Recovering refrigerant in which phase can reduce recovery time?

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Recovering in liquid form speeds things up because liquid refrigerant contains far more mass per unit volume than vapor. When you pull liquid into the recovery cylinder, you remove a large amount of refrigerant quickly with each pass, so the total time to recover the same amount is shorter. Vapor recovery relies on moving and condensing gas, which takes more time to achieve the same mass transfer. So, whenever liquid refrigerant is present, recovering it in the liquid phase minimizes overall recovery time, as long as you follow the equipment guidelines to avoid issues like liquid slugging the compressor.