| Features and Benefits Unit Options-Unit mounted Starter
The typical equipment room layout for a Trane CenTraVac ®
unit mounted starter is shown in Figure 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
1 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
2 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
3 Single Source Responsibility
Trane retains complete responsibility
for the starter and associated chiller/ starter interconnecting wiring.
4 System Design Time Cost Savings
System design time is reduced, since
all starter components and interconnecting
wiring are pre- engineered and selected.
5 Complete package available with Agency
Approval
- Application
The Trane unit mounted starter can be applied on low voltage (under 600 volts)
applications up to approximately 900 tons capacity. To
determine the unit mounted starter to be used with a
particular selection, it is necessary to know the current draw of the compressor
motor. The starter current draw must be greater than,
or equal to, the compressor motor current draw.
- Reliability
The unit mounted starter is a star-delta closed transition electromechanical starter. Motor starters of this configuration
have proven reliability in thousands of centrifugal
chiller applications around the world. The proven electromechanical concept plus the use of industrial quality components makes
the CenTraVac unit mounted starter dependable in all
kinds of service applications.
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