Summer issue of inspection and repair automobile air conditioning Collection
Summer, car air-conditioning fault has to enter this period. Whether large scale automotive plant, a repair shop or the street, in the summer seasonal conservation repairs are paid special attention in the automotive air conditioning system fault detection and maintenance, and related equipment and air conditioning maintenance, tools and supplies. To enable professionals to become more familiar with automotive air conditioning repair market, repair and maintenance business for the purchase related equipment, tools and supplies to provide a useful reference for all-round promotion of automotive air conditioning repair mainstream technology and industry high-technology products, so that maintenance personnel have the necessary The device uses techniques and troubleshooting methods to make the reader a more comprehensive understanding of the automotive air conditioning repair market situation, introduce the “automotive air conditioning repair project.”
Leak after maintenance work, you need to add the word refrigerant recovery machine into use. Refrigerant recycling machines in the summer as a filling for business profits of the most important equipment, its purchase, use, and troubleshooting problems also become a professional obsession. Similar concern, as well as refrigerant and refrigerant oil, air-conditioning running them as an essential medium used in the grade, quality, note the use of identification and pumping must be attention. In addition, the automotive air conditioning system in the maintenance of the inevitable need to replace certain parts, accessories and the quality is good or bad impact on the operation of air conditioning system is very large, important for the cooling effect is good or bad. The project will address these issues of common concern professionals, specialized analysis of.
Air conditioning repair profile articles
Automotive air conditioning system according to their function can be divided into refrigeration systems, ventilation system, ventilation system control control systems and air purification systems five basic components, each system might be some trouble, sometimes, some of the more a comprehensive system of concurrent fault. Maintenance personnel in the air-conditioning maintenance on the following issues need attention.
1. Understand the structure of air-conditioning system, control method and control circuit
Only familiar with the revised structure and working principle models, can be successfully troubleshooting. Many new cars now have been widely used variable displacement compressor, a fixed or electronically controlled throttle, in analyzing the failure of such systems, we must grasp the conditions for variable displacement compressors, or will not be an accurate diagnosis the real cause of failure. For instance, some vehicles, air-conditioning system blowing hot air sometimes, and sometimes chilling by cold phenomenon, appears to regulate air board failure may actually be ahead of variable displacement compressor problems. In addition, emissions often variable displacement compressor refrigerant purity of the same or not when the failure occurred evaporator icing.
The automatic air conditioning, air conditioning electronic control unit (ECU) according to multiple sensor signals, the system accurately control the temperature, its structure and control method is more complex maintenance to comprehensive analysis of many factors. Also note that the failure of the system combined with self-diagnostic function for quick and efficient treatment failure.
2. Fully bound by the system requirements and amount of qualified system corresponding to the refrigerant and refrigerant oil
For refrigerant charging, maintenance repairman, there are still errors, many people think that no bubble dryer observation window, the system pressure to normal, or that the refrigerant charge is completed. In fact, there are problems with this operation. As the refrigerant will be with the outside temperature and condenser cooling capacity change, often appear “out of the cooler air-conditioned cool, hot, hot air out” situation, the correct action is based on the quantitative use of vehicles full description Note. Refrigerant oil also required to accurately grade and amount of filling, less will not achieve lubrication, excess oil will occupy the volume of the condenser, so that the condenser pressure is too high due to poor cooling effect.
3. Good use of manifold pressure gauge on the air-conditioning system basic diagnostic
Learn and be good at using the manifold pressure gauge on the air conditioning system diagnostic helpful. Maintenance staff should have two manifold pressure gauge, a set of R134a, a set of R12, the two non-mixed. In the ambient temperature is 20 ℃, the air conditioning pipe work pressure in the low pressure side is generally 103 ~ 241kPa, high-pressure side of the working pressure is generally 1103 ~ 1517kPa, different environmental temperatures and different air-conditioned cars will be slightly different pipeline pressure .
4. The balance of the cooling conditions of the circulatory system of work should give full consideration
Refrigeration cycle equilibrium conditions of work, one is the balance of the evaporator and the condenser, the other is the compressor and the throttle valve (expansion valve) balance. The balance of the evaporator and the condenser, evaporator, absorbing heat that depends on the condenser to the atmosphere to completely distributed, and if the blocked condenser fan cooling causes abnormal working poor, will result in liquid refrigerant can not be good , system pressure and temperature will be further increased, allowing high-pressure system pressure is too high, poor cooling effect. Similarly, if the radiator because the temperature is too high, the long term cycle air conditioning and vehicle Mifengbuyan other causes excessive absorption of heat will cause the condenser cooling capacity less. Therefore, an appropriate increase of the cooling condenser, evaporator cooling will help. Evaporator and condenser to balance the heat between refrigerant circulatory system is the key to work properly.
Compressor and throttle is a pair of equilibrium relations. When replacing the compressor, the model they should pay particular attention, when the compressor wear and tear, if the piston Mifengbuyan, will result in the displacement compressors decline, the relative amount of throttle will produce liquid transportation imbalances. If the mechanic to adjust throttle opening tune was inappropriate, it will impact on the cooling effect.
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