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Federal Register / Vol. 86, No. 167 / Wednesday, September 1, 2021 / Proposed Rules
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As noted, DOE defined the proposed new load sizes and LUFs such that the weighted-average load size equals the weighted-average load size of the current minimum, average, and maximum load definitions for clothes washers with automatic WFCS, and thus will produce test results with equivalent representativeness. As noted in DOEs responses to comments above, DOE is not aware of any more recent, nationally representative field data indicating that the consumer load size distribution in relation to clothes washer capacity has changed since the introduction of the three load sizes in the August 1997
Final Rule.
Further, defining the small and large loads to represent approximately the 25th and 75th percentiles of the normal distribution balances the need to capture as large of a load size range as possible while remaining representative
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of the peak of the load distribution curve, which represents the most frequently used load sizes.
Specifically, DOE is proposing that the small and large load sizes be calculated using Equation III.1 and Equation III.2, respectively.
Small load size lb = 0.90 Capacity ft3 + 2.34
Equation III.1 Proposed Determination of the Small Test Load Size Large load size lb = 3.12 Capacity ft3 + 0.72
Equation III.2 Proposed Determination of the Large Test Load Size As noted, clothes washers with manual WFCS are tested only with the minimum and maximum load sizes, in contrast to clothes washers with automatic WFCS, which are tested with all three load sizes. Given DOEs proposal to define only two load sizes in the proposed new Appendix J, the same two load sizes could be used for
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all clothes washers, regardless of whether a clothes washers WFCS is automatic or manual.
DOEs proposal would reduce test burden under the proposed new Appendix J by requiring only two load sizes to be tested instead of three for clothes washers with automatic WFCS.
Specifically, the number of cycles tested would be reduced by 33 percent for clothes washers with automatic WFCS, which represent a large majority of clothes washers on the market.
DOEs proposed water fill selections corresponding to the new small and large load sizes are further discussed in section III.D.2 of this document.
DOE requests comment on its proposal to replace the minimum, maximum, and average load sizes with the small and large load sizes in the proposed new Appendix J. DOE seeks comment on how reducing the number of load sizes tested would impact the
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Figure 111.3 Illustrative Depiction of the Two Load Sizes Representing the Normal Distribution of Consumer Loads from the 1995 Procter & Gamble Data