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Model
Load
Max.
NCB500-1.5S/37K
NCB500-2S/41K
Min.
12.2 Cleaning the Heat Exchanger
WARNING
Before cleaning the heat exchanger, make sure the boiler is
off.
To properly maintain the boiler, you should clean the heat
exchanger annually.
To clean the heat exchanger:
1. Press the Power button (
the boiler.
Gas type
Output
Kcal/h
22,360
4,040
) on the front panel to turn off
Consumption
kW
kW
26.0
26.8
4.7
4.7
2. Disconnect the power supply to the boiler.
3. Turn off both gas and water supply to the boiler.
Wait at least 30 minutes for the heat exchanger to
Note
cool down.
4. Unfasten the 2 latches (at the top) and remove 2 screws (at
the bottom) to remove the front cover to gain access to the
internal components.
5. Once the front cover is removed, place it in a safe location to
prevent accidental damage.
G20
G31
[20 mbar]
[37 mbar]
Gas flow
Gas flow
m
/h
m
/h
3
3
2.870
0.273
1.986
0.189
Appendices
61
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