17
Concord CXi -
Installation
14 ELECTRICAL CONNECTIONS
WARNING.
This boiler must be efficiently earthed.
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.
This should serve only the boiler, together with its controls
and pumps. The supply must be wired direct to the boiler
control box and must not be interrupted by any system
controls. The pump(s) and any system controls must be
wired back to the boiler control box.
The mains supply to the boiler must be wired into the
boiler terminals L1, N on the plug-in mains voltage
connector shown below and in Frame 15. The earth must
be wired to the earth post as shown in Frame 13.
The control box incorporates a pump overrun device
which is necessary to dissipate residual heat after plant
shutdown. It is essential that the main pump (or shunt
pump if used) is wired to the pump terminals marked
L2, N on the plug-in mains voltage connector shown
below and in Frame 15. The earth must be wired to the
earth post as shown in Frame 13.
If no external controls are fitted, it is essential that a
link is wired in place of it on the "Mains voltage
connector".
The flow switch should be connected via volt free
contacts to the 'Flow S' terminals. A link may be fitted in
place of the flow switch but the control will not be able to
analyse the faulty flow switch, if such a failure should
occur. Either of the above must be fitted or the boiler will
not operate.
Fit the plug-in connector into the
mains voltage connection box at
the back of the control box and
fasten, using the M4 screws and
washers.
Check that the other 2 plug-in
connectors are fitted into their
respective boxes.
Finally, fit the casing top panel and
push down to locate.
INSTALLATION
INST
ALLA
TION
Any system controls should be connected, via volt free
contacts, to the terminals marked 'EXT C'.
Do NOT connect
an external clock to these contacts or any mains voltage.
All wiring that is associated with the EXT C terminals should
be separated from other current carrying cables by a
minimum of 100mm. It is preferable to have the volt free
contacts as close to the boiler control as possible thereby
avoiding long lengths of cable to the EXT C terminals on
the boiler control panel.
The boiler provides frost protection via the boiler sensor. If
an external frost thermostat is required contact
Caradon
Plumbing Limited.
The internal wiring of the boiler control box is shown in Frame
15.
Wiring should be PVC insulated cable, not less than
0.75mm
2
(24/0.2mm). All fuses must be ASTA approved to
BS. 1362.
The length of the conductors between the cord anchorage
and the terminals must be such that the current conductors
become taut before the earthing conductor, if the cable or
cord slips out of the cord anchorage.
The earth connections MUST NEVER be omitted.
Wire the earths as shown in Frame 13.
All wiring between entry at the rear of the boiler and the
connection box must be secured neatly under the cable clips
provided.
Wiring must never be allowed to come into contact with any
heated surfaces nor should any permanent wiring prevent
the withdrawal of the burner tray for servicing.
Connect the plug from the rear of the controls box to the
High/Low operator on the top gas valve.
Summary of Contents for Concord CXi 110
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