35
Alpha E-Tec 25R - Routine Servicing
Fig. 7.3
7.3 CLEANING THE ELECTRODES, BURNER AND FAN
1. Check the condition of the burner. Clean carefully using a vacuum or compressed air.
2. Check the condition and gap of the electrodes.
If they are in good condition, remove any oxide deposits using a fine abrasive paper.
If it is necessary to replace the electrode assembly, ensure a new gasket is used.
3. Check that the fan is clean and rotates freely. Carefully clean the impellor with a soft bristle brush if necessary
7.4 CLEANING THE HEAT EXCHANGER (with the condensate trap in place)
1. Remove any deposits from the heat exchanger coils using a suitable non metallic soft brush, then a vacuum cleaner
or water sprayed onto the coils. Ensure all electrical components are protected from water (if used). Any water used to
clean the heat exchanger will drain to the condensate trap.
2. Check the condition of the combustion chamber insulation panels. Any damaged panels must be replaced.
3. Check the condition of the burner injector in the gas valve outlet, carefully clean with a soft brush if necessary - Do not
use a brush with metallic bristles as this might damage the injector. Unscrew and replace the injector should it appear
damaged.
7.5
RE-ASSEMBLE THE BOILER
1.
Important:
Before replacing the combustion chamber front assembly, pour at least 200 cc of water into the coils of the
heat exchanger. This is to ensure the condensate trap is full of water before operating the boiler.
2. Replace the combustion chamber front assembly, ensuring it is correctly located and secure with the four 10 mm nuts
previously removed. Replace seals if necessary.
3. Ensure the injector is in position in the gas valve outlet and re-connect the gas pipe securing it in position with the
spring clips previously removed.
4. Reconnect the fan wiring plug and air pressure tube.
5. Insert the air inlet pipe into the fan and re-fit the screw securing top of the pipe.
6. Re-fit the ignition lead to the electrode.
7. Check all the connections are sound and re-commission, Sections 6.3 and 6.8.
8. Ensure that the room sealed chamber panel seal is intact and in position, replace the panel ensuring it has been
located correctly and secure it in position with the screws previously removed.
9. Raise the control panel and secure in position with the two screws provided.
10. Replace the front case panel and secure in position.
11. Check the operation of the boiler. (Refer to Sections 6.5 and 6.6).
12. Return all controls to their original settings.
To ensure correct and safe operation of the appliance, it is essential that any worn or failed components are replaced with
only genuine Alpha spare parts. Use of non-genuine Alpha spares could invalidate your warranty and may pose a potential
safety hazard.
Combustion chamber
front assembly
Burner
Front panel insulation
Ignition/ sensing electrodes
Insulation panel
clips (3 off)
Electrode to burner
gap 7 mm ± 1 mm
Spark gap between
electrodes 3.5 mm ± 0.5 mm
