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Federal Register / Vol. 86, No. 243 / Wednesday, December 22, 2021 / Proposed Rules
72753

TABLE III2DETERGENT DOSAGE IN GRAMS FOR EACH INVESTIGATIVE TEST
Appendix C1
Test unit
1 2
3 4

Prewash detergent g

New detergent with current dosage
Main wash detergent g
0 0
0 11

10.5
12.5
105
11

Prewash detergent g
Main wash detergent g
0 0
0 11

10.5
13
11
11

New detergent with new dosage Prewash detergent g
Main wash detergent g
7.2
0 0
7.2

7.2
7.2
7.2
7.2

TABLE III3MEASURED WATER CONSUMPTION AND ESTIMATED ANNUAL ENERGY USE FOR EACH INVESTIGATIVE TEST
Appendix C1
Test unit
khammond on DSKJM1Z7X2PROD with PROPOSALS2

1
2 3
4

Water gal/cycle

Table III3 indicates that for test units 1, 2, and 3, the water consumption among the three tests varied within a range of 0.10.2 gal/cycle. For unit 4, the Appendix C1 test and the New Detergent with New Dosage test yielded equivalent water consumption values; however, the water consumption of the New Detergent with Current Dosage test was 2.5 gal/cycle higher, an increase of 73 percent over the other two tests. Similar percentage differences were observed for EAEU among the three tests. Given the small sample size of only 4 test units, DOE believes that additional testing would be required to determine whether the observed variation in results is due to the change in detergent and dosage, or whether it could be attributed to unrelated differences in the sensor response of these soil-sensing dishwashers, or other factors.
Given the uncertainty about whether the new detergent and dosing requirements would impact the energy and water consumption of dishwashers, DOE proposes that both the current detergent and dosage requirement as well as the new detergent and new dosage requirement would be allowable to use for testing according to appendix C1. By maintaining the use of the current detergent and dosing requirements, manufacturers would not be required to re-test currently certified dishwashers. Because DOE is proposing the detergent type and dosage specifications in AHAM DW12020 in addition to the current requirements, this proposal would not require the rerating or re-certification of dishwashers
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EAEU
kWh/year
2.3
3.1
3.2
3.4

211
257
269
273

New detergent with current dosage
New detergent with new dosage
Water gal/cycle
Water gal/cycle
2.4
3.3
3.2
5.9

currently on the market. Additionally, permitting the optional use of the detergent and dosing specifications in AHAM DW12020 would avoid the need for manufacturers to request test procedure waivers should the currently required detergent become unavailable and would harmonize with current industry practice.
For the new appendix C2, which would be required at the time compliance is required with updated energy and water conservation standards, DOE proposes to specify only the new detergent and dosage requirements from AHAM DW12020.
The current dosage requirements specify detergent dosage based on water volume, which requires distinguishing the water used in the pre-wash from the water used in the main wash. DOE has observed, and stakeholders have also expressed, that uncertainty in differentiating the pre-wash and main wash cycles to estimate detergent dosage could be a potential source of test variation. As stated, the new detergent dosage is based on the number of place settings rather than measurement of pre-wash and main wash water volumes, potentially providing more consistent dosing. More consistent dosing would improve the repeatability and reproducibility of the results. Additionally, the new dosage would reduce test burden since it would eliminate the need to identify, isolate, and calculate the pre-wash and main wash water volumes.
DOE requests comment on its proposal to adopt in appendix C1 the new detergent and new dosage
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EAEU
kWh/year 204
256
265
357

2.5
3.3
3.1
3.9

EAEU
kWh/year 204
261
274
301

requirements as specified in AHAM
DW12020, while also retaining the current detergent and dosage requirements in appendix C1. The use of either set of detergent requirements would be allowable for testing under appendix C1. DOE also requests comment on the detergent currently being used by manufacturers and test laboratories for testing and certification of dishwashers.
If stakeholder comments indicate that the currently specified detergent, Cascade with the Grease Fighting Power of Dawn, is no longer being used by manufacturers, DOE may instead consider including only the new detergent, Cascade Complete Powder, and dosage requirements from AHAM
DW12020 in appendix C1, rather than allowing both the current and new detergent and dosage requirements.
DOE also welcomes comments and data on the impact of the new detergent and dosage on energy and water use.
6. Rinse Aid Section 2.1 of appendix C1 currently requires that testing be conducted without the use of rinse aid, and that any rinse aid reservoirs remain empty for testing.
In the August 2019 RFI, DOE noted that a standard from IEC, IEC 60436:
Electric Dishwashers for Household UseMethods for Measuring the Performance IEC 60436 specifies the use of rinse aid during testing. 84 FR
43071, 43077. IEC 60436 requires the use of a standard rinse aid formulation rather than a commercially marketed brand. DOE sought information from stakeholders on consumer use of rinse
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