Aqua-Hot AHE-100-02S, Руководство по обслуживанию

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— Page 27 —
© 2011 Aqua-Hot
®
AHE-100-02S Hydronic Heating System Service Manual—Rev. B
S
ECTION
5: A
QUA
-H
OT
C
OMPONENTS
S
ECTION
5: A
QUA
-H
OT
C
OMPONENTS
Pumps
Engine Preheat Pump:
The Engine Preheat circulation pump draws the cold anti-
freeze and water heating solution from the motor home’s
engine and then propels it through the Engine Preheat Heat
exchanger, located inside the boiler tank.
Troubleshoot the Engine Preheat Pump if the following con-
dition has occurred:

The Engine Preheat Pump is not operating, and the
Engine Preheat Switch inside the motor Home is in the
ON position .
Troubleshooting:
A. Using a Volt Meter , Check for voltage on the Fuse
Block for the Engine Preheat, Fuse A.
a. If No voltage, replace the fuse.
b. If Yes continue.
B. Using a Volt Meter , Check for a Ground signal on
the Terminal Strip for the Engine Preheat Pump.
a. If No ground is present use a jumper wire and
jumper the engine preheat connection on the
terminal strip to a ground. If the Engine Preheat
pump comes on and runs check for loose wires.
If no loose wires are present replace the engine
preheat switch inside the motor home
If Yes continue.
C. Check the Engine Preheat pump for voltage.
a. If there is voltage and the engine preheat
pump is not operating, follow the engine pre
heat pump replacement procedure in this book.
Replacement Procedure:
F
AILURE 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 both the heat-
er and motor home engine are adequately cooled.
3. Using hose pinch off pliers, clamp both hoses attached
to the engine preheat loop, closed.
4. Remove the Hose and hose barb fitting attached to the
engine preheat pump bulk head fitting.
5. Using a 1 1/4” and a 1 3/8” wrench loosen and remove
the bulk head fitting.
6.
Using a 3/4” and a 1 1/8” wrench disconnect the union
securing the engine preheat pump in place.
7.
Disconnect the defective circulation pump’s wires by
removing the protective loom, and cutting both the posi-
tive and negative wires with wire cutters.
7.
Remove the zone circulation pump.
8.
Using a 1” wrench remove both of the copper pump
stands from the defective pump. Be sure to mark the
location of each stand to ensure proper installation of the
replacement pump.
9. Wrap the threads of the new replacement pump with a
thread seal tape.
10. Install the pump stands onto the replacement pump, and
tighten down with a 1” wrench.
11. Reinstall the engine preheat pump. Be sure the arrow on
the pump is pointing towards the aqua hot boiler tank.
NOTE: Either the diesel-burner switch or the electric ele-
ment switch must also be activated in order for the engine
preheat feature to function.
NOTE:
The engine preheat pump can be tested by con-
necting it to an external 12 Volt-DC power source to verify
that the pump is defective.
NOTE: Before Replacing the Pump Remove and inspect
the brushes on the pump. If they are less than 1/8” the
brushes are to worn and will prevent the pump from
operating.