proposed Appendix B.
Issue13: DOE requests comment on its proposal to adopt the rounding requirements for key metrics as specified in sections 6.1.2.1 through 6.1.2.8 of AHRI 9202020.

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3. Configuration of Unit Under Test DOE recognizes that DDXDOASes are distributed in commerce in a variety of configurations consisting of different combinations of components. DOE
proposes in section 2.2.1g of Appendix B to adopt the requirements of appendix F to AHRI 9202020, which includes a list of components that must be present for testing DDXDOASes and a list of components that are optional for testing.
Appendix F in AHRI 9202020 also includes explicit instructions on how representations can be made for equipment that include these optional components. AHRI 9202020 specifies the following list of components that must be present for testing:
Supply air filters;
Compressors;
Outdoor coils or heat exchangers;

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Outdoor coil fans/motors for aircooled and air-source systems only;
Conditioning coils;
Refrigerant expansion devices;
Supply/outdoor ventilation fans/
motors, and System controls.
AHRI 9202020 also specifies that for supply air filters, the filter shall have a minimum efficiency reporting value MERV specification no less than MERV 8. For individual models that use filters with efficiency higher than MERV
8 which generally have higher pressure drop and could reduce relative tested efficiency, section F2.4 of AHRI 920
2020 allows manufacturers the option of testing these individual models as a separate basic model or combined into a basic model with other individual models that meet the basic model definition and are tested with a MERV
8 filter. Adopting Appendix F of AHRI
9202020 without changes would allow manufacturers to provide efficiency representations based on either testing option for individual models that use filters with efficiency higher than MERV
8.
DOE notes that the list of components that are optional for testing specified in section F2.4 of AHRI 9202020 includes features that may reduce tested efficiency but may also in certain applications: a Maintain or improve field efficiency or b be required for safety. Given the potential benefits, DOE
does not want to penalize equipment with such components, because that might disincentivize their adoption. By proposing to adopt Appendix F of AHRI
9202020 without changes, the following instructions from AHRI 920
2020 would specify how to make representations for individual models of equipment that include these optional features:
Individual models with features designated as optional may be represented separately as a unique basic model or certified within the same basic model as otherwise identical individual models without the feature pursuant to the definition of basic model in 431.92.
If an otherwise identical model within the same basic model without the feature is distributed in commerce, test the otherwise identical model.
If an otherwise identical model within the same basic model without the feature is not distributed in commerce, conduct tests with the feature present but configured and deactivated so as to minimize partially or totally the impact on the results of the test. Alternatively, the manufacturer may indicate in the supplemental testing instructions that the test shall be
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conducted using a specially-built otherwise identical unit that is not distributed in commerce and does not have the feature.
This approach ensures that equipment distributed in commerce with additional components outside the list of required components are still within the scope of the test procedure. The proposed approach also provides instruction on how to make representations for all component combinations including those with optional components. In addition, this approach allows manufacturers the flexibility to make representations of equipment with components designated as optional based on testing otherwise identical individual models without the feature.
C. Other Comments In response to the July 2017 ASHRAE
TP RFI, DOE received several general comments not specific to any one equipment category or test procedure.
This section addresses those comments.
NCI recommended that DOE follow the development of ASHRAE 221P, Test Method to Measure and Score the Operating Performance of an Installed Constant Volume Unitary HVAC
System, and consider where it may be appropriately applied within EPCA test procedures. NCI, No. 4 at pp. 12 NCI
stated that it has collected data indicating that typical split systems and packaged units serving residential and small commercial buildings typically deliver 50 percent to 60 percent of the rated capacity to the occupied zone, thereby making laboratory tests unrepresentative of field performance.
Id.
As noted in section I.A of this document, EPCA prescribes that the test procedures for commercial package air conditioning and heating equipment must be those generally accepted industry testing procedures or rating procedures developed or recognized by industry as referenced in ASHRAE
Standard 90.1. 42 U.S.C. 6314a4A
DOE notes that ASHRAE Standard 90.1
does not reference ANSI/ASHRAE
Standard 2212020, Test Method to Field-Measure and Score the Cooling and Heating Performance of an Installed Unitary HVAC System 34 ASHRAE
2212020 as the applicable test procedure corresponding to industry standards. NCI also did not provide data on field performance or any correlations between field performance and laboratory test performance for DX
DOASes or DDXDOASes for DOE to 34 Available at: webstore.ansi.org/tandards/
ASHRAE/ANSIASHRAEStandard2212020 Last accessed April 19, 2021.

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