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3 equipment is capable of handling the specific refrigerants that are used in the system. The specific identification of the equipment is important throughout its service, disposal or end-of-life. Recycling equipment is expected to remove oil, acid, particulate, chloride, moisture, and non-condensable (air) contaminants from used refrigerants. The effectiveness of the recycling process can be measured on contaminated refrigerant samples according to standardized test methods, such as those within the standards ISO 12810 and ARI 700. Unlike reclaiming, recycling does not involve analysis of every batch of used refrigerant and, therefore, it does not quantify contaminants nor identify mixed refrigerants. Subsequent restrictions have been placed on the use of recycled refrigerant, because its quality is not proven by analysis. A variety of recycling equipment is available over a wide price range. Currently, the automotive air-conditioning industry is the only application that prefers the practice of recycling and reuse without reclamation. Acceptance in other sectors depends on national regulations, the recommendation of the cooling system manufacturers, the existence of another solution such as a reclaim station, variety and type of systems, and the preference of the service contractor. Recycling with limited analysis capability may be the preference of certain developing countries where access to qualified laboratories is limited and shipping costs are prohibitive. For most refrigerants there is a lack of inexpensive field instruments available to measure the contaminant levels of reclaimed refrigerant after processing. Refrigerant recovery equipment has been developed and is available with a wide range of features and prices. Some equipment with protected potential sources of ignition also exists for recovery of flammable refrigerant. Testing standards have been developed to measure equipment performance for automotive (SAE) and non-automotive applications (ISO). Although liquid recovery is the most efficient, vapour recovery methods may be used alone to remove the entire refrigerant charge as long as the time is not excessive. Excessive recovery times should be avoided, since extended recovery time periods may limit the practical usage of recovery equipment on the majority of refrigeration or air-conditioning equipment that contain up to 5 kg of refrigerant. In order to reach the vacuum levels that are required in some countries for larger systems, vapour recovery will be used after liquid recovery. Performance standards for refrigerant recovery equipment are available for service of both motor vehicle air conditioners (e.g., SAE J1990), and stationary refrigeration and air-conditioning systems (e.g. ARI Standard 740). Adoption of such standards as a part of common service procedures could be adopted by regulating authorities. 75 Refrigerant ManagementPDF Image | Manual for Refrigeration Servicing Technicians
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