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3 Recycling of refrigerant Recovered refrigerant may be reused in the same system from which it was removed or it may be removed from the site and processed for use in another system, depending upon the reason for its removal and its condition, i.e., the level and types of contaminants it contains. There are many potential hazards in the recovery of refrigerants, and recovery and reuse need to be monitored carefully. Potential contaminants in refrigerant are acids, air, moisture, high boiling residues and other particulate matter. Even low levels of these contaminants can reduce the working life of a refrigeration system and it is recommended that recovered refrigerant should be checked before reuse. Refrigerant from a unit with a burnt-out hermetic compressor is reusable providing it has been recovered with a recovery unit incorporating an oil separator and filters and that it has been checked for acidity. To check the acid content of any reclaimed oil it is necessary to use a refrigeration-oil-test-kit. Usually it is only a matter of filling a test bottle with the oil to be tested and mixing it with the test liquid inside. If result shows purple: oil is safe. If liquid turns yellow this would show the oil is acidic - and refrigerant/oil should not be used in system. Such material should be sent for reclamation or destruction. Refrigerant recycling There are in the market several units that recovers, recycles, evacuates and recharges – all in one fast, continuous operation through one hook-up; these are called refrigerant recycling machines. If it is to be returned, the next issue is the condition of the refrigerant. When the oil is separated from the refrigerant, the vast majority of the contaminants are contained in it. Most refrigerant recycling machines utilise filter-driers to remove any other moisture and acid as well as particles. It is generally acceptable to return this refrigerant to the system. CHAPITRE 3 The real problem occurs when there is a burnout in a hermetic comprePsAsoGrE. A15burnout is the result of electrical failure inside the compressor of the refrigeration system. This can be due to variety of factoTrysp. Cicoanl tsainmginleatpioansos fstyhseteremfrigerant in this situation can range from mild to severe. Two recycling standard methods are used by equipment on the market. The first is referred to as single pass, and the other is a multiple pass. There is equipment that provides operation in both methods. • The single pass recycling machines process refrigerant through filter-driers and /or distillation. It makes only one trip from the recycling process through the machine and then into the storage cylinder. This image shows a typical single pass system. MANIFOLD PRE-FILTER AC UNIT OIL FILTER COMPRESSOR OIL DRAIN RECOVERY UNIT OIL SEPARATOR ACCUMULATOR DRAIN DRIER CONDENSER Typical single pass system PURGE UNIT 73 OIL SEPARATOR FILTER DRIER SYSTEM RECOVERY CYLINDER OIL RETURN Refrigerant ManagementPDF Image | Manual for Refrigeration Servicing Technicians
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