Cleaning The Inlet Filter; Removing Air From The System; Air Removing Process; Water Drain Plugs - Sanden GAU-A45HPA Service Book

Cleaning the Inlet Filter

1. Remove end cover from the Heating Unit to expose inlet/outlet connections
2. Turn off inlet water (tap to inlet or at main supply)
3. Remove filter plug by unscrewing knurled knob anti-clockwise
4. Clean filter by washing (do not pry anything loose)
5. Replace filter plug (insert & screw clockwise)
6. Turn inlet water on & check to ensure no leak around filter
7. Replace the inside cover and the end cover

Removing air from the system

Air Removing Process

Caution
Hot water may come out. Be careful not to get the hands burnt.

Water drain plugs

Open the water drain plugs (2 places) on the
Heat Pump Unit.
Close the plugs after no air is confirmed in the
water.
Supply the power to the Heat Pump Unit and
leave the water tap open for 3 minutes.
Close the tap after no air is confirmed in the
water.
Sanden Heat Pump –– Service Technical Book
Page 37 of 48