The characteristics of refrigerant R134a has a and used correctly

chlorine freon R 12 (for a long time CCL2F2) Has been the car air conditioning only refrigerants, the scientists found that over the years R 12 chloride can damage over 15 km - earth Within 25 km of the ozone layer, and then make more solar ultraviolet (uv) light can radiation to the earth harm to human body health, therefore, the international community in September 1987 in Canada entered into the Montreal protocol, clear rules for disable R 12 deadline for 2000, but in recent years due to damage to the ozone layer deepening, the international community the R R completely disable date early in 1995, developing countries may be delayed for 10 years. In 1992 our country issued a rule: each JiaoCheChang since 1996 in the car air conditioning gradually replace with new refrigerant R 134 a R 12, in 2000 produced a new cart banning reoccupy R 12. Thus, a car makes hand and repair personnel necessary to understand and learn about new refrigerant R134a has a characteristic, so it can skillfully, use correctly. The main features of refrigerant R 134 a 1 a. R 134 a does not contain chlorine atoms, the effect of atmospheric ozone layer can't afford to damage; b。 R 134 a has outstanding safety features ( Non-flammable, does not explode, non-toxic, no stimulation without corrosion) ; c。 R 134 a feature comparison of heat transfer in the near, so the refrigeration system retrofit compared to simple. d。 R 134 a heat transfer function is better than R 12, so the amount of refrigerant can be greatly reduced. 2 R 134 a with R12 refrigeration system is the main difference between a. Check R 134 a container for light blue, but check R 12 containers for white. b。 R 134 a refrigeration system to connect the hose is made of special rubber and nylon, and in its place have the marks of car engineering society ( 年代。 一个。 E. #J2196) ; Usually rubber hose and R12 refrigeration system commonly used to connect the hose. c。 R 134 a refrigeration system connecting pipe has a color symbol ( Low pressure pipe is blue with black stripes, high pressure pipe is red with black stripes, usually tube is yellow with black stripes) And R 12 refrigeration system connecting tube is unsigned. d。 R 134 rapid joint is used at the entrance of a refrigerant, refrigeration system and R 12 estimation using thread interface. e. R 134 a refrigeration system to connect the hose with 1/2 inch in the joint of thread with looks, and high pressure joint is larger than of low-pressure mouth mouth; And R12 refrigeration system to connect the hose with 7/16 in the joint of thread with looks. f。 Compared with R12 refrigeration system refrigeration system with high pressure and temperature, everything needs a larger cooling fan. 3 the use of everything and the repair matters needing attention. 一个。 Used in R 134 a of the instrument, equipment and measuring tool and so on can't with R 12 swaps, as if in the R 134 a mixed with R12 makes austerity surface is damaged, and it also may use instrument and the equipment damage. b。 R 134 a and R 12 refrigerant refrigeration oil do not mix, because R 134 a and R 12 refrigeration system of refrigerant oil are incompatible. R12 refrigeration system usually use homebred 18, 25 frozen oil or Japanese SUNISO3GS, SUNISO4GS, SUNISO5GS frozen oil, and everything system usually adopt of alkanes glycol, namely PAG ( Polyalokylene乙二醇) Oil or polyester ( 聚酯) Oil. c。 Maintenance refrigeration system with good safety protective glasses and gloves should be worn, avoid by all means let the liquid refrigerant to touch the skin, particularly in the hands and eyes, avoid frostbite. d。 The same PAG oil and R 134 a two layer separation will happen in high temperature and low temperature zone ( Both separation) Scene ( FIG. 1) Therefore, when filling R 134 demand will it in the heat of the hot water container, but don't exceed 40 ℃ temperature must stop using heating burner type of heating equipment, try to avoid two layer separation, avoid to tightening machine exhaust pressure and cooling brings bad influence. e. R 134 a system it is necessary to use special sealing and gasket, the use of cooling oil can make the system using R 12 blister sealing ring and gasket fails, then the refrigerant leakage. f。 When filling R 134 a, we should keep the containers of R 134 a in the upright position, guarantee the R 134 a in gaseous methods into the system, otherwise, R 134 a may be tightening surface by liquid method, make the tightening machine is damaged, other, filling work necessary in local air circulation, in case the operator has choked on the cylinder oxygen. g。 Reservoir dryer ( Or gas liquid separation device) It is necessary to seal, the device is necessary to rapidly; Otherwise, dryer air into the reservoir ( Or gas liquid separation device) Can make the desiccant absorption after temperature can be reduced, and even failure.

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