Technical data

25
Alpha 500E - Component Replacement
Ignition electrode
leads
Main PCB
Neon PCB
Earthing terminals
Reset switch
Pressure gauge
Ignition PCB
Fig. 27
Relay PCB
Securing screws
8.17 RESET SWITCH - Fig. 27
1. Gain access as described in section 8.1.
2. Disconnect the wiring from the switch.
3. Remove the five screws securing the complete control box to the control panel.
4. Depress the switch retaining lugs and withdraw the switch from the front of the control box.
5. Re-assemble in reverse order, ensuring that the wiring is connected as follows:-
White to terminals 1 and 3, Black to terminals 2 and 4.
8.18 MAIN PCB - Fig. 27
1. Gain access as described in section 8.1.
2. Remove the ignition PCB as described in section 8.14.
3. Disconnect all the wiring connectors from the PCB.
4. Remove the three fixing screws and carefully withdraw
the board from the spindles of the control knobs.
5. Re-assemble in reverse order. Refer to the Wiring Diagram
on page 30 for connections.
8.19 SUPPRESSOR - Fig. 28
1. Gain access as described in section 8.1.
2. Withdraw the suppressor from the control panel cover.
3. Disconnect the wiring and re-assemble with a new
suppressor. Connect the wiring as follows:-
Mains Brown to L2, Mains Blue to N4, Brown to U1, Blue
to 3U, Green/Yellow to .
8.20 DIVERTER VALVE MOTOR - Refer to Fig. 30
1. Gain access as described in section 8.1.
2. Release the screw securing the motor cover.
3. Release the two screws securing the motor assembly to the valve body and remove the motor assembly.
4. Disconnect the motor's wiring from the wiring harness and remove the motor.
5. Re-assemble in reverse order.
8.21 CLOCK (if fitted) - Refer to Fig. 17
1. Gain access as described in section 8.1.
2. Disconnect the wiring from the clock.
3. Remove the clock retaining screws and withdraw the clock from the control panel.
4. Fit the new clock, and connect the wires as follows:-
Blue to terminal 1, Brown to terminal 2 and Black wires to terminals 3 and 4, (or as per the instructions supplied with the clock).
5. Re-assemble in reverse order. Refer to the User's instructions and the boiler's control cover to set the clock.
Suppressor
Green/Yellow
Blue
Mains
Blue
Brown
Mains
Brown
Fig. 28