3.0INDOOR PIPING AND CIRCULATION SYSTEM

3.1Circulator Sizing and System and Components

3.1.1The 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.

3.1.2Proper sizing of the circulating pump will be within the Heat Pump Manufacturer's recommended flow rate for the specified unit.

3.1.3Particulate contaminants shall be removed if they exist or could become a problem for the circulation pump.

3.1.4Pressurization 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.

3.1.5The 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.

3.1.6Service valve handles should be removed and the port plugged.

3.1.7Boiler type service valves are not recommended.

3.1.8Garden type hose connections shall not be left on the circulation system.

3.1.9Transition fitting shall be inside or accessible.

3.1.10All indoor piping, including the heat pump water heat exchanger shall be insulated to prevent condensation.

3.2.Antifreeze Selection and Use.

3.2.1Manufacturer's recommended/required antifreeze solutions shall be stated and meet Local and State requirements.

3.2.2Acceptable circulation component material for the antifreeze specified shall be given.

ENERGY STAR Homes Northwest

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Geothermal Heat Pump Design and Installation Standards

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Energy Tech Laboratories Homes Northwest manual Indoor Piping and Circulation System

Homes Northwest specifications

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