10.3.8 Insulation
1. Remove the Detection/spark ignition electrode.
See
Detection/spark ignition electrode, page 57.
2. Hinge the control box down.
3. Hinge down the air/gas cover and disconnect all wiring plugs from the
PCB, noting their positions. Close the air/gas cover.
4. Undo the nuts holding the combustion chamber/burner door cover to
the heat exchanger.
5. Undo the gas valve nut.
6. Draw the combustion chamber/burner door with the air/gas unit away.
7. Remove the cover insulation piece.
8. Fit the new insulation piece carefully over the burner and align it with
the slot for the electrode.
9. If the rear insulation requires replacement, remove it and all debris
from the heat exchanger.
10. Examine the cover seal and replace if necessary. Reassemble in
reverse order.
10.3.9 Heat exchanger
1. Remove the boiler front panel.
2. Hinge down the controls door.
Warning
Ensure all wiring and electronics are protected before draining
down.
3. Close the flow and return isolation taps.
4. Drain the primary circuit using the drain point provided.
5. Remove the flue thermistor.
6. Remove the condensate trap by lifting clear and pulling forward.
7. Disconnect the flow and return overheat thermistor.
8. Disengage the wires from the securing clip and move to one side.
9. Hinge down the air/gas cover and disconnect the wiring from the PCB.
Remove the air gas unit.
10. Remove the flow pipe by disengaging the clips and easing the pipe
down.
Warning
Care must be taken to avoid damage due to residual water in the
heat exchanger.
11. Remove the return pipe by disengaging the clip to the heat exchanger
and the screw at the rear of the pump. Rotate the pipe to allow
removal of heat exchanger.
12. Disconnect the condensate pipe from the condensate trap spigot.
Important
Disconnecting the condensate system may ease trap removal.
13. Ease the rear condensate trap from the heat exchanger and remove.
14. Whilst supporting the heat exchanger, disengage the clip from the
front. Ease the heat exchanger down and away from the boiler.
15. Reassemble in reverse order.
Warning
Care must be taken with the heat exchanger support/spring clip
when reassembling. Ensure the guides on the rear of the heat
exchanger engage fully with the 2 retaining tags on the boiler
chassis.
Fig.59
Removing the insulation
PN-0000528
Fig.60
Heat exchanger location bracket
PN-0000529
10 Maintenance
60
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Содержание Combi 200
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