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    Method and procedure of replacing refrigeration compressor

    1. Cut off the power supply: before replacing the compressor, be sure to cut off the power supply of the unit, otherwise there will be a risk of electric shock. When removing the power supply of the compressor, the identification of each wire and the corresponding terminal should be done to facilitate the restoration of the wiring after maintenance. 2. Refrigerant release: Use the inner hexagon to open the high and low pressure side valves, pay attention to the ventilation of the operating environment, so as not to suffocate the operator; the speed of the refrigerant release should not be too fast, so as to avoid the operator being injured by the refrigerant. If conditions permit, the refrigerant should be recovered rather than directly discharged to protect the environment. 3. Remove the suction and exhaust pipes: Before removing the suction and exhaust pipes, ensure that the refrigerant in the system has been discharged. 4. Replace the compressor and connect the suction and exhaust pipes: replace with a new compressor. During the process of the compressor, the tilt angle of the compressor must not be greater than 45 °. The rubber plug of the compressor must be exhausted first and then the suction tube. The interval between the rubber plug and the welded piping should not exceed 10 minutes to prevent air moisture and impurities from entering the system and affecting the performance of the unit. 5. Pressure-holding and leak-checking: After suction and exhaust pipes are welded, pressure-holding and leak-checking are required. The gas used for holding pressure can only be inert gases such as nitrogen and carbon dioxide. It is strictly forbidden to substitute air, oxygen, acetylene, refrigerant, etc. to avoid safety accidents. Before pressing, the pressure test instrument should be connected to the pressure test leak detection pipeline of the system, and the compressed gas cylinder should be connected according to the safety requirements. The R22 system is about 2.6MPa and the R410a system is about 3.8MPa. After 24 hours of placement, the pressure drop is within 0.02MPa. qualified. 6. Vacuuming: Before any system needs to be filled with refrigerant after the installation, pressure maintenance and leak detection, the system must be vacuumed to exhaust the air and moisture in the system. It is strictly forbidden to use refrigerant to purge the pipeline to evacuate. This method is difficult to completely remove the air and moisture in the system, especially when the system pipeline is long. 1. Before evacuating, the gas used for holding pressure in the system should be discharged cleanly, and the gauge pressure shall be reduced to 0MPa. 2. After the vacuum reaches -0.1MPa (gauge pressure -1kgf / cm2), close the high and low pressure shut-off valves and stop the vacuum pump. If the vacuum cannot be maintained, it indicates that there is a leak in the system. It is necessary to re-check the system for leaks and repair the leaks to pass. 7. Refrigerant filling: The filling volume of the unit should be calculated through strict calculation according to the requirements of the nameplate and the length of the connecting pipes of the internal and external machines. When infusion, an electronic scale must be used to accurately measure the amount of refrigerant infusion. Refrigerant is filled into the liquid tube side in liquid form, and observe the electronic scale until the required filling volume. If the system is not turned on and cannot be added to the system, let the system run at the full load of refrigeration, and the refrigerant is charged into the trachea side in gaseous form, and observe the electronic scale until the required perfusion amount is reached. 8. Trial operation: restore electrical components such as compressor electric heating belt and temperature sensor to their original positions. Restore power and ensure the unit is well grounded. And jog the compressor to see if it reverses. Start the trial operation, listen to the compressor and fan for abnormal noise, whether the operation of each mode is normal, and whether the unit current is within a reasonable range.

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    Method and procedure of replacing refrigeration compressor

    06/14/2020

    Method and procedure of replacing refrigeration compressor

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    How to judge the quality of single-phase and three-phase refrigeration compressors

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