Refrigerant safety level and safety standard

1. National standards for refrigerant numbers and safety levels

The National Bureau of Quality and Technical Supervision of the People’s Republic of China issued GB/T7778- on January 10, 2001. 2001 'Refrigerant Numbering Method and Safety ClassificationIt was later revised into GB/T7778-2008 'Refrigerant Numbering Method and Safety Classification'.

From the perspective of standards, Europe, America and Japan have allowed low flammable or flammable substances to be used as refrigerants under certain circumstances. The promulgation and implementation of standards such as ISO 817-2014, ISO 5149-2014, ASHRAE-34-2014 and AHRI 700-2015 have promoted the application and promotion of flammable refrigerants.

In the latest revision of GB/T 7778, referring to ANSI/ASHRAE 34-2014, based on toxicity and flammability, refrigerants are divided into A1, B1, A2L, There are 8 categories of B2L, A2, B2, A3 and B3, and the refrigerant numbering method and safety classification standard are unified with the main international standards.

2. Refrigerant safety level

The safety of refrigerant mainly refers to the toxicity, flammability and Explosive. The safety level of refrigerant is represented by A, B, C plus 1, 2, 3, A1 is the safest, and C3 is the most dangerous. Substances with safety level C (C1, C2, C3) generally cannot be used as refrigerants.

The safety levels of common refrigerants are as follows:

Class A1:

R11, R12, R13, R113, R114, R115, R116, R22, R124, R23, R125, R134a, R227ea, R236fa, R1233zd(E), R1336mzz(Z), R218, RC318, R401a, R401b, R402a, R402b, R403a, R403b, r404a, R407a, R407b, R407c, R407d, R408a, R409a, r410a, R417a, R422d, R500, R501, R502, R507a, R508a, R508b, R509a, R513a, R744

A2 category:

R142b, R152a, R406a, R411a, R411b, R412a, R413a, R415b, R418a, R419a, R512a

A2L category:< /p>

R143a, R32, R1234yf, R1234ze(E)

Class A3:

R290, R600, R600a, R601a, R1270, RE170, R510a, R511a

Class B1: R123, R245fa

Class B2L: R717

3. Standards for the safety requirements of refrigerant application in mechanical refrigeration systems for refrigeration and heating

Safety of mechanical refrigeration systems for refrigeration and heating in China GB9237-2001 'Safety and Environmental Requirements for Refrigeration Systems and Heat Pumps' is required, which is equivalent to the ISO5149-1993 standard. There are strict restrictions on R170, 290, 600a, 1150, and 1270, which are mandatory standards. This standard is applicable to various refrigeration systems and specifies safety requirements related to the design, manufacture, installation and operation of refrigeration systems. The standard stipulates that the use of flammable refrigerants of A2 and A3 such as HFC32 and HC290 in human comfort air-conditioning systems is prohibited.

In the recent revision of GB9237 'Safety and Environmental Requirements for Refrigeration Systems and Heat PumpsAgent application. When ventilation measures are not taken, the maximum charge volume and room volume requirements are specified, and calculation formulas are given; when ventilation, safety valves and other measures are taken, the charge volume of refrigerant can be enlarged.

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