58
15 Replacement of Parts
15.25 Heat Exchanger
For access, refer to section 15.1.
Refer to section 15.1 and drain the boiler heating circuit and
the boiler hot water circuit.
Remove the silencer front
Pull forwards to remove.
The silencer is a push t so no tools or xings are required for
its removal or tting, see diagram 13.8.
Remove the ue hood front
Ease the securing clips away from the sump to release the
retaining catch then push the ue hood up to disengage from
the sump, see diagram 13.5.
To remove, swivel ue hood 90° and pull down and out, see
diagram 13.5.
Remove the igniter unit with support bracket
Disconnect the electrical connections and ignition lead.
Release the igniter unit support bracket.
Remove the igniter unit assembly, see diagram 13.9.
Remove the gas valve/fan
Disconnect the tubing nut at the gas valve, see diagram 13.7.
Remove the fan retaining bracket, see diagram 13.10.
To ease removal of the securing nut from the fan retaining
bracket, a at bladed screwdriver can be used in the position
shown and gently levered down as indicated.
Remove the spark electrode plug and earth connection.
Remove the fan and gas valve electrical connections.
Remove the fan and gas valve assembly.
Remove the condensate trap
Remove the drain outlet pipe from the base of the trap, see
diagram 15.1. Remove the condensate drain securing screw
and carefully pull the trap forward, see diagram 13.13.
Remove the heat exchanger
Remove the retaining clip, see diagram 15.12, which secures
the ow pipe brass elbow into the hydroblock. Remove the
retaining clip, which secures the ow pipe into the anged
elbow in the top right hand corner of the heat exchanger, see
diagram 15.14.
Remove the left hand side panel to aid removal of the copper
ow pipe. Note that the minimum clearance from the side
panel is 5mm. Remove the ow pipe.
Undo the union nut connecting the ow pipe to the pump.
Remove the retaining clip from the anged elbow at the right
hand bottom of the heat exchanger, see diagram 15.13.
Remove screws securing the heat exchanger, one on top and
one underneath the heat exchanger, see diagram 15.14.
Lift up heat exchanger slightly to disengage it from its hanging
bracket.
Remove the heat exchanger by pulling forward and tilting
backwards to ease removal complete with sump, return pipe
and anged elbows. Remove the return pipe then discard the
heat exchanger complete with sump and anged elbows.
Diagram 15.13
Diagram 15.12
15558
RETAINING
CLIP
FLOW
PIPE
UNION
NUT
FLANGED
ELBOW
15589
FLOW
PIPE
RETAINING
CLIP
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