Technical data

20
7.2 PREPARE FOR SERVICING - Fig. 18
1. Ensure the electrical supply is isolated and the gas supply is off.
2. Remove the two screws securing the top of the front casing. Lift the cover up slightly and remove.
3. Remove the four screws securing the room sealed chamber panel and remove the panel, taking care not to damage the seal.
4. Remove the two fixing screws (one each side) securing the control panel. Close the front cover, raise the complete control
panel slightly, hinging it forward at the same time.
5. Alpha 240XE - Disconnect the electrode leads from the electrodes.
Alpha 240XP - Disconnect the thermocouple and pilot supply from the gas valve. Remove the two screws securing the
pilot assembly to the burner. Remove the pilot shield and withdraw the complete pilot assembly.
6. Remove the five screws securing the combustion chamber front cover and remove the cover.
7. Withdraw the main burner out of the boiler. Take care not to damage the side insulation panels.
Alpha 240XP and 240XE - Routine Servicing
Fig. 18
7.3 CLEANING THE BOILER
1. Remove any deposits from heat exchanger using a suitable soft brush. Do not use a brush with metallic bristles.
2. Check the condition of the combustion chamber insulation panels. Any damaged panels must be replaced. (Refer to
Component Replacement, section 8.23).
3. Check the condition of the burner injectors on the manifold, carefully clean them with a soft brush if necessary.
Do not use a brush with metallic bristles as this might damage the injectors.
4. Remove any fallen deposits from the bottom of the inner case.
5. Unscrew and replace any injector that appears damaged.
6. Clean the top of the burner with a soft brush and check that the flame ports are clear. Blockages may be removed with a
stiffer brush. Tap the burner, open end down, to remove any deposits from inside.
7. Alpha 240XE - Check the condition of the electrodes.
Alpha 240XP - Check the condition of the pilot assembly, removing any carbon deposits from the thermocouple tip.
Disconnect the pilot supply from the pilot burner, carefully withdraw it and remove the injector. Check the condition of the
pilot injector and clean if necessary. Refit the pilot injector over the pilot supply and reconnect it to the pilot burner (see
Fig. 18).
9. Check the spark gap, positioning and height of the electrodes (see Figs. 19 and 20).
10. Check that the fan impeller is clean and free to rotate.
Combustion chamber
front cover
Ignition electrodes
(240XE)
Flame
sensing
electrode
(240XE)
Pilot assy.
Thermocouple
and pilot supply
Alpha 240XP
Control panel
screws
Room sealed
chamber
panel screws
Front casing screws