Technical data

Alpha SY9-24 - Installation

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.

Fig. 14