6.5 - Power cable access routing
The power supply must conform to the specication on the chiller
nameplate. The supply voltage must be within the range given in
the electrical data table. For connections refer to the wiring
diagrams and the certied dimensional drawings.
WARNING: operating the chiller with an incorrect supply
voltage or excessive phase imbalance constitutes improper
use and 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
chiller is not switched on until corrective measures have been
taken.
6.6 - Field-installed control wiring
Important: Field connection of interface circuits may lead to
safety risks: any modication to the electrics box must ensure
the equipment remains compliant with local regulations.
Precautions must be taken to prevent accidental electrical
contact between circuits supplied by dierent sources:
- The routing selection and/or conductor insulation
characteristics must ensure dual electric insulation.
- In case of accidental disconnection, conductor xing
between dierent conductors and/or in the control box
prevents any contact between the conductor ends and
an active energised part.
See the SmartVu
TM
control manual for 30RB/30RQ units
and the wiring diagram supplied with the unit for the eld
control wiring for the following functions:
- Evaporator pump interlock (mandatory)
- Remote on/o switch
- Demand limit external switch
- Remote dual set point
- alarm, alert and operation report,
- Heating/cooling selection
6.7 - Electric and power reserve for the user
Control circuit power reserve:
After all possible options have been connected, the CT transformer
ensures the availability of 1 A of power for the control cabling on-
site on 24 V, 50 Hz.
6 - ELECTRICAL CONNECTION
20
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