Technical data

16
8. Place the inner flue duct back into the outer duct. Use the inner duct supports to centralise the duct in the outer duct.
9. Fit the flue assembly as described in the previous section. Due to the size of the flue clamps the flue must be fitted from
inside the building.
10. It may be necessary to support the flue with suitable brackets (every metre) when flue lengths approaching the maximum
are used.
4.9 CONNECT THE MAINS SUPPLY - Fig. 16
1. Gain access to the boiler terminal block by removing the
two fixing screws (one each side) securing the control
panel. Lower the control panel forwards on its hinge. Refer
to Technical Data, section 2.9 for connection details.
2. Remove the screw securing the terminal block cover from the
back of the control box (see Fig. 16). Pass the mains supply
cable through the cable clamp, terminal block grommet 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, through the grommet (cut as necessary) and connect it to terminals 1 and 2. (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.
4.10 FIT THE CLOCK KIT - Fig. 17
Ensure the electrical supply to the boiler is isolated.
1. Remove and discard the clock blanking panel.
2. Insert the clock into the opening and secure in place with the screws supplied.
3. Disconnect the clock wiring from the terminal block and connect it to the clock as follows:-
Black wires to terminals 3 and 4, Brown to terminal 2 and Blue to terminal 1, (or as per the instructions supplied with the clock).
Ensure wiring is correct.
4. Leave the control panel open until commissioning procedures have been completed.
Alpha 500E - Installation
Cable clamps
Terminal block
cover
Fuse F2A
Remove link to
connect external
control
Fig. 16
Fig. 17
Clock
Control panel
Terminal without clock fitted