Flooded type water cooled screw chiller (PCB Control)
109
10
High Discharge
Temperature Protection
The compressor discharge
temperature is greater than
the setting value
The compressor which exists
protection stop running
immediately; Other compressors
continue running
The protection is relieved once
the discharge temperature is
lower than the setting value
and reset manually on the
touch screen
1,The superheat too high( the refrigerant not
enough, EXV failure)
2,The discharge pressure too high
3,The oil level too low and the oil volume in the
system too small
4,Running in bad condition, too high
compression ratio , no auxiliary cooling
5,Bearting or screws are damage
6,Poor system matching
11
Low Chilled Leaving
Water Temperature
Protection
The chilled water
temperature is lower than the
setting value
The compressor stop running
immediately
No display. Reset
automatically when the water
temperature is greater than the
setting value
1,The chilled water flow not enough
2,The unit continue running in under load
condition
12
High Cooling Entering
Water Temperature
Protection
The cooling water
temperature is greater than
the setting value
The compressor stop running
immediately
No display. Reset
automatically when the water
temperature is greater than the
setting value
1,The cooling tower can not work normally
2,The cooling water flow not enough
13
Chilled Entering Water
Temperature Sensor
Failure
Chilled entering water
temperature sensor is
abnormal (open circuit or
short circuit)
The compressor stop running
immediately
Reset manually on the touch
screen
1.The temperature sensor failure
2.The wiring connection is not correct
3.The wiring line is abnormal, has been
damaged
14
Cooling Leaving Water
Temperature Sensor
Failure
Cooling leaving water
temperature sensor is
abnormal (open circuit or
short circuit)
The compressor stop running
immediately
Reset manually on the touch
screen
1.The temperature sensor failure
2.The wiring connection is not correct
3.The wiring line is abnormal, has been
damaged
15
Cooling Entering Water
Temperature Sensor
Failure
Cooling entering water
temperature sensor is
abnormal (open circuit or
short circuit)
The compressor stop running
immediately
Reset manually on the touch
screen
1.The temperature sensor failure
2.The wiring connection is not correct
3.The wiring line is abnormal, has been
damaged
16
Chilled Leaving Water
Temperature Sensor
Failure
Chilled leaving water
temperature sensor is
abnormal (open circuit or
short circuit)
The compressor stop running
immediately
Reset manually on the touch
screen
1.The temperature sensor failure
2.The wiring connection is not correct
3.The wiring line is abnormal, has been
damaged
