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51RLC-PRC006-EN
Human Interfaces
The Trane air-cooled Model RTAC chiller
offers two easy-to-use operator interface
panels, the EasyView and the DynaView.
EasyView is a coded display that allows
the user to access the current leaving
water temperature, its setpoint, and any
recent diagnostics.
DynaView is an LCD touchscreen display
that is navigated by file tabs. This is an
advanced interface that allows the user
to access any important information
concerning setpoints, active
temperatures, modes, electrical data,
pressures, and diagnostics.
Safety Controls
A centralized microcomputer offers a
higher level of machine protection. Since
the safety controls are smarter, they limit
compressor operation to avoid
compressor or evaporator failures,
thereby minimizing nuisance shutdown.
Tracer
™
Chiller Controls directly senses
the control variables that govern the
operation of the chiller: motor current
draw, evaporator pressure and
condenser pressure. When any one of
these variables approaches a limit
condition where damage may occur to
the unit or shutdown on a safety, Tracer
Chiller Controls takes corrective action to
avoid shutdown and keep the chiller
operating. This happens through
combined actions of compressor slide
valve modulation, electronic expansion
valve modulation and fan staging. Tracer
Chiller Controls optimizes total chiller
power consumption during normal
operating conditions. During abnormal
operating conditions, the
microprocessor will continue to optimize
chiller performance by taking the
corrective action necessary to avoid
shutdown. This keeps cooling capacity
available until the problem can be
solved. Whenever possible, the chiller is
allowed to perform its function; making
Controls
chilled water. In addition, microcomputer
controls allow for more types of
protection such as over and under
voltage. Overall, the safety controls help
keep the building or process running and
out of trouble.
Standalone Controls
Interface to standalone units is very
simple; only a remote auto/stop for
scheduling is required for unit operation.
Signals from the chilled water pump
contactor auxiliary or a flow switch are
wired to the chilled waterflow interlock.
Signals from a time clock or some other
remote device are wired to the external
auto/stop input.
Standalone Controls
Standard Features
• External Auto/Stop — A jobsite
provided contact closure will turn the
unit on and off.
• Chilled Waterflow Interlock — A jobsite
provided contact closure from a chilled
water pump contactor or a flow switch
is required and will allow unit operation
if a load exists. This feature will allow
the unit to run in conjunction with the
pump system.
• External Interlock — A jobsite supplied
contact opening wired to this input will
turn the unit off and require a manual
reset of the unit microcomputer. This
closure is typically triggered by a
jobsite supplied system such as a fire
alarm.
• Chilled Water Pump Control — Unit
controls provide an output to control
the chilled water pump(s). One contact
closure to the chiller is all that is
required to initiate the chilled water
system. Chilled water pump control by
the chiller is a requirement on the Air-
Cooled Series R.
• Chilled Water Temperature Reset —
Reset can be based on return water
temperature or outdoor air
temperature.
Figure C1 — DynaView Operator Interface
Figure C2 — EasyView Operator Interface