Glow-worm Ultimate c - Manual (Page 46)

0020167175_01 - 02/13 - Glow-worm
18.5.1 Spark electrode
•
Disconnect the electrode cap (7) and the earthing cable (6).
•
Remove the 2 spark electrode retaining screws (8).
•
Carefully remove the electrode (10) from the combustion
chamber.
•
Remove the gasket (9).
•
Check that the distance between the 2 electrodes is between
3.5 and 4.5 mm.
•
Install the electrode and a new gasket.
18.5.2 Igniter unit
•
Remove the ignition lead (2).
•
Remove electrical connections (4).
•
Loosen the screws (3) located on the igniter unit (2).
•
Remove the igniter unit (2).
18.5.3 Removing the combustion/burner door
assembly
b ATTENTION:
The burner door seal (13) must be replaced each time
the combustion/burner door assembly is removed.
•
Disconnect the spark electrode cap (7) from the igniter unit.
•
Disconnect the gas supply pipe (36) at the gas valve.
•
Remove the electrical connectors from the gas valve (37) and
the fan (34).
•
Remove the retaining screw of the silencer.
•
Loosen the 4 nuts (12).
•
Remove the combustion/burner door assembly from the heat
exchanger (11).
•
The studs (19) must not be damaged. If damaged you will need
to replace the heat exchanger.
•
The combustion/burner door assembly insulation should be
inspected and replaced if damaged.
18.5.4 Burner
•
Remove the 3 burner retaining screws (16).
•
Remove the burner (15) and the gasket (14).
•
Fit the new burner and the new gasket.
18.5.5 Heat exchanger
b ATTENTION:
There will be water in the heat exchanger.Carefully ease
heat exchanger out.
•
Drain the boiler heating and hot water circuits as described in
the appropriate chapter "Draining".
•
Remove the fl ue connection.
•
Undo the two screws located on the top of each side panel.
•
Remove the thermal fuse connector (20).
•
Remove the 2 heating pipe retaining clips (25) and (29).
•
Release the heating pipes (24) and (27) from the heat
exchanger.
•
Release the condensate trap pipe from the heat exchanger.
•
Remove the combustion/burner door assembly (11) refering to
chapter "Removing the combustion/burner door assembly".
•
Unscrew the 4 retaining screws (17) and (23) and remove the 2
retaining plates (18) and (22) from the heat exchanger.
•
Pull the heat exchanger towards you to extract it from its 2 side
rails.
18.5.6 Re-assembling the burner group
•
Place the burner assembly on the heat exchanger (21).
•
Progressively tighten the 4 nuts (12) in an alternate order.
•
Reassemble the silencer.
•
Connect the gas pipe (36) with a new gasket to the burner
group.
•
Connect the spark electrode connector (5) to the igniter unit.
•
Connect the connector to the gas valve (37) and the fan (34).
•
Open the appliance’s gas input.
•
Check the tightness of the gas connection.
18.5.7 Heating Flow Thermistor
•
Remove the electrical connections from the thermistor (28).
•
Remove the retaining clip from the fl ow pipe (27).
i IMPORTANT:
When reconnecting, the polarity of the wiring to
thermistors is not important.
18.5.8 Heating Return Thermistor
•
Remove the electrical connections from the thermistor (26).
•
Remove the retaining clip from the return pipe (24).
i IMPORTANT:
When reconnecting, the polarity of the wiring to
thermistors is not important.
MAINTENANCE
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