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Federal Register / Vol. 86, No. 193 / Friday, October 8, 2021 / Rules and Regulations
electronic switch, DOE proposed the following changes to appendix D1 and appendix D2 in the July 2019 NOPR:
Replace the symbols PIA and POFF, for measuring inactive mode 41 and off mode, respectively, with Pdefault and Plowest, including revisions to the calculation symbols in section 3.6.1 of appendix D1 and 3.5.1 of appendix D2.
Pdefault represents the low-power measurement if only one power level is observed. If two power levels are observed, Plowest represents the off mode power measurement and Pdefault represents the inactive mode power measurement.
For clothes dryers with both an inactive mode and off mode i.e., clothes dryers with electronic controls that offer an optional switch or other means that can be selected by the end user to achieve a lower power state than the default inactive/off mode state,42
section 3.6.2 of appendix D1 and 3.5.2
of appendix D2 require that, after performing the measurement in section 3.6.1 of appendix D1 or 3.5.1 of appendix D2, the switch or other means be activated to the position resulting in the lowest power consumption and the measurement procedure described in section 3.6.1 and 3.5.1, respectively, be repeated. Measure and record the average power consumption as the lowest standby/off mode power, Plowest, in watts.
Revise section 3.6 of appendix D1
and newly renumbered section 3.5 of appendix D2 to state that for a clothes dryer that takes time to automatically enter a stable inactive/off mode state from a higher power state, as discussed in Section 5, Paragraph 5.1, note 1 of IEC Standard 62301, allow sufficient time for the clothes dryer to automatically reach the default inactive/
off mode state before proceeding with the test measurement. Replace the term lower power state with default standby/off mode state, recognizing that the lower power state that the clothes dryer reaches by default may be either a standby inactive mode or an off mode.
Perform standby mode and off mode testing after completion of an active mode drying cycle; after removing the test load; without changing the control panel settings used for the active mode drying cycle; with the door closed; and without disconnecting the electrical energy supply to the clothes dryer. DOE noted that the order of sections within the clothes dryer test procedures suggests 41 Inactive mode is the only type of standby mode required to be measured in appendix D1 and appendix D2.

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that the standby mode and off mode measurement section 3.6 of appendix D1 and section 3.5 of appendix D2 is performed after the active mode test cycle sections 3.3 through 3.5 of appendix D1 and sections 3.3 and 3.4 of appendix D2; therefore, the proposed approach likely reflects current practice within the industry. 84 FR 35484, 3549535496 July 23, 2019.
AHAM supported the proposal to amend the clothes dryer test procedures to use nomenclature, symbols, and structure, procedural instructions, and assigned annual hours based on observable and measurable characteristics of the clothes dryer, rather than based on knowledge of the control panel switch type or internal functionality of the clothes dryers.
AHAM supported DOEs proposed modification to the sequence of testing for standby or off mode power measurement to perform the standby mode and off mode testing after the active mode testing, which reflects current practice by test laboratories.
AHAM, No. 33 at p. 9
In this final rule, DOE is amending the test procedure in accordance with the proposals outlined above, adding new symbols to represent the default and lowest standby power measurements, along with instructions for their applications based on observable characteristics of the clothes dryer. DOE is also amending appendix D1 and appendix D2 to specify that inactive and off mode tests must be performed after completion of an active mode drying cycle, and the unit must be allowed sufficient time to automatically reach its default inactive/off mode power state before performing measurements. Under the revised section 3.6 of appendix D1 and newly renumbered section 3.5 of appendix D2, DOE is requiring that the same sequence of measurements be performed as in the previous section 3.6 in both appendix D1 and appendix D2, to yield the same power measurements for clothes dryers with inactive mode, off mode, or both. Further, DOE is specifying that the same annual hours that were previously specified shall be applied to the average power measurements in section 4.5 of both appendix D1 and appendix D2.
DOE has determined that these amendments to appendix D1 and appendix D2 will not impact the measured efficiency of clothes dryers, because the amendments are amendments to nomenclature and provide additional direction.

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3. General Test Procedure Provisions at 10 CFR 430.23d The general test procedure provisions for clothes dryers in 10 CFR 430.23d include methods for calculating the estimated annual operating cost, CEF, and other useful measures of energy consumption using appendix D1. In the July 2019 NOPR, DOE proposed to amend the test procedure to provide explicitly for calculating each of these metrics using appendix D2 as well as to include methods of calculating the estimated annual energy use.
AHAM and the Joint Commenters supported DOEs proposal to extend calculations of energy consumption to appendix D2 and to add a new calculation of annual energy use, stating that this would ensure consistency in the test procedure. AHAM, No. 33 at p.
9; Joint Commenters, No. 34 at p. 3
DOE is adopting the test procedure amendments as proposed in the July 2019 NOPR to provide explicitly for the calculation of useful measures of energy consumption, including estimated annual energy use, using appendix D2.
4. Rounding Requirements for Reported Values In the July 2019 NOPR, DOE proposed adding a new section at 10 CFR
429.21c to specify the rounding requirements of all numeric reported values for clothes dryers, including CEF, capacity, voltage, and hourly Btu rating.
Similarly, DOE proposed adding the same rounding requirement for the capacity measurement in section 3.1 of both appendix D1 and appendix D2, which would add specificity to the measurement of drum capacity as it relates to determining whether a compact-size load for a drum capacity less than 4.4 cubic feet or standard-size load must be used for testing. The proposed rounding requirements for CEF, capacity, voltage, and Btu rating would maintain consistency with the level of precision currently provided in DOEs Compliance Certification Management System CCMS.
DOE also proposed to specify further the rounding instructions provided at 10
CFR 430.23d1 renumbered to paragraph d2 as amended in this document pertaining to estimated annual operating cost. Previously, the rounding instructions for an electric clothes dryer were provided in paragraph d1iC. DOE proposed moving the rounding instructions to paragraph d1i to clarify that the rounding provision applies to the product of all three factors multiplied in paragraphs d1iA, B, and C.
Similarly, for gas clothes dryers, DOE

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