Eight common faults of refrigeration unit in cold storage

The refrigeration unit of cold storage is mainly composed of refrigeration compressor, condenser, cooling fan and solenoid valve, plus oil separator, liquid storage barrel, oil sight glass, diaphragm hand valve return filter and other components. Below, I have summarized and sorted out eight common faults of the refrigeration unit, which is convenient for you to repair better and maintain the good operation of the refrigeration unit.

1. The exhaust temperature of the refrigeration unit is high, the coolant level of the refrigeration unit is too low, the oil cooler is dirty, the oil filter core is blocked, the temperature control valve is faulty, the oil cut-off solenoid valve is not powered on or the coil is damaged, the diaphragm of the oil cut-off solenoid valve is broken or aging, the fan motor is faulty, the cooling fan is damaged, the exhaust duct is not unblocked or the exhaust resistance is large, and the ambient temperature exceeds the specified range, Temperature sensor failure, pressure gauge failure.

2. The pressure of the refrigeration unit is low, the actual air consumption is greater than the output air volume of the refrigeration unit, vent valve failure, inlet valve failure, hydraulic cylinder failure, load solenoid valve failure, minimum pressure valve stuck, user pipe network leakage, pressure setting is too low, force sensor failure, pressure gauge failure, pressure switch failure, pressure sensor or pressure gauge input hose leakage.

3. The oil consumption of refrigeration unit is large or the oil content of compressed air is large, and the cooling dose is too much. The correct position should be observed when the refrigeration unit is loaded. At this time, the oil level should not be higher than half, and the oil return pipe is blocked; The installation of the oil return pipe does not meet the requirements, the exhaust pressure of the refrigeration unit is too low during operation, the oil separation core is broken, the diaphragm inside the separation cylinder is damaged, the refrigeration unit has oil leakage, the coolant is deteriorated or out of service.

4. The exhaust pressure of the refrigeration unit is too high, the intake valve fails, the hydraulic cylinder fails, the load solenoid valve fails, the pressure setting is too high, the pressure sensor fails, the pressure gauge fails, and the pressure switch fails.

6. The refrigeration unit cannot be started, the fuse is broken, the temperature switch is broken, the wiring is loosened, the thermal relay of the main motor acts, the thermal relay of the fan motor acts, the transformer is broken, there is no power input, the fault is not eliminated, and the controller is faulty.

7. Fan motor overload, fan deformation, fan motor failure, fan motor thermal relay failure, loose wiring, cooler blockage, large exhaust resistance.

8. When the refrigeration unit is started, the current is large or trips, the user's air switch problem, the input voltage is too low, hydraulic cylinder fault, inlet valve fault, loose wiring, host fault, main motor fault, 1TR time relay is broken.