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Summary This section will provide the technician with the ability to understand the causes of main operational problems presented by vapour compression refrigeration or air conditioning systems. It is important to understand how to avoid them through the adoption of good practices, and to be aware of the main precautions which should be taken when servicing installations and systems. Methods and techniques that are used when working on systems, primarily during servicing exercises, are discussed. In particular, this includes the consideration of system cleanliness (moisture, acid, non-condensable), and the means for overcoming these problems, such as proper evacuation methods and system purging. To avoid such issues in the first place demands appropriate procedures associated with tightness testing (“leak testing”) and refrigerant charging, which are described. 4 Technicians have the important role of making the operation of RAC systems the most energy efficient and decreasing refrigerant emissions. This can only be achieved by the adoption of good practices. The section starts with the evaluation of the problems due to the presence of moisture and contaminants in the system, and how to avoid them through purging and evacuation, charging, and leak testing. The important measurement instruments and tools necessary to achieve good servicing practices are included. A technician should be should be able to achieve the following servicing operations: • Leak detection, purging and evacuation. • Charging refrigerants. • Identifying the servicing-specific tubing tools and techniques of sizing, un-rolling, cutting, bending, flaring, swaging, piercing, pinching and welding. • Identifying the proper use of servicing instruments: manifold gauges, charging scales, and thermometers. Servicing PracticesPDF Image | Manual for Refrigeration Servicing Technicians
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