Section 3.1.4.1.1 Cooling Full-load Air Volume Rate for Ducted Units. The

manufacturer must specify the Cooling Full-load Air Volume Rate. Use this value as long as the following two requirements are satisfied. First, when conducting the A or A2 Test (exclusively), the measured air volume rate, when divided by the measured indoor air-side total cooling capacity must not exceed 37.5 cubic feet per minute of standard air (scfm) per 1000 Btu/h. If this ratio is exceeded, reduce the air volume rate until this ratio is equaled. Use this reduced air volume rate for all tests that call for using the Cooling Full-load Air Volume Rate. The second requirement is as follows:a. For ducted units that are tested with a fixed-speed, multi-speed, or variablespeed variable-air-volume-rate indoor fan installed. The second requirement applies exclusively to the A or A2 Test and is met as follows.

1. Achieve the Cooling Full-load Air Volume Rate, determined in accordance with the previous paragraph; 2. Measure the external static pressure; 3. If this pressure isequal to or greater than the applicable minimum external static pressure cited in Table 2, the second requirement is satisfied. Use the current air volume rate for all tests that require the Cooling Full-load Air Volume Rate. 4. If the Table 2 minimum is not equaled or exceeded, 4a. reduce the air volume rate until the applicable Table 2 minimum is equaled or 4b. until the measured air volume rate equals 95 percent of the air volume rate from step #1, whichever occurs first.

5. If the conditions of step #4a occur first, the second requirement is satisfied. Use the step #4a reduced air volume rate for all tests that require the Cooling Full-load Air Volume Rate. 6. If the conditions of step #4b occur first, make an incremental change to the set-up of the indoor fan (e.g., next highest fan motor pin setting, next highest fan motor speed) and repeat the evaluation process beginning at above step #1. If the indoor fan set-up cannot be further changed, reduce the air volume rate until the applicable Table 2 minimum is equaled. Use the reduced air volume rate for all tests that require the Cooling Full-load Air Volume Rate.Section 3.1.4.4.3 Ducted heating-only heat pumps. The manufacturer must specify the

Heating Full-load Air Volume Rate. Use this value when the following two requirements are satisfied. First, when conducting the Hl and H12 Test (exclusively), the measured air volume rate, when divided by the measured indoor air-side total heating capacity, must

not exceed37.5 cubic feet per minute of standard air (scfm) per 1000 Btu/h. If this ratio is exceeded, reduce the air volume rate until this ratio is equaled. Use this reduced air volume rate for all tests of heating-only heat pumps that call for the Heating Full-load Air Volume Rate. The second requirement is as follows: a. For heating-only heat pumps that are tested with a fixed-speed, multi-speed, or variable-speed variable-air-volume-rate indoor fan installed. The second requirement applies exclusively to the Hl or Hi2 Test and is met as follows. 1. Achieve the Heating Full-load Air Volume Rate, determined in accordance with the previous paragraph; 2. Measure the external static pressure; 3. If this pressure is equal to or greater than the Table 2 minimum external static pressure that applies given the heating-only heat pump's rated heating capacity, the second requirement is satisfied. Use the cunent air volume rate for all tests that require the Heating Full-load Air Volume Rate. 4. If the Table 2 minimum is not equaled or exceeded, 4a. reduce the air volume rate until the applicable Table 2 minimum is equaled or 4b. until the measured air volume rate equals 95 percent of the air volume rate from step #1, whichever occurs first.

5. If the conditions of step #4a occurs first, the second requirement is satisfied. Use the step #4a reduced air volume rate for all tests that require the Heating

Full-load Air Volume Rate. 6. If the conditions of step #4b occur first, make an incremental change to the set-up of the indoor fan (e.g., next highest fan motor pin setting, next highest fan motor speed) and repeat the evaluation process beginning at above step #1. If the indoor fan set-up cannot be further changed , reduce the air volume rate until the applicable Table 2 minimum is equaled. Use the reduced air volume rate for all tests that require the Heating Full-load Air

Volume Rate.