Glow-worm Ultrapower sxi - Manual (Page 44)

44
ELECTRODE
GASKET
SPARK GAP
4mm
SECURING
SCREW
(2 OFF)
EARTH
LEAD
13273
Diagram 14.3
14 Replacement of Parts
14.4 Ignition Lead
For access, refer to section 14.1.
Refer to diagram 12.9.
Pull the spark plug style connector off the spark electrode and
the ignition lead connected to the igniter unit, see diagram
14.2.
14.5 Igniter Unit
For access, refer to section 14.1.
To aid access to the igniter unit, loosen the locknut at the top
of the domestic expansion vessel and slide forward out of its
bracket and put into its service position, see diagrams 12.5
and 12.6.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
14.2.
14.6 Spark Electrode
For access, refer to section 14.1.
Remove the spark plug ignition lead, earth lead, gasket and
two securing screws. Withdraw the spark electrode carefully
from the combustion chamber, see diagram 14.3.
Fit new gasket when replacing.
14.7 Gas Valve
For access, refer to section 14.1.
Remove the electrical plug from the gas valve, see diagram
12.10.
Refer to section 12.4 for removal of the fan, gas valve and
burner assembly.
Before removing the gas valve from the fan note its position
and mark its orientation on the fan and gas valve bodies, this
will help when re-assembling.
Remove the two screws that secure the gas valve to the fan,
see diagram 14.4.
Remove the gas valve.
Fit new gasket when replacing.
After re-fitting check the combustion CO
2
and adjust if
necessary, see section 12 Servicing.
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”.
14.8 Fan
For access, refer to section 14.1.
Refer to section 12.4 for removal of the fan, gas valve and
burner assembly.
Remove the two screws securing the fan to the gas valve.
Remove the fan.
Fit new gasket when replacing.
GAS CONTROL
VALVE
GASKET
SECURING
SCREWS
FAN
13404
Diagram 14.4