Common reasons for high exhaust temperature of compressors

During the operation of the air conditioning system, it is common for the compressor exhaust temperature to be too high. This issue may trigger a series of chain reactions, interfere with the normal operation of air conditioning, and even cause equipment damage. The 10 common causes of high compressor exhaust temperature are as follows.

1. It is necessary to check whether there are leaks in the connection pipeline interfaces and other components of the air conditioning refrigeration system. Leakage may lead to insufficient refrigerant, resulting in a decrease in compressor return air volume, an increase in exhaust temperature, and triggering the overheat protection mechanism. It is necessary to carefully search for the leakage points of the refrigeration system.

2. Check for refrigerant leaks or intake issues in the refrigeration system. It is necessary to conduct a comprehensive inspection of the compressor, indoor unit evaporator, connecting pipelines, and outdoor mechanism cooling system piping, and perform necessary nitrogen blowing and replacement of subcooling piping or compressor components. Finally, use a vacuum pump to evacuate and quantitatively fill the refrigerant to ensure the normal operation of the system.

3. If the connecting pipeline is severely bent or dented, it will hinder the flow of refrigerant, affect the refrigeration effect, and cause the compressor exhaust temperature to rise. The appearance of the connecting pipeline should be carefully inspected to see if there is any obvious deformation or damage. For extended pipelines, it is necessary to check whether their connections are tight and whether there are leaks at the welding points. If any problems are found, they should be repaired or replaced in a timely manner

Check if the valve needle of the electronic expansion valve is in an unopened state, which may cause poor compressor return air and inability to cool the compressor properly, leading to overheating protection failure. It is necessary to separately determine whether there is a malfunction in the electronic expansion valve or the outdoor unit computer board control, and replace them accordingly.

5. The heat dissipation effect of outdoor units is closely related to the outdoor air circulation conditions. Therefore, outdoor units should be installed in well ventilated locations. If the outdoor unit is not positioned properly, it can lead to poor heat dissipation. In addition, the accumulation of dust on the surface of the condenser fins can also cause an increase in exhaust temperature.

External unit compressor sensor detachment, open circuit, short circuit, or outdoor unit computer board exhaust sensor circuit resistance virtual soldering, open soldering, filter capacitor failure and other faults may all cause the compressor exhaust temperature to be too high.

As the core component of the air conditioning system, if the compressor malfunctions, such as shaft jamming or winding short circuit, it will cause the compressor to malfunction and the exhaust temperature to rise. Compressor shaft jamming may be caused by poor lubrication or foreign objects entering, leading to difficulties in compressor operation and generating a large amount of heat

Shanghai KUB Refrigeration Equipment Co., Ltd.

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