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SERVICING
isar + programmer -
Installation and Servicing
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Refer also to Frame 8 - 'Boiler Exploded View'.
IMPORTANT
Before starting the removal procedure, protect the gas and
electrical controls with a waterproof sheet or plastic bag.
1.
Refer to Frame 52.
2.
Remove the boiler front, bottom and sealing panels.
Refer to Frames 44 & 45.
3.
Drain the boiler. Refer to Frame 72.
4.
Remove the control box and place on one side. Refer to
Frame 66.
5.
Remove the fan / venturi assembly and place on one
side. Refer to Frame 47.
6.
Remove the burner and place on one side. Refer to
Frame 48.
7.
Remove the ignition and detection electrodes. Refer to
Frames 58 & 59.
8.
Remove the spark generator. Refer to Frame 60.
9.
Release the flue from the turret. Refer to Frame 26.
10.
Remove the turret from the boiler. Refer to Frame 26.
11.
Release the silicone tubing from the sampling point.
12.
Release the electrical connection to the dry fire
thermistor.
13.
Remove the M5 nut retaining the flue casting spring clip
and remove the spring clip.
14.
Undo the 2 M5 x 10 flue spring clip retaining bracket
screws and remove the bracket.
15.
Remove the M5 x 10 screw retaining the flue casting.
16.
Remove the flue casting.
76 HEAT ENGINE REPLACEMENT
17.
Remove the automatic air vent. Refer to Frame 71.
18.
Remove the edge clip securing the dry fire thermistor
wiring.
19.
Remove the blind grommet to gain access to the return
pipe securing bracket.
20.
Remove the M5 screw and remove the return pipe
securing bracket by sliding forwards.
21.
Remove the overheat thermostat and the control
thermistor. Refer to Frame 57.
22.
Remove the securing pin to release the flow pipe.
23.
Remove the condensate ‘S’ trap. Refer to Frame 64.
24.
Remove the 2 M5 screws securing the interpanel to the
back panel.
25.
Slide the heat exchanger and interpanel assembly upward
to disengage and remove from the casing, complete with
the flow pipe.
26.
Remove the 2 M6 countersunk screws, remove the
interpanel and transfer to the new heat exchanger.
27.
Remove the M5 screw and remove the flow pipe securing
bracket.
28.
Remove the flow pipe and transfer to the new heat
exchanger.
29.
Reassemble in reverse order, replacing gaskets or seals
if any sign of damage or deterioration is evident.
Note.
The heat exchanger is supplied with new combustion
chamber insulation boards. These should be fitted (refer
to Frame 63 before the burner and fan / venturi
assembly and before the ignition and detection
electrodes are replaced).
30.
Refill the boiler. Refer to Frame 31.
31.
Check operation of the boiler. Refer to Frame 52.
SER
VICING
202851-1new.pmd
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