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3 CHAPITRE 3 PAGE 11 Vapour recovery mode Vapour transfer The refrigerant charge can be recovered in vapour recovery mode as shown in this diagram. equipment manufacturers. Oil-less recovery equipment has an internal device to flash off the refrigerant. Oil-less compressors will tolerate liquid only if metered through a device like a CPR (crankcase pressure regulating) valve. Don’t attempt to use the liquid recovery method unless your unit is designed to recover liquid. Liquid recovery is performed the same way as standard vapour recovery. The only difference is that you will connect to the high side of the system. Recovering liquid is ideal for recovering large amounts of refrigerant. If the recovery unit does not have a built-in liquid pump or is otherwise not designed to handle liquid, then liquid can be removed from a system using two recovery cylinders and a recovery unit. The recovery cylinders must have two ports and two valves, one each for liquid and one each for vapour connections. Connect one cylinder liquid port directly to the refrigeration system at a point where liquid refrigerant can be decanted. Connect the same cylinder vapour port to the recovery unit inlet. Use the recovery unit to draw vapour from the cylinder, thereby reducing the cylinder pressure, which will cause liquid to flow from the refrigeration system in to the cylinder. Take care as this can happen quite quickly. The second cylinder is used to collect the refrigerant from the recovery unit as it draws it from the first cylinder. If the recovery unit has adequate onboard storage capacity this may not be necessary. Once the entire liquid refrigerant has been recovered from the refrigeration system, the connections can be relocated and the remaining refrigerant recovered in vapour recovery mode. Vapor Side Vapor Liquid Inlet Outlet DISABLED UNIT Drier Vapor Liquid SCALE On larger refrigeration systems this will take appreciably longer than if liquid is transferred. The connection hoses between recovery units, systems and recovery cylinders should be kept as short as possible and with as large a diameter as practicable. Liquid transfer Until recently, it was unheard of to recover direct liquid. But with the use of oil-less compressors and constant pressure regulator valves, it’s become the preferred method of recovery by most recovery Recovery Cylinder RECOVERY UNIT Vapour recovery mode 70 Refrigerant ManagementPDF Image | Manual for Refrigeration Servicing Technicians
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