Glow-worm Flexicom hx - Manual (Page 39)

0020107230_04 - 12/14 - Glow-worm
MAINTENANCE
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Diagram 14.1
14 Replacement of Parts
14.1 General
Replacement of parts must be carried out by a competent
person approved at the time by the Health and Safety
Executive.
Replacement parts that have associated components that need
replacing on removal, ie. ‘O’ ring seals, gasket, etc; will be
supplied and should be fi tted.
Before replacing any parts the boiler should be isolated from
the mains electric supply and the gas should be turned off at the
gas service isolation valve on the boiler, see diagram 14.1.
Ensure that components with electrical connections are
disconnected before removal.
Unless stated otherwise parts are replaced in the reverse order
to removal.
After replacing any parts always test for gas tightness and if
necessary carry out functional test of the controls.
For replacement of parts the front casing of the boiler will
need to be removed. To remove undo the two screws on the
underside of the front casing and lift off.
The side panels can be removed to aid replacement of parts.
To hinge a side panel undo and remove the four screws
securing each side panel to the boiler, two below and two at the
top.
14.2 Igniter Unit
For access, refer to section 14.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram 12.9.
14.3 Ignition Lead
For access, refer to section 14.1.
Pull the spark plug style connector off the spark electrode and
the spade connector connected to the igniter unit, see diagrams
12.6 and 12.9.
14.4 Silencer Assembly (front)
For access, refer to section 14.1.
Pull forwards to remove.
The silencer is a push fi t so no tools or fi xings are required for
its removal or fi tting, see diagram 12.8.
14.5 Gas Valve
Remove the three securing screws, holding the gas valve to the
fan, see diagram 12.7.
Remove the gas valve.
After re-fi tting check the combustion CO2 and adjust if
necessary, refer to section 12.1, Combustion Check.
After assembly test for gas tightness and purge in accordance
with the current issue of BS6891or in IE, the current edition of
I.S.813 “Domestic Gas Installations”.
14383
14.6 Flue Hood
For access, refer to section 14.1.
Pull the fl ue hood securing clips away from the fl ue hood sump
and push fl ue hood up slightly towards fl ue hood top, see
diagram 12.5.
To remove swivel fl ue hood 90
0 and pull down and out towards
front of boiler.
14.7 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 12.7.
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 12.10.
Lift fan/gas valve assembly up and forward away from locating
studs.
Remove fan gasket and replace.
To replace the fan and retaining bracket correctly, insert into
slots on fan clamping bracket and locate onto lugs on the
burner, see diagram 12.10.
14.8 Silencer assembly (rear)
For access, refer to section 14.1.
Remove the fan/gas valve assembly, see section 14.7.
Pull Silencer rear away from fan/gas valve assembly.
The rear silencer is a push fi t so no tools or fi xings are required
for its removal or fi tting, see diagram 12.11.
14.9 Spark Electrode
For access, refer to section 14.1.
Remove the spark plug lead and earth lead.
Remove the two securing nuts.
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, see diagram 12.6.