Ground Water Source

Ground Water Source Heat Pump and Earth Coupled Heat Pump Inspection Procedures
Inspector shall verify the ground water source heat pump and earth couple heat pump adhere to installation standards. (See Installation Standards for certain sections that do not apply.) In addition, inspector shall do the following: • Check ground water source heat pump and earth coupled heat pump for installation of pressure/temperature (P/T) test ports installed in the "water-in" and "water-out" piping runs at the unit. The P/T test ports shall be as close as possible to the heat pump. • Check system heating capacity as follows: − Allow heat pump system to operate for at least 15 minutes. − Measure water pressure drop between water-in and water-out test plugs at heat pump. (Use same instrument to measure both to reduce error). − Measure entering water temperature at water-in test plug.
Section 2B   01/16/2007
 9
− Using manufacturer's performance data, determine the water flow rate (gallons per minute) and the heating capacity of the installation using the measured pressure drop and the measured entering water temperature. − 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  − Verify that system capacity is + 10 percent of the equipment manufacturer's rating at the test conditions