Technical data

ManualsBrandsBenchmark ManualsBoilerAlpha InTec 12SLPG

4.10 CONNECT THE MAINS SUPPLY - Fig. 23

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 2.6 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. 23). 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 2.6).

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.

4.11 FIT ALPHA CONTROLS (standard 240 V clock option) - Fig. 24

Ensure the electrical supply to the boiler is isolated.

IMPORTANT - Only use an Alpha two channel clock. Do not ﬁt a single channel clock.

1. Remove the three screws securing the terminal block cover at the rear of the control panel.

2. Remove and discard the blanking panel.

3. Insert the control into the opening and secure in place with the three screws supplied.

4. Remove the terminal block cover.

5. Disconnect the control wiring from the terminal block and connect it to the control 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 control). Ensure wiring is correct.

6. Replace the terminal block cover. Do not overtighten the ﬁxing screws.

7. Leave the control panel open until commissioning procedures have been completed.

Fig. 24

Alpha InTec S - Installation

Fig. 23

Grommets

Terminal block cover

Cable clamps

Rear of control panel

Remove link 1 to 2

when connecting

external controls

Relay board

(optional)

Mains terminal strip