Note:

Manufacturers must use the results of testing under this appendix C2 to determine compliance with any standards for dishwashers provided in § 430.32(f)(1) that are published after January 1, 2023. Representations related to energy or water consumption of dishwashers must be made in accordance with the appropriate appendix that applies (i.e., appendix C1 or appendix C2) when determining compliance with the relevant standard. Manufacturers may also use appendix C2 to certify compliance with any amended standards prior to the applicable compliance date for those standards.

0. Incorporation by Reference

In § 430.3, DOE incorporated by reference the entire standard for AHAM DW-1-2020 and AHAM DW-2-2020; however, only enumerated provision of AHAM DW-1-2020, AHAM DW-2-2020, and IEC 62301 are applicable as follows:

0.1 AHAM DW-1-2020

(a) Sections 1.1 through 1.30 as referenced in section 1 of this appendix;

(b) Section 2.1 as referenced in sections 2 and 2.1 of this appendix;

(c) Sections 2.2 through 2.3.3, sections 2.5 and 2.7, sections 2.7.2 through 2.8, and section 2.11, as referenced in section 2 of this appendix;

(d) Section 2.4 as referenced in sections 2 and 2.2 of this appendix;

(e) Section 2.6.3 as referenced in sections 2 and 2.3 of this appendix;

(f) Section 2.7.1 as referenced in sections 2 and 2.4 of this appendix;

(g) Section 2.9 as referenced in sections 2 and 2.5 of this appendix;

(h) Section 2.10 as referenced in sections 2 and 2.6 of this appendix;

(i) Sections 3.1 through 3.2 and sections 3.5 through 3.7 as referenced in section 3 of this appendix;

(j) Section 3.3 as referenced in sections 3 and 3.1 of this appendix;

(k) Section 3.4 as referenced in sections 3 and 3.2 of this appendix;

(l) Section 4.1 as referenced in sections 4 and 4.1 of this appendix;

(m) Section 4.1.4 as referenced in sections 4 and 4.1.2 of this appendix; and

(n) Section 5 as referenced in section 5 of this appendix.

0.2 AHAM DW-2-2020

(a) Section 3.4 as referenced in sections 2 and 2.4 of this appendix, and through reference to sections 1.5 and 1.22 of AHAM DW-1-2020 in section 1 of this appendix.

(b) Section 3.5 through reference to sections 1.5 and 1.22 of AHAM DW-1-2020 in section 1 of this appendix.

(c) Section 4.1 as referenced in section 2 of this appendix.

(d) Sections 5.3 through 5.8 as referenced in section 2 of this appendix, and through reference to sections 1.18, 1.19 and 1.20 of AHAM DW-1-2020 in section 1 of this appendix.

(e) Section 5.10 as referenced in sections 2 and 2.8 of this appendix;

(f) Sections 5.10.1.1 as referenced in sections 4 and 4.2 of this appendix; and

(g) Section 5.12.3.1 as referenced in sections 5 and 5.1 of this appendix.

0.3 IEC 62301

(a) Sections 4.2, 4.3.2, and 5.2 as referenced in section 2 of this appendix; and

(b) Sections 5.1, note 1, and 5.3.2 as referenced in section 4 of this appendix.

1. Definitions

The definitions in sections 1.1 through 1.30 of AHAM DW-1-2020 apply to this test procedure, including the applicable provisions of AHAM DW-2-2020 as referenced in sections 1.5, 1.18, 1.19, 1.20, and 1.22 of AHAM DW-1-2020.

2. Testing Conditions

The testing conditions in Section 2.1 through 2.11 of AHAM DW-1-2020, except sections 2.6.1 and 2.6.2, and the testing conditions in section 5.10 of AHAM DW-2-2020 apply to this test procedure, including the following provisions of:

(a) Sections 5.2, 4.3.2, and 4.2 of IEC 62301 as referenced in sections 2.1, 2.2.4, and 2.5.2 of AHAM DW-1-2020, respectively, and

(b) Sections 5.3 through 5.8 of AHAM DW-2-2020 as referenced in sections 2.6.3.1, 2.6.3.2, and 2.6.3.3 of AHAM DW-1-2020; section 3.4 of AHAM DW-2-2020, excluding the accompanying Note, as referenced in section 2.7.1 of AHAM DW-1-2020; section 5.4 of AHAM DW-2-2020 as referenced in section 2.7.4 of AHAM DW-1-2020; section 5.5 of AHAM DW-2-2020 as referenced in section 2.7.5 of AHAM DW-1-2020, and section 4.1 of AHAM DW-2-2020 as referenced in section 2.10.1 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

2.1 Installation Requirements.

The installation requirements described in section 2.1 of AHAM DW-1-2020 are applicable to all dishwashers, with the following additions:

2.1.1 In-Sink Dishwashers.

For in-sink dishwashers, the requirements pertaining to the rectangular enclosure for under-counter or under-sink dishwashers are not applicable. For such dishwashers, the rectangular enclosure must consist of a front, a back, two sides, and a bottom. The front, back, and sides of the enclosure must be brought into the closest contact with the appliance that the configuration of the dishwasher will allow. The height of the enclosure shall be as specified in the manufacturer's instructions for installation height. If no instructions are provided, the enclosure height shall be 36 inches. The dishwasher must be installed from the top and mounted to the edges of the enclosure.

