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12.0 Changing Components
31
IMPORTANT: When changing components ensure
that both the gas and electrical supplies to the
boiler are isolated before any work is started.
When the new component has been fitted turn the
selector switch fully anticlockwise against the spring
pressure to position R and hold for 2 seconds to
reset the boiler before recommissioning.
See Section 11.1 “Annual Servicing” for removal of case
panel, door etc.
12.1 Fan (Figs. 48 & 49)
1. Note the positions of the two sensing tubes on the
fan spigot (105 model. Only one tube on 80 model) and
three wires on the fan motor and remove them.
2. Slacken the screws on the fan spigot outlet pipe
clamps. Ease the clamps inwards over the pipe (105).
3. On 80 models, undo the securing screw at the left
hand end of the pipe.
4. Draw the outlet pipe away from the boiler.
5. Remove the four screws securing the combustion
box door and remove the door.
6. Ease the front edge of the left hand baffle upwards,
disengaging the spring clip. Disengage the tab on the
baffle from the slot in the fan hood.
7. Undo the screws securing the fan hood to the
appliance back panel, and draw the fan and hood
assembly forwards.
8. Remove the screws and spring washers securing the
fan to the hood.
9. Fit the new fan to the hood using the screws and
spring washers previously removed.
10. Reassemble in reverse order of dismantling.
12.2 Pressure Switch (Fig. 47)
1. Remove the fan as described in section 12.1.
2. Note the positions of the two sensing tubes and three
wires and remove them.
3. Remove the two screws holding the pressure switch
to the bracket on the combustion box top panel.
4. Fit the new pressure switch and reassemble all
components in reverse order of dismantling.
Pressure
Switch
Sensing
Tubes
Pressure
Switch Wires
Fig. 47
b
br
bk
H
+’ve
L
-’ve
Fan Hood
Spring Washer
Securing Screw
Fan Wires
Fan
Sensing
Tubes
Ease Fan Spigot Outlet
Pipe Clamps Inwards
Fig. 48
Fan Spigot Outlet Pipe
Spring Clip
Baffle
Tab
Fan
Fig. 49
(Instant 105 HE
model shown)
105 HE
80 HE