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2.1.1. Section 3Definitions Except Section 3.10Definition of Critical Parameters, 2.1.2. Section 5Test Requirements Except Sections 5.1.2.1, 5.1.2.2, and 5.1.2.3Control Settings, 2.1.3. Section 6Rating Requirements Except Section 6.3.3Allowable Critical Parameter Adjustments and Section 6.5
Simultaneous Cooling and Heating Efficiency and Capacity Ratings, 2.1.4. Section 11Calculations, 2.1.5. Section 12Symbols, Subscripts and Superscripts, 2.1.6. Appendix EANSI/ASHRAE 37
2009 Clarifications/ExceptionsNormative Note: The controls verification procedure specified in Appendix C of AHRI 12302021
is referenced as part of DOEs certification provisions at 429.43b and product-specific enforcement provisions located at 429.134s3.
2.2. Excepted sections of ANSI/ASHRAE
372009 including Errata Sheet issued October 3, 2016
2.2.1. Section 1Purpose 2.2.2. Section 2Scope 2.2.3. Section 4Classifications Sections 3 through 5 of this appendix provide additional instructions for determining IEER and COP. In cases where there is a conflict, the language of this appendix takes highest precedence, followed by AHRI 12302021, followed by ANSI/
ASHRAE 372009 including Errata Sheet issued October 3, 2016.
3. Definitions 3.1. Critical Parameters are the following settings of modulating components of variable refrigerant flow multi-split air conditioners and heat pumps: compressor speeds, outdoor fan speeds and outdoor variable valve positions.
4. Test Conditions 4.1 Test Conditions for air-cooled VRF
multi-split systems with rated cooling capacity greater than 65,000 Btu/h. When testing to certify to the energy conservation standards in 431.97, test using the Standard Rating Conditions, Cooling and Standard Rating Part-Load Conditions IEER conditions for cooling mode tests and Standard Rating Conditions High Temperature Steady-state Test for Heating conditions for heat pump heating mode tests, as specified in Table 9 of AHRI 12302021.
4.1.1 Representations of COP for aircooled VRF multi-split systems with rated cooling capacity greater than 65,000 Btu/h made using the Low Temperature Operation, Heating condition specified in Table 9 of AHRI 12302021 are optional.
4.2 Test Conditions for water-source VRF
multi-split systems. When testing to certify to the energy conservation standards in
431.97, test using the Part-load Conditions IEER conditions specified for Water Loop Heat Pumps in Table 10 of AHRI 12302021
for cooling mode tests and the Standard Rating Test conditions specified for Water Loop Heat Pumps in Table 11 of AHRI
12302021 for heat pump heating mode tests.
4.2.1 For water-source VRF multi-split systems, representations of EER made using the Standard Rating Test conditions specified for Ground-loop Heat pumps in Table 10 of AHRI 12302021 and representations of COP made using the Standard Rating Test conditions specified for Ground-loop Heat Pumps in Table 11
of AHRI 12302021 are optional.
5. Test Procedure 5.1 Control Settings. Control settings must be set in accordance with sections 5.1.3, 5.1.4, 5.1.5, and 5.2 of AHRI 12302021. For units equipped with head pressure controls, the head pressure controls must be set per manufacturer installation instructions or per factory settings if no instructions are provided. Indoor airflow-control settings must be set in accordance with Section 6.3.1
of AHRI 12302021. At each load point, critical parameters must be set to the values certified in the STI. In cases where a certified critical parameter value is not in the STI, the system must operate per commands from the system controls for that parameter. Once set, control settings must remain unchanged for the remainder of the test except for allowable adjustment of critical parameters as described in section 5.2 of this appendix.
5.2 Allowable Critical Parameter Adjustments for IEER cooling tests. The following sections describe allowable adjustments to critical parameters after the initial system setup during which all control settings, including certified critical parameters, are set. Adjust critical parameters in order to achieve fulland partload cooling capacity targets and SHR limits.
5.2.1 Critical Parameter Adjustments for Meeting Cooling Capacity Targets. Once critical parameters have been set to the values certified in the STI, if the unit cannot operate within 3% of the target cooling capacity i.e., within 3% of the load fraction for a given part-load cooling test 75%, 50%, or 25% load or within 3% of the certified cooling capacity for a 100% full-load cooling test, manually-controlled critical parameters must be adjusted according to the following provisions:
5.2.1.1. Cooling Capacity is Below Lower Tolerance. If, for any test, the cooling capacity operates below the lower tolerance for the target cooling capacity, increase the compressor speeds beyond the STI-certified values until the cooling capacity operates within 3% of the target cooling capacity. If multiple compressors are present in the
Where:
i identifies the critical parametereither compressors speeds, outdoor fan
speeds, or outdoor variable valve positions CPi,Adj = The adjusted position of critical parameter i, recorded at each measurement interval. If multiple
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system, increase compressor speed by the same absolute increment in RPM or Hz for each compressor for which the following conditions apply:
1 The STI specifies a non-zero compressor speed for the compressor for that test and 2 The compressor has not yet reached its maximum capable operating speed. The compressor speeds must not be less than the STI-certified values at any point during the test. Upward adjustments to compressor speed are not constrained by a budget on RSS
Points Total See section 5.2.1.2.1 of this appendix.
5.2.1.2 Cooling Capacity is Above Upper Tolerance. If, for any test, the cooling capacity operates above the upper tolerance for the target cooling capacity, adjust any manually-controlled critical parameters per the STI. If the STI does not include a hierarchy of instructions for adjustment of critical parameters to reduce cooling capacity during IEER cooling tests, then reduce only the compressor speeds to reduce cooling capacity. If multiple compressors are present in the system, decrease compressor speed by the same absolute increment for each compressor for which the following conditions apply:
1 The STI specifies a non-zero compressor speed for the compressor for that test and 2 The compressor has not yet reached minimum speed. Continue reducing cooling capacity in this manner until one of the following occurs:
i The unit operates within 3% of the target cooling capacity; or ii The RSS point total reaches a budget of 70 points See section 5.2.1.2.1 of this appendix. For the 75%, 50% and 25% partload cooling test points, if the RSS point total reaches 70 during critical parameter adjustments before the capacity operates within 3% of the target cooling capacity, stop adjustment and follow cyclic degradation procedures in accordance with Section 11.2.2.1 of AHRI 12302021.
5.2.1.2.1 Measuring Critical Parameter Variation During Adjustment Period. When adjusting critical parameters to reduce cooling capacity, critical parameter variation must be calculated each time the critical parameters are adjusted, using the following equations:
First, use equation 5.21 to calculate the absolute parameter percent difference PPDi between each adjusted critical parameter and the value for that parameter certified in the supplemental testing instructions provided by the manufacturer pursuant to 429.43b4 of this chapter STI.

components corresponding to a single parameter are present e.g., multiple compressors, calculate the average position across all components corresponding to that parameter at each
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Federal Register / Vol. 86, No. 235 / Friday, December 10, 2021 / Proposed Rules