Replacement Of Parts; Replacement Procedure - Navien NP-180 Service Manual

8. Replacement of Parts

8.1 Replacement Procedure

1. When performing maintenance and/of servicing the water heater, always
turn off the electric power, gas and water shut-off valve. Wait for the water
heater to become cool. Be careful to avoid injury to your fingers on sharp
edges.
2. Drain all water from the water heater when removing the water parts.
3. Before any disassembly, make sure you have a good diagnosis.
4. Handle all parts carefully.
5. When reassembling, prevent any foreign substance, i.e. dust, etc. from
being introduced into the water heater.
6. After reassembling, check for gas and water leakage. Then, test ignition.
Make sure that there is no gas leakage in connections by testing with
soap bubble solution. Bubbles indicate a gas leak that must be corrected.
7. Check the performance and operation after servicing.
To remove and replace any parts on this tankless unit, you will need a
magnetic tip screwdriver that is at least 8 ~ 10 inches long. A flashlight and
magnetic tip reach are also handy. Navien recommends the use of a parts
tray or bowl to hold small parts and screws. All of the hardware is essential
to the proper operation of the unit upon re-assembly.
When disassembling and reassembling the water heater, refer the
components diagram & parts list.
©Navien America Inc. 2010
CAUTION
NOTICE
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NR/NP series service Manual Version 2.0