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Installation instructions
Electrical connection
It is important that the mains supply is wired with correct polarity: brown to LIVE, blue to
NEUTRAL.
Warning: This boiler must be earthed.
All system components must be of an approved type.
Connection of the whole electrical system and any heating system controls to the electrical supply
must be through a common isolator.
Isolation should preferably be by a double pole switched fuse spur box having a minimum contact
separation of 3 mm on each pole. The fused spur box should be readily accessible and preferably
adjacent to the boiler. It should be identified as to its use.
A fused three pin plug and shuttered socket outlet may be used instead of the fused spur box,
provided that:
a) They are not used in a room containing a bath or shower.
b) Both the plug and socket comply with the current issue of BS1363.
The mains electrical supply must be maintained at all times in order to provide domestic hot water.
DO NOT INTERRUPT THE MAINS SUPPLY TO THE BOILER WITH A TIME SWITCH OR PRO-
GRAMMER.
The icon 23 t and icon 28 t are delivered with an integral mains supply lead AND an integral
external controls lead.
EXTERNAL CONTROLS
The boiler will work for heating AS
DELIVERED without a room ther-
mostat fitted provided the two wires
on the integral external controls
lead REMAIN LINKED TO-
GETHER
(as supplied).
If a room thermostat is required, it
must be connected to the external
controls lead as shown below, us-
ing a suitable electrical connection.
ANY ROOM THERMOSTAT MUST
BE OF THE VOLTAGE FREE TYPE.
Note: For further information, see The Building Regulations 1991 – Conservation of fuel and power –
1995 edition – Appendix G, table 4b.
ON NO ACCOUNT MUST ANY ELECTRICAL VOLTAGE BE APPLIED TO EITHER OF THE
TERMINALS OF THE WHITE EXTERNAL CONTROLS LEAD
WARNING: This boiler must be wired in accordance with these instructions. Any fault aris-
ing from incorrect wiring may invalidate the terms of the guarantee.
BOILER
BLACK MAINS LEAD
WHITE EXTERNAL CONTROL LEAD
FUSED MAINS
SPUR OR
FUSED 3 PIN
PLUG
VOLTAGE FREE
ROOM THERMOSTAT
617
icon 23 t
icon 28 t
