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Federal Register / Vol. 86, No. 163 / Thursday, August 26, 2021 / Notices BASIC
VAH47EC
VAH66EC
VAH87EC
VAH120EC
VAH180EC
CTIH15
CTIH25
CTIH35
CTIH50
CTIH70
2 The alternate test procedure for the LRC Coil basic models identified in paragraph 1 of this Interim Waiver Order is the test procedure for Walk-in Cooler Refrigeration Systems prescribed by DOE at 10 CFR part 431, subpart R, appendix C Appendix C to Subpart R, except as detailed below. All other requirements of Appendix C and DOEs regulations remain applicable.

MODELSContinued VRM50EC
VRM65EC 24
VRM80EC

CTE15EC
CTE25EC
CTE35EC
CTE50EC

WM15
WM25
WM35
WM50

In Appendix C to Subpart R, revise section 3.1.1 which specifies modifications to AHRI 12502009
incorporated by reference; see 431.303 to read:
3.1.1. In Table 1, Instrumentation Accuracy, refrigerant temperature measurements shall have an accuracy of 0.5 F for unit cooler in/out.
Measurements used to determine temperature or water vapor content of
the air i.e. wet bulb or dew point shall be accurate to within 0.25 F; all other temperature measurements shall be accurate to within 1.0 F.
In Appendix C to Subpart R, revise section 3.1.5 which specifies modifications to AHRI 12502009 and revise modifications to AHRI 12502009
Table 15:
3.1.5. Table 15 shall be modified to read:

TABLE 15REFRIGERATOR UNIT COOLER
Unit cooler air entering dry-bulb temperature, F

Unit cooler air entering relative humidity, %

Off Cycle Fan Power

55

Refrigeration Capacity Suction A.

55

Test description
Saturation temperature, F

Liquid inlet saturation temperature, F

Liquid inlet subcooling temperature, F

Compressor capacity
Test objective
55

Compressor Off ..

55

38

105

9

Compressor On ..

Measure fan input power during compressor off cycle.
Determine Net Refrigeration Capacity of Unit Cooler.

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Notes: Superheat to be set according to equipment specification in equipment or installation manual. If no superheat specification is given, a default superheat value of 6.5 F is shall be used. The superheat setting used in the test shall be reported as part of the standard rating.

In Appendix C to Subpart R, revise section 3.3.1 which specifies modifications to AHRI 12502009 to read:
3.3.1. For unit coolers tested alone, use test procedures described in AHRI
12502009 incorporated by reference;
see 431.303 for testing unit coolers for use in mix-match system ratings, except that for the test conditions in Tables 15
and 16, use the Suction A saturation condition test points only. Determine AWEF as described in section 3.3.7.
In Appendix C to Subpart R, revise section 3.3.3, and add sections 3.3.3.1
and 3.3.3.2 to read:
3.3.3 Evaporator fan power.
3.3.3.1 The unit cooler fan power consumption shall be measured in accordance with the requirements in Section C3.5 of AHRI 12502009. This measurement shall be made with the fan operating at full speed, either measuring unit cooler or total system power input upon the completion of the steady state test when the compressor and the condenser fan of the walk-in system are 24 LRC Coil lists VRM65 in their petition for waiver and interim waiver EERE2020BTWAV
00400011. The basic model number has been
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turned off, or by submetered measurement of the evaporator fan power during the steady state test.
Section C3.5 of AHRI 12502009 is revised to read:
Unit Cooler Fan Power Measurement.
The following shall be measured and recorded during a fan power test.

For a given motor winding configuration, the total power input shall be measured at the highest nameplated voltage. For three-phase power, voltage imbalance shall be no more than 2%.
3.3.3.2 Evaporator fan power for the off cycle is equal to the on-cycle evaporator fan power with a run time of ten percent of the off-cycle time.
EFcomp,off = 0.1 EFcomp,on
In Appendix C to Subpart R, add new section 3.3.11 to read:
3.3.11. For unit cooler systems tested alone with ducted evaporator air, or that can be installed with or without ducted evaporator air: Connect ductwork on both the inlet and outlet connections and determine external static pressure as described in ASHRAE 372009, sections 6.4 and 6.5. Use pressure measurement instrumentation as described in ASHRAE 372009 section 5.3.2. Test at the fan speed specified in manufacturer installation instructions if there is more than one fan speed setting and the installation instructions do not specify which speed to use, test at the highest speed. Conduct tests with the external static pressure equal to 50
percent of the maximum external static pressure allowed by the manufacturer for system installation within a tolerance of 0.00/+0.05 in. wc. Set the external static pressure by symmetrically restricting the outlet of the test duct. In case of conflict, these requirements for setting evaporator
modified since LRC Coils product literature lists VRM65EC and all other VRM models have an EC appended to the end of the model number.

Additionally, in a July 27, 2021 email, LRC Coil confirmed that all VAH series models should in in EC.

EFcomp,on Total electrical power input to fan motors of Unit Cooler, W
FS Fan speed s, rpm N Number of motors Pb Barometric pressure, in. Hg Tdb Dry-bulb temperature of air at inlet, F
Twb Wet-bulb temperature of air at inlet, F
V Voltage of each phase, V

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