11.4.1 Cleaning the fan, non-return valve and venturi
1. Push back the safety slides on both sides of the power plug to unlock
it.
2. Remove the electrical connections from the fan.
3. Unscrew the bolts from the extension piece under the fan.
Support the gas control valve, using a block of wood for example.
4. Disconnect the air supply hose from the venturi.
5. Unscrew the nuts on the fan output.
6. Disconnect the fan from the adaptor.
7. Clean the fan with a soft plastic brush.
8. Clean the venturi with a soft plastic brush.
9. Inspect the non-return valve.
9.1. Replace the non-return valve if it is faulty or seriously
damaged.
9.2. Clean the non-return valve with a soft plastic brush or
compressed air if it does not need to be replaced.
10. Reassemble the unit in reverse order.
Important
Reconnect the fan's electrical connection.
11.4.2 Replacing the ionisation/ignition electrode
The ionisation/ignition electrode must be replaced if:
The ionisation current is < 3 µA.
The electrode is damaged or worn.
The specific maintenance activities are carried out.
Fig.125 Disassembling the fan unit
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2
1
3
4
5
Fig.126 Cleaning the fan and venturi
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6
7
8
Fig.127 Checking and cleaning the non-
return valve
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9
9.2
11 Maintenance
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C 340 / C 640
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