Technical data

23
8.6 ELECTRODES (Alpha 240XE only) - Fig. 20
Gain access as in section 8.1.
1. Remove the five screws securing the combustion chamber front cover and remove the cover.
2. Disconnect the leads from the electrodes.
3. Withdraw the main burner out of the boiler. Take care not to damage the side insulation panels.
4. Flame sensing electrode
Remove the screw securing the electrode and withdraw the electrode.
Fit the new electrode, ensuring it is positioned correctly (see Fig. 20).
5. Ignition electrodes
Remove the screws securing the electrodes and withdraw the electrodes.
Fit the new electrodes, ensuring they are positioned correctly and the spark gap is correct (see Fig. 20).
Re-assemble
1. Replace the burner, ensuring it is located correctly over the injectors and the four locating pins (two each side).
2. Replace the combustion chamber front cover, ensuring the bottom is correctly located in the burner.
3. Complete re-assembly as described in Routine Servicing, section 7.4 paragraphs 4 to 9.
Alpha 240XP and 240XE - Component Replacement
8.7 MAIN BURNER
1. Remove the burner as described in Routine Servicing, section 7.2.
2. Re-assemble with a new burner as described in Routine Servicing, section 7.4.
8.8 BURNER INJECTORS
1. Remove the burner as described in Routine Servicing, section 7.2.
2. Unscrew the damaged injector and screw in a replacement.
3. Re-assemble as described in Routine Servicing, section 7.4.
Securing
screws
Flame sensing electrode
11 to 12 mm
3 to 3.5 mm
9 to 10 mm
Ignition electrodes
Fig. 20