Heat Pump Installation Instructions


A heat pump extracts thermal energy from the air, water or ground and transfers it to your home in the form of heat or cool air. Whether you reside in a tropical or temperate region, a heat pump is an essential device to have in your home. With basic guidelines and a little patience, you can have your heat pump up and running in a short time.

Things You'll Need

  • Heat pump
  • Torch
  • 1/4-inch nut driver

Connecting Refrigerant Lines

  • Take the suction and liquid lines from the indoor coil fittings and run them to the heat pump fittings. When running lines, you should avoid any unnecessary turns or bends.

  • Insulate the entire suction line. Do not let the suction and liquid lines come into direct contact with floors, walls, duct work, floor joists or other piping.

  • Take out the cores of the valves and use a wet rag to wrap the valves.

  • Use a brazing compound, such as an alloy of silver or copper, to attach the liquid and suction lines together. The temperature for brazing should be a melting point above 1,100 degrees Fahrenheit.

  • Ensure that the indoor coil is attached to the refrigerant lines and reconnect the valve cores.

  • Use a moderate pressure of dry nitrogen, such as 20 pounds per square inch, to pressurize the lines and indoor coil. Check the refrigerant lines and indoor coil for any leaks.

  • Empty the indoor coil and lines to at least 500 microns. This will allow getting rid of contamination and moisture. Detach the vacuum pump.

  • Unfasten the suction and liquid valves completely.

  • Apply insulation to the suction line using the refrigerant line insulation material for about 1/4 inch or more of wall thickness. Place insulating material around the refrigerant lines that penetrate the structure. This helps to protect the lines and decrease vibration.

Electrical Connections

  • Disconnect the power lines in the control box.

  • Attach field supply wires L1 and L2 to contractor terminals L1 and L2.

  • Fasten the ground wire to the green pigtail lead and attach the low-voltage circuit.

  • Cover the control box and connect the power.

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