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khammond on DSKJM1Z7X2PROD with PROPOSALS3

Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules DOASes still referred to in AHRI 920
2020 as simply DXDOASes.
DOE is proposing to incorporate by reference the revised industry test standard, AHRI 9202020, with certain modifications that are consistent with the industry test standard. DOE has tentatively concluded that the proposed test procedure in this NOPR would not add undue industry test burden, and that the proposed test procedure for this equipment is consistent with the industry test procedure update. Further discussion of the cost impacts of the proposed test procedure are presented in the following paragraphs.
As noted previously, currently DOE
does not prescribe test procedures for DDXDOASes, and AHRI 9202020 is the most recent version of the industry test procedure applicable to DDX
DOASes. DOE has tentatively determined that the proposal to incorporate by reference AHRI 920
2020 is consistent with current industry practice, and, therefore, manufacturers would not be expected to incur any additional costs if the proposal were finalized. Importantly, the proposals in this NOPR, if finalized, would not require manufacturers to certify ratings to DOE. DOE would address certification as part of any rulemaking to address energy conservation standards for DDXDOASes.
With that said, DOE is proposing to define dehumidifying direct expansion-dedicated outdoor air system DDXDOAS based on the definition provided in AHRI 9202020.
The differences in the proposed definition as compared to the definition in AHRI 9202020 are to provide clarity and use terminology consistent with DOEs test procedures for other categories of commercial package air conditioning and heating equipment.
DOE is proposing to limit the applicability of the proposed test procedure to DDXDOASes with any MRC less than 324 lbs. of moisture per hour, whereas the scope of AHRI 920
2020 is not limited based on MRC. In a comment provided in response to the July 2017 ASHRAE TP RFI, AHRI stated that laboratory limitations may limit testing using ANSI/AHRI 9202015 to 300 lbs. of moisture per hour at Standard Rating Condition A and to units not physically larger than more typical commercial package air conditioning equipment with a capacity of 760,000 Btu per hour. AHRI, No. 11
at p. 20 As discussed in section III.A.3
of this document, DOEs proposal to limit the coverage of DDXDOASes to 324 lbs. of moisture per hour in the DDXDOAS definition is a direct conversion from the maximum cooling
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capacity limit of 760,000 Btu per hour which AHRI notes would be the upper limit for laboratory capabilities, and it is similar to the suggestion made by AHRI. Hence the definitional modifications to the industry standard will not change the scope of coverage of the proposed test procedure as compared to the industry standard, and if made final, would not result in any increase in test burden as compared to AHRI 9202020.
AHRI 9202020 does not explicitly state the amount of external head pressure to use when testing watercooled and water-source DDXDOASes with integral pumps. As noted, there are a very limited number of DDXDOAS
models with integral pumps on the market. DOE is proposing to require such units be tested with an external head pressure equal to 20 0/+1 feet of water column, which is the same level of external head pressure used in the calculation of the pump effect for DDX
DOASes without integral pumps. As such, DOE considers this proposal to be consistent with industry test procedure because it ensures that integral pumps are treated in the same way as nonintegral pumps, and as such would not increase testing burden as compared to current industry practice.
AHRI 9202020 also does not explicitly provide directions for setting up the units control settings at each Standard Rating Condition. As discussed in section III.B.3.g of this document, DOE is proposing a general requirement for all control settings to remain unchanged for all Standard Rating Conditions once system set up has been completed, and that component operation shall be controlled by the unit under test once the provisions for rating requirements are met. This is likely how DDXDOASes would be tested as per the existing instructions in AHRI 9202020, but DOE is providing the additional specificity in order to ensure that the results of the testing are representative, repeatable, and reproducible, and as such would not increase testing burden as compared to current industry practice.
AHRI 9202020 incorrectly indicates that Equation 20 should be used to calculate the degradation coefficient for DDXDOASes with VERS because Equation 21 is indicated to apply for DDXDOASes with VERS. This is discussed in further detail in section III.B.3.l.ii of this document. DOE is proposing to correct this statement to instead use this equation for DDX
DOASes without VERS, with deactivated VERS, or with sensible-only VERS tested under Standard Rating
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Conditions other than D. DOE considers this proposal to be consistent with the intent of the industry test procedure and would not increase testing burden as compared to AHRI 9202020.
DOEs proposal to provide a definition for non-standard low-static fan motor also serves to provide clarity to the instructions present in AHRI 920
2020 without affecting the scope of coverage or testing burden. Absent this definition, as discussed in section III.B.3.l.iii of this document, it is not possible to determine the appropriate airflow setting procedure in section 6.1.5.2 of AHRI 9202020.
AHRI 9202020 does not provide instruction for testing a DDXDOAS for which a manufacturer recommends more than one refrigerant option. DOE
is proposing to require testing of such a unit with each recommended refrigerant if the different refrigerants require different hardware. This proposal is consistent with the treatment of basic models of commercial packaged air conditioners and heating equipment under 10 CFR 430.92, and, as such, it would be reflective of industry practice for commercial packaged air conditioner and heating equipment generally.
Therefore, this proposed addition to the procedure laid out by AHRI 9202020
would not increase testing burden as compared current industry practice.
DOE is also proposing sampling requirements for making representations of ISMRE2 and ISCOP2, as applicable.
AHRI 9202020 does not contain comparable provisions. The sampling requirements proposed are consistent with the DOE sampling requirements generally for commercial packaged air conditioners and heating equipment, and, if made final, would be reflective of industry practice. Therefore, the proposed sampling requirements, if made final, would not increase testing burden as compared to the current industry practice.
Issue14: DOE requests comment on its understanding of the impact of the test procedure proposals in this NOPR, specifically DOEs initial conclusion that manufacturers would not incur any additional costs due to this proposal, if finalized, compared to current industry practice, as indicated by AHRI 920
2020.
4. Harmonization With Industry Standards DOE proposes to incorporate by reference the provisions in AHRI 920
2020, including definitions, test methods, and rating requirements, with certain modifications previously discussed. Throughout this NOPR, DOE
discusses adopting this most recent
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