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Federal Register / Vol. 86, No. 235 / Friday, December 10, 2021 / Proposed Rules ii If the manufacturer certifies in accordance with 429.43b4 that A Indoor unit models in a tested combination within a basic model include both individual indoor unit models distributed in commerce with a specific component and otherwise identical individual indoor unit models distributed in commerce without the specific component, and B Represented values for the tested combination are based on performance of individual indoor unit models distributed in commerce without the specific component, DOE will test the tested combination with otherwise identical indoor unit models within the tested combination within a basic model that do not include the component, except in either of the following situations. In either of the following situations, DOE may test the tested combination with individual indoor unit models with the specific component present and consistent with any component-specific test provisions specified in section 6 of appendix D1 to subpart F of part 431.
1 DOE is not able, through documented reasonable effort, to obtain individual indoor unit models for testing that do not include the component.
2 DOE becomes aware that the manufacturers certification in accordance with 429.43b4 regarding specific components is invalid.
2 Manufacturer involvement in assessment or enforcement testing. A
manufacturers representative will be allowed to support commissioning and witness assessment and/or enforcement testing for variable refrigerant flow multi-split air conditioners and heat pumps, including during the controls verification procedures CVPs, specified in paragraph s3 of this section, with allowance for additional involvement as described in the following provisions.
i Manufacturer involvement in CVPControl settings must be set by a member of the third-party laboratory and per the provisions in section 5.1 of appendix D1 to subpart F of part 431.
Critical parameters must operate automatically from the system controls and must not be manually controlled or adjusted at any point during the CVP.
The manufacturers representative must not make any adjustments to the VRF
multi-split system for a CVP.
ii Manufacturer involvement in heating tests and IEER cooling testsAll control settings other than critical parameters must be set by a member of the third-party laboratory, following the provisions of section 5.1 of appendix D1
to subpart F of part 431. Critical
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parameters may be manually controlled by a manufacturers representative, including initial setting to the certified values and additional adjustments as described in sections 5.1 and 5.2 of appendix D1 to subpart F of part 431, respectively. Setting and adjustment of critical parameters by a manufacturers representative must be monitored by third-party laboratory personnel using a service tool. The manufacturers representative must not make any other adjustments to the VRF multi-split system under test. If a manufacturers representative is not present for testing, a member of the third-party laboratory must set and adjust critical parameters using the provided means of control described in 429.110b1iv for enforcement testing and 429.104 for assessment testing.
3 Controls Verification Procedure CVP. This procedure validates the certified values of critical parameters for which positions may be manually set during the fulland part-load IEER
cooling test conditions specified at appendix D1 to subpart F of part 431.
The CVP will only be conducted for a single system.
i Conducting the CVPThe CVP
will be conducted at all of the four IEER
cooling test conditions as specified in appendix D1 to subpart F of part 431;
the CVP is not applicable for any heating test conditions. The CVP will first be performed at the full-load cooling condition before being conducted at part-load cooling conditions and must be conducted per Appendix C of AHRI 12302021
incorporated by reference, see 429.4.
ii Validating Critical ParametersAt each load point, certified critical parameter values will be validated or invalidated according to Section C6 of AHRI 12302021 with the following amendments:
A The duration of the period used for validating certified critical parameter values must be whichever of the following is longer: Three minutes, or the time period needed to obtain five sample readings while meeting the minimum data collection interval requirements of Table C2 of AHRI 1230
2021.
B If at least one measurement period with duration identified in paragraph s3iiA of this section exists before tOFF that has an average root-sum-square RSS points total as defined in Section 3.26 of AHRI 12302021 over the measurement period that is less than or equal to 70 points, the certified critical parameter values are valid.
C If no measurement period with duration identified in paragraph s3iiA of this section exists before
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tOFF that has an average RSS points total over the measurement period that is less than or equal to 70 points, the certified critical parameter values are invalid.
iii Determining critical parameters for use in steady-state IEER cooling testsIf, following a CVP, IEER testing is conducted per appendix D1 to subpart F of part 431, the following provisions apply:
A Validated critical parameter settings. At each load point, if certified critical parameter values are found to be valid according to the results of the CVP, initially set critical parameters to their certified values for the IEER test at the corresponding fullor part-load cooling condition. Perform additional adjustments to critical parameters as described in section 5.2 of appendix D1
to subpart F of part 431.
B Invalidated critical parameter settings. At each load point, if certified critical parameter values are found to be invalid according to the results of the CVP, determine alternate critical parameter values for use in the corresponding IEER test as specified in appendix D1 to subpart F of part 431.
Determine alternate critical parameter values from the CVP results of the single system described in paragraph s3 of this section as follows:
1 Select the CVP measurement periodthis period must have duration determined per paragraph s3iiA of this section and must be the period where the RSS points total has a lower average value over the measurement period than over any other time period in the CVP of the same duration. If multiple periods exist with the same RSS points total, select the measurement period closest to but before the time that the first indoor unit switches to thermally inactive denoted as toff in AHRI 12302021.
2 Determine alternate critical parameterscalculate the average position for each critical parameter during the measurement period selected in paragraph s3iiiB1 of this section. When initially setting critical parameters per section 5.1 of appendix D1 to subpart F of part 431, instead of using the certified critical parameter values, use the alternate critical parameter values as control inputs. The same initial alternate critical parameter values must be used for all systems in the assessment/enforcement sample though critical parameter adjustments as needed to achieve target capacity or sensible heat ratio SHR limits are made independently for each tested system, per paragraph s3iiiB3 of this section.
3 For each system, determine whether critical parameter adjustments
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