Biasi M96.24SM/B Service Manual page 37

18.4 Inspection and removal of the venturi
device
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1 Remove the fan (section 18.3).
2 Remove the venturi device by unscrewing the
screw H.
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.
Fig. 73
18.5
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
B
detailed above, if it deemed necessary to
undertake a combustion analysis, refer to
the appropriate chapter Maintenance of the
H
installation instructions manual.
I
Fan and Air pressure switch
Removal of the Air pressure switch
35