Flooded Type Water Cooled Screw Chiller Technical M
anual
54
Press “unloading & shutdown” flow to enter into standby state after entering into ultralow outlet
water temperature protection.
Conditions for exiting ultralow outlet water temperature protection:
Water return temperature is no less than [set water return temperature of refrigeration water] plus 2;
manually reset.
Ultrahigh Discharge Temperature Protection
Prerequisites for ultrahigh discharge temperature protection:
①
Compressor works;
②
Discharge temperature T
discharge
is higher than
[ultrahigh discharge temperature]
(second-class password).
Conditions for exiting ultrahigh discharge temperature protection:
Lock it after manually reset three times and accumulated protection three times within 48 hours
(discharge temperature “T
discharge
“ is no more than
[ultrahigh discharge temperature] minus
25
℃
);
Temperature Sensor Failure Protection
Prerequisites for temperature sensor failure protection:
①
Sensor is under open circuit or short circuit;
Conditions for exiting sensor failure protection:
Manually reset; setting of corresponding temperature sensor is restored;
Pressure Sensor Failure Protection
Prerequisites for failure protection of pressure sensor:
①
Pressure sensor is under open circuit or short circuit and time is delayed for 3s;
Conditions for exiting high pressure sensor:
Manually reset and failure is eliminated.
Oil Pressure Difference Protection (high pressure – oil pressure)
Prerequisites for oil pressure difference protection:
①
Compressor works (shield in case of shutdown);
②
Oil pressure difference is higher than [0.2mpa], and time delay protection
[time delay of oil
pressure difference protection] reaches 40S;
Conditions for exiting oil pressure difference protection: