Benchmark Alpha InTec 24X Installation And Servicing Instructions page 22

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.
Note:This boiler has been fitted with a mains supply cable.
2.
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 three 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, rem ve 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 the Alpha single channel controls. Do not fit a y two channel controls.
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:-
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 control). Ensure wiring is correct.
6. Replace the terminal block cover. Do not overtighten the fixing scr ws.
7. Leave the control panel open until commissioning procedures have been completed.
22 Alpha InTec C and X - Installation
Terminal block cover
Remove link 1 to 2
when connecting
external controls
Control fixing screws
Relay board
(optional)
Terminal block cover
Mains terminal strip
Remove link 1 to 2
when connecting
external controls
Relay board
(optional)
Rear of control panel
Fig. 24
Rear of control panel
Fig. 23
Grommets
Cable clamps
Grommets
Cable clamps