2.1.2 Dishwashers without a Direct Water Line.

Manually fill the built-in water reservoir to the full capacity reported by the manufacturer, using water at a temperature in accordance with section 2.3 of AHAM DW-1-2020.

2.2 Water pressure.

The water pressure requirements described in section 2.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line.

2.3 Non-soil-sensing and soil-sensing dishwashers to be tested at a nominal inlet temperature of 50 °F, 120 °F, or 140 °F.

The test load and soiling requirements for all non-soil-sensing and soil-sensing dishwashers shall be the same as those requirements specified in section 2.6.3 of AHAM DW-1-2020 for soil-sensing dishwashers. Additionally, both non-soil-sensing and soil-sensing compact dishwashers that have a capacity of less than four place settings shall be tested at the rated capacity of the dishwasher and the test load shall be soiled as follows at each soil load:

(a) Heavy soil load: soil two-thirds of the place settings, excluding flatware and serving pieces (rounded up to the nearest integer) or one place setting, whichever is greater;

(b) Medium soil load: soil one-quarter of the place settings, excluding flatware and serving pieces (rounded up to the nearest integer) or one place setting, whichever is smaller;

(c) Light soil load: soil one-quarter of the place settings, excluding flatware and serving pieces (rounded up to the nearest integer) or one place setting, whichever is smaller, using half the quantity of soils specified for one place setting.

2.4 Test load items.

The test load items described in section 2.7.1 of AHAM DW-1-2020 apply to this test procedure, including the applicable provisions of section 3.4 of AHAM DW-2-2020, as referenced in section 2.7.1 of AHAM DW-1-2020. The following test load items may be used in the alternative.

2.5 Preconditioning requirements.

The preconditioning requirements described in section 2.9 of AHAM DW-1-2020 are applicable to all dishwashers except the measurement of the prewash fill water volume, Vpw, if any, and measurement of the main wash fill water volume, Vmw, are not required.

2.6 Detergent.

The detergent requirements described in section 2.10 of AHAM DW-1-2020 are applicable to all dishwashers. For any dishwasher that does not have a main wash detergent compartment and the manufacturer does not recommend a location to place the main wash detergent, place the detergent directly into the dishwasher chamber.

2.7 Connected functionality.

For dishwashers that can communicate through a network (e.g., Bluetooth® or internet connection), disable all network functions that can be disabled by means provided in the manufacturer's user manual, for the duration of testing. If network functions cannot be disabled by means provided in the manufacturer's user manual, conduct the standby power test with network function in the “as-shipped” condition.

2.8 Evaluation Room Lighting Conditions.

The lighting setup in the evaluation room where the test load is scored shall be according to the requirements specified in section 5.10 of AHAM DW-2-2020.

3. Instrumentation

For this test procedure, the test instruments are to be calibrated annually according to the specifications in section 3.1 through 3.7 of AHAM DW-1-2020, including the applicable provisions of IEC 62301 as referenced in section 3.6 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

3.1 Water meter.

The water meter requirements described in section 3.3 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water meter conditions do not apply and water is added manually pursuant to section 2.1.1 of this appendix.

3.2 Water pressure gauge.

The water pressure gauge requirements described in section 3.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water pressure gauge conditions do not apply and water is added manually pursuant to section 2.1.1 of this appendix.

4. Test Cycle and Measurements

The test cycle and measurement specifications in sections 4.1 through 4.2 of AHAM DW-1-2020 and the scoring specifications in section 5.10.1.1 of AHAM DW-2-2020 apply to this test procedure, including section 5.1, note 1, and section 5.3.2 of IEC 62301 as referenced in section 4.2 of AHAM DW-1-2020. Additionally, the following requirements are also applicable.

4.1 Active mode cycle.

The active mode energy consumption measurement requirements described in section 4.1 of AHAM DW-1-2020 are applicable to all dishwashers. Additionally, the following requirements are also applicable:

(a) After the completion of each test cycle (sensor heavy response, sensor medium response, and sensor light response), the test load shall be scored according to section 4.2 of this appendix and its cleaning index calculated according to section 5.1 of this appendix.

(b) A test cycle is considered valid if its cleaning index is 70 or higher; otherwise, the test cycle is invalid and the data from that test run is discarded.

