Glow-worm Ultracom hxi - Manual (Page 38)

0020107233_00 - 06/11 - Glow-worm
MAINTENANCE
- 38 -
13 Replacement of Parts
13.1 General
IMPoRTanT: The replacement parts described in sections
13.5 to 13.9 and section 13.12, will require the removal of the
burner module assembly and the replacement of the burner
door seal and self locking nuts.
Replacement parts that have associated components that
need replacing on removal, i.e. ‘O’ ring, seals, gasket, etc.,
will be supplied and should be fitted.
Replacement of parts must be carried out by a competent
person approved at the time by the Health and Safety
Executive.
Before replacing any parts of the boiler it 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 10.1.
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.
boiler access
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 and removed 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.
13.2 Spark electrode
For access, refer to section 13.1.
Refer to section 11.2 for removal.
13.3 Igniter Unit
For access, refer to section 13.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
13.1.
13.4 Ignition lead
For access, refer to section 13.1.
Refer to diagram 11.4 and 11.5.
Pull the spark plug style connector off the spark electrode and
the spade connector connected to the igniter unit.
13.5 Gas Valve
For access, refer to section 13.1.
Refer to section 11.3 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
13.2.
Withdraw the gas valve.
After re-fitting check the combustion CO
2
and adjust if
necessary, refer to section 11.
Diagram 13.1
13274
13276
VENTURI
PLATE
SECURING
SCREW (3)
Diagram 13.2
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”.