3-Way Valve ("A" Series) - Navien NP-180 Service Manual

8.2.16. 3-way Valve ("A" Series)

1. Turn off the gas supply.
2. Turn off the 120V power supply.
3. Turn off the water supply. Drain all water
from the appliance.
4. Loosen the PCB 2 screw from bottom base.
5. Pull out the PCB. (refer to 8.2.1 PCB)
6. Pull out the pump.
(refer to 8.2.16 Circulation Pump)
< Figure 43 >
7. Remove the stainless clip. (fastener "D")
< Figure 44 >
©Navien America Inc. 2010
8. Remove the pipe from 3-way valve.
9. Loosen the 3-way valve 3 screw from
bottom base.
10. Pull out the 3-way valve.
11. Replace with new 3-way valve secured it.
12. Tighten the 3-way valve 3 screws from
bottom base.
13. Replace the circulation pipe into the 3-way
valve.
14. Replace the stainless clip. (fastener "D")
14. Replace the pump.
15. Replace the PCB. (refer to 8.2.1 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 45 >
Version 2.0