10.3.7 Checking the burner and cleaning the heat exchanger
1. Remove the air inlet flue on the venturi.
2. Loosen the gland on the gas valve unit.
3. Remove the plugs from the fan.
4. Remove the plugs from the gas valve unit.
5. Remove the ignition electrode plug from the ignition transformer.
6. Remove the front plate from the heat exchanger.
7. Carefully lift the front plate, including the burner and fan, away from
the heat exchanger.
8. Use a vacuum cleaner fitted with a special endpiece (accessory) to
clean the top part of the heat exchanger (combustion chamber).
9. Thoroughly clean with the vacuum cleaner again without the top
cleaning brush on the endpiece.
10. Check (e.g. using a mirror) whether any visible contamination has
been left behind. If it has, remove it with the vacuum cleaner.
11. Clean the lower section of the heat exchanger with the special
cleaning blade (accessory).
12. Burner maintenance is almost never required; it is self-cleaning:
If necessary, carefully clean the cylinder-shaped burner with com
pressed air.
Check that the burner cover of the dismantled burner is free from
cracks and/or damage. If not, replace the burner.
13. Reassemble the unit in the reverse order.
Caution
Remember to reconnect the fan plug.
Check that the gasket is correctly positioned between the mixing
elbow and the heat exchanger (the gasket must lie absolutely
flat in the appropriate groove to ensure that no gas can leak).
14. Open the gas supply and switch the power supply to the boiler back
on.
Fig.61 Checking the burner and cleaning
the heat exchanger
AD-0000087-01
1
3
4
11
8
9
2
5
6
7
10
12
10 Maintenance
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