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.

 EE-RM/TP-02-002 COMMENT 12.4
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 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 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.

 EE-RM/TP-02-002 COMMENT 12.4