Flooded type water cooled screw chiller (PCB Control)
MCAC-CTSM-2012-11
58
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 can not run.
Reset manually on the touch screen
1,The refrigerant not enough
2,EXV failure, can not 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