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Operating Principles Mechanical
This section contains an overview of the operation and maintenance of Series R chillers equipped
with microcomputer-based control systems. It describes the overall operating principles of the
AdaptiR™ with AFD option water chiller.
Following the section is information regarding specific operating instructions, detailed descrip-
tions of the unit controls and options (Operator Interface - Control Systems), and maintenance
procedures that must be performed regularly to keep the unit in top condition (Periodic Mainte-
nance and Maintenance Procedures). Diagnostic information (Diagnostics) is provided to allow
the operator to identify system malfunctions.
Note: To ensure proper diagnosis and repair, contact a qualified service organization if a prob-
General
The Model AdaptiR™ with AFD option units are single-compressor variable frequency wa-
ter-cooled liquid chillers. These units are equipped with unit-mounted starter/control panels.
The basic components of an AdaptiR™ with AFD option unit are:
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Refrigeration (Cooling) Cycle
The refrigeration cycle of the Series R chiller is conceptually similar to that of other Trane chiller
products. It makes use of a shell-and-tube evaporator design with refrigerant evaporating on the
shell side and water flowing inside tubes having enhanced surfaces.
The compressor is a twin-rotor helical rotary type. It uses a suction gascooled motor that oper-
ates at lower motor temperatures under continuous full and part load operating conditions. An
oil management system provides an almost oil-free refrigerant to the shells to maximize heat
transfer performance, while providing lubrication and rotor sealing to the compressor. The lubri-
cation system ensures long compressor life and contributes to quiet operation.
Condensing is accomplished in a shell-and-tube heat exchanger where refrigerant is condensed
on the shell side and water flows internally in the tubes.
Refrigerant is metered through the flow system using an electronic expansion valve, that maxi-
mizes chiller efficiency at part load.
A unit-mounted starter and control panel is provided on every chiller. Microprocessor- based unit
control modules (Symbio800) provide for accurate chilled water control as well as monitoring,
protection and adaptive limit functions. The "adaptive" nature of the controls intelligently pre-
vents the chiller from operating outside of its limits, or compensates for unusual operating condi-
tions, while keeping the chiller running rather than simply tripping due to a safety concern. When
problems do occur, diagnostic messages assist the operator in troubleshooting.
Cycle Description
The refrigeration cycle for the AdaptiR™ with AFD option chiller can be described using the pres-
sure- enthalpy diagram shown in
78
lem should occur.
Unit-mounted panel containing Symbio800 controller and Input/Output LLIDS and AFD
Helical-rotary compressor
Evaporator
Electronic expansion valve
Water-cooled condenser with integral subcooler
Oil supply system
Oil cooler (application dependent)
Related interconnecting piping
Passitive Filter (option)
Figure 32
Key State Points are indicated on the figure and are
RTHD-SVX04K-EN
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