Service manual

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600-D01 Series Hydronic Heating System Service Manual - Rev. A

SECTION 4: AQUA-HOT COMPONENTS

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.

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 is

adequately cooled.

Drain the antifreeze and water heating solution from the

Aqua-Hot’s boiler tank using the drain valve.

Disconnect the defective circulation pump’s wires by

separating the quick-disconnect terminals.

Using constant tension pliers, loosen and slide back the

constant tension clamps securing the hoses to the circu-

lation pump.

Remove the hoses from the defective circulation pump.

Release the pump from the mounting bracket by pulling

on each Nylatch plunger, then remove the defective

pump from the Aqua-Hot.

Slide the hoses back onto the replacement pump and set

the constant tension clamps back into place.

Install the replacement pump onto the mounting bracket

by aligning the Nylatch plungers to their respective

holes and pushing the plungers in to secure the pump to

the bracket.

Reconnect the wires on the replacement pump to the

wire harness on the heater by uniting the red quick-

disconnect terminals.

10.

Refill the Aqua-Hot’s boiler tank with the antifreeze and

water heating solution.

11.

Test the Aqua-Hot for normal operation.

Zone 1

Circulation Pump

Zone 2

Circulation Pump

Zone 3

Circulation Pump

Nylatch

Plunger

Figure 16