Fluid Circulation Pump
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 33
Replacement Procedure:
1. En
sure that the Aqua-Hot has been completely shut down,
all power sources have been disconnected, and that the
unit has been allowed to cool completely.
2. Clamp the zone outlet, and the zone return with hose pinch-
pliers as shown below.
3. Drain the antifreeze and water heating solution from the
Aqua-Hot’s boiler tank using the drain valve.
4. Disconnect the defective pump’s wires by removing the
electrical plug from the pump body.
5. Using constant tension pliers, loosen and slide back
the constant tension clamps securing the hoses to the
circulation pump.
6. Remove the hoses from the defective circulation pump.
7. Set the defective pump aside, and put the replacement
pump in the same position.
8. Slide the hoses back onto the replacement pump and set
the constant tension clamps back into place.
9. Connect the wires to the replacement pump.
10.
Refill the boiler tank with a 50/50 mixture of propylene
glycol and distilled water.
11.
Once the tank has been filled, purge the heating zones by
activating the circulation pump on the LCD screen for at
least 20 minutes.
Figure 54
Figure 55
Failure to disconnect all power supplies and/or allow
the unit to cool before servicing could cause serious
damage or personal injury.
CLAMP
