R22 Refrigerant Can Be Replaced By R410A

R22 refrigerant is widely used in medium and low-temperature refrigerants, usually used in household air conditioners, commercial air conditioners, mobile air conditioners, heat pump water heaters, dehumidifiers, refrigerated dryers, cold storage, food refrigeration equipment, marine refrigeration equipment, industrial refrigeration, Commercial refrigeration, refrigeration condensing units, supermarket display cabinets, and other refrigeration equipment. The new refrigerant R410A is composed of two quasi-azeotropic mixtures R32 and R125 with 50% each, mainly composed of hydrogen, fluorine, and carbon elements, and has the characteristics of stability, non-toxicity, and superior performance. Let’s take a look at the problems that should be paid attention to when replacing R22 refrigerant with R410A!

Instructions for using R22 and R410A

1. R22 refrigerant compressors generally use mineral oil. R410A refrigerant compressor generally uses organic synthetic oil, common POE (ether), and PVE (ester). R410A is not miscible with mineral oil. The mixing of mineral oil (for R22) into the R410A air-conditioning system will cause the refrigeration oil to deteriorate and hydrolyze to form metal salts. In addition, if it is mixed with other refrigerating machine oil, if the refrigerating machine oil is used incorrectly after the oil is mixed, a sludge phenomenon will occur and the capillary pipeline will be blocked.

2. The pressure of R410A is about 1.6 times higher than that of R22 refrigerant (absolute pressure = relative pressure or gauge pressure + 1 atmosphere or 1 kg force). Therefore, once the wrong operation occurs in the process of construction and after-sales service, a major accident may occur. When installing an air conditioner with R410A refrigerant, please use R410A tools and materials, and pay attention to safe operation.

3. When installing and moving the air conditioner, please do not mix the air other than R410A refrigerant into the refrigerant circulation pipeline of the air conditioner. If air and other gases are mixed in, it will cause abnormally high pressure in the refrigerant circulation pipeline, which is the main reason for the rupture and crack of the circulation pipeline.

4. Since the pressure of R410A is relatively high, piping, tools, etc. are used for special purposes. The wall thickness of the copper pipe must comply with the provisions of the amendment proposal of JISB 8607 “Flare mouth and connector for refrigerant use”, and select the copper pipe allowed by R410A according to the requirements.

5. When R22 is in normal operation, the suction pressure is 0.40~0.70Mpa (normal system back pressure is ≥0.5Mpa. When R410A is generally operating, the suction pressure is 0.70~1.15Mpa (gauge pressure) (absolute pressure = gauge pressure + 1 atmosphere)

6. The compressor is dedicated to R410A. The compressor is not allowed to compress the air, which may cause an explosion. R410A air conditioners have a filter drier, while air conditioners using R22 refrigerant generally do not have filter driers.

7. The compressor used in the R410A refrigerant machine is lubricated with POE oil. The POE oil and water can react to generate water and acid, and the generated water can promote the further reaction of the POE oil. If this chain reaction goes on for a long time, the water in the system will become more and more, which may cause the capillary to be blocked by ice. At the same time, the acidity of the circulating working fluid in the system will become higher and higher (the PH value will become lower and lower), which may lead to corrosion of parts in the system and copper plating. When installing the machine, it is forbidden to drip sweat into the connecting tube. It is strictly forbidden to mix other insoluble impurities into the system.

8. During maintenance, as long as the refrigeration system is cut, no matter what the reason is, the filter drier must be replaced. During maintenance, if you need to replace parts, you must use R410A special parts, and must not be mixed with R22.

9. Due to the R410A azeotropic refrigerant, it can also be charged in a liquid state (the basis for judgment is that the cooling or heating effect is slightly poor, or the pressure is lower than 15%). However, if there is more leakage or complete leakage, it must be evacuated with a vacuum pump, and it must also be filled with liquid.