Alpha CD24C Installation And Servicing Instructions page 17

3. If an external control, i.e. room thermostat or external clock is to be fitted, remove the terminal block cover and remove the
link between terminals 1 and 2. Pass the cable through the cable clamp and connect it to terminals 1 and 2. Replace the
terminal block cover. (Refer to Section 2.9).
4. Replace the terminal block, ensuring it is located correctly on the plastic pins and replace the cover.
5. Ensure that there is sufficient free cable to allow the control panel to be raised and lowered then tighten the cable clamp screws.
6. Leave the control panel open until commissioning procedures have been completed.
7. Carry out electrical system checks - Short circuit, Polarity, Earth continuity and Resistance to earth with a suitable multimeter.
4.9 FIT THE CLOCK KIT - Fig. 21
Ensure the electrical supply to the boiler is isolated.
Important: Only use an Alpha single channel clock. Do not fit a two channel clock.
1. Remove the two screws securing the clock cover at the rear of the control panel.
2. Remove and discard the clock blanking panel.
3. Insert the clock into the opening and secure in place with the screws supplied.
4. Disconnect the clock wiring from the terminal block and connect it to the clock as follows:-
Blue wire to terminal 1, Brown wire to terminal 2 and Red wires to terminals 3 and 4, (or as per the instructions supplied with
the clock). Ensure wiring is correct.
5. Replace the clock cover. Do not overtighten the fixing screws.
6. Leave the control panel open until commissioning procedures have been completed.
Fig. 21
Alpha CD24C/32C - Installation
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