Fluid Circulation Pump
Tempering Valve
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
p. 29
p. 28
Replacement Procedure:
1. Shut off the external domestic water connection, and open
a hot water faucet valve within the coach to relieve the
water pressure.
2. Open the domestic water drain valve on the Aqua-Hot and
release water in the system.
•
Attach hose to the ½” PEX barb to release fluid without
spilling throughout the coach
• Ensure that the hose does not rise from the drain valve
otherwise proper drainage will not happen.
3. Disconnect the coach side domestic water connections
4. Remove the top cover and side covers of the Aqua-Hot to
gain access to the interior components.
• Save the screws and washers to be reused later.
5.
Using a ⅜” (10mm) socket, remove the nut which secures
the domestic water valve assembly to the side of the Aqua-
Hot cabinet (shown below).
6.
Disconnect the swivel fittings attached to the brass tees on
the tempering valve.
•
One swivel fitting is attached to the red PEX and the
other is attached to the blue PEX.
•
There may be residual fluid in the lines. Use clean-up
items and tools as needed.
7. Remove the P-clamp from the stud on the wall of the Aqua-
Hot. Save the P-clamp for reuse later.
8. Slide the tempering valve assembly gently backwards
towards the coolant tank until the PEX tubes of the
assembly are no longer protruding from the Aqua-Hot.
• Ensure you do not collide with the controller or damage
any other components in the Aqua-Hot.
9. Remove the assembly from the Aqua-Hot.
10.
Remove all three fittings from the tempering valve as shown
below.
11. Discard the defunct mixing valve.
12.
Using Teflon tape and domestic water safe thread sealant,
reinstall all fittings to previous orientations.
13. Place previous P-clamp onto the assembly before inserting
into the Aqua-Hot.
14. Insert repaired assembly into the Aqua-Hot and slide the
red and blue PEX through their ports in the front face of the
Aqua-Hot.
• Use soapy water as necessary to lubricate the PEX
going through the rubber grommets in the ports.
• DO NOT SPRAY ELECTRICAL COMPONENTS AND WIRES
WITH SOAPY WATER.
15.
Connect the swivel fittings back to their respective places
on the assembly.
•
Do NOT over-tighten the swivel fittings.
16. Using the nut from Step 5, tighten down the P-clamp on the
assembly.
17. Reattach the domestic water lines and check for leaks
before replacing the side and top panels of the Aqua-Hot.
18. After checking for leaks, replace the side and top panels of
the Aqua-Hot using the screws from Step 4.
Figure 51
Figure 52
Figure 53
Fluid Circulation Pump
Introduction:
The fluid circulation pump operates to provide fluid circulation
to either the interior heating zone or the antifreeze boiler tank
depending on the heating and hot water needs at the time.
Troubleshooting Procedure:
If the fluid circulation pump has failed, it will typically indicate
an over-current fault on the controller fault log. If this is the case,
the fault must be verified before replacing the circulation pump.
Follow the procedure to diagnose the fluid circulation pump.
Power cycle the Aqua-Hot
to clear any current faults.
Locate the Aqua-Hot LCD
screen. Navigate to the
TESTING page (Figure 56a).
Activate the internal
circulation pump, and if
necessary the boost pump
Does the suspect pump
activate?
Navigate to the faults page
(Figure 56b).
Using a multi-meter, test
for voltage between pins
J6-7 and J6-8.
No
Yes
Is voltage present between
these pins?
Navigate to the TEST tab
and activate the internal
circulation pump
No
Yes
Replace the
circulation
pump
Replace the
Aqua-Hot
controller
Yes
Are any pump over-current
faults displayed?
Replace the
circulation
pump
This pump is
operating as
intended.
No
Figure 54
NOTE:
The side panel has been made transparent in the
view above to aid in the explanation of the repair. DO NOT
remove the side panels. Doing so risks irreparable damage
to the Aqua-Hot.
Figure 56a
Figure 56b
Figure 55
