Speaking of vacuuming, this is an indispensable process before the refrigerant is charged during the production, installation, and maintenance of central air conditioners. So, what is vacuum? Vacuum is a space condition where there is no substance. It is a physical phenomenon. The method of vacuuming is to connect the vacuum pump with the air-conditioning system pipes to exhaust the non-condensable gas and moisture in the air-conditioning system pipes.
Seeing the non-condensable gas mentioned above, you may be more confused about the definition of non-condensable gas. What everyone knows is that the air contains a large amount of oxygen, nitrogen, carbon dioxide and other gases. These gases cannot Dissolved in refrigerant, we generally call it non-condensable gas.
Vacuuming is an indispensable and important process before refrigerant charging in the production, installation and maintenance of air conditioners. The specific method is to use a vacuum pump to connect with the air-conditioning system pipeline to remove the non-condensable gas and moisture in the air-conditioning system pipeline.
We all know that the air contains a lot of nitrogen , oxygen , carbon dioxide and other gases. These gases cannot be dissolved in the refrigerant. We usually collectively call them non-condensable gases. In addition, the moisture in the air and the refrigerant are not mutually soluble. The presence of moisture and non-condensable gas affects the operation effect of the air conditioner, so the purpose of vacuuming is to exhaust the non-condensable gas and moisture in the air conditioner system. But vacuuming does not mean 100% extraction of all substances in the pipeline. Industrial vacuum can be divided into high vacuum, medium vacuum and low vacuum.
So why vacuum? Without vacuuming, there will definitely be moisture and non-condensable gas remaining in the system, which will bring great harm to the air conditioning system. Moisture is the biggest killer in air-conditioning and refrigeration systems. Moisture mixed into the refrigeration system will cause the following hazards:
First, the interaction of lubricating oil and moisture will generate acid, which has a corrosive effect on copper pipes, which will affect the service life of air-conditioning;
Secondly,After the copper is corroded, the copper ions are free in the refrigerant, and will be replaced by iron when passing through the compressor, causing "copper plating" phenomenon and damaging the compressor; again, moisture mixed in the refrigerant will cause the expansion valve port Or the capillary tube is frozen, causing the refrigerant to fail to circulate, and the air conditioner cannot work normally. This is the so-called "ice blocking" phenomenon.
The existence of non-condensable gas is very harmful to the system, which is mainly manifested in:
1. The compression ratio of non-condensable gas is very small. After being compressed, it will increase the condensing pressure and condensing temperature of the system at the same time.
2. When the compressor discharge temperature rises and the power consumption increases, the energy efficiency ratio of the air conditioner will decrease accordingly;
3. The oxygen in the air mixed into the system will oxidize the copper pipes and affect the indoor unit
4. At the same time, because the exhaust temperature is too high, the lubricating oil may be carbonized. When these carbides pass through the expansion valve valve port or capillary tube, it is easy to cause blockage, causing the refrigerant to fail to circulate and the air conditioner cannot work normally , This is the so-called "dirty blocking" phenomenon.
5. The carbonization of lubricating oil will affect the lubrication effect. Under the action of oxygen and high temperature, it may even cause the compressor to explode.
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