IOMM Starter 17
NOTES for Wiring Diagram
1. Compressor motor starters are either factory-mounted and wired, or shipped separate
for field-mounting and wiring. If provided by others, starters must comply with McQuay
specification 359AB99. All line and load side power conductors must be copper.
2. If starters are freestanding, then field control wiring between the starter and the control
panel is required. Minimum wire size for 115 Vac is 12 GA for a maximum length of 50
feet. If greater than 50 feet, refer to McQuay for recommended wire size minimum.
Wire size for 24 Vac is 18 GA. All wiring to be installed as NEC Class 1 wiring system
and must be made with copper wire and copper lugs only. All 24 Vac wiring must be
run in separate conduit from 115 Vac wiring.
3. Main power wiring between starter and motor terminal is factory-installed when chillers
are supplied with unit-mounted starters.
4. For wye-delta, and solid state starters connected to six (6) terminal motors (low
voltage), the conductors between the starter and motor carry phase current and wire
size selection is based on 58 percent of the motor rated load amperes (RLA). Wiring
of free-standing starters must be in accordance with the NEC and connection to the
compressor motor terminals shall be made with copper wire and copper lugs only.
Main power wiring between the starter and motor terminals is factory-installed when
chillers are supplied with unit-mounted starters.
5. The “Full Metering” option will require some field wiring when free-standing starters are
used, as shown in
Figure 4 on page 15.
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