24
7.2 PREPARE FOR SERVICING - Fig. 26
1. Ensure the electrical supply is isolated and the gas supply is off.
2. Unscrew the two screws securing the control panel and lower the panel.
3. Remove the four screws securing the front case. Lift the case up and forwards to remove.
4. Disconnect the gas supply pipe union from the manifold.
5. Remove the two screws securing the fan assembly to the combustion chamber front.
6. Remove the two pressure tubes, noting their positions.
7. Disconnect the electrode lead from the ignition generator and the in-line connector to the flame sensing electrode.
8. Remove the four nuts and washers and four screws securing the combustion chamber front assembly and remove the
assembly.
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 8.19).
3. Check the condition of the burner injector on the
combustion chamber front assembly, carefully
clean them with a soft brush if necessary.
Do not use a brush with metallic bristles as this
might damage the injector.
4. Remove any deposits from the heat exchanger
coils. This can be done by suction or water
sprayed onto the coils. Ensure all electrical
components are protected from water. Any
water used to clean the heat exchanger will
drain to the condensate trap.
5. Unscrew and replace the injector should it appear damaged.
6. Remove the four screws securing the burner (see Fig. 27) and remove the burner. Clean 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. Check the condition of the electrodes.
9. Check the spark gap, positioning and height of the electrodes. See Fig. 27.
10. Unscrew the condensate trap drain cap to remove any deposits.
Note: Before removing the cap, ensure that the water released from the trap can be contained to avoid spillage.
The trap will contain no more than 200 cc of condensate water. Replace the drain cap.
7.4 RE-ASSEMBLE THE BOILER
1. Replace the burner, ensuring it is located correctly and secure it in position using the four screws previously removed.
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.
3. Ensure the electrode lead is connected and the grommet is in position in the bottom of the room sealed chamber.
4. Test the connections for gas tightness and re-commission, Sections 5.4 and 5.5.
5. Place the front case panel in position and secure in position with the four screws previously removed, see Fig. 26.
6. Raise the control panel and secure in position with the two screws provided.
7. Check the operation of the boiler. (Refer to Boiler Operation, Section 6).
8. Return all controls to their original settings.
Alpha CD25X/28X - Routine Servicing
Fig. 27
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