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Electrical
Wiring and Conduit
Wire sizes must comply with local and state electrical codes. Where total amperes require larger
conductors than a single conduit would permit, limited by dimensions of motor terminal box, two
or more conduits can be used. Where multiple conduits are used, all three phases must be balanced
in each conduit. Failure to balance each conduit will result in excessive heating of the conductors
and unbalanced voltage.
An interposing relay can be required on remote mounted starter applications when the length of the
conductors run between the chiller and starter is excessive.
Use rated conductors for equipment rated over 2000 volts, 90°C or 105°C.
Power Wiring
WARNING
Only qualified and licensed electricians should perform wiring. Shock hazard exists.
CAUTION
Voltage unbalance is not to exceed 2% with a resultant current unbalance of 6 to 10 times
the voltage unbalance per NEMA MG-1, 1998 Standard. Failure to comply can cause
extensive equipment damage.
Wiring, fuse and wire size (must be in accordance with the National Electric Code (NEC). Standard
NEMA motor starters require modification to meet Daikin specifications. Refer to Daikin Specification
R35999901.
Power wiring to compressors must be in proper phase sequence. Motor rotation is set up for clockwise
rotation facing the motor end with phase sequence of U-V-W or 1-2-3. Care must be taken that the proper
phase sequence is carried through the starter to compressor.
The start-up technician will verify the phase sequence.
NOTE
Connections to terminals must be made with copper lugs and copper wire.
Care must be taken when attaching leads to compressor terminals.
Use only copper supply wires with ampacity based on 75°C conductor rating. (Exception: for equipment
rated over 2000 volts. use 90°C or 105°C rated conductors).
Note
:! Do not make final connections to motor terminals until wiring has been checked and approved by
the authorized startup technician.
CAUTION
Under no circumstances should a compressor be brought up to speed unless proper
sequence and rotation have been established. Serious damage can result if the compressor
starts in the wrong direction. Such damage is not covered by product warranty.
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Summary of Contents for WCT
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