Electrical Connections; Power Supply; Voltage Phase Imbalance (%); Power Connection/Disconnect Switch - Carrier 30KAV-ZE Series Installation, Operation And Maintenance Instructions

5 - ELECTRICAL CONNECTIONS

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 chiller
nameplate. The supply voltage must be within the range specified
in the electrical data table. For connections, refer to the wiring
diagrams.
WARNING: Operating the chiller with an incorrect supply
voltage or excessive phase imbalance constitutes misuse
which will invalidate the Carrier warranty. If the phase
imbalance exceeds 2% for voltage, or 10% for current, contact
your local electricity supplier and ensure that the chiller 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 with the following values:
AB = 406 V; BC = 399 V; AC = 394 V
Average voltage = (406 + 399 + 394)/3 = 1199/3
= 399.7 (rounded up to 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 therefore acceptable.

5.3 - Power connection/disconnect switch

The units are equipped with a single electrical power connection
point.

5.4 - Power cable access routing

The power cable access routing into the electrical cabinet is from
the side or underneath of the unit: Refer to the plans for the unit.
The choice depends on the installation configuration of the
machine and the specifications of the cables to be connected:
Cable access routing from the side of the unit: This configuration
allows a larger number of cables to be connected and/or for larger
curve radii.
Cable access routing from underneath: This configuration requires
the unit to be raised in relation to the cable routing level
(for example: Fitting on rails and supports). The quantity of
conductors which can be connected, and the bending radius
needed, are also restricted.
The installer is responsible for ensuring the electrical cabinet is
sealed around the power cable access routing. Holes must be
drilled in the plate provided, and the latter must be assembled.
IMPORTANT: Check the bending radius for the cable access
routing underneath the unit. Refer to the certified dimensional
drawing for the unit.
Location of the openings for inserting
motor
Location of the inputs for the
remote control signals
external connections
Access routing for power
supply cables from
underneath or the side
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