Federal Register - October 12, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 194 / Tuesday, October 12, 2021 / Rules and Regulations
1440xKxEP1
Tl
f EP2i - EP1
6.
1
ET=
VerDate Sep<11>2014
17:22 Oct 08, 2021
-
Tl
Jkt 253001
F x cTM,i - CTi,i
X
K
+ CTi,i F = ratio of per day energy consumption in excess of the least energy and the maximum difference in per-day energy consumption and is equal to 0.20.
e In place of section 5.8.2.1.6 of HRF1
2019, use the calculations provided in this section. For units with long-time automatic defrost control and variable defrost control with multiple defrost cycle types, the twopart test method in section 5.7.2.1 of HRF
12019 shall be used, and the test cycle energy shall be calculated as:
+ EPZ,-EPlx T; xcrxK
D
T2-
CTi ,l X CTM.,l
CT=
F x cTM.,l - CTi ,l
+ CTi ,l
Where:
CTL,i = the least or shortest compressor run time between instances of the defrost
PO 00000
12
CTi
CTi ,l X CTM.,l
12 = factor to adjust for a 50-percent run time of the compressor in hours per day.
i For long-time automatic defrost control, CTi shall be equal to a fixed time in hours rounded to the nearest tenth of an hour. For cases in which there are more than one fixed CT value for a given defrost cycle type, an average fixed CT value shall be selected for this cycle type.
ii For variable defrost control, CTi shall be calculated equivalent to:
1
X
T2i = length of time in minutes of the second part of the test for compressor system i;
CTi = compressor run time between defrosts of compressor system i, rounded to the nearest tenth of an hour, for long-time automatic defrost control equal to a fixed time in hours, and for variable defrost control equal to:
CTM,i = for compressor system i, the maximum compressor-on time between defrost heater-on events used in the variable defrost control algorithm greater than CTL,i but not more than 96
hours, in hours rounded to the nearest tenth of an hour;
For defrost cycle types with no values of CTL
and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively.
1440 x K x EP1
Where:
ET, 1440, 12, and K are defined in section 5.3a of this appendix;
EP1, and T1 are defined in section 5.3a of this appendix;
i = a subscript variable that can equal 1, 2, or more that identifies the distinct defrost cycle types applicable for the product;
D = the total number of defrost cycle types;
EP2i = energy expended in kilowatt-hours during the second part of the test for defrost cycle type i;
T2i = length of time in minutes of the second part of the test for defrost cycle type i;
CTi = defrost timer run time or compressor run time between instances of defrost cycle type i, rounded to the nearest tenth of an hour;
T2
Tli
compressor system that has automatic defrost;
D = the total number of compressor systems with automatic defrost;
EP2i = energy expended in kilowatt-hours during the second part of the test for compressor system i;
CT-
Where:
CTL,i = for compressor system i, the shortest cumulative compressor-on time between defrost heater-on events used in the variable defrost control algorithm CTL
for the compressor system with the longest compressor run time between defrosts must be greater than or equal to 6 but less than or equal to 12 hours, in hours rounded to the nearest tenth of an hour;
X
Frm 00035
Fmt 4701
Sfmt 4700
12
l
cycle type i in hours rounded to the nearest tenth of an hour CTL for the defrost cycle type with the longest compressor run time between defrosts must be greater than or equal to 6 but less than or equal to 12 hours;
CTM,i = the maximum compressor run time between instances of defrost cycle type i in hours rounded to the nearest tenth of an hour greater than CTL,i but not more than 96 hours;
For cases in which there are more than one CTM and/or CTL value for a given defrost cycle type, an average of the CTM and CTL values shall be selected for this defrost cycle type. For defrost cycle types with no values of CTL and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively.
E:FRFM12OCR2.SGM
12OCR2
ER12OC21.006
Where:
ET, 1440, 12, and K are defined in section 5.3a of this appendix;
EP1, and T1 are defined in section 5.3a of this appendix;
i = a subscript variable that can equal 1, 2, or more that identifies each individual
+
ER12OC21.005
=
ER12OC21.003 ER12OC21.004
ET
F = ratio of per day energy consumption in excess of the least energy and the maximum difference in per-day energy consumption and is equal to 0.20.
d In place of section 5.8.2.1.5 of HRF1
2019, use the calculations provided in this section. For multiple-compressor products with automatic defrost, the two-part test method in section 5.7.2.1 of HRF12019
shall be used, and the test cycle energy shall be calculated as:
ER12OC21.002
Where:
CTL = the least or shortest compressor run time between defrosts used in the variable defrost control algorithm greater than or equal to 6 but less than or equal to 12 hours, or the shortest compressor run time between defrosts observed for the test if it is shorter than the shortest run time used in the control
algorithm and is greater than 6 hours, or 6 hours if the shortest observed run time is less than 6 hours, in hours rounded to the nearest tenth of an hour;
CTM = the maximum compressor run time between defrosts in hours rounded to the nearest tenth of an hour greater than CTL but not more than 96 hours;
For variable defrost models with no values of CTL and CTM in the algorithm, the default values of 6 and 96 shall be used, respectively.
56823
