General; Boiler Access; Viewing Window - Glow-worm Ultracom2 sxi Installation And Servicing

19.1

General

The replacement of parts described in sections
b
"Combustion block" will require the removal
of the burner module assembly and the
replacement of seal and self locking nuts.
Replacement parts that have associated components that need
replacing on removal, i.e. 'O' ring, seals, gasket, etc., will need
to be supplied and should be fitted.
• Before replacing any parts of the boiler, isolate from the
mains electric supply and turn off the gas at the gas service
isolation valve on the boiler.
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.
19.2

boiler Access

For replacement of parts, the front 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.
19.3

Viewing window

Key
1 fibre washer
2 Steel washer
3 Glass
4 Steel washer
5 Circlip
• Remove the circlip (5).
• Remove the steel washer (4).
• Remove fibre washer (1).
• Remove the glass (3).
0020112600_02 - 10/12 - Glow-worm
2
1
3
4
5
19.3.1 Expansion vessel
3
2
C
B
1
Key
1 Connector
2 Expansion vessel
3 Upper support bracket
4 Retaining screw
5 Gasket
• Drain the boiler heating circuit as described in the
appropriate chapter "Draining".
• Remove the two screws (4).
• Undo the connector (1) at the base of the vessel.
• Remove upper support bracket (3).
• Remove the expansion vessel (2).
• Fit a new gasket between the expansion vessel and
connector.
• Refill, vent and pressurise the boiler.
MAINTENANCE
A
D
E
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4
2
1