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18 IGNITION, DETECTION ELECTRODES
AND BURNER
18 .1 Function
Three electrodes are fitted on the fan-burner group.
Two of them, fitted on the right side of the fan-burner group "A",
are the ignition electrodes "B".
On the left side is the detection electrode "C" and it detects the
presence of the flame.
I
H
C
G
D
Figure 18 .1
The burner "J" is fitted on the rear of the fan-burner group "A".
Figure 18 .2
18 .2 Removal of the Ignition and detection elec-
trodes
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove all the case panels (see section "2 General access
and emptying hydraulic circuits" on page 5).
- 42 -
IGNITION AND DETECTION ELECTRODES
A
B
G
E
I
F
J
2 Disconnect the ignition electrodes connector "D" and the
earth wire "E" (Figure 18.1) and disconnect the detection
electrode connector "F".
3 Unscrew the screws "G" and remove the ignition electrodes
"B" and the detection electrode "C".
4 Assemble the Ignition and detection electrodes carrying out
the removal operation in reverse order.
Warning: A new sealing gasket must be used during
refitting of the electrodes on all occasions of re-
moval .
18 .3 Removal of the air-gas duct gasket
See warning note at the end of this chapter before to remove
this part .
H
1 Unscrew the screws "I" (Figure 18.1 - Figure 18.3) and re-
move the Air-gas duct lid.
2 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.
Figure 18 .3
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 .4 Removal of the front insulation panel
See warning note at the end of this chapter before to remove
this part .
1 Remove the Ignition and detection electrodes (see section
"18.2 Removal of the Ignition and detection electrodes" on
Air--- gas
duct gasket
I
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