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Securing
Wires
Screws
Pressure Switch
Sensing Tubes
Flue Seal
Sensing Tubes
Fan
Wires
Fig. 50
Fan Mounting Plate
Flue Seal
Fig. 51
28
Fig. 49
Adaptor Spigot
Fan Elbow
Seal
Fan Hood
Flue Seal
11.0 Changing Components
IMPORTANT: When changing components
ensure that both the gas and electrical
supplies to the boiler are isolated before any
work is started.
See Section 10.0 "Annual Servicing" for removal
of case panel and combustion box door.
11.1
Pressure Switch (Fig. 49)
1. Note the positions of the two sensing tubes
and three wires and remove them.
2. Undo the screws securing the pressure switch
to the combustion box bracket and remove the
switch.
3. Fit the new component in reverse order of
dismantling and connect the sensing tubes and
wires as previously noted (see Service Guidance
label on reverse of front panel).
11.2
Fan
IMPORTANT: The replacement fan may be of
a different type to the original. The mounting
plate accommodates both types and the fitting
procedure is the same.
1. Note the position of the wires and pipes on the
pressure switch and remove them. Note the
position of the fan wires and disconnect them
(Fig. 50).
2. Roll the flue seal back over itself onto the
adaptor spigot (Fig. 51).
3. Undo the screws securing the fan mounting
plate to the hood. Draw the fan and plate
assembly out of the boiler (Fig. 50).
4. Remove the fan securing screws and separate
the mounting plate and fan. Remove the screws
securing the fan elbow to the original fan.
Carefully draw the elbow out, examining the seal
for damage (Fig. 50).
5. Fit the elbow to the new fan, ensuring that the
seal is in position. Secure the new fan to the
mounting plate and reassemble in reverse order
(Fig. 50).
6. Roll the flue seal back over the joint between
the fan elbow and adaptor spigots (Fig. 52).
Fig. 52
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