Aqua-Hot 400 Series Service Manual page 31

Replacement Procedure:
Failure to disconnect all power supplies and/or to allow the
heater to cool before servicing could cause serious damage
or personal injury.
1. Ensure that the Aqua-Hot has been completely shut
down and that all power sources have been disconnect-
ed. Also, because this replacement procedure will in-
volve the potential for hot coolant, be sure the heater
has adequately cooled.
2. Drain the antifreeze and water heating solution from the
Aqua-Hot's boiler tank using the drain valve.
3. Disconnect the defective pump's wires.
 Disconnect the ground wire by disconnecting the
quick disconnect terminal.
 Disconnect the power wire by using wire cutters and
cutting the butt connector. (a new butt connector
will need to be utilized when installing the replace-
ment pump)
Figure 19
Insert a thin bladed
screwdriver to re-
lease the plastic
rivet.
4. Using constant tension pliers, loosen and slide back the
constant tension clamps securing the hoses to the
circulation pump.
5. Remove the hoses from the defective circulation pump.
6. Release the pump by using a thin bladed screw driver to
pry the plastic rivets up. Remove the 4 plastic rivets
from the defective pump. Then remove the defective
pump from the Aqua-Hot.
7. Slide the hoses back onto the replacement pump and
set the constant tension clamps back into place.
8. Install the replacement pump and secure in place with
the four plastic rivets.
9. Connect the wires to the replacement pump.
 Connect the ground wire by uniting the quick dis-
connect terminals
 Connect the power wire by using a new butt con-
nector and joining the two wires together.
10. Refill the Aqua-Hot's boiler tank with the antifreeze and
water heating solution.
Pump 1
© Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014
Section #: Title
Aqua-Hot Components
Pump 2
p.
31