Technical information

48
Remove the gas supply pipe from the gas
valve.
When refitting the gas valve take care as it can
be fitted more than one way.
After assembly test for gas soundness and purge
in accordance with the current issue of BS6891
or in IE, the current edition of I.S.813 “Domestic
Gas Installations”.
13.6 Fan
For access, refer to section 13.1.
Remove electrical plug.
Refer to section 11.3 for removal of the fan, gas
valve and burner assembly.
Remove the gas valve as described in the relevant
parts of section 13.5.
Remove the venturi plate secured with three
screws and remove the two screws securing the
fan to the gas manifold, see diagram 13.2.
Check the gasket and replace if necessary.
NOTE: The 30 HE fan is secured through an
extension piece with two securing screws,
check and replace any seals or gaskets if
necessary.
13.7 Burner
For access, refer to section 13.1.
Refer to section 11.3 for removal of the fan, gas
valve and burner assembly.
Remove the four screws that secure the burner.
NOTE: THE BURNER WILL REQUIRE A NEW
GASKET WHEN REFITTED.
13.8 Front Insulation
For access, refer to section 13.1.
Refer to section 11.3 for removal of the fan, gas
valve and burner assembly.
Remove burner as per section 13.7.
Remove spark electrode, see section 13.2.
NOTE: THE BURNER WILL REQUIRE A NEW
GASKET WHEN REFITTED.
HEAT
EXCHANGER
Diagram 13.3
WASHER
REAR
INSULATION
SECURING
SCREW
12609
Diagram 13.2
11485
SECURING
SCREW (2)
SECURING
SCREW (3)
GAS
MANIFOLD
FAN
VENTURI
PLATE
18 HE Illustrated
13.9 Rear Insulation
For access, refer to section 13.1.
Refer to section 11.3 for removal of the fan, gas
valve and burner assembly.
Remove securing screw and washer in the centre
of the insulation and withdraw insulation, see
diagram 13.3.