Difluoromethane is a halogenated hydrocarbon (chemical formula: CH2F2), abbreviated as Difluoromethane R-32. It is a gas at room temperature, and a colorless and transparent liquid under its pressure. It is easily soluble in oil and insoluble in water. It is a refrigerant with zero ozone loss potential.

　　Before Difluoromethane R-32 entered the stage of history, R22 refrigerant dominated the air-conditioning industry for decades, but due to its greater harm to the ozone layer, according to the "Montreal Agreement" and "Kyoto Protocol", the withdrawal time limit of R22 has become more and more the closer.

　　Although R410A, which replaces R22 refrigerant, is not harmful to the ozone layer, it will cause the greenhouse effect to a large extent and aggravate global warming. The greenhouse effect of 1 kg of R410A released into the atmosphere is equivalent to 1900 kg of carbon dioxide emissions, while 1 kg of Difluoromethane R-32 is equivalent to 580 kg of carbon dioxide emissions, which is less than one-third of the former.

　　Against this background, Difluoromethane R-32, as a new generation of energy-saving, carbon-reducing, environmental-friendly, and non-toxic refrigerants, has become an excellent choice on the stage of history. However, its slightly flammable (international standards ISO817, and ISO5149 define the safety level of Difluoromethane R-32 as A2L, slightly flammable, that is, other ignition sources other than open flames cannot ignite Difluoromethane R-32, and it will automatically extinguish once it leaves the open flame) in In some cases, security issues may still arise.

　　Difluoromethane R-32 is flammable when the above three conditions are met. However, in several accidents related to Difluoromethane R-32 refrigerant, they are caused by a lack of safety awareness and irregular operation. At present, it is the peak season for the installation and maintenance of air conditioners every year. We call on the installation and maintenance masters to strictly abide by the following procedures and use the environmentally friendly refrigerant Difluoromethane R-32 safely.

　　Difluoromethane R-32 Refrigerant Safety Guide

　　1. It is strictly forbidden to run the Difluoromethane R-32 system without vacuuming;

　　2. It is strictly forbidden to run the compressor with no load when the valve is open;

　　3. It is strictly forbidden to remove the connecting pipe to check whether the compressor has suction and exhaust (whether the small valve has gas discharge);

　　4. It is strictly forbidden to start the operation when the valve is not opened;

　　5. It is strictly forbidden to use the air conditioner's compressor for pressure leak detection;

　　6. It is strictly forbidden to vacuum the compressor itself;

　　7. It is strictly forbidden to start the operation in a vacuum state;

　　8. It is strictly forbidden to add refrigerants of different working qualities or inferior refrigerants;

　　9. Refrigerant recovery is strictly prohibited for more than 2 minutes (applicable to household machines);

　　10. It is strictly forbidden to shield protection devices such as overload protectors, exhaust high-temperature protection, overcurrent protection, and high and low-pressure protection.

　　In addition to safe and standardized operation, Difluoromethane R-32 should not be careless during actual storage. It should be stored in a cool, dry, and well-ventilated warehouse to ensure that the temperature of the container does not exceed 50℃. Keep away from fire, heat, and direct sunlight. should be kept away from oxidizers, do not store them together. The lighting, ventilation, and other facilities in the storage room should be explosion-proof, and the switch should be located outside the warehouse.