Sanden Heat Pump – Owner’s Manual
Page 11 of 20
Removing air from the system
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The following steps must be taken to ensure all air is removed from the system.
Incorrect removal of air may cause the water temperature to vary.
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Plumb pipes to the tank unit and the heat pump unit.
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Push up the lever on the PTR valve to open, and fill the tank unit with water.
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Confirm that the water comes out of the relief valve and then close the lever.
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Open the hot water taps in the home to remove air.
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Close the hot water taps in the home after no air is confirmed in the water.
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Open the water drain plugs (two places) on the heat pump unit.
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Close the plugs after no air is confirmed in the water.
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Connect the power to the heat pump unit and leave a hot water tap open in the
home for three minutes.
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Close the house hot water tap after no air is confirmed in the water.
Figure 4: Air removing process
Plumb pipes to Storage Tank Unit and Heat Pump Unit.
Push up the lever on the PTR 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.
PTR valve lever
