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Federal Register / Vol. 86, No. 127 / Wednesday, July 7, 2021 / Proposed Rules
khammond on DSKJM1Z7X2PROD with PROPOSALS3

DDXDOASes in accordance with the following sections of AHRI 9202020.
a Section 3Definitions, including the references to ANSI/AHRI 10602018
incorporated by reference; see 431.95;
i Non-standard Low-static Fan Motor. A
supply fan motor that cannot maintain external static pressure as high as specified in Table 7 of AHRI 9202020 when operating at a manufacturer-specified airflow rate and that is distributed in commerce as part of an individual model within the same basic model of a DDXDOAS that is distributed in commerce with a different motor specified for testing that can maintain the required external static pressure.
b Section 5Test Requirements, including the references to sections 5.1, 5.2, 5.3, 5.5, 6.1, 6.2, 6.3, 6.4, and 7.7 not including sections 7.7.1.2, 7.7.3, and 7.7.4 of ANSI/ASHRAE 372009 incorporated by reference; see 431.95, and sections 4.4, 4.5, 4.6, 4.7, 5.1, 6.1, 6.6, 7.1, 7.2, 8.2, and 8.4 of ANSI/ASHRAE 1982013 incorporated by reference; see 431.95;
i All control settings are to remain unchanged for all Standard Rating Conditions once system set up has been completed, except as explicitly allowed or required by AHRI 9202020 or as indicated in the supplementary test instructions STI.
Component operation shall be controlled by the unit under test once the provisions in section 2.2.1c of this appendix are met.
c Section 6Rating Requirements omitting sections 6.1.2 and 6.6.1, including the references to Table 2b of ANSI/ASHRAE
372009, and ANSI/ASHRAE 1982013.
i For water-cooled DDXDOASes, the Condenser Water Entering Temperature, Cooling Tower Water conditions specified in Table 4 of AHRI 9202020 shall be used.
For water-source heat pump DDXDOASes, the Water-Source Heat Pumps conditions
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specified in Table 5 of AHRI 9202020 shall be used.
ii For water-cooled or water-source DDX
DOASes with integral pumps, set the external head pressure to 20 ft. of water column, with a 0/+1 ft. condition tolerance and a 1 ft.
operating tolerance.
iii When using the degradation coefficient method as specified in section 6.9.2 of AHRI
9202020, Equation 20 applies to DDX
DOAS without VERS, with deactivated VERS
see section 5.4.3 of AHRI 9202020, or sensible-only VERS tested under Standard Rating Conditions other than D.
iv Rounding requirements for representations are to be followed as stated in sections 6.1.2.1 through 6.1.2.8 of AHRI
9202020;
d Section 11Symbols and Subscripts, including references to ANSI/ASHRAE 1060
2018;
e Appendix AReferencesNormative;
f Appendix CANSI/ASHRAE 1982013
and ANSI/ASHRAE 37 Additions, Clarifications and ExceptionsNormative, including references to sections 5.1, 6.5, 7.3, 7.4, 7.5, 7.6, 8.6, Table 1, Table 2b, and the errata sheet of ANSI/ASHRAE 372009, ANSI/ASHRAE 41.12013 incorporated by reference; see 431.95, sections 4, 5, 6, 7.1, and 7.4 of ANSI/ASHRAE 41.62014
incorporated by reference; see 431.95, and ANSI/ASHRAE 10602018;
g Appendix ETypical Test Unit InstallationsInformative, for information only;
h Appendix FUnit Configuration for Standard Efficiency Determination Normative.
2.2.2. Optional Representations. Test provisions for the determination of the metrics indicated in paragraphs a through d of this section are optional and are determined according to the applicable provisions in section 2.2.1 of this appendix.

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For water-cooled DDXDOASes, these optional representations may be determined using either the Condenser Water Entering Temperature, Cooling Tower or the Condenser Water Entering Temperature, Chilled Water conditions specified in Table 4 of AHRI 9202020. For water-source heat pump DDXDOASes, these optional representations may be determined using either the Water-Source Heat Pumps or Water-Source Heat Pump, Ground-Source Closed Loop conditions specified in Table 5 of AHRI 9202020. The following metrics in AHRI 9202020 are optional:
a ISMRE70;
b COPFull,x:
c COPDOAS,x: and d ISMRE2 and ISCOP2 for water-cooled DDXDOASes using the Condenser Water Entering Temperature, Chilled Water conditions specified in Table 4 of AHRI 920
2020 and for water-source heat pump DDX
DOASes using the Water-Source Heat Pump, Ground-Source Closed Loop conditions specified in Table 5 of AHRI 920
2020.
2.3. Synonymous terms.
a Any references to Dedicated Outdoor Air System Unit DOAS Unit, Dedicated Outdoor Air System DOAS, and Direct Expansion Dedicated Outdoor Air System DXDOAS in AHRI 9202020 and ANSI/
ASHRAE 1982013 shall be considered synonymous with Dehumidifying Direct Expansion-Dedicated Outdoor Air System DDXDOAS as defined in 431.92.
b Any references to energy recovery or energy recovery ventilator ERV in AHRI
9202020 and ANSI/ASHRAE 1982013
shall be considered synonymous with ventilation energy recovery system VERS as defined in 431.92.
FR Doc. 202113773 Filed 7621; 8:45 am BILLING CODE 645001P

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