31
8.12 TERMINAL BLOCK FUSE - Fig. 32
The fuse is located in the boiler terminal block.
1. Gain access as described in Installation, Section 4.8.
2. Lift out the fuse holder and remove the fuse. Fit a fast blow 2 A fuse as a replacement, ensuring that the holder snaps into
position.
Note: A spare fuse is supplied in the terminal compartment.
3. Re-assemble in reverse order, ensuring the terminal block is located correctly on the plastic pins.
8.13 PCB - Fig. 29
Note: The replacement of the gas valve or PCB must be carried out by a Gas Safe registered engineer with the use of a flue
analyser.
1. Gain access behind the control panel as described in Section 8.1.
2. Disconnect all the wiring connectors from the PCB.
3. Remove the four fixing screws and carefully withdraw the board from the switch spindles.
4. Re-assemble in reverse order. Refer to the wiring diagram in Section 9.1 for connections.
5. Light the boiler and adjust the PCB as described in the instructions supplied with the replacement PCB.
Fig. 32
Terminal block fuse
PCB fuses
PCB
Alpha CD12S/20S/28S - Component Replacement
8.14 CLOCK (if fitted) - Fig. 21
Note: For replacement only use an Alpha two channel clock. Do not fit a single channel clock.
1. Gain access behind the control panel as described in Section 8.1.
2. Remove the two screws securing the clock cover at the rear of the control panel.
3. Disconnect the wiring from the clock.
4. Remove the clock retaining screws and withdraw the clock from the control panel.
5. Fit the new two channel clock, and connect the wires as follows:-
Brown wire to terminal 1, Blue wire to terminal 2, Black wire to terminal 3, Grey wire to terminal 4 and White wire to
terminal 5, (or as per the instructions supplied with the clock).
6. Re-assemble in reverse order. Refer to the instructions supplied with the clock and set the clock to the correct time.
Leave the instructions with the User.
8.15 HEAT EXCHANGER THERMAL FUSE - Figs. 31, 33
Note: If the thermal fuse has failed or operated, the heat exchanger must be replaced. Do not attempt to remove the thermal
fuse. Disturbing the sealant securing the thermal fuse will invalidate the warranty.
1. Gain access behind the front casing as described in Section 8.1.
2. Disconnect the wire from the thermal fuse and remove the heat exchanger as described in Section 8.16.
3. Fit a new heat exchanger and re-assemble in reverse order.
To Next Page
Loading...
