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Federal Register / Vol. 86, No. 151 / Tuesday, August 10, 2021 / Notices EME-05800-2

EMG-02400-5

EMG-09600-2

EMH-04800-5

EMR-02400-2

EMR-08700-5

EMT-04800-2

EME-05800-5

EMG-02900-2

EMG-09600-5

EMH-05800-2

EMR-02400-5

EMR-09600-2

EMT-04800-5

EME-07200-2

EMG-02900-5

EMG-11600-2

EMH-05800-5

EMR-02900-2

EMR-09600-5

EMT-05800-2

All these basic models with brand name: RefPlus Specific Requirements sought to be waivedPetitioning for a waiver and interim waiver to exempt CO2 Direct Expansion Unit Coolers in Medium and Low Temperature application from being tested to the current test procedure. The prescribed test procedure is not appropriate for these products for the reasons stated previously liquid inlet saturation temperature and liquid inlet subcooling temperature test condition values are not appropriate for a transcritical CO2
booster system application.

List of manufacturers of all other basic models marketing in the United States and known to the petitioner to incorporate similar design characteristics Manufacturer: Heatcraft Refrigeration Products Manufacturer: Heat Transfer Products Group HTPG
Manufacturer: Hussmann Corp. Krack Manufacturer: Keeprite Refrigeration Proposed alternate test procedure 1. Utilize the test procedure as outlined in Appendix C to Subpart R of Part 431Uniform Test Method for the Measurement of Net Capacity and AWEF of Walk-in Cooler and Walk-in
43647

Freezer Refrigeration Systems with reference to AHRI 12502009 with the exception of modifying the test conditions in Table 15 and 16 for liquid inlet saturation temperature and liquid inlet subcooling temperature as noted below. In addition, per Appendix C to Subpart R of 431 use the calculations in AHRI 1250 section 7.9 to determine AWEF and net capacity for unit coolers matched to parallel rack systems. Use AHRI 1250 Table 17, EER for Remote Commercial Refrigerated Display Merchandisers and Storage Cabinets to determine the power consumption of the system.

TABLE 15-REFRIGERATOR UNIT COOLER

35

<50

-

-

Refrigeration Capacity Suction A

35

<50

25

38

-

Compressor Measure fan Off input power during compressor off cycle.

5 Com presser Determine Net On Refrigeration Capacity of Unit Cooler.

EN10AU21.022

Off Cycle Fan Power
CO2 Liquid inlet subcooling Compressor temp, F
capacity Test objective
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Test description
Unit cooler air Unit cooler air entering CO2 Liquid entering relative Saturated inlet dry-bulb, humidity, suction saturation OF
temp, F
% temp, F