DeDietrich MCA Pro 115, Installation And Service Manual

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MCA Pro 45/65/90/115 MCA-Pro ISM Rv.4.1 2/2017
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7.4.7. Checking the burner and cleaning the heat
exchanger
DANGER
Electrical shock hazard. Prior to performing boiler
maintenance, make sure to disconnect all electrical
power to the boiler. Failure to do this could result in
severe personal injury, substantial property damage
or death.
CAUTION
During inspection and maintenance operations,
always replace all gaskets on the parts removed.
1. Remove the air inlet flue on the Venturi.
2. Loosen the union on the gas block.
3. Remove the plugs from the fan.
4. Remove the plugs from the gas block.
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 from the heat exchanger.
8. Use a vacuum cleaner fitted with a narrow endpiece
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 (using a mirror, for example) whether any
dust can still be seen. If so, vacuum it up.
11. Clean the lowermost part of the heat exchanger
with the special cleaning knife (accessory).
12. The burner does not require any maintenance, it
is self-cleaning. If necessary, clean the cylindrical
burner using compressed air. 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.
13. Checking the ignition electrode / ionization sensor.
14. The front plate insulation blanket needs to be
inspected. If the installation blanket appears to
damaged or severally burned the installation
blanket must be replaced with part number S54731
15. To re-assemble, the front plate sealed must
be replaced part number S57241. Perform the
assymbly in the revised order as above. actions in
reverse order.
CAUTION
• 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
1
3
4
11
8 9
2
5
6
7
10
12
13
15. Open the gas inlet valves and switch on the mains
supply to the boiler.
Cleaning the heat exchanger water side
Use only approved cleaning products for the MCA
pro boiler. Refer to Section 4.6 Water Connections
for aproved products.