Sanden
Heat
Pump
–
Owner’s
Manual
Page
10
of
20
Filling the System & Purging Air
The following steps must be taken to ensure all air is removed from the system.
Incorrect purging of air may cause the water temperature to vary during operation.
Ensure that all piping to tank unit and heat pump unit are installed and connections
are tight, then open the Cold Water Supply Valve to the system.
Push up the lever on the PR valve to open, and fill the tank unit with water.
Confirm that water comes out of the relief valve, and then close the lever.
Open the hot water faucets to remove air from the house piping system.
Close the faucets after no air is seen in the water.
Open the water drain plugs (two places) on the heat pump unit.
Close the plugs after no air is seen in the water.
Supply power to the heat pump unit and leave the hot water faucets open for 3
minutes. Close the faucet after no air can be seen in the water.
Figure 4: Air removal process
