Domestic Water Tempering Valve - Aqua-Hot 375-LP Service Manual

Tempering Valve:
The tempering valve for the Aqua-Hot mixes the heated do-
mestic water from the boiler tank with cold domestic water at
a preset ratio to reduce the risk of scalding.
Troubleshoot the tempering valve if the following condition
has occurred:

There is a lack of hot domestic water.

The Domestic hot water is too hot.
Troubleshooting:
1. Inspect the tempering valve to ensure that it has not been
leaking.
2. Test the tempering valve‟s functionality by turning the
knob. If the tempering valve‟s knob does not turn
freely, follow the instructions in this section to replace
the tempering valve.
3. Test the temperature of the hot water using a digital
thermometer at one of the hot water faucets. Water
Temperature should range between 115° F - 123° F. If
the proper range cannot be set follow the instructions in
this section to replace the tempering valve.
Replacement Procedure:
F
AILURE TO DISCONNECT ALL POWER SUPPLIES AND
TO ALLOW THE HEATER TO COOL BEFORE SERVICING
COULD CAUSE SERIOUS DAMAGE OR PERSONAL INJURY
1. Turn the motor home‟s water pump off.
2. Locate and remove the Domestic Water Access Panel
3. Drain the water pressure by opening the faucets and al-
lowing the water to drain.
4. Disconnect the motor home‟s water lines from the tem-
pering valve assembly, on top of the Aqua-Hot.
© 2011 Aqua-Hot
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375P02 - LP Hydronic Heating System Service Manual—Rev. B
S 4: A
ECTION QUA
5. Remove the Tempering Valve Assembly from the Aqua-
Hot.
A. Disconnect the hot and cold water lines, located on
the front of the Aqua-Hot boiler tank.
B. Loosen the retaining nut on the Hot Water Bulkhead
fitting.
C. Remove the Tempering Valve Assembly, by
lowering the assembly and pulling it out the front of
the Aqua-Hot.
6. Remove the brass fittings from the defective Tempering
valve.
7. Clean and wrap the threads on the brass fittings with a
thread seal tape.
8. Install the brass fittings onto the replacement tempering
valve.
9. Re-Install the tempering valve Assembly onto the Aqua-
Hot.
10. Reconnect the hot and cold water lines onto the hot and
cold pipes, located on the front of the Aqua-Hot boiler
tank.
11. Re-Install the retaining nut on the Hot Water Bulkhead
fitting.
12. Reconnect the motor home‟s water lines to the temper-
ing valve assembly, ensuring they are plumbed correct-
ly.
13. Turn the motor home‟s water pump back on and check
for leaks and the presence of hot domestic water.
14. Verify that the replacement tempering valve has been set
to the proper setting by taking a digital thermometer to
a hot water faucet and set the water temperature between
115*F - 123*F.
15. Re-Install the Domestic Water Access Panel
-H C
OT OMPONENTS
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