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.
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.
