14 Replacement of Parts
14.12 Silencer assembly (rear)
For access, refer to section 14.1.
Remove the fan/gas valve assembly, see relevant sections.
Pull Silencer rear away from fan/gas valve assembly.
The rear silencer is a push fit so no tools or fixings are re
-
quired for its removal or fitting, see diagram 14.9.
14.13 Spark Electrode
For access, refer to section 14.1.
Remove the spark plug lead and earth lead.
Remove the two securing nuts, see diagram 14.10.
Withdraw the spark electrode by slowly pulling up and leaning
it forward towards the centre of the heat exchanger to ensure
that the electrode does not foul on the hole in the burner cas-
ing.
Check spark gap.
14.14 Burner
For access, refer to section 14.1.
Remove igniter unit, flue hood, fan and gas valve assembly
and spark electrode lead, refer to relevant sections.
Remove the flanged nuts and studs that secure the burner,
note that two studs at the rear also hold the fan clamping
bracket, see diagram 14.11.
NOTE: The burner gasket should be inspected but will not
need replacing unless there are signs of wear or damage.
IMPORTANT: Do not allow fixings, nuts, screws, etc. to fall
into the open flue hood sump, use a temporary cover whilst
removing any parts.
Diagram 14.10
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