Excel HE C24 User Manual page 41

62 COMBUSTION CHAMBER INSULATION REPLACEMENT
1. Refer to Frame 51.
2. Remove burner assembly. Refer to
Frame 55.
3. Remove the two screws retaining both
left and right hand combustion chamber
side panels.
4. Slide the combustion chamber side
panel insulation from its retention and fit
new insulation panels.
5. Lift rear insulation panel from its
retention and replace with new panel.
6. Remove the front panel insulation
(straighten 2 top retaining clips and lift
from bottom retention return) and replace
with new panel.
7. Reassemble in reverse order.
8. Check the operation of the boiler. Refer
to Frame 50 and 51.
63 PCB REPLACEMENT (MAIN PCB AND EXPANSION PCB)
Note. Antistatic precautions must be observed when
handling the main or expansion PCB.
1. Refer to Frame 51.
2. Remove the boiler front, side and sealing panels. Refer to
frame 44 and 45. Put the control box into the servicing
position. Refer to Frame 46.
3. Carefully remove all push on connectors and earth
connections (main PCB only) from the printed circuit board.
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SERVICING
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4. Remove the PCB from the five plastic supports (main PCB)
or two plastic supports (expansion PCB).
5. Fit new PCB and refit all push on connectors and earth
connections.
6. Reassemble in reverse order.
7. Check the operation of the boiler. Refer to Frame 56 and 51.
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excel HE -
Installation and Servicing
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