24 proceeds lowering the level of refrigerant until the end of the predefined time period when product in control solenoid valve 68 is again opened while it is not contemplated that large amounts of liquid contaminants will be collected in a single use in the event that it is the level of separated contaminants oil that activates level sensor 40 level sensor 40 will immediately close product in control solenoid valve each time the predefined time period expires this rapid cycling of product in control solenoid valve will be readily apparent to the operator of unit 200 who may then take steps to remove the contaminants from recovery and separation unit 24 as is described below as will be apparent to those of skill in the art heating coil 44 makes use of the otherwise wasted heat energy in the refrigerant which have been compressed by compressor 28 and also reduces the btuh capacity required for condenser 32 if equipment 300 contains a relatively large amount of refrigerant storage tank 304 may be filled prior to complete evacuation of equipment 300 in such a case filled storage tank 304 may simply be exchanged for a replacement storage tank by moving selector switch 242 to the off position closing product out control valve 104 and detaching the full storage tank 304 from pressure line 306 and attaching a replacement empty storage tank 304 to pressure line 306 product out control valve 104 is then re opened and selector switch 242 is moved back to the recovery position once equipment 300 has been substantially emptied of refrigerant as determined by monitoring the pressure on the high pressure side of compressor 28 with pressure gauge 230 product in and product out control valves 72.