Replacement Of Parts - Glow-worm Ultracom 38cxi Installation And Servicing

15.1 General
IMPORTANT: The replacement of parts described in sections
15.5 to 15.9 and section 15.12 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
be supplied and should be fitted.
Replacement of parts must be carried out by a competent
person.
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
13.3.
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.
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.
If the appliance site situation has sufficient side clearances
the side panels can be hinged sideways and removed to aid

replacement of parts.

To remove a side panel undo the three screws securing each
side panel to the boiler, two at the front and one at the top.
Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing
the heating flow and return isolating valves, see diagram 8.1.
Attach a length of hose to the drain point and open the drain
valve, see diagram 8.1.
After replacing part, close the drain valve and remove the
hose. Open the heating flow and return isolating valves and
refill, vent and pressurise the heating circuit. See section 12.3.
Check for leaks.
Draining of Boiler Hot Water Circuit
Drain the Domestic Hot Water circuit by closing the cold-water
isolation valve on the wall mounting jig.
Open one or more hot water taps to drain the hot water circuit.
After replacing part open the cold-water isolation valve and
slowly open a hot water tap to remove air. Close the hot water
tap and check for any leaks.
15.2 Spark Electrode
For access, refer to section 15.1.
Refer to section 13.4 for removal.
Supplied By www.heating spares.co Tel. 0161 620 6677
15 Replacement of Parts
53
IGNITER BRACKET
SECURING SCREW
IGNITER
SECURING
SCREWS (2)
BRACKET
ELECTRICAL
CONNECTIONS
PLUG
15.3 Igniter Unit
For access, refer to section 15.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
15.1.
15.4 Ignition Lead
For access, refer to section 15.1.
Pull the spark plug style connector off the spark electrode,
refer to diagram 13.6. and the spade connector connected to
the igniter unit, see diagram 15.1.
IGNITER UNIT
SPADE
CONNECTOR
IGNITION
LEAD
Diagram 15.1