Cleaning And Inspecting The Non-Return Valve; Replacing The Ionisation/Ignition Electrode - DeDietrich C 330 Series Installation, User And Service Manual

Fig.75 Checking the non-return valve
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Fig.76 Replacing the ionisation/ignition
electrode
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10.3.3

Cleaning and inspecting the non-return valve

1. Remove the electrical connections from the fan. Push the safety slides
on both sides of the power plug right to the back (using a small
screwdriver, for example).
2. Unscrew the bolts from the extension piece under the fan.
Support the gas valve unit, using a block of wood, for example.
3. Unscrew the nuts on the fan output.
4. Disconnect the fan adaptor.
5. Inspect the non-return valve and replace it if faulty or seriously
damaged.
6. If the non-return valve does not need to be replaced, clean it with a
soft plastic brush or compressed air.
7. Reassemble the unit in reverse order.
Caution
Reconnect the fan's electrical connection.
10.3.4

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.
1. Unscrew the 2 screws on the middle top casing.
2. Remove the middle top casing.
3. Remove the plug of the electrode from the ignition transformer.
Important
The ignition cable is fixed to the electrode and therefore may not
be removed.
4. Unscrew the 2 screws on the electrode and pull these forwards.
Caution
Do not fit the new electrode until the burner has been cleaned and
refitted. This will prevent damage occurring.
5. Remove the entire component.
6. Fit the new ionisation/ignition electrode.
7. Reassemble the unit in reverse order.
For more information, see
Cleaning the burner, page 69
10 Maintenance
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