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ENERGY STAR Homes Northwest
Geothermal Heat Pump Design and Installation Standards
5
3.0 INDOOR PIPING AND CIRCULATION SYSTEM
3.1 Circulator Sizing and System and Components
3.1.1 The circulator wattage should not exceed 100 watts/ton. For circulation
systems with water control value does not apply. The use of water control
valves on closed loops is not recommended unless required by the
manufacturer.
3.1.2 Proper sizing of the circulating pump will be within the Heat Pump
Manufacturer's recommended flow rate for the specified unit.
3.1.3 Particulate contaminants shall be removed if they exist or could become a
problem for the circulation pump.
3.1.4 Pressurization of the circuit shall be to a minimum of 10 to 15 psi when
installed in the summer and 25 to 30 psi when installed in the winter.
3.1.5 The circulation system shall incorporate flow and temperature sensing for
testing the performance of the water side of the heat pump system. Pressure
and temperature sensing ports at the inlet and outlet of the heat pump water
heat exchanger are required, even if permanent sensors are also installed. The
sensing ports should be within two (2) feet of the heat pump, and should be
at the unit connections whenever possible.
3.1.6 Service valve handles should be removed and the port plugged.
3.1.7 Boiler type service valves are not recommended.
3.1.8 Garden type hose connections shall not be left on the circulation system.
3.1.9 Transition fitting shall be inside or accessible.
3.1.10 All indoor piping, including the heat pump water heat exchanger shall be
insulated to prevent condensation.
3.2. Antifreeze Selection and Use.
3.2.1 Manufacturer's recommended/required antifreeze solutions shall be stated
and meet Local and State requirements.
3.2.2 Acceptable circulation component material for the antifreeze specified shall
be given.