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14.6 Gas Valve
For access, refer to section 14.1.
Remove the electrical plug from the gas valve.
Undo the tubing nut holding the gas pipe to the gas valve.
Remove the three securing screws, holding the gas valve to
the fan and remove the gas valve, see diagram 12.6.
After re-fitting check the combustion CO
2
and adjust if neces-
sary, refer to section 12, Combustion Check.
After assembly test for gas soundness and purge in accord-
ance with the current issue of BS6891or in IE, the current
edition of I.S.813 “Domestic Gas Installations”.
14.7 Flue Hood
For access, refer to section 14.1.
Pull the flue hood securing clips away from the flue hood
sump and push flue hood up slightly towards flue hood top,
see diagram 12.5.
To remove swivel flue hood 90
0
and pull down and out to-
wards front of boiler, see diagram 14.5.
14.8 Fan
For access, refer to section 14.1.
Remove the gas valve as described in the relevant parts of
section 14.6.
Remove the securing nut holding the fan retaining bracket,
lift front of bracket away from stud and pull forward to release
the fan, see diagram 12.9, check and replace any seals or
gaskets if necessary.
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 for-
ward 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 Replacement of Parts
EXPANSION VESSEL
RETAINING BRACKET
EXPANSION VESSEL
COUPLING
LOCKING
SCREW
SPACER
Diagram 14.2
12665
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