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Federal Register / Vol. 86, No. 132 / Wednesday, July 14, 2021 / Rules and Regulations
37005

Pump Equipment AHRI 340/360
2019.6

TABLE III.1 IEER TEST CONDITIONS FOR WATER-COOLED AND EVAPORATIVELY-COOLED AIR CONDITIONERS FROM AHRI
340/3602019
Water-cooled Percent load
100
75
50
25

Entering water temperature F
85.0
73.5
62.0
55.0

Entering air wet-bulb temperature F

Entering air dry-bulb temperature 7 F

95.0
81.5
68.0
65.0

75.0
66.2
57.5
52.8

Makeup water temperature F
85.0
81.5
68.0
65.0

has evaluated the appropriate condenser entering air dry-bulb and wet-bulb temperatures for the climates in which ECUACs are typically installed. CA
IOUs, No. 13 at p. 2
Regarding WCUACs, CA IOUs stated that if DOE were to adopt IEER, DOE
should complete the test procedure rulemaking first and consider aligning the temperature test points and weighting factors with those of watercooled variable refrigerant flow VRF
equipment. CA IOUs, No. 13 at p. 2;
Public Webinar Transcript,4 No. 10 at p.
21.
For the reasons provided previously and presented in the September 2020
NOPD, DOE is maintaining federal standards for ECUACs and WCUACs in terms of EER.
DOEs analysis in support of the final determination is based on an evaluation of ECUACs and WCUACs in terms of EER.

The intent of this weighted average across a range of condenser temperatures is to produce an IEER
rating that is more representative of outdoor conditions that air conditioners face for much of the year, rather than just the peak temperature experienced in most climates for only a small minority of operating hours.
In the September 2020 NOPD, DOE
proposed to maintain standards for ECUACs and WCUACs in terms of EER
because the current IEER metric may not be representative for ECUACs and WCUACs and compliance with IEER
would impose additional testing and certification burden on a small market.
85 FR 57149, 57161. DOE initially determined that for ECUACs, the weighting factors for IEER may not be representative of typical applications.
ECUACs may be disproportionately marketed and sold in relatively hot and dry climates where there is a larger efficiency benefit to using evaporative condenser cooling. 85 FR 57149, 57160.
The IEER equation assigns a weighting factor of just 2 percent for the full-load test point, so almost all of the IEER
rating for ECUACs would reflect
performance at outdoor air temperatures which is cooler than what would typically be experienced in the hot and dry climates where this equipment is installed. For ECUACs with cooling capacity less than 65,000 Btu/h DOEs preliminary analysis suggested that these units are primarily marketed for residential applications, whereas the IEER metric was developed for commercial applications by analyzing air conditioner energy use in commercial buildings. Id. For WCUACs, it is not certain whether the IEER
weighting factors appropriately reflect the average use of WCUACs given that IEER was developed based on an analysis of air-cooled CUACs ACUACs. Id.
Additionally, IEER requires at least four tests whereas EER requires a single test. Examining the models listed in the CCMS database, DOE found that many models did not have any online product literature demonstrating that they are rated with IEER, suggesting that many WCUAC and ECUAC models would need to be retested in order to comply with Federal IEER standards. 85 FR
57149, 57161.
In response to the September 2020
NOPD, DOE received several comments in support of its proposal to maintain standards in terms of the EER metric.
UCA supported DOEs proposal to maintain the EER metric for WCUACs, stating that they disagreed with using IEER for certain WCUACs installed indoors within mechanical rooms because these units typically see constant water temperatures year-round.
UCA, No. 11 at p. 1 CA IOUs supported maintaining EER and not adopting IEER for ECUACs until the test procedure has been updated and DOE

DOE develops information in the market analysis that provides an overall picture of the market for the equipment concerned. For this final determination, DOE conducted a review of the current market for ECUACs and WCUACs, including equipment literature, the AHRI Directory of Certified Product Performance AHRI Directory,8 and the DOE Compliance Certification Management System CCMS
database.9 DOE also considered market data and stakeholder comments received in response to the July 2019
ECS RFI and the September 2020 NOPD, the analysis performed in the previous standards rulemaking for ECUACs and WCUACs, and the energy savings
6 AHRI 340/3602019 is the industry test procedure referenced in ASHRAE 90.12019 for testing CUACs with cooling capacity greater than or equal to 65,000 Btu/h.
7 UCA pointed out a typographical error in Table III.6 in the September 2020 NOPD see 85 FR 57149, 57159, in which the entering air dry-bulb temperature should be a test condition for ECUACs
and not WCUACs. UCA, No. 11 at p. 1 This has been corrected in Table III.1 of this final determination.
8 The AHRI Directory for unitary large equipment can be found at https www.ahridirectory.org/
Search/SearchHome. AHRIs certification program does not currently include ECUACs of any cooling
capacities or WCUACs with cooling capacity greater than 250,000 Btu/h.
9 Data from the DOE CCMS database used in the September 2020 NOPD and this final determination was accessed on December 16, 2019. This database can be found at http www.regulations.doe.gov/
certification-data/.

The following equation shows the weighting factors for each testing condition.
IIIIIIII = 0.020 A + 0.617 B +
0.238 C + 0.125 D
Where see Table III.1 for condenser temperature for all four test points:
A = EER, Btu/Wh, at 100 percent capacity at standard rating conditions B = EER, Btu/Wh, at 75 percent capacity and reduced condenser temperature C = EER, Btu/Wh, at 50 percent capacity and reduced condenser temperature D = EER, Btu/Wh, at 25 percent capacity and reduced condenser temperature.

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