Navien NCB-24LSWE, Service Manual

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122 NCB Service Manual Version 1.0
6. Replacement of Parts
6.1 Replacement Procedure
CAUTION
1. When performing maintenance
and/or servicing the boiler,
always turn off the electric
power, gas and water shut-off
valve. Wait for the boiler to
become cool. Be careful to avoid
injury to your fingers on sharp
edges.
2. Drain all water from the boiler
when removing the waterway
components.
3. Before any disassembly, make
sure that all issues and error
codes are properly diagnosed.
4. Handle all parts carefully.
5. When reassembling, prevent any
foreign substance, i.e. dust, etc.
from entering back into the
boiler.
6. After reassembling, check for gas
and water leakage. Then, test for
proper ignition. Make sure that
there is no gas leakage from the
gas connections by testing with
soap bubble solution. Bubbles
indicate a gas leak that must be
corrected.
7. Check the performance and
operation after the boiler has
been serviced.
To remove and replace any parts from the boiler, you will
need a screwdriver that is at least 8 ~ 10 inches long. A
flashlight and magnetic tip are also recommended. Navien
recommends the use of a parts tray to hold small parts and
screws. All of the hardware is essential to the proper
operation of the unit upon re-assembly.
NOTE
When disassembling and
reassembling the boiler, refer the
components diagram & parts list.