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17
Alpha CD90S/115S - Installation
4.7
CONNECT THE MAINS SUPPLY - Fig. 2
1.
Remove the four screws securing the plastic top cover so that it can be lifted slightly at the front edge.
2.
Remove the two fixing screws (one each side at the bottom) securing the case front panel (refer to Fig. 23). Pull the bottom
of the panel outwards while pushing up at the same time and remove the panel then remove the two screws securing the
control panel and lower the panel to gain access to the terminal block. Refer to Technical Data, Section 2.10 for
connection details.
3.
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:-
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.
Do not switch on the electrical supply at this stage.
4.
If any external control, i.e. room thermostat etc. is to be fitted, refer to Fig. 2.
Note: All external control connections are less than 24 volts.
Do not connect
230/240 volts to any of the terminals G to Z on the X86 terminal block or to the X84 terminal block.
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.