Main Gas Valve - Navien NP-180 Service Manual

8.2.9. Main Gas Valve

1. Turn off the gas supply
2. Turn off the 120V power supply
3. Turn off the water supply
4. Loosen the PCB right-side screw from
bottom base
5. Pull out the PCB. (refer to 8.2.8 PCB)
6. Pull out the gas pipe.
(refer to 8.2.9 Manifold)
7. Detach the air pressure feedback tube and
remove the wire harness connector from the
2 solenoid valve and modulating valve.
< Figure 23>
8. Detach the gas pressure sensor tube.
< Figure 24 >
©Navien America Inc. 2010
9. Remove the gas valve screws from the gas
adapter.
10. Pull out the gas valve.
11. Positioned gas valve.
12. Attach the gas valve and secured with
screws.
13. Assemble the air pressure feedback tube,
gas pressure sensor tube and wire harness
connector.
14. Replace the gas pipe. Replace the O-ring
where the assembly attaches to the gas
connection. Make sure the old O-ring
removed and discarded.
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NR/NP series service Manual
< Figure 25 >
Version 2.0