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page 42).
2 Remove the front insulation panel by sliding it forward (Figure
18.4).
3 Assemble the new front insulation carrying out the removal
operation in reverse order. When fitting the new panel ensure
that the electrodes holes coincide with the holes of the com-
bustion chamber.
Siliconic
gasket
Figure 18 .4
Caution:
After any periodical servicing or disturbance the combustion
chamber silicon seal (Figure 18.4) and the Air-gas duct gasket
(Figure 18.3) must be fully inspected and replaced at the discre-
tion of the service engineer.
After any disturbance to the chamber door seal the appiance
must undergo a full analytical combustion performance check.
18 .5 Removal of the burner
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the air box and the fan (see section "17.2 Removal
of the Air box and the Fan" on page 41).
2 Remove the Ignition and detection electrodes (see section
"18.2 Removal of the Ignition and detection electrodes" on
page 42).
3 Unscrew the screws "H" (Figure 18.1) and remove the cover
of the combustion chamber.
4 Remove the front insulation panel (see section "18.4 Remov-
al of the front insulation panel" on page 42).
5 Unscrew the screws "K" (Figure 18.5) and remove the burner.
6 Assemble the burner carrying out the removal operation in
reverse order. Ensure the burner is correctly located by lining
up the locating tab (Figure 18.5).
IGNITION AND DETECTION ELECTRODES
Combustion
chamber gasket
Front insulation
Burner
gasket
Figure 18 .5
Before reassembling ensure the burner gasket is correctly
located .
Warning: After cleaning or replacement as detailed
above, it is deemed necessary to undertake a com-
bustion analysis as detailed in section "11 .3 Adjust-
ment" on page 30) .
18 .6 Removal of the rear insulation
See warning note at the end of this chapter before to remove
this part .
Attention: Cover the inner of the condensing heat
exchanger to avoid that dirt and debris fall in the
coil .
1 Do the operations of section "18.5 Removal of the burner" on
page 43 from step 1 to step 3.
2 Remove the insulation "L" by pulling it towards the boiler front
(Hung it with a screwdriver tip) (Figure 18.6).
L
Figure 18 .6
Locating tab
Burner
K
- 43 -
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