Fan and Air pressure switch
33
3
Inspect the venturi device
B
and the connection
pipe
I
. Ensure they are clean.
4
Re---assemble the parts in reverse order of re-
moval.
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.
B
H
I
Fig. 73
17.5
Removal of the Air pressure switch
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.
2
Disconnect the wires from the Air pressure
switch.
3
Remove the pipe from the Air pressure switch.
4
Unscrew the screws which hold the Air pressure
switch to the frame.
5
Assemble the Air pressure switch carrying out the
removal operations in reverse sequence.
Warning: to correctly connect the Air pressure
switch, refer to Fig. 72 and Fig. 69a or Fig. 69b for
the correct wiring.
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.
