Appendices 61
Model
Gas type
G20
G31
[20 mbar]
[37 mbar]
Output
Consumption
Gas flow
Gas flow
Load
Kcal/h
kW
kW
m
3
/h
m
3
/h
NCB500-1.5S/37K
NCB500-2S/41K
Max.
22,360
26.0
26.8
2.870
0.273
Min.
4,040
4.7
4.7
1.986
0.189
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 (
) on the front panel to turn off
the boiler.
2. Disconnect the power supply to the boiler.
3. Turn off both gas and water supply to the boiler.
Note
Wait at least 30 minutes for the heat exchanger to
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.
