Because R22 and R410A have different compositions and pressures, R410A needs to be filled in liquid, and the thickness of the copper tube of the machine is also different, so it is forbidden to mix the two refrigerants. Maintenance measuring instruments and quantitative refrigerant charging equipment should also be dedicated.
According to the air-conditioning installation or maintenance process (national standard or industry-related standard): when the connecting pipe between indoor and outdoor units of air-conditioning installation exceeds the standard length by more than 5 meters, the refrigerant should be refilled in time. The operation effect is not good.
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R410A is a HFCs refrigerant mixed with two working fluids of R32 and R125 at a mass fraction of 1:1. Compared with R22, the condensation pressure of R410A is about 1.6 times that of R22. It is a high-pressure refrigerant and needs to improve the pressure resistance of the system. Compared with R410A, the saturation pressure of R32 refrigerant is about 2.5% higher.
Ten prohibitions on installation and maintenance of flammable refrigerant air-conditioning
1. It is strictly forbidden to engage in special operations without qualification certificates;
2. It is strictly forbidden to work at altitudes above 2m without wearing a safety belt or a safety rope;
3. It is strictly forbidden to smoke at the installation and maintenance site, and there should be no fire or high temperature heat source within two meters;
4. It is strictly prohibited to install without vacuuming or the vacuuming time is less than the specification requirements;
5. It is strictly forbidden to replace nitrogen with oxygen to maintain system pressure;
6. It is strictly forbidden to start and run the outdoor unilateral machine;
7. It is strictly forbidden to conduct welding repairs and use open flames or pipes with refrigerant in the welding system in the user's home;
8. It is strictly forbidden to recover the refrigerant under the negative pressure of the system, and the recovery time shall not exceed 1 minute;
9. It is strictly forbidden to use fake refrigerants, inferior refrigerants and different types of refrigerants to mix or substitute;
10. It is strictly forbidden to detect the system pressure in the startup state. In the standby state, the detection system pressure range is normal, and it can be powered on when there is no negative pressure.
