The Difference Between R22 and R410A Refrigerant

how to choose r410a refrigerant

With the phasing out of R22 refrigerant, R410A refrigerant is used more and more widely. Many people asked if it is possible to directly replace the R22 in the system with the R410a. This is unreasonable practice. The physical and chemical parameters of the two refrigerants are different, and there are differences in the system design.

The difference between R22 and R410A refrigerant

1. R410A refrigerant needs to use synthetic refrigeration oil (POE). Due to the high hygroscopicity of POE oil, it is prone to hydrolysis. Compared with R22, the R410A system has stricter requirements on the moisture content.

2. Perfusion volume. After the structure of the heat exchanger is reduced, the perfusion volume of the R410A system is reduced by about 20% to 30% compared with the R22 system. The overall heat transfer characteristics of the R410A system are larger than that of the R22, the heat transfer efficiency is high, and the heat exchanger can be miniaturized.

3. R410A is a refrigerant mixed with HFC-32 (R32) and HFC-125. R410A has higher requirements for copper pipes, while R22 can use ordinary copper pipes. The operating pressure of R410A is 50~70% higher than that of R22, about 1.6 times.

4. R410A is of low toxicity, has no combustion propagation, and does not destroy the ozone layer. R22 is fatal to the ozone layer;

5. Even if R410A does not destroy the ozone layer, it will produce greenhouse gases, and its greenhouse gas effect even partially exceeds that of R22. Therefore, R410A is not the ultimate eco-friendly refrigerant solution.

6. The vapor density of R410A is higher than that of R22, so the vapor flow rate of R410A is about 30% slower than that of R22. R410A is more soluble than R22. When the residue floats on the R410A, it can be smoothly circulated in the system.

Other considerations

1. R410A copper pipe must use high-strength and compression-resistant copper pipe, and spare parts must also use special-purpose copper pipe. R410a copper pipe can be used instead of ordinary R22 copper pipe, but R410a copper pipe cannot be replaced with ordinary R22 copper pipe.

2. When installing the new refrigerant R410A, it should not be confused with the connecting pipe and refrigerant used in the R22 air conditioner.

3. R410A air conditioners have high installed capacity requirements. Do not drip sweat into the connecting tube, and do not mix other insoluble impurities into the system.

4. During maintenance, if the refrigeration system is cut, the filter drier must be replaced, and the refrigeration system should not be exposed to the air for more than five minutes.

5. R410A refrigerant should be stored in an environment below 30°C. If it has been stored in an environment higher than 30°C, it must be stored in an environment below 30°C for more than 24 hours before it can be used.

6. The R410A system uses a four-way valve to have clear requirements for cleanliness, while the R22 system uses a four-way valve to have no requirements for cleanliness.

7. The design maximum working pressure of the globe valve is different. Using refrigerant R22 is 3.0 MPa, and using refrigerant R410A is 4.3 MPa. R22 is a 3.0 MPa brass fitting and R410A is a 4.3 MPa stainless steel fitting.

8. The pressure value of the pressure switch is different. R22 system usually chooses 3.0/2.4MPa, R410A system usually chooses 4.2/3.6MPa.

9. Under the rated voltage, the capacity of each displacement (1cc) of the R22 system compressor is about 175W, and the capacity of each displacement (1cc) of the thermal R410A system compressor is about 245W, which is 65% to 70% of the R22 system. about.

10. The outdoor unit of the refrigeration system is marked with the type of refrigerant used by the equipment, and the type of refrigerant marked with the refrigerant can be used. R22 cannot be directly replaced with R410a.


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