13
xtra
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Installation & Servicing
INSTALLATION
12 GAS CONNECTIONS
The boiler gas supply pipe is terminated in a 1" BSP male
taper connection on the left-hand side of the appliance.
13 ELECTRICAL CONNECTIONS
Warning
. This appliance MUST be efficiently earthed.
A mains supply of 230V 50Hz is required. External controls
should NOT be wired in series with this mains input.
Controlling the mains input in this way will prevent the pump
over-run sequence and may cause damage to the boiler. The
supply wiring MUST be suitable for mains voltage. Wiring
should be 3 core PVC insulated cable NOT LESS than
0.75mm
2
(24 x 0.2 mm) and to BS. 6500, Table 16. The fuse
rating should be 5A for F80-F120 and 7A for F160-F280.
Wiring external to the boiler MUST be in accordance with the
current I.E.E. (BS7671) wiring Regulations and any local
regulations. For Ireland reference should be made to the
current ETCI rules for electrical installations.
Connection should 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 unswitched socket serving only the boiler and
system controls. The means of isolation must be accessible
to the user after installation.
When making mains electrical connections to the boiler it is
important that the wires are prepared in such a way that the
earth conductor is longer than the current carrying conductors,
such that if the cord anchorage should slip the current carrying
conductors become taut before the earthing conductor.
Warning.
Sensor cables must be separated from cables in
the 230V circuit. For this purpose three conduits are provided.
Refer to Frame 15 for terminal strip connections.
14 INSTALLING THE MAINS AND CONTROL WIRING
1.
Route the mains supply in at the rear, through
the right hand conduit.
2.
Route any remote sensor cables similarly
through the left hand lower conduit.
3.
Route mains outputs from optional modulating
sequencer through the left hand upper conduit.
4.
Secure the cables with the cable clamps
provided in the controls box.
A minimum working gas pressure of 15mbar (6" w.g.) must
be available at the boiler inlet with the boiler firing.
Fit a gas supply pipe NOT LESS THAN 1"BSP to the boiler.
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