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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
Carrier in any way liable. After wire sizing has been completed,
using the certied dimensional drawing, the installer must ensure
easy connection and dene any modications necessary on site.
The connections provided as standard for the eld-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 of 30HXC units installed inside the building, the
following standardized installation methods are used, in
accordance with IEC 60364, table 52C:
• No.13: perforated horizontal cable conduit,
• No. 41: closed 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.
8.4.1 - Field control wiring
IMPORTANT: Field connection of interface circuits may lead
to safety risks: any control box modication 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 xing
between different conductors and/or in the control box
prevents any contact between the conductor ends and an
active energised part.
Refer to the 30GX/HXC Pro-Dialog Plus Controls IOM and the
certied wiring diagram supplied with the unit for the eld control
wirting of the following features:
• Evaporator pump interlock (mandatory)
• Remote on/off switch
• Condenser ow switch (eld-supplied)
• Remote heat/cool switch
• Demand limit external switch 1
• Remote dual setpoint
• Alarm report by circuit
• Evaporator pump control
• Condenser pump control
• Remote setpoint reset or outside air temperature sensor reset
(0-10 V)
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