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5 - ELECTRICAL CONNECTION
5.6 - Field control wiring
Important: Field connection of interface circuits may lead to
safety risks: any control box modification must maintain
equipment conformity with local regulations. Precautions
must be taken to prevent accidental electrical contact between
circuits supplied by different sources:
• The routing selection and/or conductor insulation
characteristics must ensure dual electric insulation.
• In case of accidental disconnection, conductor fixing
between different conductors and/or in the control box
prevents any contact between the conductor ends and
an active energised part.
Refer to the SmartVu
control manual and the certified wiring
TM
diagram supplied with the unit for the field control wiring of the
following features.
Available as standard:
• Remote on/off switch
• Demand limit external switch
• Remote dual set point
• Alarm and operation report
• Evaporator pump control signal
• Condenser pump control signal. This does not control
condenser pump operation (for this function add option
156 and flow switch).
• Heating/cooling change-over
Available as an option:
• Water valve control
• Various interlocks and reports on the Energy Manage-ment
Module board (option 156)
• Refrigerant leak detection
CCN bus connection
• The permanent connection to the system CCN bus is made
at the terminal provided for this purpose inside the control
box.
• The connection of the CCN service tool is possible at a
socket under the control box, accessible from outside.
16
5.7 - 24 and 230 V power reserve for the user
Control circuit reserve:
After all required options have been connected, the TC transformer
includes a power reserve of 1 A at 24 V a.c. that can be used for
the field control wiring.
A second TCA transformer supplies the 230 V, 50 Hz circuit to
charge a battery for a portable computer at 0.63 A maximum at
230 V. The connection is via an EEC 7/16 type socket (2 poles
without earth) located on the inside front of the control box and
accessible from outside.
Only devices with class II double insulation can be connected at
this socket.
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