SAE J1628:2020 pdf free

SAE J1628:2020 pdf free.Technician Procedures for Refrigerant Leak Detection in Service of Mobile Air Conditioning Systems
It is important to understand that some of the methods have limited ability to identify a leak, and the use of some methods (i.e., pressurizing the system with nitrogen gas or with a high pressure refrigerant) could cause damage to the refrigerant system. The industry has developed service procedures and equipment that provide appropriate ways to determine system refrigerant leakage and to minimize the use of additional refrigerant. In many cases, the technician will find it appropriate to use a combination of procedures to pinpoint a leak.
If the indicated leak is large, the technician should begin by confirming its existence by reviewing the vehicle A/C service history and visual inspection. A large leak is defined as one that results in a significant loss of the refrigerant charge within a single A/C cooling season, such as evidenced by failure to pass the vehicle manufacturer’s cooling performance test. Very low or no pressure in the system when the vehicle is received might be an indication of a very large leak, although it is recognized that no system is perfectly sealed and over a period of years all systems suffer loss of refrigerant. On-road life of motor vehicles has been lengthening, and at the time of this revision is almost 12 years, while at the same time, refrigerant charges have been reduced and improvements in seals have been made. So hoses and elastomer joints that rarely were areas of common concern for leakage may now require more careful inspection because of the effects of ageing, including from underhood thermal change effects, exposure to road film, and seepage of underhood vehicle fluids.
The most effective and reliable refrigerant leak detection methods include the following steps, starting with methods that will locate major refrigerant leaks, to methods that will locate leakage rates of a few grams per year. It should be noted that to minimize MAC system refrigerant emissions and assure consumer satisfaction, identifying all potential system refrigerant leakage can only be accomplished by using the correct procedures and in conjunction with electronic and trace dye diagnostics.SAE J1628 pdf free download.