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51
14 Replacement of Parts
14.10 Fan/Gas valve assembly
For access, refer to section 14.1.
Undo the tubing nut to remove the gas valve from the gas
pipe and any electrical connections, see diagram 12.6.
Remove the securing nut holding the fan retaining bracket,
press down on burner to ease removal of securing nut. Slide
out the fan retaining bracket.
Lift front of bracket away from stud and pull forward to release
the fan, see diagram 12.9.
Lift fan/gas valve assembly up and forward away from locat-
ing studs.
Remove fan gasket and replace if necessary.
To replace the fan and retaining bracket correctly, insert into
slots on fan clamping bracket, see diagram 12.12, and locate
onto lugs on the burner.
14.11 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 fi
tting, see diagram 12.10.
14.12 Spark Electrode
For access, refer to section 14.1.
Remove the spark plug lead and earth lead.
Remove the two securing nuts, see diagram 12.11.
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.
14.13 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 14.10.
NOTE: The burner gasket should be inspected but will not
need replacing unless there are signs of wear or damage.
IMPORT
ANT: Do not allow fi
xings, nuts, screws, etc. to fall
into the open flue hood sump, use a temporary cover whilst
removing any parts.
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