Trane CGWF - Manual (Page 8)

CG-PRC012-EN 8
Controls
Human Interfaces
The Trane water-cooled 20-60 ton scroll
CGWF chiller offers an easy-to-use
operator interface panel, the DynaView.
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 main processor 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 (CH530) directly
senses the control variables that govern
the operation of the chiller: 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 compressor shedding. 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
chilled water. 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.
Standard Features
• External Auto/Stop — A jobsite
provided contact closure will turn the
unit on and off.
• Chilled Water Flow Interlock — A
jobsite provided contact closure from a
chilled water pump contactor and/or a
flow switch is required and will allow
unit operation if a load exists and flow
is proven. This feature will allow the
unit to run in conjunction with the
pump system.
Figure C1. DynaView operator interface
• Emergency Stop — 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 Temperature Reset —
Reset can be based on return water
temperature or outdoor air temperature
(optional).
• Condenser Water Pump Control — Unit
controls provide an output to control
the condenser water pump(s). One
contact closure to the chiller is all that is
required to initiate the chilled water
system.
• Condenser Water Flow Protection — A
jobsite supplied contact closure from a
flow switch or pressure switch is
required and will shut down the unit if
flow is lost.