Precautions for R404a refrigerant when replacing R22

It took more than ten days to introduce the characteristics of various refrigerants and their applications. I also mentioned the precautions when replacing various refrigerants. In this article, we take R404a refrigerant instead of R22 refrigerant as an example to give you a specific introduction!

In terms of the current market situation, R22 refrigerant still firmly occupies the top spot in the domestic refrigeration industry in terms of refrigerant usage, but because R22 refrigerant has a certain effect on the ozone layer Destructive effect and a relatively high greenhouse effect. Therefore, according to the relevant agreement, the R22 refrigerant will be eliminated before 2030. Therefore, under this premise, the refrigeration industry has been looking for alternatives to R22 refrigerant, and R404a is a typical one.

Of course, although the refrigeration performance of R404a refrigerant and R22 refrigerant are relatively close, there are still some differences in actual use, so there must be differences. Few considerations. Below we will give you a list of specific issues that need to be considered when R404a refrigerant replaces R22 refrigerant:

1. In the process of replacement, the first thing to consider is the issue of lubricants, in short It is necessary to use the matching PVE ester oil to replace the mineral lubricating oil for R22 refrigerant.

2. Because ester lubricants have relatively strong hydrophilicity and poor dehydration, it is necessary to avoid contact with air as much as possible during the process of changing lubricants. Be sure to use it as soon as possible after opening the container, and seal it as soon as possible after use. Also need to stay away from oxidants, strong bases, strong acids and other substances.

3. When storing ester lubricants, place them in a well-ventilated place. Avoid contact with skin and eyes as much as possible during use. Of course, be careful not to inhale its vapors and sprays. And so on;

4. The exhaust pressure of R404a refrigerant is almost 1.2 times higher than that of R22, and the mass flow rate is 1.5 times that of R22 refrigerant. Therefore, when the exhaust flow rate increases, Its flow resistance is also increasing. Therefore, when R404a refrigerant is used, its heat transfer capacity is increased by 20% to 30% than when R22 is used;

This article is about R404a refrigerant when it replaces R22. Part of the precautions will be introduced here. Next time we will introduce the remaining part for everyone, welcome to continue to pay attention!