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4. Unscrew the nut of the gas valve unit.
5. Remove the air inlet pipe from the venturi.
6. Unscrew the front plate nuts.
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 end piece (accessory) to
clean the top part of the heat exchanger (combustion chamber).
9. Vacuum again without the top brush on the end piece.
10. Clean the lower section of the heat exchanger with the special
cleaning blade (accessory).
11. Check (e.g. using a mirror) whether any visible contamination has
been left behind. If it has, remove it with the vacuum cleaner.
12. Check that the burner cover of the dismantled burner is free from
cracks and/or damage. If not, replace the burner.
Servicing the burner is usually not necessary, it is self-cleaning. Use
compressed air to carefully blow away any dust.
13. Reassemble the unit in reverse order.
Caution
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.
Remember to reconnect the fan plugs.
Tighten the nut on the gas valve unit with a torque of 27.5 N⋅m.
Tighten the front plate nuts with a torque of 10 N⋅m.
14. Open the gas supply and switch the power supply to the boiler back
on.
Fig.61 Removing the gas and air supply
pipes
AD-3001971-01
4
5
Fig.62 Removing the front plate, fan and
burner
AD-3001179-01
6
7
Fig.63 Cleaning the heat exchanger
AD-3001180-02
8 9
10
11 12
9 Maintenance
7684359 - v.11 - 13122021 53
53


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