What is the reason for the overcurrent of the chiller compressor?

Many brands of chiller refrigeration compressors will have overcurrent protection in the machine's own protection function. Whether it is from the external power supply or the operation of the chiller refrigeration compressor itself, the excessive current of the chiller is more frequent. What happens, if there is no overcurrent protection, the destruction rate of the chiller refrigeration compressor will increase by a large value. The following editor will take you to summarize the reasons for the overcurrent protection of the chiller refrigeration compressor.

In short, there are three reasons for the overcurrent of the chiller compressor:

1. Too much refrigerant in the chiller refrigeration system;

2. The condensing pressure of the chiller refrigeration system is too high;

3. The chiller compressor lacks refrigeration oil.

Let's explain in detail:

1. The cooling effect of the chiller compressor is not good

The chiller system has too little fluorine, the temperature of the chiller compressor is very high when working, and the high-temperature coil is cooled by the inhaled refrigerant. If the chiller system has too little fluorine, the system flow is small, which cannot meet the 100% performance of the chiller evaporator. Load, resulting in an increase in suction superheat, coupled with the small suction flow of the compressor, the cooling efficiency is greatly reduced, so long-term operation can lead to thermal protection of the compressor.

2. Malfunction of chiller refrigeration system

Air is mixed in the refrigeration system of the chiller: if there is air in the system, the air often accumulates in the upper part of the condenser, because it cannot pass through the liquid accumulator of the condenser. Whether there is air in the system can generally be determined by the beating of the system pressure. , if there is air in the system, it should be re-evacuated and treated with fluoride. Excessive fluorine: The compressor is overloaded for a long time, which will eventually cause the compressor to trip due to overcurrent. In this case, some fluorine should be released.

3. Poor heat dissipation of the external chiller

Short circuit of the return and exhaust air of the outdoor unit: If the outdoor unit is installed in a closed balcony, in a narrow aisle, or in a place with no ventilation, such as in the house, there are obstacles in front of the air outlet. The air volume of the outdoor unit is small and the heat dissipation speed is slow: if the condenser of the outdoor unit is too dirty or blocked by dust and oil, the speed of the fan motor is slow, the fan capacitance becomes smaller, and the ambient temperature of the outdoor unit is high.

4. the external power supply voltage factors of the chiller

The power supply voltage is low or high, both of which will cause the compressor working current to be high, and the domestic voltage is low in the vast majority, especially when the power consumption peaks. If the power supply voltage (that is, the voltage before starting up) is too low: the user should be asked to re-wire. If the voltage is around 190V, a voltage stabilizer can be installed. Check the voltage drop after booting: under normal circumstances, the voltage drop is only a dozen volts. If the voltage drop is too large, the power cord should be thickened or rewired, and faults such as poor line contact should be eliminated.

5. The chiller shell/internal temperature is high

Poor lubrication of the compressor: The height difference between the indoor and outdoor units is greater than 5 meters without an oil return bend, or only an oil return bend is made on one pipe, the system cannot return oil smoothly, and the compressor temperature slowly during operation due to lack of lubrication rise, eventually leading to overheating tripping.

Impurities and too much water in the chiller system: the lubricating oil is deteriorated and carbonized, which cannot play a normal effect, resulting in a sharp rise in the temperature of the chiller compressor and overheating. This situation generally occurs on machines that have been repaired or machines that have been used for a long time. If the material in the chiller system is black, it must exist. At this time, use nitrogen to clean the system, replace the compressor, and capillary components. Re-evacuated and added fluoride.

It is caused by both external and internal factors. The external factors are easy to solve, such as voltage, wiring faults, condenser cooling conditions, starting capacitors, and pipes. The internal causes are compressor damage, dirty pipelines, poor refrigerant composition, and high unsaturated gas levels, which can be easily analyzed and dealt with.