Flooded type water cooled screw chiller (PCB Control)
107
2.
Troubleshooting
No.
Alarm
Trouble Description
Action
Reset Type
Possible Cause
1
Power Failure
Protection
Phase sequence relay
switches OFF
Compressor cannot work; The
compressor stop running
immediately
Reset manually on the touch
screen
The power quality is poor, there may exist phase
inversion, lacking phase or phase imbalance.
2
Compressor Motor
Protection
Compressor motor module
switches OFF
Compressor cannot work; The
compressor stop running
immediately
Power off the unit and re-up
electricity, reset manually on
the touch screen
1.The power of motor is poor, there may exist
phase inversion, lacking phase, over-voltage,
under-voltage
2. The motor overheat
3
Compressor Overload
Protection
Excess current and cumulate
energy make the thermal
relay trip
The compressor stop running
immediately
Reset manually on the touch
screen
1,The compressor continue running in bad
condition, over-current
2,The setting value of thermal relay too low
4
Contactor Protection
The coil of contactor does
not suction normally
The compressor stop running
immediately
Reset manually on the touch
screen
1.The suction of the contactor is abnormal when
Y type switch to
△
type
2.The vibration during operation cause the
contact to loosen
5
Anti-freeze Protection
Anti-freeze switch OFF
The compressor stop running
immediately
Reset manually on the touch
screen
1,The chilled water flow fall sharply, the water
temperature too low
2,Anti-freeze switch is damaged or wiring
connection is abnormal
6
Water Flow Fault
The water flow switch
continue disconnecting
more than 5s
1.Compressor cannot work; The
compressor stop running
immediately
；
2. Chilled water flow failure: The
chilled water pump stop working
after 30s delay; Cooling water
pump and cooling tower shut
down after 120s delay
3.Cooling water flow failure: The
cooling water pump and cooling
tower shut down after 30s delay;
chilled water pump stop working
after 180s delay.
Power off the unit and re-up
electricity, reset manually on
the touch screen
1,The water pump failure, the water flow too
small
2,Water flow switch failure or wrong wiring
connection
