8 IOMM Starter
Power Wiring
Power wiring between the starter and the compressor motor terminals is field supplied and
installed on units with remote-mounted, free-standing starters. See the field wiring diagram
on page 16.
Wiring, fuse and wire size must be in accordance with the National Electric Code (NEC).
Standard NEMA motor starters require modification to meet McQuay specifications. Refer to
McQuay Specification R35999901.
CAUTION
Important: Voltage unbalance not to exceed 2% with a resultant current
unbalance of 6 to 10 times the voltage unbalance per NEMA MG-1, 1998
Standard. This is an important restriction that must be adhered to.
WARNING
Qualified and licensed electricians must perform wiring.
Shock hazard exists.
Refer to Figure 5 on page 16 for power wiring connections.
Power wiring to compressors must be in proper phase sequence. Motor rotation is set up for
clockwise rotation facing the lead end with phase sequence of 1-2-3. Care must be taken that
the proper phase sequence is carried through the starter to compressor. With the phase
sequence of 1-2-3 and L1 connected to T1 and T6, L2 connected to T2 and T4, and L3
connected to T3 and T5, rotation is proper. See diagram in terminal box cover.
The McQuay start-up technician will check the phase sequence. Note: Do not make final
connections to motor terminals until wiring has been checked and approved by a McQuay
technician.
CAUTION
Connections to terminals must be made with
copper lugs and copper wire.
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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