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Federal Register / Vol. 86, No. 229 / Thursday, December 2, 2021 / Rules and Regulations capacity when making the comparison to the A2 cooling capacity. In appendix M1, DOE omitted the language entirely that allowed the H1N compressor speed to be lower than the speed used for the A2 test provided that the H1N capacity is no lower than the A2 cooling capacity. This document corrects these errors to reflect the appropriate compressor speed limitations for the H1N test that were adopted in the January 2017 Final Rule in both appendix M and appendix M1.
D. Reference to HSPF in Section 3.6.6 of Appendix M
The January 2017 Final Rule established the HSPF2 metric as measured per the newly created appendix M1. The HSPF2 metric is not defined for appendix M and does not apply in any section of that appendix.
Rather, the applicable heating metric for appendix M is Heating Seasonal Performance Factor HSPF. This document replaces two erroneous instances of HSPF2 with HSPF in paragraphs b and c of section 3.6.6 of appendix M.

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E. Inequality Symbols in Sections 4.1.3.2
and 4.1.4.2 of Appendix M
The January 2017 Final Rule retained testing provisions in appendix M to calculate the electrical power consumption of CAC/HPs when building load is between minimum and maximum capacity in order to satisfy the building cooling demand. For twostage CAC/HPs, section 4.1.3.2 details the case where the system operates between low k=1 compressor stage and high k=2 compressor stage in order to satisfy demand. For variable-speed CAC/HPs, section 4.1.4.2 details the case where the system operates at an intermediate compressor speed i that is between the low and high compressor speeds. In both cases, the title text for these sections reflects the intent of establishing a range of operation.
However, in the following inequalities which restate the title text, the inequality symbols were inadvertently omitted. This document adds the missing inequalities to reflect what was intended in the January 2017 Final Rule.
F. Cross-References in Sections 4.2.5.1, 4.2.5.2, and 4.2.5.3 of Appendix M and Appendix M1
The January 2017 Final Rule retained provisions in sections 4.2.5.1, 4.2.5.2, and 4.2.5.3 of appendices M and M1 for additional steps to calculate HSPF or HSPF2 in the case of appendix M1 for heat pumps having heat comfort controllers. These sections each contain a case where outdoor bin temperatures
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are greater than the maximum supply temperature, TCC, and reference section 3.1.9 of the respective appendix for calculating TCC. However, section 3.1.10
is the correct cross-reference for calculating TCC. This document corrects the cross-reference from 3.1.9 to 3.1.10
in accordance with the January 2017
Final Rule.

the boost capacity is erroneously referred using the superscript notation k=2. Elsewhere in the test procedure, the notation k=2 is used to refer to the high stage. This document corrects that error by updating the superscript to k=3 to be consistent with the intent established by the January 2017 final rule.

G. Symbol Subscripts in Section 4.2.5.1
of Appendix M and Appendix M1
Section 4.2.5.1 of both appendix M
and appendix M1 specify calculating the space heating capacity and electrical power of the heat pump, and to denote these capacities and electrical power by using the subscript hp instead of h.
Case 1 of section 4.2.5.1 of both appendices specifies determining total electrical power consumption EhTj as specified in section 4.2.1 of the same appendix, and provides an id est i.e.
statement to illustrate the replacement of subscript h with hp. Rather than state EhTj = EhpTj as intended, the subscript h was inadvertently replaced with hp on both sides of the equation. This document corrects the errors in these sections.

J. Inequality Symbol in Section 4.2.6.2 of Appendix M and Appendix M1
The January 2017 Final rule amended provisions for HSPF calculation of triple-capacity northern heat pumps in section 4.2.6. The title of section 4.2.6.2
describes cases where the heat pump operates at high k=2 compressor capacity at temperature Tj and its capacity is greater than or equal to the building load i.e., building load is less than or equal to the compressor capacity. In the inequality immediately following, the building load is listed first, and a less than symbol < is erroneously used rather than a less than or equal to symbol . This document corrects the symbol using
to indicate a building load less than or equal to capacity, to be consistent with the intent of the section title as established by the January 2017 Final Rule.

H. Inequality Symbol in Section 4.2.5.1
of Appendix M and Appendix M1
In sections 4.2.5.1, 4.2.5.2, and 4.2.5.3
of both appendix M and appendix M1, Case 1 of each section covers instances where supply air temperature is greater than or equal to the comfort controller maximum supply temperature i.e., ToTj Tcc. Case 2 covers the complimentary scenario where supply air temperature is less than the comfort controller maximum supply temperature i.e., ToTj < Tcc, such that collectively the two Cases cover the full range of possible supply air temperatures in comparison to the comfort controller maximum supply temperature. In section 4.2.5.1 of both appendices, the less than symbol in Case 2 was inadvertently codified as a greater than symbol. This document corrects this symbol to less than..
I. Symbol Superscript in Section 4.2.6.c of Appendix M and Appendix M1
The January 2017 Final Rule established provisions for testing of triple-capacity northern heat pumps, which utilize a third distinct stage of heating capacitydenoted as boost or boosterthat is higher than both the high and low stages. Section 4.2.6
of both appendix M and appendix M1
describes additional steps for HSPF
calculation for triple-capacity northern heat pumps, referring to boost capacity with the superscript notation k=3 in all but one instance: In section 4.2.6.c,
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K. Reference To Booster Capacity in Section 4.2.6.3 of Appendix M and Appendix M1
As discussed in paragraph I, the January 2017 Final rule established provisions for HSPF calculation of triple-capacity northern heat pumps in section 4.2.6. Section 4.2.6.3 describes cases where the heat pump operates at the k=3 compressor capacity i.e., boost capacity at temperature Tj and its capacity is greater than or equal to the building load. The title of this section erroneously refers to the k=3
compressor capacity as high. Instead, the k=3 compressor capacity should be referred to as the booster capacity the high k=2 capacity is covered by section 4.2.6.2. This document corrects the title of section 4.2.6.3 to be consistent with the intent established by the January 2017 Final Rule.
L. Missing Word Minimum in Section 1.2 of Appendix M1
In the January 2017 Final rule, DOE
proposed a definition for minimumspeed-limiting variable-speed heat pump to refer to heat pumps that vary the minimum compressor speed when operating in outdoor temperatures that are in the range for which the minimum speed performance factors into the HSPF calculation i.e., between 35 F
and 62 F. 82 FR 1426, 1458. However,
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