12
The power supply must conform to the specification on the
chiller nameplate. The supply voltage must be within the
range specified in the electrical data table. For connections
refer to the wiring diagrams.
WARNING: Operation of the chiller 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 supply at once and
ensure that the chiller is not switched on until corrective
measures have been taken.
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:
(AB) = 406 - 400 = 6
(BC) = 400 - 399 = 1
(CA) = 400 - 394 = 6
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.
Motor
4.5.2 - Selection table of minimum and maximum wire sections for connection by phase to 30HZ/HZV units
2
2
043 1 x 25 XLPE Copper 130 1 x 95 PVC Aluminium 250
1 x 35 XLPE Copper 142 1 x 120 PVC Aluminium 260
1 x 50 XLPE Copper 162 1 x 120 XLPE Aluminium 205
1 x 70 XLPE Copper 168 1 x 150 XLPE Aluminium 210
101 1 x 70 XLPE Copper 168 1 x 150 XLPE Aluminium 210
111 1 x 70 XLPE Copper 168 1 x 185 XLPE Aluminium 220
121 1 x 95 XLPE Copper 178 1 x 240 XLPE Aluminium 225
141 1 x 120 XLPE Copper 185 2 x 95 XLPE Aluminium 195
1 x 150 XLPE Copper 188 2 x 120 XLPE Aluminium 205
1 x 240 XLPE Copper 192 2 x 185 XLPE Aluminium 220
2 x 95 XLPE Copper 172 2 x 240 XLPE Aluminium 225
1 x 150 XLPE Copper 188 2 x 120 PVC Copper 295
2 x 150 XLPE Aluminium 210
1 x 95 XLPE Copper 178 2 x 70 PVC Copper 270
1 x 240 XLPE Aluminium 225
1 x 185 XLPE Copper 190 2 x 95 XLPE Copper 215
2 x 150 XLPE Aluminium 210
1 x 150 XLPE Copper 188 2 x 120 PVC Copper 295
2 x 120 XLPE Aluminium 205
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 guide-
line, and does not make Carrier 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 connections provided as standard for the field-supplied
power entry cables to the general disconnect/isolator switch
are designed for the number and type of wires, listed in the
table below. The calculations are based on the maximum
machine current (see electrical data tables).
For the design the following standardised installation
methods are used, in accordance with IEC 60364, table 52C:
• For 30HZ/HZV units installed inside the building:
No. 13: Horizontal perforated cable conduits and No.
14: closed cable conduit.
The calculation is based on PVC or XLPE insulated cables
with copper or aluminium core. The maximum temperature
is 40°C. The given wire length limits the voltage drop to < 5%.
IMPORTANT: Before connection of the main power cables
(L1 - L2 - L3) on the terminal block, it is imperative to
check the correct order of the 3 phases before proceeding
to the connection on then terminal block or the main
disconnect/isolator switch.
4.5.1 - Field control wiring
Refer to the 30HZ/HZV Pro-Dialog Plus Controls IOM
and the certified wiring diagram supplied with the unit for
the field control wiring of the following features:
• Evaporator pump interlock (mandatory)
• Remote on/off switch
• Remote heat/cool switch
• Demand limit external switch 1
• Remote dual set point
• Alarm report by circuit
• Evaporator pump control
• Condenser pump control
• Remote set point reset or outside air temperature
sensor reset (0-10 V)
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