Service manual

— Page 32 —
© January 2013 Aqua-Hot
®
600-D01 Series Hydronic Heating System Service Manual - Rev. A
SECTION 4: AQUA-HOT COMPONENTS
Pumps
Circulation Pumps #1, #2 and #3:
The circulation pumps first draw the heated antifreeze and
water heating solution from the Aqua-Hot’s boiler tank, then
propel it through the Hydronic heating system’s interior heat
plumbing.
Troubleshoot the circulation pumps if the following condi-
tion has occurred:

The circulation pump is not operating and the “Low
Temp Cutoff Status” indicator light is illuminated on the
electronic controller.

The Zone Pump indicator light illuminates red on the
electronic controller.
Troubleshooting:
1.
Verify that the “Low Temp Cutoff Status” indicator
light on the electronic controller is illuminated, as it will
be continuously with the 600 Series Aqua-Hot.
2.
Turn on the interior room thermostat corresponding to
the circulation pump not operating (heating zone 1 oper-
ates with circulation pump #1, heating zones 2,3,and 4
operate with circulation pump #2 and heating zone 5
operates with circulation pump #3). Check the corre-
sponding “Heating Zone Status” indicator lights on the
electronic controller for illumination.
If the “Heating Zone Status” indicator light does not
illuminate, complete the following:
A.
Install a jumper wire on the JP1 plug between the
pins corresponding to the room thermostat operating
the circulation pump that is not operating. Refer-
ence the wiring diagram in Appendix A. This will
bypass the room thermostat.
When the “Heating Zone Status” indicator light
illuminates on the electronic controller, the corre-
sponding “Pump #1” and/or “Pump #2” and/or
“Pump #3” indicator light should illuminate as well.
B.
With the jumper wire installed, check the indicator
light corresponding to the pump not operating.
If the indicator light illuminates green, complete the
following:
A.
Using a voltmeter, check for 12 volts of DC power
on the JP3 plug pins corresponding to the pump not
operating.
If 12 volts of DC power are not present, follow the
instructions in this manual to replace the electronic
controller.
B.
Disconnect the circulation pump’s wires from the
wiring harness, then, using a voltmeter, check the
wires on the wiring harness for 12 volts of DC
power.
If 12 volts of DC power are present at the wiring
harness, follow the instructions in this section to
replace the circulation pump.
If the indicator light illuminates red, complete the
following:
A.
Disconnect the circulation pump’s wires.
If the indicator light turns green with the circulation
pump disconnected, follow the instructions in this
section to replace the circulation pump.
If the indicator light remains red with the circulation
pump disconnected, check the wiring for damage.
If no damage is found, follow the instructions in this
manual to replace the electronic controller.
NOTE: The circulation pump can be tested by connecting
it to an external 12 Volt-DC source to verify that the pump
is defective.