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MCA 35
4
4
1
3
X91
2
6
8
10
11
15/06/12 - 300022160-001-01
7.4.8.
Checking the burner and cleaning the heat
exchanger
CAUTION
5
During inspection and maintenance operations, always
replace all gaskets on the parts removed.
1. Remove the air inlet flue on the venturi.
2. Unscrew the top connection on the gas valve unit.
3. Disconnect the connector located under the fan.
4. Release the 2 clips holding the fan/mixing elbow unit in place on
the heat exchanger.
5. Completely remove the fan/mixing elbow unit.
6. Tilt the burner and remove it, along with the heat exchanger
gasket.
7. Use a vacuum cleaner fitted with a special endpiece (accessory)
to clean the top part of the heat exchanger (combustion chamber).
8. Thoroughly clean with the vacuum cleaner again without the top
cleaning brush on the endpiece.
9. Check (using a mirror, for example) whether any dust can still be
seen. If so, hoover it up.
10.The burner does not require any maintenance, it is self-cleaning.
7
Check that there are no cracks and/or other tears on the surface
of the dismantled burner. If this is not the case, replace the burner.
11.Checking the ignition electrode / ionization sensor.
12.To re-assemble, perform the above actions in reverse order.
CAUTION
9
4
4
13.Open the gas inlet valves and switch on the mains supply to the
boiler.
12
T001220-B
Remember to reconnect the connector to the fan.
Check that the gasket is correctly positioned between
the mixing elbow and the heat exchanger.
(Completely flat in the appropriate groove means it is
leak proof).
7. Checking and maintenance
99
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