Glow-worm Ultracom2 sxi - Manual (Page 45)

0020092785_02 - 05/10 - Glow-worm
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18.8.1 Spark electrode
• Disconnect the electrode inlet (3) and the grounding cable (2).
• Remove the 2 spark electrode retaining screws (4).
• Carefully remove the electrode from the combustion
chamber.
• Check that the extremes of the electrode (6) are not
damaged.
• Clean away any accumulation of dirt and check that the
distance between the two electrodes is between 3.5 and 4.5
mm.
• Check that the gasket (5) is not damaged. Replace if
necessary.
18.8.2 Dismantling the burner
b Warning: The gasket (12) must be replaced each
time the burner is dismantled.
• Disconnect the spark electrode connector (6) from the igniter
unit.
• Remove the gas pipe (17).
• Remove the connectors from the gas valve (1) and the fan
(15).
• Remove the retaining screw of the silencer.
• Loosen the 4 nuts (7).
• Remove the burner group from the heat exchanger (11).
• The studs (8) fixed to the heat exchanger must not
be damaged. Should it be damaged, replace the heat
exchanger.
• The burner gate insulation should not be damaged Replace
if damaged.
18.8.3 Cleaning the heat exchanger
• Clean the coil (19) in the heat exchanger (11) with water.
18.8.4 burner control
• The burner (13) does not require maintenance and should
not be cleaned.
• Check that its surface is not damage. Replace the burner if
necessary.
• Following the verification or replacement of the burner,
assemble the burner group as described in the following
chapter.
18.8.5 Re-assembling the burner group
• Place the burner group on the heat exchanger (11).
• Progressively tighten the 4 nuts (7) in an alternate order.
• Reassemble the silencer.
• Connect the gas tube (17) with a new gasket to the burner
group.
• Connect the spark electrode connector (6) to the igniter unit.
• Connect the connector to the gas valve (1) and the fan (15).
• Open the appliance gas input.
• Check the watertightness of the gas connection.
18.9 Service completion
• Re-check the combustion, see chapter "Combustion check".
On completion of the service, the "Benchmark" Service Record
sould be completed.
MAINTENANCE