40
SERVICING
isar + programmer -
Installation and Servicing
56 BURNER REPLACEMENT
1.
Refer to Frame 52.
2.
Remove the boiler front and sealing panels. Refer to
Frames 44 & 45.
3.
Remove the fan assembly. Refer to Frame 54.
4.
Remove the 6 screws securing the burner (the 3 screws at
the rear are extended to ease access).
5.
Lift off the burner from the combustion chamber.
6.
Fit the new burner, replacing any damaged or deteriorating
sealing gasket.
7.
Reassemble in reverse order.
8.
Check the operation of the boiler. Refer to Frame 52.
Note.
Take care not to disturb the ionisation probes at the
front and rear of the combustion chamber.
55 BURNER INJECTOR REPLACEMENT
1.
Refer to Frame 52.
2.
Remove the boiler front and sealing panels. Refer to Frames
44 & 45.
3.
Disconnect the electrical leads from the fan.
4.
Undo the gas pipe union connection to the injector housing.
5.
Remove the screw retaining the fan mounting bracket.
6.
Remove the fan and venturi assembly
7.
Remove the 2 injector housing screws.
8.
Withdraw the injector housing.
9.
Fit the new injector housing complete with injector.
10.
Reassemble in reverse order, ensuring that the new gas seal
supplied is located correctly in the injector housing.
11.
Check operation of the boiler. Refer to Frame 52.
M
ount
i
ng
brac
k
et
7
E
c
l
2
400
5
I
n
j
ector
F
an
Gas
p
i
pe
un
i
on
time
P R O G R A M M E R
prog
prog
select
select
+
-
nm84
3
4
57 CONTROL THERMISTOR, RETURN THERMISTOR & OVERHEAT ‘STAT REPLACEMENT
1.
Refer to Frame 52.
2.
Remove the boiler front and sealing panels.
Refer to Frames 44 & 45.
3.
Unclip the thermistor / thermostat from the flow / return pipe and
withdraw it from the controls compartment.
4.
Disconnect the electrical leads from the
thermistor / thermostat.
5.
Reconnect the electrical leads and
reassemble in reverse order, ensuring that the
spring clip is securely on the pipe.
6.
Check the operation of the boiler. Refer to
Frame 52.
nm74
0
2
Ionisation
Probes
4
5
6
SER
VICING
202851-1new.pmd
17/11/2006, 07:40
40
