Glow-worm cxi and Gas Valve - Manual (Page 40)

40 0020013349-02
Diagram 14.3
SECURING
SCREW (3)
VENTURI
PLATE
11486
Diagram 14.2
12402
ELECTRICAL
PLUG
GAS
VALVE
PRESSURE TEST
POINT
14 Replacement of Parts
14.1 General
Replacement of parts must be carried out by a competent
person.
Before replacing any parts the boiler should be isolated from the
mains electric supply and the gas should be turned off at the
service cock on the boiler, see diagram 7.1.
Unless stated otherwise parts are replaced in the reverse order
to removal.
After replacing any parts always test for gas soundness and if
necessary carry out functional test of the controls.
For replacement of parts the front casing and the inner casing
panel of the boiler will need to be removed. To remove undo the
two screws on the underside of the front casing and lift off. Undo
the two screws on the front of the inner front panel and lift off.
The side panels can be hinged sideways to aid replacement of
parts.
To hinge a side panel undo and remove the three screws
securing each side panel to the boiler, two at the front and one
at the top.
14.2 Spark Electrode
For access, refer to section 14.1.
Remove the spark plug lead, earth lead and two securing
screws. Withdraw the spark electrode carefully from the
combustion chamber, see diagram 12.3.
14.3 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 14.1.
14.4 Ignition Lead
For access, refer to section 14.1.
Refer to diagram 12.6.
Pull the spark plug style connector off the spark electrode and
the spade connector connected to the igniter unit,
see diagram 14.1.
14.5 Gas Valve
For access, refer to section 14.1.
Remove the electrical plug from the gas valve, see diagram
14.2.
Refer to section 12.3 for removal of the fan, gas valve and
burner assembly.
Before removing the gas valve note its position on the fan.
Remove the three securing screws, which fix the gas valve and
plastic swirl plate to the venturi on the fan, see diagram 14.3.
Remove the gas valve.
When re-fitting the gas valve take care as it can be fitted more
than one way.
After re-fitting check the combustion CO
2
and adjust if necessary,
see section 12.6.
After assembly test for gas soundness and purge in accordance
with the current issue of BS6891or in IE, the current edition of
I.S.813 "Domestic Gas Installations".
Diagram 14.1
IGNITER UNIT
IGNITION
LEAD
ELECTRICAL
CONNECTIONS
SECURING
SCREWS (2)
SPADE
CONNECTOR
11492