27
INSTALLATION
isar + programmer -
Installation and Servicing
32 ELECTRICAL CONNECTIONS
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.
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.
A permanent live is ESSENTIAL in order for the
advanced diagnostic controls to function correctly.
33 INTERNAL WIRING
3.
Wire the normal room thermostat switched live supply into
L2 or connect L1 and L2 via external control switching as
shown in Frame 34. In either case remove the wire link
fitted to L1 to L2.
4.
Secure the mains lead with the cable clamp.
5.
Connect the mains lead connector. Ensure it is fully
located.
L3
N
L2
L1
Mains Connector
(supplied in hardware pack)
Socket
(fixed to boiler)
Remove lin
k
when connecting external programmer.
nm8
0
71
Ecl 1
5
42
A pictorial wiring diagram is shown in Frame 35.
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.
INST
ALLA
TION
202851-1new.pmd
17/11/2006, 07:40
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