Unit Description - Trane RTAA-70 Installation & Maintenance Manual

General Information

Unit Description

The 70 through 125-ton Model RTAA units are helical-rotary type, air-cooled
liquid chillers designed for installation outdoors. The unit has two
compressors and the compressor circuits are completely assembled,
hermetic packages. They are factory-piped, wired, leak-tested, de-hydrated,
and tested for proper operation before shipment. The units are factory
charged with refrigerant and oil.
The RTAA series features Trane's exclusive Adaptive Control™ logic with
Clear Language Display. It monitors the control variables that govern the
operation of the chiller unit. Adaptive Control logic can adjust these variables,
when necessary, to optimize operational efficiencies, avoid chiller shutdown,
and keep producing chilled water. An optional remote display is available to
monitor unit operation from a remote location.
These dual-compressor units feature two independent circuits, one for each
compressor. Compressor unloaders are solenoid actuated. Each refrigerant
circuit is provided with filter drier, sight glass, electronic expansion valve, and
charging valves.
The shell-and-tube type evaporator is manufactured in accordance with ASME
standards. The evaporator is fully insulated and is equipped with water drain
and vent connections. Packaged units have heat tape protection to
-20 F .
NOTE: Packaged units are factory charged with refrigerant and oil. Remote
evaporator units are shipped with a holding charge of nitrogen and a partial
charge of oil.
RTAA-SVX01A-EN 7