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4 Detection methods When a system is thought to have a leak, the whole system should be checked, with leaks found being marked for rectification. One should never assume a system has only one leak. Leak detection is the manual procedure, carried out by a qualified technician, of checking refrigeration systems to identify possible leaks in tubes, joints and/or connections, etc. Generally, the main methods for detecting leaks in the servicing field are: Note: Fault-finding There are a number of problems that may develop in RAC systems that would have the same symptoms as a refrigerant leak. For example: the fan, the compressor and various controls could be in operation, but the system is not cooling. It is sensible to always determine the other possible reasons for poor operation before recharging the refrigerant into a system. Also adding refrigerant to a system that does not necessarily need it can adversely affect its performance, including reducing its efficiency. It can also present significant safety hazards such as causing elevated pressures above what the system can tolerate. Topping-up If a system has a deficit of refrigerant, it is highly likely that this is because of a refrigerant leak. Often, technicians take the approach of quickly “topping-up” a system to its original charge amount, since this a quick and easy way of getting the system to work properly again. However, this is only a temporary, costly, and environmentally unacceptable approach to take. No refrigerant should be added to the system without first locating and repairing the leaks. Simply adding refrigerant will not permanently correct the problem, and in fact, it accelerates the degradation of the system in the longer term, thus reducing its operational lifetime. Instead, the technician should identify the leaks before recovering the refrigerant, to avoid contaminating the surrounding air with refrigerant from a newly open system, remembering that refrigerant should not be vented to the air. Using soap solution 4 Using an electronic refrigerant detector 4 Using an ultra-violet lamp 4 Using a halide torch 4 99 Servicing PracticesPDF Image | Manual for Refrigeration Servicing Technicians
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