Refrigerant level of security and safety standards

1, for refrigerant number and safety level of national standards of the People's Republic of China state bureau of quality and technical supervision issued on January 10, 2001 by GB/T7778 - 2001 'classification of refrigerants number method and safety, its for refrigerant safe level equivalent to ANSI/ASHRAE - classification rules 34 - 1997 standard. After the revised GB/T7778 - 2008 'classification of refrigerants number method and safety. From the standard level, Europe and the United States and Japan have been allowed to low flammable or combustible material used as refrigerant in certain situations. ISO 817— 2014、ISO 5149— 2014年,ASHRAE这样- 34 - 700-2014 and AHRI 2015 standard enacted to promote the application and promotion of flammable refrigerants. In the latest revision of GB/T 7778, 34 - reference ANSI/ASHRAE 2014, based on toxic and flammable refrigerant can be divided into A1, B1, A2L, B2L, A2, B2, 8 classes of A3 and B3, refrigerant number method and the main safety classification standard and international standard and unified. 2 mainly refers to the safety of refrigerant, refrigerant security levels: the toxicity, combustibility and explosive refrigerants, refrigerant security levels with A, B, C + 1, 2, 3, said the safest A1, C3's most dangerous. Security level for C ( C1, C2, C3) Material generally cannot be used as a refrigerant. The security level of common refrigerants are as follows: A1: R11, R12, R13, R113? , R115, R116, R22, R124, R23, R125, everything, R227ea, R236fa, R1233zd ( E) 、R1336mzz( Z) ,RC318 R218 R401a、R401b R402a, R402b, R403a, R403b, R404a, R407a, R407b,,替代工质R407c R407d, R408a, R409a, R410a, R417a, R422d, R500, R501,同,R507a, R508a, R508b, R509a, R513a, R744A2类:R142b, R152a, R406a, R411a, R411b, R412a, R413a, R415b, R418a, R419a, R512aA2L类:R143a, R32, R1234yf R1234ze ( E) A3: R290, R600, R600a, R601a and R1270, RE170, R510a, R511aB1 classes: R123, R245faB2L: R7173, cooling and heating with mechanical refrigerants used in refrigeration system security requirements of standards of China refrigeration and heating with mechanical refrigeration system GB9237 - safety requirements 2001 the refrigeration system and heat pump safety and environmental requirements, equivalent the ISO5149 - 1993 standard for R170, 290, 600 a, 1150, 1270, with strict restrictions, belong to the compulsory standards. This standard is applicable to all kinds of refrigeration system, regulation and refrigeration system design, manufacture, installation and operation of relevant safety requirements. The standard rules for HFC32 and HC290 A2, A3 flammable refrigerant, it is prohibited to use in the human comfort air conditioning system. GB9237 refrigeration system and heat pump safety and environmental requirements in recent revision to eliminate the use of low GWP, flammable refrigerant barriers, will no longer be flammable refrigerant application is prohibited. When no ventilation measures, the maximum filling amount, volume requirements do the rules of the room, and the calculation formulas; When ventilation, relief valve etc measures, can magnify the refrigerant filling quantity.
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