14
Concord CXSD/H -
Installation & Servicing
INSTALLATION
14 ELECTRICAL CONNECTIONS
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.
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.
If no external controls are fitted a link must be fitted
across 'EXT C' terminals.
The boiler provides frost protection via the boiler sensor. If an
external frost thermostat is required contact
Caradon Ideal
Limited.
If the downdraught flue thermostat is to be fitted then the link
(marked TTB) should be removed from the plug-in connector.
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 carrying conductors
become taut before the earthing conductor, if the cable or cord
slips out of the cord anchorage.
The earth connection 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.
Carefully route the electrical leads from the gas valve/ spark
generator behind the LH panel return and secure with clip as
shown.
Fit the plug-in connector into the mains voltage connection box
behind the control box.
INST
ALLA
TION
Summary of Contents for Concord CXSD 40/H
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