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6. Unscrew the two fan nuts.
7. Remove the fan together with the gas valve.
8. Inspect the non-return valve and replace it in the event of a defect or
damage, or if the maintenance kit contains a non-return valve.
9. Reassemble in the reverse order.
Caution
Remember to reconnect the fan plugs.
Tighten the nut on the gas valve unit to a torque of 27.5 N⋅m.
Tighten the fan nuts to a torque of 3.6 N⋅m.
8 Decommissioning
8.1 Decommissioning procedure
Caution
Only qualified professionals are authorised to carry out maintenance work on the boiler and the heating system.
To switch off the boiler temporarily or permanently, proceed as follows:
1. Switch the boiler off.
2. Cut the electrical power to the boiler.
3. Close the gas valve on the boiler.
4. Drain the central heating system or ensure frost protection.
5. Close the door of the boiler to prevent air circulating inside it.
6. Remove the pipe connecting the boiler to the chimney and close the nozzle with a plug.
8.2 Recommissioning procedure
Caution
Only qualified professionals are authorised to carry out maintenance work on the boiler and the heating system.
Should it prove necessary to carry out the recommissioning of the boiler, proceed as follows:
1. Re-establish electrical power to the boiler.
2. Fit and check the flue gas pipe.
3. Fill the siphon with water.
4. Fill the central heating system.
5. Open the boiler gas valve.
6. Start up the boiler.
9 Disposal and recycling
Caution
Only qualified professionals are permitted to remove and dispose
of the boiler, in accordance with local and national regulations.
If you need to remove the boiler, proceed as follows:
1. Switch off the boiler.
2. Cut the power supply to the boiler.
3. Close the main gas valve.
4. Close the water mains.
5. Close the gas valve on the boiler.
6. Drain the installation.
7. Remove the air/flue gas pipes.
8. Disconnect all pipes.
9. Dismantle the boiler.
Fig.41 Checking the non-return valve
AD-3001181-02
2x
6
8
7
Fig.42
MW-3000179-03
8 Decommissioning
38 Gas 120 ACE 7717202 - v04 - 23012023
38


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