23
Alpha E-Tec 25R - Installation
5.10 CONNECT THE MAINS SUPPLY - Fig. 23
1.
Gain access to the boiler terminal block by removing one screw at the top centre of the front panel,
then lift up and remove panel. Release the two fixing screws (one each side) securing the control
panel. Lower the control panel. See Fig. 7.1.
Refer to Technical Data, Section 3.5 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 three screws securing the terminal block
cover from the back of the control box (see Fig. 5.14).
Pass the mains supply cable through the grommet and
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 grommet and cable clamp and
connect it to terminals 1 and 2. Replace the terminal block cover. (Refer to Section 3.5).
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.
5.11 FIT ALPHA CONTROLS (standard 240 V clock option) - Fig. 5.15
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, see Fig. 5.14.
2. Remove and discard the blanking panel.
3. Remove the controls terminal block cover.
4. 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.
5. Insert the control into the opening and secure in place with the screws supplied.
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. 5.15
Fig. 5.14
Grommets
Terminal
block cover
Cable clamps
Rear of control panel
Remove link 1 to 2
when connecting
external controls
DHW relay board (optional)
Mains
terminal strip
Rear of control panel
Remove link 1 to 2
when connecting
external controls
Control fixing screws
Blanking panel
Control
Controls terminal
block cover
