Ignition And Detection Electrodes And Burner; Function; Removal Of The Ignition And Detection Electrodes; Removal Of The Burner - Biasi Activ A 25C Service Manual

18 Ignition and 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 de-
tects the presence of the flame.
H
B
A
H
C
G
Fig. 18.1
The burner D is fitted on the rear of the fan---burner
group A.
Fig. 18.2
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 (see section 2) .
F
H
I
E
D
2 Disconnect the ignition electrodes connector E
and the earth wire F (Fig. 18.1) and disconnect
the detection electrode connector G.
3 Unscrew the screws H and remove the ignition
electrodes B and the detection electrode C
(Fig. 18.1).
4 Assemble the Ignition and detection electrodes
carrying out the removal operation in reverse or-
der.
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 17.2)
2 Unscrew the screws I (Fig. 18.1 ) and remove the
fan---burner duct A.
3 Remove the burner by sliding it forward.
Fig. 18.3
4 Assemble the burner carrying out the removal
operation in reverse order. Ensure the burner is
correctly located by lining up the locating tab
(Fig. 18.3).
Before reassembling ensure the burner gasket is
correctly located.
Warning: After cleaning or replacement as
detailed above, if it deemed necessary to
undertake a combustion analysis, refer to
the appropriate chapter Maintenance of the
installation instructions manual.
18.4

Checks

Check the position of the electrode edges
n
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1 Remove the ignition electrodes (see section 18.2)
2 Check for the correct distance between the me-
tallic edges of the ignition electrode (see
Fig. 18.4).
locating tab
burner gasket
39