CVHE-SVX02M-EN
63
Motor Supply Wiring
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Motor circuit wire sizing by the installer must be made
in accordance with the National Electric Code (NEC) or
any other applicable codes. All wiring to the
CenTraVacâ„¢ chiller motor must be shielded copper,
with insulation rated to a minimum of 15kV.
Three terminals are provided on the chiller for the
connection of power to the motor from the starter.
Power leads to motors must be in multiples of three,
with equal phase representation in all conduits or wire
trays. To limit the effects of corona or ionization with
cables carrying more than 2000V, Trane requires that
the power cable have a metallic shield, unless the cable
is specifically listed or approved for non-shielded use.
If the cable is shielded, the shielding must be grounded
at one end (grounding is typically done at the starter or
supply end).
Care must be taken while routing the incoming cables
to ensure that cable loads or tensions are not applied to
the terminal or premature terminal failure could result.
Motor Terminals
Field-provided, ring-type lugs, with no sharp edges or
corners, must be used by a qualified installer to
connect the power wiring to the motor terminals.
Follow all instructions provided with the field-provided
lugs to ensure proper connections.
IImmppoorrttaanntt:: The use of stress cones is highly
recommended to reduce and control
longitudinal and radial electrical stresses at
the cable ends.
Prior to assembly the terminal stud, nuts, and lug
should be inspected and cleaned to ensure they are not
damaged or contaminated.
The terminal has a copper shaft that is threaded 9/16-
in.-18 UNF2A. Brass nuts are provided on the motor
terminals to retain the lugs, and the final connection
should be tightened to 22 to 25 ft·lb (29.8 to 33.9 N·m)
using a 7/8-in. (22.225-mm) socket on a torque wrench.
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Before beginning wiring and torquing, ensure proper
motor terminal care and do NOT apply any excess
stress.
Ground Wire Terminal Lug
A ground wire lug is provided in the motor terminal
box to allow the field connection of an earth ground.
The lug will accept a field-supplied ground wire of #8 to
#2 AWG. After completing the field connection of
wiring, inspect and clean the motor terminals and
motor housing, and remove any debris before
reinstalling the motor terminal box cover. The cover
must be re-installed onto the motor terminal box and
all bolts installed. Do NOT operate the chiller with the
motor terminal box cover removed or with any loose or
missing cover bolts.
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