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5 - ELECTRICAL CONNECTION
Please refer to the certified dimensional drawings, supplied with
the unit.
5.1 - Power supply
The power supply must conform to the specification on the unit
nameplate. The supply voltage must be within the range specified
in the electrical data table. For connection details refer to the wiring
diagrams.
WARNING: Operation of the unit with an improper supply
voltage or excessive phase imbalance constitutes abuse
which will invalidate the Carrier warranty. If the phase
imbalance exceeds 2% for voltage, or 10% for current, contact
your local electricity supplier at once and ensure that the unit
is not switched on until corrective measures have been taken.
5.2 - Voltage phase imbalance (%)
100 x max. deviation from average voltage
Average voltage
Example:
On a 400 V - 3 ph - 50 Hz supply, the individual phase voltages
were measured to be:
AB = 406 V; BC = 399 V; AC = 394 V
Average voltage = (406 + 399 + 394)/3 = 1199/3 = 399.7 say 400 V
Calculate the maximum deviation from the 400 V average:
The maximum deviation from the average is 6 V. The greatest
percentage deviation is: 100 x 6/400 = 1.5 %. This is less than
the permissible 2% and is therefore acceptable.
(AB)
= 406 - 400
(BC)
= 400 - 399
(A)
= 400 - 394
5.3 - Power connection
Units with one compressor have one connection point
Units with two compressors have two connection pointst
5.4 - Recommended wire sections
Wire sizing is the responsibility of the installer, and depends on
the characteristics and regulations applicable to each installation
site. The following is only to be used as a guideline, and does not
make in any way liable. After wire sizing has been completed,
using the certified dimensional drawing, the installer must ensure
easy connection and define any modifications necessary on site.
The maximum connectable wire section is 2x240mm² per phase.
5.5 - Power cable entry
The power cables can enter the unit control box from above the
unit. A removable aluminium plate on the upper part of the control
box face allows introduction of the cables. Refer to the certified
dimensional drawing for the unit.
16
= 6
= 1
= 6
Motor
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.
TM
Refer to the SmartVu
Control manual and the certified wiring
diagram supplied with the unit for the field control wiring of the
following features:
- Customer interlock
- Remote on/off switch
- Demand limit external switch
- Remote dual set point
- Alarm, alert and operation report
- Evaporator pump control
- Condenser pump control signal (This does not control
condenser pump operation (for this function add option 156
and flow switch).
- Heating/cooling change-over
- Refrigerant leak detection
- Water valve control (option)
- Various interlocks and reports on the Energy Management
Module board (option)
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.
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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