Appendices 61
4. Using a Phillips screwdriver, re
m
ove four screws (two at the
botto
m
and two at the top) of the front cover asse
m
bly to
gain access to the internal co
m
ponents.
5.
O
nce the front cover is re
m
oved, place it in a safe location to
prevent accidental da
m
age.
6. Loosen the four screws holding the front panel and re
m
ove
the front panel.
Note
When re
m
oving the front panel, label all wires and
m
ake sure all wires are disconnected.
12.2 Cleaning the Heat Exchanger
WARNING
Before cleaning the heat exchanger,
m
ake sure the boiler is
off.
To properly
m
aintain 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
m
inutes for the heat exchanger to
cool down.
Summary of Contents for NCB-24LDWE
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