Technical data

Alpha C23/27 - Installation

Fig. 13 - Side flue

4.8 CONNECT THE MAINS SUPPLY - Fig. 14

1. Gain access to the boiler terminal block by releasing

the two fixing screws (one each side) securing the

control panel and lowering the panel. Refer to

Technical Data, section 2.9 for connection details.

2. Note: This boiler has been fitted with a mains supply

cable. However, if it is necessary to fit an alternative

supply cable, ensure the cable clamp that has been

fitted is removed and connect as follows:-

Remove the two screws securing the terminal block

cover from the back of the control box (see Fig. 14).

Pass the mains supply cable through the cable clamp

and connect as follows:- Brown to L, Blue to N and

Green/Yellow to . Ensure correct polarity.

Note: Ensure that the length of the earth wire is

such that if the supply cable is pulled out of its

clamp the live and neutral wires become taut

before the earth wire.

The main terminal block can be removed by pulling

it off the pins to give easy access to the terminals.

Do not switch on the electrical supply at this stage.

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. 15

Ensure the electrical supply to the boiler is isolated.

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. 14