screw water chiller is a mechanical device that can control the water temperature to +35℃~-110℃. It is named after its use of screw compressor . This article mainly introduces the common fault problems of this device.
screw chiller
1, high-voltage fault
screw chiller compressor exhaust pressure is too high, causing the high-voltage protection relay to operate. The compressor exhaust pressure reflects the condensation pressure, the normal value should be 1.40~1.60MPa, and the protection value should be set to 2.00MPa. If the pressure is too high for a long time, it will cause the compressor running current to be too high, the motor will be burned, and it will easily cause damage to the valve plate of the compressor exhaust port of the screw chiller compressor. What should be done is naturally to control the compressor exhaust pressure within the safe range!
2. Low voltage fault
The suction pressure of the screw chiller compressor is too low, causing the low voltage protection relay to operate. The compressor suction pressure reflects the evaporation pressure, the normal value should be between 0.40 and 0.60MPa, and the protection value should be set to 0.20MPa. If the suction pressure is low, the return air volume will be small and the cooling capacity will be insufficient, resulting in waste of electricity. The compressor motor with return air cooling is poorly dissipated and the motor is easily damaged! The solution is the same as a high-pressure fault, and try to keep the compressor within the normal pressure range.
chiller manufacturer
3. Low valve temperature failure
expansion valve outlet temperature reflects the evaporation temperature and is a factor affecting heat exchange. Generally, it has a temperature difference of 5.0~6.0℃ from the outlet water of refrigerant water. When a low valve temperature failure occurs, the compressor stops. When the valve temperature rises, it will automatically resume operation, and the protection value is -2.0℃.
4. Compressor overheating fault
screw chiller compressor motor winding embedded with thermistor , and the resistance value is generally 1kΩ. When the winding is overheated, the resistance value will increase rapidly. When it exceeds 141kΩ, the thermal protection module SSM operates, cut off the unit to run, and an overheating fault is displayed, and the TH fault indicator light is on.
5. Communication failure The control of each module by the
screw chiller computer controller is achieved through the communication line and the main interface board. The main reason for communication failure is poor contact or circuit breaker of the communication line, especially the interface is damp and oxidized, causing poor contact. In addition, the unit electronic board or main interface board is faulty, the address dial switch is improperly selected, and the power failure can cause communication failure.
Screw chiller
The above five fault phenomena are the most common, and understanding these fault phenomena and judgment capabilities and solutions have an irreplaceable effect on extending the service life of screw chiller!
