Tempering Valve
Three-Way Valve
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
p. 27
p. 26
•
There may be residual fluid that exits the fittings -
use towels or other clean up items as necessary.
9. Carefully remove the Three-Way Valve from the last ¾”
heater hose on the right of the valve.
•
There may be residual fluid that exits the fittings -
use towels or other clean up items as necessary.
10. Remove constant tension clamp from the brass of the
Three-Way Valve on the right, and place it on the new Three-
Way Valve in the same position on the brass.
11.
Discard the old valve and fittings.
12. Using a nylon wire brush, clean the threads of the PEX
fitting so that it is free of leftover thread sealant.
13. Carefully insert the single barb back into the heater hose
that the old valve was attached to.
14. Add thread sealant (454 Loctite or better) to the threads of
the PEX fitting.
15.
Using a wrench, thread the PEX fitting into the three-way
valve.
• 3-6 rotations
• DO NOT BRACE ON THE BLUE PLASTIC WHEN
TIGHTENING. This may damage the mechanism or
electrical components.
16. Install the hoses on the tee on the top of the valve.
17. Move the constant tension hose clamps to just behind the
barb of each fitting.
• Left side of the tee on the top of the 3-way valve.
• Right side of the tee on the top of the 3-way valve.
• Right side of the 3-way valve, off the brass onto the
hose.
18. Connect the electrical wire from the valve to the DC harness.
19. Reinstall the side panel and lid using the saved screws and
washers from Step 2.
20.
Refill the unit with the coolant saved from Step 1.
• Add more coolant is needed.
•
Monitor the newly installed parts and fittings for
leaks.
Replacement Procedure:
1. Drain coolant from system.
• Pour into a bucket to be reused later.
2. Remove top and side panels from the Aqua-Hot.
• Save screws and washers to reuse later
3. Locate the Three-Way Valve in the Aqua-Hot.
4. Disconnect the electrical connection from the Three-Way
Valve to the DC harness.
5. On the right side of the Three-Way Valve, move the constant
tension clamp onto the brass of the Three-Way Valve to
ensure it is out of the way.
6. On the top of the Three-Way Valve, move the two (2)
constant tension clamps AWAY from the tee fitting so that
they are as far from the barb as possible.
7. On the left of the Three-Way Valve, unscrew the brass PEX
fitting from the Three-Way Valve using a wrench.
•
There may be residual fluid that exits the fittings -
use towels or other clean up items as necessary.
8. Remove ¾” heater hose from the tee on the top of the
Three-Way Valve.
DO NOT remove the rivets securing the side panel into place.
Attempting to do so risks irreparable damage to the boiler
tank of the Aqua-Hot
Before replacing the 3-way valve, you must purchase the repair
kit. The Repair Kit should include:
• Three-Way Valve
• Black Nylon tee adapter
• Black Nylon barb adapter
• 2-Pin electrical connector
Figure 49
NOTE:
Adjusting the mixing valve beyond 120°F
will result in a lack of hot water and may result in
scalding. Do NOT attempt to adjust the tempering
valve without assistance from Aqua-Hot Technical
Support or a qualified Aqua-Hot technician.
Activate the Aqua-Hot’s diesel
burner to provide as much heat
as possible to the boiler tank.
This test cannot be completed
with only the electric element.
Open the shower head
valve within the coach to
its hottest setting.
Place one hand on the red
PEX tubing, and before
the tempering valve and
outside the Aqua-Hot.
Are both the red PEX and
just before the tempering
valve warm while hot
water is running?
This tempering valve
is functioning as
intended.
Replace the
tempering
valve.
Yes
No
Testing Procedure:
Follow the testing procedure to the right in order to diagnose
the tempering valve. Troubleshoot the tempering valve if the
following conditions have occurred:
• A lack of hot water.
• Hot water supply is uneven.
• Hot water is too hot.
Three-Way Valve
Figure 48
Tempering Valve
Introduction:
The tempering valve of the Aqua-Hot mixes the hot domestic
water from the interior of the Aqua-Hot with cold incoming
domestic water to temper it to a threshold where scalding will
not occur.
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 panel - only remove the service panels.
Doing so risks irreparable damage to the Aqua-Hot.
Figure 50