(c) For soil-sensing dishwashers, if the test cycle at any soil load is invalid, clean the dishwasher filter according to manufacturer's instructions and repeat the test at that soil load on the most energy-intensive cycle (determined as provided in section 4.1.1 of this appendix) that achieves a cleaning index of 70 or higher.

(d) For non-soil-sensing dishwashers, perform testing as described in section 4.1.a through 4.1.c of this appendix, except that, if a test cycle at a given soil load meets the cleaning index threshold criteria of 70 when tested on the normal cycle, no further testing is required for test cycles at lesser soil loads.

4.1.1 Determination of most energy-intensive cycle.

If the most energy-intensive cycle is not known and needs to be determined via testing, ensure the filter is cleaned as specified in the manufacturer's instructions and test each available cycle type, selecting the default cycle options for that cycle type. In the absence of manufacturer recommendations on washing and drying temperature options, the highest energy consumption options must be selected. Following the completion of each test cycle, the machine electrical energy consumption and water consumption shall be measured according to sections 4.1.1 and 4.1.4 of AHAM DW-1-2020, respectively. The total cycle energy consumption, EMEI, of each tested cycle type shall be calculated according to section 5.2 of this appendix. The most energy-intensive cycle is the cycle type with the highest value of EMEI.

For standard dishwashers, test each cycle with a clean load of eight place settings plus six serving pieces, as specified in section 2.7 of AHAM DW-1-2020. For compact dishwashers, test each cycle with a clean load of four place settings plus six serving pieces, as specified in section 2.7 of AHAM DW-1-2020. If the capacity of the dishwasher, as stated by the manufacturer, is less than four place settings, then the test load must be the stated capacity.

4.1.2 Water consumption.

The water consumption requirements described in section 4.1.4 of AHAM DW-1-2020 are applicable to all dishwashers except dishwashers that do not have a direct water line. For such dishwashers these water consumption measurement requirements do not apply and water consumption, V, is the value reported by the manufacturer.

4.2 Scoring.

Following the termination of an active mode test, each item in the test load shall be scored on a scale from 0 to 9 according to the instructions in section 5.10.1.1 of AHAM DW-2-2020.

5. Calculation of Derived Results From Test Measurements

The calculations in sections 5.1 through 5.7 of AHAM DW-1-2020 and section 5.12.3.1 of AHAM DW-2-2020 apply to this test procedure. The following additional requirements are also applicable:

(a) For both soil-sensing and non-soil-sensing dishwashers, use the equations specified for soil-sensing dishwashers.

(b) If a non-soil-sensing dishwasher is not tested at a certain soil load as specified in section 4.1.d of this appendix, use the energy and water consumption values of the preceding soil load when calculating the weighted average energy and water consumption values (i.e., if the sensor medium response and sensor light response tests on the normal cycle are not conducted, use the values of the sensor heavy response test for all three soil loads; if only the sensor light response test is not conducted, use the values of the sensor medium response test for the sensor light response test).

(c) For dishwashers that do not have a direct water line, water consumption is equal to the volume of water use in the test cycle, as specified by the manufacturer.

(d) In sections 5.6.1.3, 5.6.1.4, 5.6.2.3, and 5.6.2.4 of AHAM DW-1-2020, use (C/e) in place of K.

5.1 Cleaning Index.

Determine the per-cycle cleaning index for each test cycle using the equation in section 5.12.3.1 of AHAM DW-2-2020.

5.2 Calculation for determination of the most energy-intensive cycle type.

The total cycle energy consumption for the determination of the most energy-intensive cycle specified in section 4.1.1 of this appendix is calculated for each tested cycle type as:

EMEI = M + EF−(ED/2) + W where, M = per-cycle machine electrical energy consumption, expressed in kilowatt hours per cycle, EF = fan-only mode electrical energy consumption, if available on the tested cycle type, expressed in kilowatt hours per cycle, ED = drying energy consumed using the power-dry feature after the termination of the last rinse option of the tested cycle type, if available on the tested cycle type, expressed in kilowatt hours per cycle, and W = water energy consumption and is defined as: V × T × K, for dishwashers using electrically heated water, and V × T × C/e, for dishwashers using gas-heated or oil-heated water.

Additionally,

V = water consumption in gallons per cycle, T = nominal water heater temperature rise and is equal to 90 °F for dishwashers that operate with a nominal 140 °F inlet water temperature, and 70 °F for dishwashers that operate with a nominal 120 °F inlet water temperature, K = specific heat of water in kilowatt-hours per gallon per degree Fahrenheit = 0.0024, C = specific heat of water in Btu's per gallon per degree Fahrenheit = 8.2, and e = nominal gas or oil water heater recovery efficiency = 0.75. [88 FR 3279, Jan. 18, 2023]