Catalogue

56 RLC-PRC042D-EN
Mechanical Specifications
The Tracer ™UC800 unit control module, utilizing Adaptive Control™ microprocessor,
automatically takes action to avoid unit shut-down due to abnormal operating conditions
associated with low refrigerant pressure, high condensing pressure, AFD/Compressor current
overload, low oil return or low AFD cooling, low discharge superheat, and high compressor
discharge temperature. Should the abnormal operating condition continue until a protective limit
is violated, the unit will be shut down. Unit protective functions of the UC800, include loss of chilled
water flow, evaporator freezing, loss of refrigerant, low refrigerant pressure, high refrigerant
pressure, high compressor motor temperature, and loss of oil to the compressor.
A full color Tracer AdaptiView™ TD7 touch screen display indicates all important unit and circuit
parameters, in logical groupings on various screens. The parameters including chilled water set
point, leaving chilled water temperature, demand limit set point, evaporator and condenser
refrigerant temperatures and pressures, compressor and fan speeds, and all pertinent electrical
information. The display also provides “on screen” trending graphs of predefined parameters as
well as customizable trend graphs based on user defined parameters from a list of all available
parameters. The display also provides indication of the chiller and circuits’ top level operating
modes with detailed sub-mode reports available with a single key press, as well as diagnostics
annunciation and date and time stamped diagnostic history. The color display is fully outdoor
rated, and, can be viewed in full daylight without opening any control panel doors.
Standard power connections include main three phase power to the compressors, condenser fans
and control power transformer and optional connections are available for the 115 volt/60 Hz single
phase power for the thermostatically controlled evaporator heaters for freeze protection.
Adaptive Frequency Drive
All RTAE chillers utilize Trane’s Adaptive Frequency™ Drive, 3
rd
Generation (AFD
3
) technology for
controlling the compressors. AFD
3
is a family of new generation adaptive frequency drives
specifically designed for Trane water chillers. AFD
3
incorporates the Trane communication protocol
enabling seamless integration with the unit controller. AFD
3
data such as drive status,
temperatures, modes and diagnostic information are accessible to the unit controller and through
the Tracer TU service tool.
AFD
3
contains technology that enables the drive to last the life time of the chiller and with less down
time. The technology enables operation on various power systems including alternative energy
sources. AFD
3
will protect itself and the compressor motor from over current, low or high line
voltage, phase loss, incoming phase imbalance, and over temperature due to loss of drive cooling
or loss of panel ventilation.
AFD
3
incorporates improved serviceability and troubleshooting tools to identify the issue quickly
and get the chiller back up and running. All AFD
3
control circuits are powered with class 2 low
voltage —separate from main power allowing service on the controls with the panel door open.
Additionally, the main electronic control modules can be serviced with the standard Trane screw
driver. The AFD
3
further incorporates another Trane service tool to allow for firmware upgrades
through Tracer TU.
Chilled Water Reset
This provides the control logic and factory installed sensors to reset leaving chilled water
temperature. The set point can be reset based on ambient temperature or return evaporator water
temperature.
Factory Mounted Flow Proving and Flow Control
The factory installed evaporator water flow switch is provided with the control logic and relays to
turn the chilled water flow on and off as the chiller requires for operation and protection. This
function is a requirement on the Stealth™ chiller.