Trane R Series - Operating Principles; RTWA Units; RTUA Units; RTCA Units

RLC-SVX07A-EN 83
Operating Principles
RTWA Units
This section describes the mechanical operating principles of Series R water-
cooled chillers equipped with microcomputer-based control systems.
The 70-125-ton Model RTWA units are dual compressor, helical-rotary type
water-cooled liquid chillers. The basic components of an RTWA unit are:
• Clear Language Display and control modules
• Helical-rotary compressor
• Direct expansion evaporator
• Water-cooled condensers
• Oil supply system (hydraulic and lubrication) - Interconnecting piping
Components of a typical RTWA unit are identified in Figures 35.
RTUA Units
The 70-125 ton RTUA units are dual compressor, helical-rotary type
compressor chillers. The basic components of an RTUA unit are:
• Clear Language Display and control modules
• Helical rotary compressors
• Direct expansion evaporator
• Oil cooler
• Interconnecting piping between the compressors and evaporator
Components of a typical RTUA are identified in Figures 36.
RTCA Units
The 70-125 ton RTCA units are air-cooled condensing units. The basic compo-
nents of an RTCA unit are:
• Terminal box
• Air-cooled condenser
• One (1) fan inverter per circuit - Optional
Components of a typical RTCA are identified in Figures 36.