Determine system heating capacity

Determine system heating capacity.  System inspection should never be conducted within 48 hours of completion of soaker hose operation, and should not be conducted within one week of completion of soaker hose operation if the DXGS system is installed during the heating season.  Consult with the Quality Heat Pump Contractor to determine appropriate inspection time during heating season.  For heating capacity tests, the return air temperature should be between 65 degrees F. and 70 degrees F. (Major)
3)  3) Measure the compressor run current while in the heat mode.  The expected current readings should fall within the ranges as specified by the manufacturer. (Major)
4) The air flow shall be between 400 and 450 CFM per ton of capacity. (Major)
a) Determine heating capacity by using the following formula: Btuh = TD x 1.1 x CFM TD =  temperature difference between supply air and return air 1.1 = air properties constant CFM =  Cubic feet per minute air calculated, from funnel, temperature rise, or return air method
b) Verify that system capacity is + 10% of the equipment manufacturer's rating at the test conditions.
Section 2E   01/16/2007
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Note:  If the heating capacity is low, this may be due to an unadjusted heating valve.  The Quality Heat Pump Contractor can adjust the heat valve before re-calculating the heating capacity.
5) Determine system cooling capacity. For cooling capacity tests, the return air temperature should be between 75 degrees F. and 80 degrees F. (Major)
6) Measure the compressor run current while in the heat mode.  The expected current readings should fall within the ranges as specified by the manufacturer. (Major)
7) The air flow shall be between 400 and 450 CFM per ton of capacity. (Major)