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CTV-PRC007-EN
Unit
Options
Unit-Mounted Starters
Trane factory installed options make
installation of a CenTraVac
™
chiller easier,
faster and less costly. Another example
of the Trane packaged concept is the
factory installed unit-mounted star delta
starter available on CenTraVac chillers up
to 1300 tons capacity or solid-state
starters up to 1000 tons, depending on
jobsite electrical requirements. It’s a
single chiller/starter package designed
for years of reliable operation and low
life-cycle costs.
Installation cost is reduced by eliminating
chiller-to-starter, starter-to-disconnect
and starter-to-control panel field wiring.
All this wiring is completed and tested in
the factory, ensuring electrical integrity.
Since most wiring is factory completed,
electrical system design time is reduced.
Starter components are pre-engineered
and selected to provide a reliable, cost
effective chiller/starter package. This
single source responsibility for the
CenTraVac chiller and unit-mounted
starter package is a real advantage.
Potential scheduling problems
associated with separate starter and
chiller installations are eliminated. When
the CenTraVac chiller arrives at the
jobsite with the unit-mounted starter, the
only remaining wiring is the main power
wiring to the disconnect switch, and a
few simple electrical interlocks to the
chilled water and condenser water flow
sensing devices.
To ensure a trouble-free start-up on the
electrical side, the unit-mounted starter is
tested with the chiller as part of the
factory performance testing program.
Our commitment to customer and
equipment safety offers the Underwriters
Laboratories Inc. (UL) mark of safety on
both chiller and starter and available
accessories.
Compressor Motor Starting Equipment
Features
Trane can provide compressor motor
starting equipment built to rigid Trane
specifications. The types of starters
available include:
Low Voltage (200 to 600 volts)
•
Star (wye)-delta closed transition
•
Full voltage
•
Autotransformer, closed transition
•
Solid-state starters
Medium Voltage (2300 to 6000 Volts)
•
Full voltage
•
Primary reactor, closed transition
•
Autotransformer, closed transition
Medium voltage starters are provided as
standard with a non-load break isolation
switch and current limiting fuses.
All starters provided by Trane include the
following standard features for safe,
efficient application and ease of
installation:
•
NEMA 1 starter enclosure.
•
120 volt, 60 hertz, 1 phase fused pilot
and safety circuits.
•
Control power transformer (4.0 KVA)
with 120 volt, 50 or 60 hertz, single-
phase.
•
One pilot relay to initiate start
sequence from CenTraVac control
circuit signal.
•
Starter enclosures capable of being
padlocked.
•
Automatic transfer from wye to delta
on any two-step starter.
In addition, Trane offers a wide selection
of optional starter features.
•
Starters with standard or high
interrupting capacity circuit breakers,
to provide disconnect means and short
circuit protection (low voltage only).
•
Ammeters and voltmeters.
•
Special function pilot lights.
•
Special NEMA enclosures.
•
Ground fault protection.
•
Power factor correction capacitors.
•
I.Q. Data Plus monitor device.
If the CenTraVac compressor starting
equipment is provided by others, the
starter must be designed in accordance
with the current Trane standard
engineering specification “Water-Cooled
CenTraVac
™
Starter Specification.” It is
also recommended that two copies of
the interconnecting and control circuit
wiring diagrams be forwarded to The
Trane Company for review. This service
is provided at no charge, and is intended
to help minimize the possibility that
Trane CenTraVac chillers will be applied
in improper starting and control
systems. However, the responsibility for
providing proper starting and control
systems must remain with the system
designer and the installer.
Contact your local Trane sales office for
further information.
Unit Mounted
Starter
The typical equipment room layout for a
Trane CenTraVac
™
unit or remote
mounted starter are shown in Figures
O-1 and O-2. A NEMA 1, star-delta (wye-
delta) type closed transition reduced
voltage motor starter is mounted, as an
optional accessory, on Trane CenTraVac
chillers rated up to and including 1080
RLA on low voltage (600 volts and
below) systems. All power and control
wiring between the starter and the chiller
are factory assembled. Factory assembly
enhances total system reliability and
integrity. Total installed chiller/starter
costs are significantly reduced by the
unit mounted starter option rather than a
conventional remote mounted starter.
Benefits
•
Reduces starter installation costs 20 to
35 percent:
•
By eliminating chiller-to-starter field
wiring
•
By eliminating starter-to-disconnect
switch field wiring (when optional
circuit breaker is used)
•
By eliminating field installed
disconnect switch (when optional
circuit breaker is used)
•
By eliminating starter mounting pad
and required equipment room floor
space
•
By eliminating control wiring from
starter to control panel
•
Electrical system reliability is
enhanced:
•
By reducing the number of field
electrical connections
•
By making starter-to-chiller electrical
connections under factory-controlled
conditions
•
By testing the entire chiller/starter
combination, in the factory
•
By providing control components
designed to operate with the unique
CenTraVac motor/compressor start and
protection subsystem
•
Single Source Responsibility
Trane retains complete responsibility
for the starter and associated chiller/
starter interconnecting wiring.