Bypass Mixing Valve ("Non-A" Series) - Navien NP-180 Service Manual

8.2.18. Bypass Mixing Valve
("Non-A" Series)
1. Turn off the gas supply.
2. Turn off the 120V power supply.
3. Turn off the water supply. Drain all wa-ter
from the appliance.
4. Disconnect the mixing valve wire housing
from the PCB.
6. Remove the 2 stainless clips. (fastener "D")
< Figure 49 >
7. Remove the mixing valve outlet pipe.
< Figure 50 >
©Navien America Inc. 2010
8. Remove the Mixing valve from the primary
H/E inlet adapter.
9. Pull out the mixing valve.
10. Replace with new mixing valve.
11. Replace the mixing valve into the primary
H/E inlet adapter.
12. Replace the mixing valve outlet pipe into
the mixing valve.
13. Replace the 2 stainless clips.
14. Replace the PCB.
16. Install front panel using 4(four) screws.
17. Turn on water supply, power supply, and
gas supply.
18. Open a hot water tap and ensure there are
no leaks at the water heater.
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NR/NP series service Manual
< Figure 51 >
Version 2.0