Vacuum pumping is an essential process before filling refrigerant in the process of production or maintenance of refrigeration equipment. That is, the vacuum pump is connected with the refrigeration system pipeline to remove the non condensable gas and water in the system pipeline.
Hazards of not vacuuming:
Blocking the pipeline: if the water content of the system exceeds a certain limit, an ice block will be formed at the capillary outlet, so that the refrigerant can not circulate normally.
Corrosion: water reacts with refrigerant, hydrochloric acid and fluorine acid will damage the insulation layer of compressor.
Copper plating and rusting: the oxygen in the residual air reacts with hydrochloric acid and copper to produce copper plating, which corrodes the copper and iron parts in the system pipes and shortens the service life of system parts.
Decomposition of refrigerant: oxide produced by corrosion will accelerate the decomposition of refrigerant.
Deterioration and aging of lubricating oil: the oxygen in the residual air will oxidize the frozen lubricating oil to decompose and deteriorate the lubricating oil.
Method and process of vacuumizing:
1. Before operation, check that the vacuum pump is placed horizontally, the sealing gasket is not damaged, and the pressure gauge of the vacuum gauge is set to zero.
2. Place the vacuum pump on the indoor ground (safe, stable and convenient for operation).
3. The fluorine adding tube, vacuum meter and vacuum pump are combined.
4. Unscrew the nut at the fluorine adding port from the valve, screw the fluorine adding pipe onto the fluorine adding port, and confirm whether the thimble is in place.
5. First open the vacuum meter, then turn on the power switch of the vacuum pump, and start vacuumizing. The vacuum degree of normal system shall be below - 756mmhg. The vacuumizing time shall be determined according to the size of refrigeration system and vacuum pump.
6. After the evacuation operation, quickly remove the fluorine adding pipe and vacuum gauge, and then fully open the valve again.
After opening the refrigeration system valve, pay attention to whether the pressure of the vacuum gauge rises. If there is a rise, it means that there is a leak in the refrigeration system. If there is a leak, find out the cause and solve it. Then repeat the above vacuum pumping process.
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