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icos - Installation & Servicing
INSTALLATION
33
GAS CONNECTION
IMPORTANT. The gas service cock is sealed with a non-metallic
fibre washer seal so must not be overheated when making
capillary connections.
Refer to Frame 2 for details of the position of the gas connection.
N.B. The principle of the 1:1 gas valve ensures that the icos
HE range is able to deliver it’s full output at inlet pressures
down to 14mb. However if dynamic pressures below 20mb
are experienced ensure this is adequate for ALL other gas
appliances in the property.
34
BOILER WATER CONNECTIONS
The boiler flow and return pipes are supplied fitted to the
boiler and ready for top connection.
Note.
For heating loads in excess of 60 000 Btu/h use 28mm x
22mm connectors to connect the boiler flow and return
pipes to 28mm.
TOP CONNECTION
Connect the system pipework to the boiler flow and return
pipes.
Note.
The front panel is not fitted at this stage.
A boiler gas supply pipe length of 20m and not less than
15mm O.D. can be connected to the boiler via the gas
service cock union.
Ensure that the gas supply pipe does not foul the boiler
casing.
Refer to Frame 41 for details of the pressure test point
position.
35
ELECTRICAL CONNECTIONS
WARNING. This appliance MUST be earthed.
A mains supply of 230 V ~ 50 Hz is required.
All external controls and wiring MUST be suitable for mains
voltage.
The fuse rating should be 3 A.
Wiring external to the boiler MUST be in accordance with the
current I.E.E. (BS.7671) Wiring Regulations and any local
regulations.
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.
INSTALLATION