Weak current College】 【auto air-conditioning refrigerant added parsing --- Power By】 【China power house network.

1. refrigerant not interchangeable

Auto air conditioning refrigerant at present mainly has two types of R12, another kind is 134a (HFC 134a one), R12 history are long and use a common, but the gas contains chlorine molecule will damage the ozone layer in the atmosphere and cause the greenhouse effect, so a few years ago the world on behalf of the Party of the Montreal Protocol, signed in recent years to halt the production and use of freon products that bear the brunt of R12. 134a is the use of the ' 90s, due to chlorine molecules on the ozone layer, without damage to the automobile air conditioning system changes less, be the relevant United Nations organizations recommended, in Guangdong, Hong Kong and other places called "environmentally friendly refrigerant," now the foreign and domestic new car air conditioning system is used the 134a refrigerant.

134a and R12 air conditioning system; both thermodynamic properties and system structure similar to the biggest difference is frozen oil. Refrigeration oil is compatible with the refrigerant, able to play on the compressor lubrication and chemically stable liquid lubricants, R12 refrigerant oil is a soluble in the mineral oil, Rl2 and 134a is a molecular polarity strong refrigerants, and total soluble in mineral oil is just as oil-water separation and cannot play a stream of air conditioning systems, sliding effect 134a refrigerant oil is commonly used something called PAG or ester lubricant, due to the particularities of lubricants, 134a air conditioning system for the rubber material requirements and their nature is 134a R12 differently, it can only be associated specifically with their work, all in the system's 134a air conditioning systems for vehicles, the manufacturer is in the compressor, condenser, evaporator. Rubber tube and filling equipment on a flag to prevent the misuse of 134a.

Currently imported automobile air conditioning equipment is the refrigerant used 134a, 134a refrigerant on the market price is three times that of R12, therefore some people in the car to install additional refrigerant for air time to save the money or just for the sake of convenience, 134a air conditioning system to R12 refrigerant filling, although can issue a cold wind, but will damage the compressor. Because the compressor had been injected some homogeneity frozen oil, although all pour will still be some frozen oil residue in the camera, two refrigerants frozen oil mixed with will slowly lose lubrication and compromise the machine, is that the gain, industry experts are proposed which refrigerants is filled into what kind of air conditioning, non-interoperability.

2. the quality of the work of the vacuum

On the vacuum, which is engaged in automobile air conditioning routine processes, the quality of its work is directly related to air conditioning service life. Installing auto air-conditioning or repair after installation, be sure to do full vacuum this process, the car vacuum not less than half an hour, buses taking out the vacuum time not less than one hour, some bus air conditioning also require adding nitrogen dehumidifier leak, together with nitrogen before to vacuum. Vacuum work is the air-conditioning piping systems for water extraction, because the water in the low-voltage State will evaporate into gas, was pumping gas machine draw outside the machine. If the vacuum is not enough time so that the water left in the tank, will harm the air conditioner.