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Federal Register / Vol. 86, No. 243 / Wednesday, December 22, 2021 / Proposed Rules not proposing this approach due to the significant burden associated with soiling the load and running the cycle for each available cycle type at each potential soil level. If stakeholder comments indicate that such an approach would be more representative to determine the most energy-intensive cycle, DOE would consider it.
DOE also proposes that prior to running the clean load test to determine the most energy-intensive cycle, the dishwasher filter should be cleaned so that soil particles from any previous tests does not affect the determination of the most energy-intensive cycle.
DOE requests feedback on its proposed methodology for determining the most energy-intensive cycle. DOE
also requests feedback on whether it should consider determination of the most energy-intensive cycle for sensor response test cycle using the respective soil load.
DOE requests feedback on its proposal to require cleaning of the dishwasher filter prior to running the clean load test to determine the most energy-intensive test cycle.
H. Standby Mode Test Method
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1. Standby Power Measurement Section 4.2 of appendix C1 provides instructions for measuring standby mode and off mode power. These instructions do not currently specify if the dishwasher door is to be open or closed when testing in standby mode and off mode. In the August 2019 RFI, DOE requested comment on whether testing with the door closed is representative of energy use in standby mode or off mode during a representative average use cycle or period of use i.e., the door is closed when the dishwasher is not in active mode. 84 FR 43071, 43077.
Additionally, DOE requested feedback on whether energy is consumed when the door is open, and if so, whether the energy consumption with the door open is significantly different from the energy consumed with the door closed. Id.
AHAM commented that it was further investigating the inquiry about whether standby testing with the door closed is representative of energy use in standby mode and whether energy consumed with the door open is significantly different than when the door is closed.
AHAM, No. 5 at p. 7 The Joint Commenters recommended that the test procedure specify that the door remain closed during standby and off mode power testing. Joint Commenters, No. 8
at p. 2 Both CEC and the CAIOUs stated that DOE should specify that standby testing be conducted with the door
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closed. CEC, No. 6 at p. 2; CAIOUs, No.
7 at p. 3 CEC further stated that, intuitively, most consumers will keep the dishwasher door closed to prevent disruption of foot traffic patterns in their kitchen. CEC, No. 6 at p. 2 CEC
reiterated that DOE should fully specify the conditions under which measurements are to be made to improve repeatability. CEC, No. 6 at p.
2 DOE reviewed recent models from different manufacturers and observed that some newer models have LED lights inside the dishwasher tub as well as other indicators either on the door or on the electronic control panel that illuminate when the dishwasher door is open. Additional energy use by any such lights and/or indicators could affect the standby power consumption and the resulting EAEU measurement;
for example, a 1-watt increase in the standby power consumption could impact the EAEU by up to 5 percent, i.e., conducting standby mode testing with the dishwasher door open as compared to testing with the door closed could result impact test results for EAEU by up to 5 percent if the lights consumed an additional 1 watt of power.
Section 4.2 of the new AHAM DW1
2020 standard also includes specific instructions for the door orientation during standby mode testing. It specifies that the standby mode test must be conducted after completing the last active mode test as part of the energy test sequence. Thereafter, the dishwasher door must be opened and immediately closed without changing the control panel settings used for the active mode wash cycle and without disconnecting the electrical supply to the dishwasher. Once the door is closed, the standby mode and off mode measurements should begin.
DOE proposes to reference this requirement from AHAM DW12020
regarding opening and closing the door prior to starting the standby mode and off mode tests. DOE has initially concluded that performing standby mode and off mode testing with the door closed is likely to be most representative of average consumer use while also providing a representative measurement, in particular noting CECs comment that most consumers will keep the dishwasher door closed to prevent disruption of foot traffic patterns in their kitchen.
Based on DOEs interactions with test laboratories, dishwashers are already tested with the door closed in standby mode. Therefore, DOE does not expect any increase in costs to manufacturers
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from this proposed update were it made final.
DOE requests input on its proposal to apply the standby mode and off mode test requirements from Section 4.2 of AHAM DW12020 to appendix C1 and proposed new appendix C2.
2. Annual Combined Low-Power Mode Energy Consumption Calculation Section 5.7 of appendix C1 specifies the method to calculate the annual combined low-power mode energy consumption. The combined low-power mode energy consumption includes the power consumption in inactive mode 31
and off mode,32 depending on whether a unit can enter both of these modes or only one of these modes. To calculate the annual low-power mode energy consumption, Section 5.7 of appendix C1 currently assigns 8,465 hours annually to low-power modes for units that do not have a fan-only mode. For units that have a fan-only mode, the annual hours assigned to low-power modes are calculated for each individual unit based on the tested duration in active mode and fan-only mode. Section 5.7 of appendix C1. That is, the combined low-power annual hours for all available modes other than active mode, SLP, is calculated as:
SLP = H N L + LF for dishwashers capable of operating in fan-only mode; otherwise, SLP =
8,465
Where, H = the total number of hours per year =
8,766 hours per year, N = the representative average dishwasher use of 215 cycles per year, L = the average of the duration of the normal cycle and truncated normal cycle, for non-soil-sensing dishwashers with a truncated normal cycle; the duration of the normal cycle, for non-soil-sensing dishwashers without a truncated normal cycle; the average duration of the sensor light response, truncated sensor light response, sensor medium response, truncated sensor medium response, sensor heavy response, and truncated sensor heavy response, for soil-sensing dishwashers with a truncated cycle option; the average duration of the sensor light response, sensor medium response, and sensor heavy response, for 31 Inactive mode means a standby mode that facilitates the activation of active mode by remote switch including remote control, internal sensor, or timer, or that provides continuous status display.
Section 1.10 of appendix C1.
32 Off mode means a mode in which the dishwasher is connected to a mains power source and is not providing any active mode or standby mode function, and where the mode may persist for an indefinite time. An indicator that only shows the user that the product is in the off position is included within the classification of an off mode.
Section 1.15 of appendix C1.

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