31
INSTALLATION
icos system - Installation and Servicing
36
ELECTRICAL CONNECTIONS
A pictorial wiring diagram is shown in Frame 39.
1. Route the mains cable into the bottom rear centre of
the boiler.
2. Wire the permanent live supply into the 5-way remote
plug terminals, L3, N &
.
IMPORTANT. The permanent live is ESSENTIAL in
order for the advanced diagnostic controls to function
correctly.
37
INTERNAL WIRING
Wiring should be 3 core PVC insulated cable, not less
than 0.75 mm
2
(24 x 0.2mm), and to BS 6500 Table 16.
For IE reference should be made to the current ETCI
rules for electrical installations.
Connection must be made in a way that allows complete
isolation of the electrical supply such as a double pole
switch having a 3mm (1/8") contact separation in both
poles, or a plug and socket, serving only the boiler and
system controls. The means of isolation must be
accessible to the user after installation.
WARNING. This appliance MUST be earthed.
A mains supply of 230 V ~ 50 Hz is required.
The fuse rating should be 3A.
All external controls and wiring must be suitable for mains
voltage.
Wiring external to the boiler MUST be in accordance with the
current I.E.E. (BS.7671) Wiring Regulations and any local
regulations.
Ecl 1542
L3
N
L2
L1
Mains Connector
(supplied in hardware pack)
Socket
(fixed to boiler)
Remove link when connecting external programmer.
nm8071
3. Wire the switched live supply into terminal L2 or connect L1
and L2 via external control switching, as shown in Frame
33. In either case, remove the wire link fitted to L1 and L2.
4. Secure the mains lead with the cable clamp.
5. Connect the mains lead connector. Ensure it is fully located.
Note.
Ensure that the lengths of the current carrying conductors are shorter than
the earth conductor so that if the cable slips in its anchorage the current
carrying conductors become taut before the earth conductor.
INSTALLATION
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