Navien NCB-180, User'S Information Manual

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12 Maintaining the Boiler
4.1 Cleaning the Boiler
CAUTION
Make sure the boiler is turned off and the power supply is
disconnected before cleaning the boiler. The boiler may
remain hot for several minutes after it is turned off. To prevent
burns, wait until the boiler has cooled down before cleaning.
To clean the boiler, wipe the outside with a damp cloth. Use a non-
acidic, non-abrasive cleaner to remove any surface stains. The front
panel is moisture resistant, but it is not waterproof. Keep it as dry
as possible.
4.2 Draining the Boiler
You will need to drain either both the space heating side
and domestic hot water (DHW) side, or one side only before
performing maintenance tasks, such as cleaning the inlet water
filter, or to prevent the boiler from freezing when it will not be used
for an extended period.
Refer to the “2.2 Parts of the Boiler” on page 6 for details
about part locations.
To drain the boiler:
1. Place a bucket under the boiler, to collect the residual water
inside the boiler.
2. Press the Power button on the front panel to turn off the boiler.
MODE
3. Close the gas valve.
Gas Valve
Opened Closed
4. Close the water supply valve on the inlet to the boiler. If there
is no valve, turn off the water supply at the water main.
4. Maintaining the Boiler