1. Undo the 3 bolts from the adapter on the non-return valve holder (15
Nm torque).
2. Undo the 3 nuts from the adapter on the heat exchanger (15 Nm tor
que).
3. Carefully remove the adapter with burner from the heat exchanger.
4. Remove the 4 bolts from the fan and remove the non-return valve
holder (5.5 Nm torque).
5. Check whether traces of condensation are visible on the inside of
the fan. Replace the non-return valve if there are visible traces of
condensation.
6. Inspect the non-return valve and replace it in the event of a defect or
damage.
7. When replacing the non-return valve, loosen the fixing screw of the
non-return valve and remove it.
8. Reassemble in the reverse order.
Caution
Use the specified torques when fitting nuts and bolts.
Make sure the gaskets are in place when fitting nuts and bolts.
10.4.3 Reassembling the boiler
1. Fit all removed parts in the reverse order.
2. During inspection or maintenance work, always replace all gaskets
of the disassembled parts.
3. Check the tightness of the gas and water connections.
4. Put the boiler back into operation.
Fig.52
Checking the non-return valve
AD-0000134-02
1
3
5
4
4
2
Fig.53
Putting the boiler into operation
AD-0000132-01
Check
Contrôler
Check
Contrôler
10 Maintenance
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