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 liqued and one each for vapour connections. Connect one cylinder liquid port directly to the refrigration system at a point where liquid refrigrant can be decanted. connect the same cylinder vapor port to the recovery unit inlet. Use the recovery unit to draw vapor from the cylinder refrigeration system in to the cylinder. Take care as this can happen quite quickly.
The second cylinder is used to collet the refrigerant from the recovey unit as it draws it from the first cylinder. If the recovery unit has adequate onbord storage capacity this may not be necessary. once all the liquid refrigrant has been recovered from refrigeration system, the connection are be relocated and the remaining refrigerant recovered in vapor recovery mode. It may be found convenient to fit a liquid sight glass within the transfer line.
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