Flooded type water cooled screw chiller (PCB Control)
108
7
High-pressure
Protection
High pressure switch OFF
The compressor which exists
protection stop running
immediately; Other compressors
continue running
Press red reset button, reset
manually on the touch screen
1,The cooling water quality is too bad and the
heat exchange of condenser is abnormal
2,There is too much non-condensable gas in the
system
3,The cooling water flow too small or the
temperature too high
4,Too much refrigerant
5,Wrong refrigerant type
6,The discharge shutoff valve does not open fully
8
Low-pressure
Protection
The low pressure switch
continue disconnecting more
than 3s (setting is allowed)
1.The compressor which exists
protection stop running
immediately; Other compressors
continue running
2.If the protection occurs before
the unit starts to work, all of the
compressors in the unit cannot
run.
Reset manually on the touch
screen
1,The refrigerant not enough
2,EXV failure, cannot work abnormally
3,The delay time of low pressure switch alarm
too short
4,There is plugging in the filter
5,Some water enter the refrigerant system in
evaporator
6,Poor system matching(the evaporator too
small or the compressor too large)
7,There is too much oil in the system
8,Chilled water flow too small or the temperature
too low
9
Low Oil Level
Protection
The oil level switch continue
disconnecting more than 60s
(setting is allowed)
The compressor which exists
protection stop running
immediately; Other compressors
continue running
Reset manually on the touch
screen
1,Too low oil temperature when starting lead to
too low pressure difference and return oil is
abnormal
2,Return oil solenoid valve failure or plugging in
the filter
3,Mix different oil types and return oil system is
abnormal
4,Oil level switch failure or wrong wiring
connection
5. The oil volume not enough
