R410A air conditioner and R22 air conditioner comparison

At present, the refrigerant commonly used in China is R22, which is a HCFC working fluid and has a destructive effect on the atmospheric ozone layer. According to the provisions of the International Montreal Convention, it is an obsolete working fluid. The Chinese government has promised to ban production and use in 2030. The new refrigerant R410A does not pollute the environment and is an ideal refrigerant to replace R22.

Compared with the air conditioner using r410a new refrigerant and the air conditioner using R22 refrigerant, the main differences are as follows:

1. The refrigerant is different (R410A) ;

2. The selected compressor is different, it is a new refrigerant compressor (dedicated);

3. New refrigerant R410A air conditioners have a filter drier, while air conditioners using R22 refrigerant generally do not have a filter drier.

4. Although the two devices and system piping in the new refrigerant R410A air conditioner are no different from the R22 air conditioner in appearance, its manufacturing process requires higher requirements. The water content and impurity content of the air conditioner are lower than that of the R22 air conditioner, and the pressure resistance is higher.

5. The manufacturing process is different, and the process requirements of the new refrigerant R410A air conditioner are quite strict.

Refrigeration system:

1. The high pressure of the refrigeration system is: 3.0MP, and the low pressure is: 1.2MP. (In the same situation, it is 1.5 times of R22)

2. When installing the new R410A refrigerant split, the connecting pipe used must be a special R410A pipe. When emptying, It must be evacuated with R410A refrigerant, not to be confused with the connecting pipe and refrigerant used in R22 air conditioner, otherwise it will affect the stability of the air conditioner.

3. Because the compressor used in the R410A refrigerant splitter is lubricated with POE oil, POE oil and water can react to produce water and acid, and the resulting water can promote The POE oil reacts further. If the chain reaction continues for a long time, the water in the system will increase, which may cause the capillary tube 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 becomes higher and higher). Low), it may cause corrosion of parts in the system and copper plating. Therefore, when installing the machine, the action must be rapid. After opening the plug of the connecting pipe, the nut must be tightened within five minutes, and the emptying time must be sufficient. When installing the machine, it is forbidden to drip sweat into the connecting pipe; it is strictly forbidden to mix other insoluble impurities into the system. In addition, when installing the R410A refrigerant split unit, it is best to do it on a sunny day, not on a rainy day, or when the humidity is high.

4. Chloride ions can also react with R410A refrigerant and POE oil to form acid to corrode the components of the refrigeration system. Therefore, do not mix chloride ions inside the system during installation. Such as dripping sweat and other impurities containing chloride ions.

5. During maintenance, as long as the refrigeration system is cut off, no matter what the reason is, the filter drier must be replaced. After cutting open the refrigeration system, you must immediately wrap the opening with something to prevent moisture in the air from entering the system. The refrigeration system shall not be exposed to the air for more than five minutes.

6. When replacing the filter drier, after opening the sealing plugs at both ends of the filter drier, it must be welded into the system within five minutes to isolate the air as soon as possible, otherwise Will affect the performance of the filter drier.

7. When vacuuming after the maintenance is completed, the vacuum pump used should be a special vacuum pump. The lubricating oil of this pump should be greased oil, and the pump should not be used for Use R22 air conditioner to vacuum, otherwise it will cause mixed pollution of refrigerant, which will affect the performance of air conditioner. The vacuuming time must be guaranteed to be more than 25 minutes. Otherwise, the moisture in the system will be too high, which will affect the stability of the air conditioner.

8. When repairing, if you need to replace parts, you must use R410A special parts, not mixed with R22, otherwise it will affect the stability of the air conditioner.

9. R410A refrigerant should be stored in an environment below 30°C. If it has been stored in an environment above 30°C, it must be stored in an environment below 30°C. It can be used after being stored for more than 24 hours, otherwise the composition of the refrigerant will change and affect the performance of the air conditioner.

Another new refrigerant R407C and R410A have similar precautions, the only difference is the refrigerant charge:

1. After a large amount of R407C leaks in the air conditioner, all the refrigerant in the air conditioner should be discharged and refilled after vacuuming. If there is only a small amount of leakage, it can be filled directly, but liquid filling must be guaranteed.

2. When the remaining amount of refrigerant in the refrigerant bottle is less than 10% of the full bottle (such as a 10Kg R407C, after 9Kg is used, the remaining 1Kg cannot be used) , The refrigerant can no longer be used.

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