Glow-worm Flexicom sx - Manual (Page 40)

0020107231_04 - 12/14 - Glow-worm
MAINTENANCE
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Diagram 14.2
15584 14.9 Expansion Vessel
For access, refer to section 14.1.
Drain the boiler heating circuit, refer to section 14.2.
Undo the coupling at the base of the vessel, see diagram 14.2.
Remove the locking screw and spacer from the retaining
bracket at the top of the expansion vessel. Whilst holding and
also pushing down slightly on the vessel, remove the expansion
vessel retaining bracket by unhooking and sliding forward.
The expansion vessel can now be removed by sliding it forward
clear of its support guides.
When re-fitting a new gasket will be required between the
expansion vessel and coupling.
Refill, vent and pressurise the boiler.
Check for leaks.
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 locating
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 12.9, 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 required
for its removal or fitting, see diagram 14.3.
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 12.5.
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 casing.
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 12.9.
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 14.3
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