40
14.5
Reassembly of parts removed
for servicing
All parts are replaced in reverse order to
removal.
14.6 Flue
system
-
Check externally to make sure that fl ue
is not blocked
-
Inspect fl ue system to make sure that
all fi ttings are tight and secure.
14.7 Operation
of
fan
-
Switch on electrical supply and turn on
gas.
-
Set selector switch to ‘Winter’
posi-
tion.
-
Light burner by operating external con-
trols (if fi tted) to call for heat.
-
Do not light the boiler without the sealed
chamber cover fi tted
-
Check that fan operates when burner lit
and stops when it goes out.
15 Replacement of parts
Warning!
Before starting the replacement of
parts, read the “Safety instructions”
chapter carefully.
15.1 To
replace
fan
- Slide
fl ue sensing probe insulating boot
away from fan.
-
Pull off both red and white sensing
probe tubes.
-
Disconnect power supply and earth
leads to fan.
•
-
Slacken, but do not remove, two screws
securing fan to rear of fl ue hood.
-
Supporting fan, unscrew and remove
two screws securing fan to front of fl ue
hood.
-
Lower fan from top of boiler then tilt
base of fan to right hand side. Gently
ease fan forwards and out of boiler.
-
Transfer fl ue sensing probe assembly
onto replacement fan.
-
Fit replacement fan in reverse order to
removal.
Note: Ensure white air sensing tube is con-
nected to upper probe and red tube to
lower probe.
15.2
To replace air pressure switch
-
Locate air pressure switch in upper right
hand corner of sealed chamber.
-
Pull off plastic tubes from base of
switch.
-
Remove electrical connections from
switch.
-
Unscrew and remove two screws secur-
ing switch to upper panel and remove
switch.
-
Fit electrical connections to replacement
switch as follows:
NO - BROWN
NC - BLACK
C - BLUE
-
Fit replacement switch in reverse order
to removal.
Important: Refi t red tube to right hand
connector and white tube to left hand
connector.
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