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Microprocessor controls
Microprocessor controls provide the safety, interlock, ca-
pacity control, indications and accessibility necessary to
operate the chiller in a safe and efficient manner.
Control system
The microprocessor control on each Carrier chiller is
factory-mounted, factory-wired, and factory-tested to
ensure machine protection and efficient capacity control.
In addition, the program logic ensures proper starting,
stopping, and recycling of the chiller and provides a com-
munication link to the Carrier Comfort Network® (CCN)
system.
Features
Control system
• Component test and diagnostic check
• Programmable recycle allows chiller to recycle at opti-
mum loads for decreased operating costs
• Menu-driven keypad interface for status display, set
point control, and system configuration
• CCN system compatible
• Primary and secondary status messages
• Individual start/stop schedules for local and CCN opera-
tion modes
• Recall of up to 25 alarm messages and 25 alert mes-
sages with diagnostic help
• Two chiller lead/lag with third chiller standby is stan-
dard in the PIC III software
• Optional soft stop unloading decreases compressor
speed to unload the motor to the configured amperage
level prior to stopping
• Languages pre-programmed at factory for English, Chi-
nese, Japanese, Korean
• ILT (International Language Translator) available for
conversion of extended ASCII characters
Safety cutouts
• Motor high temperature*†
• Refrigerant (condenser) high pressure*†
• Refrigerant (cooler) low temperature*†
• Lube oil low pressure*
• Compressor (refrigerant) high discharge temperature*
• Under voltage**
• Over voltage**
• Cooler and condenser liquid flow
• Motor overload†
• Motor acceleration time
• Intermittent power loss**
• Motor stall protection
• Low level ground fault
• Cooler and condenser freeze prevention*
• Low oil temperature
• Line voltage imbalance**
• Line current imbalance**
• Line frequency
• Motor current imbalance
• Motor rotation reversal
• Excessive motor amps
• Motor starts limit
• VFD speed out of range
• High VFD rectifier temperature*†
• High VFD inverter temperature*†
• DC bus voltage (Low/High)
Capacity control
• Leaving chilled liquid control
• Entering chilled liquid control
• Soft loading control by temperature or load ramping
• Hot gas bypass valve (optional)
• Power (demand) limiter
• Automatic chilled liquid reset (3 methods)
• Manual speed control
Interlocks
• Manual/automatic remote start
• Starting/stopping sequence
Pre-lube/post-lube
Pre-flow/post-flow
• Compressor run interlock
• Pre-start check of safeties and alerts
• Low chilled liquid (load) recycle
• Monitor/number compressor starts and run hours
• Manual reset of safeties
Indications
• Chiller operating status message
•Power-on
• Pre-start diagnostic check
• Compressor motor amps
• Alert (pre-alarm)††
• Alarm
• Contact for remote alarm
• Safety shutdown messages
• Elapsed time (hours of operation)
• Chiller input kW
• Demand kW
Drive control parameters
• Compressor 100% speed (Hz)
• Rated line voltage
• Rated line amps
• Rated line kW
• Motor rated Load kW
• Motor rated Load amps
• Motor nameplate amps
• Motor nameplate RPM
• Motor nameplate kW
• Inverter PWM frequency
*Can be configured by the user to provide alert indication
at user-defined limit.
†Override protection: Causes compressor to first unload
and then, if necessary, shut down.
**Will not require manual reset or cause an alarm if auto-
restart after power failure is enabled.
††By display code only.
Controls