32
15.9.5
Detach the control unit cover by removing one screw (see figure
53).
15.9.6
The control unit can be pulled forward as far as the slack in the
mains lead will allow.
Do not stress the mains lead.
15.9.7
When replacing the unit make sure that all the leads are correctly
and firmly connected (see wiring diagram figure 31), that no leads are
trapped and that the vacuum tube is firmly connected.
15.10
To Remove the Distribution block
15.10.1
To gain access see section 15.9.
13.10.2
Remove the two screws fixing the block to the control
bracket.
15.10.3
Disconnect the earth lead from the control bracket.
15.10.4
Remove the cover from the air pressure switch (see figure
54)
15.10.5
Disconnect the three leads (Yellow, orange & white) from
the air pressure switch.
15.10.6
Disconnect the two leads (Brown & blue) from the mains
cable connection block.
15.10.7
Replace in the reverse order. Make sure that all the leads are
correctly and firmly connected (see wiring diagram figure 31), that
no leads are trapped and that the vacuum tube is firmly connected.
15.11
To Remove the Air Pressure Switch
15.11.1
To gain access see section 15.9.
15.11.2
Detach the pressure switch from the control bracket by removing
two screws, nuts & washers (see figure 55).
15.11.3
Remove the cover from the air pressure switch (see figure 54)
15.11.4
Disconnect the three leads (Yellow, orange & white) from the air
pressure switch.
15.11.5
Detach the plastic vacuum tube from the pressure switch.
i)
Make sure that the vacuum tube is connected to the shank on
the pressure switch closest to the centre of the appliance (marked ) -
not the shank closest to the control bracket.
ii)
Make sure that all the leads are correctly and firmly connected
(see wiring diagram figure 31) and that no leads are trapped.
15.12
To Remove the Fan
15.12.1
Remove the terminal guard by detaching two screws and
washers.
15.12.2
Detach the weather shield and flue box end plate by
removing two screws (see figure 56).
15.12.3
Disconnect the wiring loom connector inside the top right of
the flue box (see figure 57).
15.12.4
Slide the fan out of the flue box (see figure 57).
15.12.5
Replace in the reverse order.
Figure 57 Fan removal
Figure 56 Weather shield & flue
box end fixings
Figure 55 Pressure switch
fixings
Fig. 54
Figure 53 Control cover fixing
