Flooded type water cooled screw chiller (PCB Control)
105
If chilled water flow fails, chilled water pump stops after 30s delay; cooling water pump and cooling
tower stops after 60s delay.
If cooling water flow fails, cooling water pump and cooling tower stops after 60s delay; chilled water
pump stops after 600s delay.
Note: fault can be cleared after power re-energized and it needs to be confirmed manually, then
when both temperature and time condition gets satisfied, the chiller can restart.
Temperature sensor failure
Entering chilled water temperature sensor short circuit/open circuit, display entering chilled water
temperature fault and chiller stops according to abnormal shutdown program. After the sensor reset,
fault on screen must be cleared manually; when both temperature and time condition gets satisfied,
the chiller can restart.
Leaving chilled water temperature sensor short circuit/open circuit, display leaving chilled water
temperature fault and chiller stops according to abnormal shutdown program. After the sensor reset,
fault on screen must be cleared manually; when both temperature and time condition gets satisfied,
the chiller can restart.
Entering cooling water temperature sensor short circuit/open circuit, display entering cooling water
temperature fault and chiller stops according to abnormal shutdown program. After the sensor reset,
fault on screen must be cleared manually; when both temperature and time condition gets satisfied,
the chiller can restart.
Leaving cooling water temperature sensor short circuit/open circuit, display leaving cooling water
temperature fault and chiller stops according to abnormal shutdown program. After the sensor reset,
fault on screen must be cleared manually; when both temperature and time condition gets satisfied,
the chiller can restart.
Discharge temperature sensor short circuit/open circuit, display discharge temperature fault and
chiller stops according to abnormal shutdown program. After the sensor reset, fault on screen must
be cleared manually; when both temperature and time condition gets satisfied, the chiller can
restart.
Oil temperature sensor short circuit/open circuit, display oil temperature fault and chiller stops
according to abnormal shutdown program. After the sensor reset, fault on screen must be cleared
manually; when both temperature and time condition gets satisfied, the chiller can restart.
Over/under voltage
When power supply voltage is less than 90% or more than 110%, corresponding alarm over voltage
or under voltage occurs. The chiller will stop immediately according to abnormal shutdown program.
Fault on screen must be cleared manually; when both temperature and time condition gets satisfied,
the chiller can restart.
High/low pressure protection
Alarm as soon as high pressure switch trips and stop the chiller immediately according to abnormal
shutdown program. It is one kind of NC switch and needs manual reset of the red reset button when
