Maintaining The Boiler; Cleaning The Boiler; Draining The Boiler - Navien LCB700-21RS Installation & Operation Manual

12. Maintaining the Boiler

12.1 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.
68 Maintaining the Boiler

12.2 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 "2.5 Dimensions" on page 15 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 (
the boiler.
3. Disconnect the power supply from the boiler.
4. Close the oil line valve.
Open Closed
Oil Line
Valve
) on the front panel to turn off