Tempering Valve - Aqua-Hot 600 Series Service Manual

Tempering Valve

Interlock Switch
6. Remove the hose barb and the ½" coupler from the
defective check valve.
7. Clean the hose barb and coupler, then wrap the hose
barb and ½" coupler pipe threads with Tefl on tape.
8. Install the hose barb and ½" coupler on the replacement
check valve, ensure that they are installed properly with the
hose barb on the arrow side of the check valve.
9. Install the replacement check valve onto the boiler tank.
The arrow on the check valve must point away from the
tank.
10. Slide the hose back onto the replacement pump and set
the constant tension clamp back into place.
11. Refi ll the Aqua-Hot's boiler tank with the antifreeze and
water heating solution.
Tempering Valve
Introduction:
The tempering valve for the Aqua-Hot mixes the heated
domestic water from the boiler tank with cold domestic water
from the coach's fresh water tank to reduce the risk of scalding.
NOTE: Be sure to review "Lack of Hot Water Troubleshooting
Guide on Page 78 before troubleshooting the mixing valve.
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.
p. 22
Figure 33
Figure 34
©Aqua-Hot® 675D Service Manual
NOTE: Adjusting the mixing valve beyond 120°F (49°C)
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 qualifi ed
Aqua-Hot technician.
1. Inspect the tempering valve to ensure that is not leaking.
2. 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.
3. Test the tempering valve's functionality by turning the knob.
If the tempering valve knob does not turn freely, follow the
instructions in this section to replace the tempering valve.
Tempering Valve
Replacement Procedure
1. Turn the motor home's water pump off.
2. Drain the water pressure by opening the faucets and
allowing the water drain.
3. Disconnect the motor home's water lines from the
tempering valve assembly.
4. Disconnect the PEX pipe and fi ttings from the tempering
valve assembly.
5. Remove the pressure relief valve assembly from the
tempering valve assembly as the tempering valve cannot
Figure 35