Sanden GAUS-315EQTD Installation Manual page 16

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 7: Air removal process
PR valve
lever
PR Valve Lever
Plumb pipes to Storage Tank Unit and Heat Pump Unit.
Push up the lever on the PR valve to open,
and fill in the tank with water.
Confirm the water come out of the relief valve,
and then close the lever.
Water drain plugs
Open the faucet to remove air. Close the faucet after no air
bubbles can be seen in the water.
Open the water drain plugs (2 places) on the Heat Pump
Unit.
Close the plugs after no air is confirmed in the water supply.
Then connect power to the Heat Pump Unit. Open Faucets.
Sanden Heat Pump – Installation Manual
Page 16 of 33