- 36 -
IGNITIoN AND DETECTIoN ELECTRoDES
18 IGNITIoN AND DETECTIoN ELECTRoDES, BURN-
ER AND SPARk GENERAToR
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 and are connected to the spark generator C.
On the left side is the detection electrode D and it detects the pres-
ence of the flame.
figure 18.1
A
B
C
D
E
f
G
H
I
J
I
J
H
H
The burner K is fitted on the rear of the fan-burner group A.
figure 18.2
k
18.2 Removal of the Ignition and detection electrodes
Warning: isolate the boiler from the mains electricity
supply before removing any covering or component.
1 Remove all the case panels and the sealed chamber lid (see
section "General access and emptying hydraulic circuits" page
5).
2 Disconnect the ignition electrodes connector E and the earth
wire F from the spark generator C (Figure 18.1) and disconnect
the detection electrode connector G.
3 Unscrew the screws H and remove the ignition electrodes B and
the detection electrode D (Figure 18.1).
4 Assemble the Ignition and detection electrodes carrying out the
removal operation in reverse order.
When reassembling the ignition electrodes be sure to connect
correctly the wires to the spark generator (figure 18.3.)
figure 18.3
earth wire
ignition electrodes
wire
C
18.3 Removal of the burner
Warning: isolate the boiler from the mains electricity
supply before removing any covering or component.
1 Remove the air box and the fan (see section "Removal of the Air
box and the Fan" page 35).
2 Remove the Ignition and detection electrodes (see section "Re-
moval of the Ignition and detection electrodes" page 36).
3 Unscrew the screws I (Figure 18.1) and remove the cover of the
combustion chamber.
4 Unscrew the screws J (Figure 18.1) and remove the Air-gas duct
lid.
5 Remove the burner by sliding it forward.
