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icos
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Installation & Servicing
SERVICING
61 HEAT EXCHANGER REPLACEMENT
Refer also to Frame 10, 'Boiler exploded view'.
1.
Refer to Frame 47.
2.
Remove front, bottom and sealing panels. Refer to
Frames 40 & 41.
3.
Remove the control box and place to one side. Refer to
Frame 56.
4.
Attach a length of hose to the drain nipple on the bottom
of the heat exchanger and drain down the boiler.
5.
Remove the fan assembly and place to one side. Refer
to Frame 49.
6.
Remove the burner and place to one side. Refer to
Frame 43.
7.
Remove the ignition and detection electrodes. Refer to
Frames 51 & 52.
8.
Remove the spark generator. Refer to Frame 53.
9.
Release the flue from the turret.
10.
Remove the turret from the boiler. Refer to Frame 15.
11.
Release the silicon tubing from the sample point.
12.
Release the electrical connections to the flue
thermistor.
13.
Release the M5 nut retaining the flue casting spring
clip.
14.
Undo the 2 M5 x 10 flue spring retaining bracket
screws and remove the yoke plate.
15.
Pull the CH return pipe up and out of the heat
exchanger.
16.
Unscrew the M5 x 10 screw retaining the flue casting.
17.
Remove the flue casing.
18.
Unscrew the 2 M5 x 10 screws from the CH flow yoke
plate.
19.
Pull the CH flow pipe up and out of the heat exchanger.
20.
Remove the condensate 'S' trap. Refer to Frame 44.
21.
Unscrew the 2 M5 x 10 screws from the inter panel.
22.
Slide the heat exchanger and inter panel assembly
upwards to disengage and remove from the casing.
23.
Transfer the interpanel to the new heat exchanger.
24.
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 60) before the burner and fan assembly
and before the ignition and detection electrodes are
replaced.
25.
Check the operation of the boiler. Refer to Frame 47.
SER
VICING
200212-10.pmd
9/5/2005, 8:59 AM
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