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3 CHAPITRE 3 PAGE 16 Typical multi-pass system • The multiple pass method re-circulates the recovered refrigerant many times through filter-driers. After a certain period of time or number of cycles, the refrigerant is transferred into a storage cylinder. Multiple-passes method recycling takes longer, Refrigerant recovery and recycling equipment The purpose of refrigerant recovery and recovery/recycling equipment is to help prevent emissions of refrigerant by providing a means of temporarily storing refrigerants that have been removed from systems undergoing service or disposal. Such equipment is used to temporarily store recovered refrigerant until the system undergoing repair is ready to be recharged or is prepared for disposal. Refrigerant recovery equipment may have the ability to store (recovery only) or the added capability of recycling (recovery and recycling) refrigerants. The temporary storage capability of the equipment prevents the release of refrigerants into the atmosphere that may otherwise exist if the refrigeration and air-conditioning equipment were opened to the atmosphere for servicing. The use of refrigerant recovery and recycling equipment is an essential means of conserving refrigerant during servicing, maintenance, repair, or disposal of refrigeration and air-conditioning equipment. Refrigerant recovery and recycling equipment could be made available to service technicians in every sector. Note that due to incompatibility issues and the array of refrigerants used in different sectors, refrigerant recovery/recycling equipment intended for use with one type of air conditioning system, such as motor vehicle air conditioners, may not be adequate to service air- conditioning and refrigeration equipment in the domestic, unitary, or commercial refrigeration and air-conditioning sectors. The types of refrigerants used in these sectors vary and all recovery/recycling equipment is not capable of meeting the same requirements. This is very important to users to ensure that their recovery but depending on the refrigerant level of contamination and moisture it may be essential, for example, if it is particularly dirty. This is shown in the diagram: MANIFOLD PRE-FILTER AC UNIT RECOVERY UNIT OIL SEPARATOR ACCUMULATOR COMPRESSOR OIL FILTER OIL DRAIN CONDENSER DRIER DRAIN FILTER DRIER SYSTEM OIL SEPARATOR RECEIVER & PURGE UNIT RECOVERY CYLINDER RECYCLE LOOP MOISTURE INDICATOR LIQUID PUMP RECYCLE SOLENOID Typical multi-pass system 74 OIL RETURN Refrigerant ManagementPDF Image | Manual for Refrigeration Servicing Technicians
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