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18.9.1 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.
18.9.2 Removing the combustion/door assembly
DO NOT REMOVE the burner door, unless
you have checked the fl ame picture and
the combustion with a fl ue gas analyser
and found a problem. Otherwise it will not
be necessary to remove the burner door.
Warning: The burner door seal (12) and nuts (7)
must be replaced each time the burner door is
removed and at least every 5 years. Note: the
nuts are supplied with the seal.
• Disconnect the spark electrode assembly (6) by removing the
screw (4).
• Remove the gas pipe (17).
• Remove the connectors from the gas valve (1) and the fan
(15).
• Remove the retaining screw of the silencer. Pull the silencer
down 90
O
.
• Loosen the 4 nuts (7).
• Remove the burner group from the heat exchanger (11).
• The studs (8) xed to the heat exchanger must not be
damaged. Should it be damaged, replace the heat exchanger.
• The combustion door assembly insulation should be
inspected and replaced if damaged.
18.9.3 Cleaning the heat exchanger
• Clean the coil (19) in the heat exchanger (11) with water.
18.9.4 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 veri cation or replacement of the burner,
assemble the burner group as described in the following
chapter.
18.9.5 Re-assembling the burner group
• Place the burner group on the heat exchanger (11).
• Progressively tighten 4 nuts (7) in an alternate order.
• Reassemble the silencer.
• Check and replace the bre washer as necessary.
• Connect the gas tube (17).
• Connect the connector (1) to the gas valve (14) and the fan
(15).
• Open the appliance gas input.
• Check the tightness of the gas connection.
18.10 Service completion
• Re-check the combustion, see chapter "Combustion check".
On completion of the service, the "Benchmark" Service Record
sould be completed.
19 Replacement of Parts
• Do not use reconditioned or copy parts, only use original
parts supplied by Heatline.
• If a part is required, contact the Heatline service organisation.
• Please quote the name and serial number of the appliance,
this information will be on the front of the appliance.
• If in doubt seek advice from the local gas company or
Heatline’s own service organisation.
a
Replacement of parts must be carried out by a
competent person approved at the time by the
Health and Safety Executive.
PLEASE NOTE: After changing part of the combustion circuit
ALWAYS check the following:
- The integrity of the ue system and the ue seals,
- The integrity of the boiler combustion circuit and the relevant
seals,
- The operational (working) gas inlet pressure at maximum
rate,
- The gas rate,
- The combustion performance.
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