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Federal Register / Vol. 86, No. 193 / Friday, October 8, 2021 / Rules and Regulations
1.
1.3 AHAM HLD1 means the test standard published by the Association of Home Appliance Manufacturers, titled Household Tumble Type Clothes Dryers, ANSI-approved June 11, 2010, ANSI/AHAM
HLD12010.

1.11 Final moisture content FMC
means the ratio of the weight of water contained by the dry test load i.e., after completion of the drying cycle to the bonedry weight of the test load, expressed as a percent.

1.13 Initial moisture content IMC
means the ratio of the weight of water contained by the damp test load i.e., prior to completion of the drying cycle to the bone-dry weight of the test load, expressed as a percent.

1.20 Vented clothes dryer means a clothes dryer that exhausts the evaporated moisture from the cabinet.

2.
2.1.1 For both vented clothes dryers and ventless clothes dryers, install the clothes dryer in accordance with manufacturers instructions as shipped with the unit.
2.1.2 Vented clothes dryers. For vented clothes dryers, the dryer exhaust shall be restricted by adding the AHAM exhaust simulator described in section 3.3.5.1 of AHAM HLD1.
2.1.3 For ventless clothes dryers, the dryer shall be tested without the AHAM
exhaust simulator.

2.2.1 For drying testing, maintain the room ambient air temperature at 75 3 F and the room relative humidity at 50 percent 10
percent relative humidity.

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2.4.1 Weighing scales.
2.4.1.1 Weighing scale for test cloth. The scale shall have a range of 0 to a maximum of 60 pounds with a resolution of at least 0.001 pounds and a maximum error no greater than 0.1 percent of any measured value within the range of 3 to 15 pounds.

2.7.1 Load size. Determine the load size for the unit under test, according to Table 1
of this section.

TABLE 1TEST LOADS

2.3.2.1 Natural gas supply. Maintain the gas supply to the clothes dryer immediately ahead of all controls at a pressure of 7 to 10
inches of water column. The natural gas supplied should have a heating value of approximately 1,025 Btus per standard cubic foot. The actual heating value, Hn2, in Btus per standard cubic foot, for the natural gas to be used in the test shall be obtained either from measurements using a standard continuous flow calorimeter as described in section 2.4.6 of this appendix or by the purchase of bottled natural gas whose Btu rating is certified to be at least as accurate a rating as could be obtained from measurements with a standard continuous flow calorimeter as described in section 2.4.6
of this appendix.
2.3.2.2 Propane gas supply. Maintain the gas supply to the clothes dryer immediately ahead of all controls at a pressure of 11 to 13 inches of water column. The propane gas supplied should have a heating value of approximately 2,500 Btus per standard cubic foot. The actual heating value, Hp, in Btus per standard cubic foot, for the propane gas to be used in the test shall be obtained either from
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measurements using a standard continuous flow calorimeter as described in section 2.4.6
of this appendix or by the purchase of bottled gas whose Btu rating is certified to be at least as accurate a rating as could be obtained from measurement with a standard continuous calorimeter as described in section 2.4.6 of this appendix.
2.3.2.3 Hourly Btu Rating. Maintain the hourly Btu rating of the burner within 5
percent of the rating specified by the manufacturer. If the hourly Btu rating of the burner cannot be maintained within 5
percent of the rating specified by the manufacturer, make adjustments in the following order until an hourly Btu rating of the burner within 5 percent of the rating specified by the manufacturer is achieved:
1 Modify the gas inlet supply pressure within the allowable range specified in section 2.3.2.1 or 2.3.2.2 of this appendix, as applicable;
2 If the clothes dryer is equipped with a gas pressure regulator, modify the outlet pressure of the gas pressure regulator within 10 percent of the value recommended by the manufacturer in the installation manual, on the nameplate sticker, or wherever the manufacturer makes such a recommendation for the basic model; and 3 Modify the orifice as necessary to achieve the required hourly Btu rating.

Test load bone dry weight
Unit under test Standard size clothes dryer.
Compact size clothes dryer.

8.45 pounds .085
pounds.
3.00 pounds .03
pounds.

Each test load must consist of energy test cloths and no more than five energy stuffer cloths.
2.7.2 Test load preparation. Dampen the load by agitating it in water whose temperature is 60 F 5 F and consists of 0
to 17 parts per million hardness for approximately 2 minutes to saturate the fabric. Then, extract water from the wet test load by spinning the load until the moisture content of the load is between 52.5 and 57.5
percent of the bone-dry weight of the test load. Make a final mass adjustment, such that the moisture content is 57.5 percent 0.33
percent by adding water uniformly distributed among all of the test cloths in a very fine spray using a spray bottle.

2.8.1 Vented clothes dryers. For vented clothes dryers, before any test cycle, operate
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the dryer without a test load in the non-heat mode for 15 minutes or until the discharge air temperature is varying less than 1 F for 10 minuteswhichever is longerin the test installation location with the ambient conditions within the specified test condition tolerances of section 2.2 of this appendix.

3.
3.3.1 Timer dryers. For timer dryers, operate the clothes dryer at the maximum temperature setting and, if equipped with a timer, at the maximum time setting. Any other optional cycle settings that do not affect the temperature or time settings shall be tested in the as-shipped position, except that if the clothes dryer has network capabilities, the network settings must be disabled throughout testing if such settings can be disabled by the end-user and the products user manual provides instructions on how to do so. If the network settings cannot be disabled by the end-user, or the products user manual does not provide instruction for disabling network settings, then the unit must be tested with the network settings in the factory default configuration for the test cycle. If the clothes dryer does not have a separate temperature setting selection on the control panel, the maximum time setting should be used for the drying test cycle. Dry the load until the moisture content of the test load is between 1 and 2.5 percent of the bone-dry weight of the test load, at which point the test cycle is stopped, but do not permit the dryer to advance into cool down.
If required, reset the timer to increase the length of the drying cycle. After stopping the test cycle, remove and weigh the test load within 5 minutes following termination of the test cycle. The clothes dryer shall not be stopped intermittently in the middle of the test cycle for any reason. Record the data specified by section 3.4 of this appendix. If the dryer automatically stops during a cycle because the condensation box is full of water, the test is stopped, and the test run is invalid, in which case the condensation box shall be emptied and the test re-run from the beginning. For ventless clothes dryers, during the time between two cycles, the door of the dryer shall be closed except for loading and unloading.
3.3.2 Automatic termination control dryers. For automatic termination control dryers, a normal program shall be selected for the test cycle. For dryers that do not have a normal program, the cycle recommended by the manufacturer for drying cotton or linen clothes shall be selected. Where the drying temperature setting can be chosen independently of the program, it shall be set to the maximum. Where the dryness level setting can be chosen independently of the program, it shall be set to the normal or medium dryness level setting. If such designation is not provided, then the dryness level shall be set at the mid-point between the minimum and maximum settings. If an even number of discrete settings are provided, use the next-highest setting above the midpoint, in the direction of the maximum dryness setting or next-lowest setting below the midpoint, in the direction of the minimum dryness setting. Any other
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