31
Alpha CD13R, 18R, 24R - Component Replacement
8.12 VIEWING WINDOW - Fig. 7.1
1. Gain access behind the casing as in Section 8.1.
2. Remove the rubber window frame and remove the damaged glass.
3. Re-assemble in reverse order with a new glass. Ensure the rubber frame is located correctly in the front panel.
8.13 TERMINAL BLOCK FUSE - Refer to Fig. 4.13
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.
3. Re-assemble in reverse order, ensuring the terminal block is located correctly on the plastic pins.
8.14 PCB - Fig. 8.2
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.
8.15 CLOCK (if fitted) - Refer to Fig. 4.14
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 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 User's instructions and the boiler's control cover to set the clock.
8.16 PRIMARY HEAT EXCHANGER - See Fig. 8.3
1. Gain access behind the room sealed chamber panel as described in Section 8.1 and drain the boiler as described in
Section 8.2.
2. Disconnect the gas inlet union from the combustion chamber manifold.
3. Remove the two screws and six nuts and washers securing the combustion chamber front burner assembly and
remove.
4. Remove the overheat thermostat (Section 8.9), flue thermostat (Section 8.10) and unplug the primary temperature sensors
(Section 8.18).
5. Disconnect the condensate drain union.
6. Undo the ¾ " flow and return unions.
7. Remove the four screws securing the heat exchanger retaining brackets and remove the brackets.
8. Slide the heat exchanger forwards from its mounting, being careful not to spill any water onto any electrical components
9. Empty the water from the heat exchanger, remove the two temperature sensors and transfer them to the new heat exchanger.
9. Fit the new heat exchanger to the boiler and re-assemble in reverse order,
Refill the system. (Refer to Commissioning, Section 5.1).
Fig. 8.2
PCB Fuse
PCB
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