Navien NCB300-28K, Руководство по установке и эксплуатации

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58 Maintaining the Boiler
11.1 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.
11.2 Draining the Boiler
You will need to drain either both the central heating side
and domestic hot water (DHW) side, or one side only before
performing maintenance tasks, such as cleaning the adapter
filter, or to prevent the boiler from freezing when it will not be
used for an extended period.
Refer to the “2.5 Dimensions” on page 16 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.
3. Disconnect the power supply from the boiler.
4. Close the gas valve.
Gas Valve
Opened Closed
5. 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.
11. Maintaining the Boiler