10kV–13.8kV Medium Voltage Installation
D
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious inju-
ry.
All electrical circuits shall be treated as energized until
all lockout-tagout procedures are in place and the cir-
cuit has been tested to verify that it is de-energized. The
medium voltage motor terminal box cover must not be
removed if power is present, or if there is a possibility
that power may be present. Working on energized medi-
um voltage circuits is not an approved practice for nor-
mal HVAC maintenance or service.
10kV–13.8kV Medium Voltage
Motor
The motor is suitable for remote mounted across-the-
line (including circuit breaker starting), primary reactor,
autotransformer, or solid-state starting. Refer to the unit
nameplate for motor data including RLA, LRA, etc.
In all cases of non-Trane supplied starters, the Trane
Engineering Specification for UC800 Starter By Others
(available through your local Trane office) must be fol-
lowed in order to ensure proper function and protection
of the chiller. A disconnecting means and short-circuit
protection must be installed ahead of the starter, unless
they are included as part of the starter. Trane assumes no
responsibility for the design, documentation, construc-
tion, compatibility, installation, start-up, or long term
support of starters provided by others.
Motor Terminal Box
A large steel motor terminal box is provided to allow for
the field connection of the motor power supply wire to
the motor
•
Motor terminal box cover only weight is 55 lb (25 kg)
•
Two 7/8” (22 mm) lifting holes are provided in the
cover.
•
Motor terminal box weight without the cover is 215
lb (98 kg)
•
Two 3/8”-16 weld nuts are provided on the top of the
terminal box to allow the use of properly rated lifting
d-rings if removal is needed for clearance purposes.
Note:
If the box is removed for installation purposes,
the motor terminals MUST be protected against
impact or stress damage. Field fabrication of a
cover or guard is required.
Note:
Dimensions in inches
The motor terminal box is large enough to accommo-
date the use of stress cones. If conduit is applied a
flexible connection of the conduit to the box should be
made to allow for unit serviceability and for vibration
isolation. The cable should be supported or protected
against abrasion and wear on any edges or surfaces. Ca-
ble or conduit openings can be cut at any location in the
box sides, top, or bottom for cable entry. Always ensure
that debris does not remain in the box after cutting cable
entry holes.
Motor Supply Wiring
D
WARNING
Grounding Required!
Follow proper local and state electrical code on
requirements for grounding. Failure to follow code
could result in death or serious injury.
Motor circuit wire sizing by the installer must be made in
accordance with the National Electric Code or any other
applicable codes. All wiring to the CenTraVac motor must
be shielded copper, with insulation rated to a minimum
of 15kV.
Three terminals are provided on the chiller for the con-
nection of power to the motor from the starter. Power
leads to motors must be in multiples of 3, 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.
RELEASED 10/Mar/2020 06:59:20 GMT
