■ Freon, generally adopted by us as automotive refrigerant, plays a crucial role in automotive refrigeration system. This system mainly comprises compressor, condenser, evaporator and throttle valve.
■ Among them, compressor is designed to compress the refrigerant at a low temperature and under a low pressure into the gas at a high temperature and under a high pressure, thereby raising the refrigerant temperature and pressure. Condenser is designed to cool the refrigerant at a high temperature and under a high pressure down to the liquid under a high pressure. Evaporator is designed to evaporate the liquid refrigerant under a high pressure to the gas at a low temperature and under a low pressure, thereby absorbing the heat inside car compartment. Throttle valve is designed to control refrigerant flow and thereby regulate the cooling performance of automotive air conditioner. Therefore, refrigerant quality has a direct influence on the cooling performance of automotive air conditioner.

■ Freon refrigerants are roughly divided into three categries, namely chlorofluorocarbons (CFC), hydrochlorofluorocarbons (HCFC), and hydrofluorohydrocarbons (HFC).
1. Freon refrigerants with chlorine but no hydrogen are named CFC, such as R12 (CF2CL2) and R11 (CFCL3), and they have a severely destructive impact on ozone sphere.
2. Freon refrigerants with both chlorine and hydrogen are named CFC, such as R12 (HCF2CL), and they have a weaker destructive impact on ozone sphere than CFC do.
3. Freon refrigerants with fluorine but no chlorine are named HFC, such as R134a, a refrigerant with no harm to ozone sphere, and they are also called environmentally friendly refrigerants.

■ MASUMA adopts the refrigerant HFC-134a, a new kind of environmentally friendly refrigerant (Tetrafluoroethane). The refrigerant is toxicity-free, explosion-free, non-corrosive to either metallic and non-metallic substances, incombustible, and easily detectable for any leakage; it features a chemical stability, no damage to lubricant and a high latent heat of evaporation; its ozone depletion potential (ODP) is 0; its holistic global warming potential (HGWP) is 0.3; in short, it presents an excellent environmental protection performance and does no harm to the environment. Applicable to automotive air conditioner, HFC-134a has a standard evaporation temperature at -26.5℃ and a freezing point at -101℃, and thus belongs to those refrigerants at a moderate temperature.

Can HFC-134a be interchanged with other refrigerants?

■ No! Refrigerant interchange will severely compromise both cooling efficiency and service life of the machine, disable the refrigeration device in air conditioner, jam the compressor, crack both condenser and refrigeration pipeline, and cause other failures. The refrigerant, the seal, the rubber ring and the desiccant of air conditioning equipment vary upon vehicle model.

Why does HFC-134a flow out as watery liquid?

■ HFC-134a has a boiling point at -26.1° C and therefore exists in a gaseous form at the ambient temperature and under an ambient pressure. The refrigerant adopted by us is filled into a tank under pressurization and some part of the gas will become liquid under pressure. Therefore, 134a in a normal tank exists in both gaseous and liquid forms. As we open the tank, 134a in the gaseous form will be emitted first; if the tank opening faces upside down, 134a in a liquid form will be released, too. In this case, we may notice 134a in a watery liquid.

■ During the 134a release process, no tank opening shall face human body part. 134a in the liquid form will quickly vaporize after release, and such gasification process will absorb heat around quickly, thus causing frostbite.
■ The refrigerant filling operation shall only be conducted by a professional refrigerant-filling operator.

THE WORK MECHANISM ON AIR CONDITIONING COOLANT CIRCULATION SYSTEM

■ Automotive refrigerant refilling is appropriate for once every 2 to 3 years. Operator shall pay a close attention to refilling amount all the time because excessive refilling may cause an abnormal air conditioning system；
1. Result in the pressure increment inside air conditioning system, trigger the high pressure alarm from automotive air conditioning system, and interrupt the compressor operation frequently, thus damaging the compressor if those abnormalities last for long;
2. Exacerbate the cooling performance;
3. Damage the components of air conditioner;
4. Crack the automotive air conditioning pipeline；

■ The continuously increasing car ownership in quantity has boosted the constant development in automotive air conditioner. It has become an indispensable part for our driving and traveling while having brought more comfort to our driving and riding experience. HFC-134a refriger ant by MASUMA works as the core of air conditioning system, and offers the guarantee for us to continue enjoying the comfort from vehicle by virtue of its excellent and stable performance.