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A vaporizer has: an inlet (72); an oil outlet (90; 94); a vent (120); a hot gas inlet (132); and a cooled gas outlet (134). A gas flowpath (130) extends from the hot gas inlet to the cooled gas outlet. A vaporizer chamber (192) is downstream of the inlet along a primary flowpath. A gas conduit (220)

A vaporizer has: an inlet (72); an oil outlet (90; 94); a vent (120); a hot gas inlet (132); and a cooled gas outlet (134). A gas flowpath (130) extends from the hot gas inlet to the cooled gas outlet. A vaporizer chamber (192) is downstream of the inlet along a primary flowpath. A gas conduit (220) is along the gas flowpath in heat exchange relation with the primary flowpath. A sump (194) is below the vaporizer chamber. A housing (180) encloses the sump and the vaporizer chamber. A passageway extends from the vaporizer chamber to the sump.

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1. A system comprising: a compressor;a vaporizer comprising: an inlet,an oil outlet,a vent,a primary flowpath extending from the inlet to the vent,a hot gas inlet,a cooled gas outlet,a gas flowpath extending from the hot gas inlet to the cooled gas outlet,a vaporizer chamber downstream of the inlet

1. A system comprising: a compressor;a vaporizer comprising: an inlet,an oil outlet,a vent,a primary flowpath extending from the inlet to the vent,a hot gas inlet,a cooled gas outlet,a gas flowpath extending from the hot gas inlet to the cooled gas outlet,a vaporizer chamber downstream of the inlet along the primary flowpath,a gas conduit along the gas flowpath in heat exchange relation with the primary flowpath,a sump below the vaporizer chamber,a two-stage immersion heater,a housing enclosing the sump and the vaporizer chamber, anda passageway from the vaporizer chamber to the sump;an oil return line coupling the oil outlet to an oil return port of the compressor;an oil pump along the oil return line;a pressure reference branch conduit with a pressure reference branch flowpath branching from the oil return line and extending to a reference pressure port of the vaporizer; anda pressure regulating valve along the pressure reference branch conduit. 2. The system of claim 1 wherein: the passageway is a conduit external to the housing. 3. The system of claim 1 wherein: the sump is directly below the vaporizer chamber. 4. The system of claim 3 wherein: the housing is a single circular cylindrical housing. 5. The system of claim 3 wherein: the passageway comprises an external conduit extending between fittings along the housing. 6. The system of claim 1 wherein: a plate at least partially forms a top of the sump and a bottom of the vaporizer chamber. 7. The system of claim 1 wherein: the passageway is formed by a foraminate member. 8. The system of claim 1 wherein: a metallic tubular main body of the housing contains the vaporizer chamber and the sump; andan oil reservoir is mounted to the main body below the sump. 9. The system of claim 1 wherein: the heater has first and second elements in the sump. 10. The system of claim 9 wherein: the heater is an electric heater. 11. The system of claim 9 wherein: the gas conduit comprises a plurality of tubes with the gas flowpath passing through the tubes and the primary flowpath passing around the tubes. 12. A method for operating the system of claim 1 comprising: passing a gas flow into the hot gas inlet and out the cooled gas outlet;passing a refrigerant and oil flow into the inlet;transferring heat from the gas flow to the refrigerant and oil flow; andseparating the refrigerant and oil flow so that a refrigerant-rich portion exits the vent and an oil-rich portion exits the oil outlet. 13. The method of claim 12 wherein the method comprises, when the compressor is on: running with both stages of the heater off when either condenser refrigerant temperature is greater than a first threshold condenser refrigerant temperature or oil temperature is greater than a first oil temperature threshold;running with only one stage on when the condenser refrigerant temperature is not greater than the first threshold condenser refrigerant temperature and oil temperature is not greater than the first oil temperature threshold and either: condenser refrigerant temperature is less than a second threshold condenser refrigerant temperature which is lower than the first threshold condenser refrigerant temperature and motor speed is lower than a speed threshold; oroil temperature is either less than a second oil temperature threshold, lower than the first oil temperature threshold, or less than the saturated suction temperature plus a predefined increment; andrunning with both stages on: when the condenser refrigerant temperature is not greater than the first threshold condenser refrigerant temperature and oil temperature is not greater than the first oil temperature threshold and the oil temperature is both less than the second oil temperature threshold and less than the saturated suction temperature plus the predefined increment. 14. The system of claim 1 further comprising: a mist eliminator for separating liquid from a flow out the vent. 15. The system of claim 1 wherein: the gas conduit comprises a plurality of tubes with the gas flowpath passing through the tubes and the primary flowpath passing around the tubes. 16. The system of claim 1 wherein: the pressure reference branch conduit branches from the oil return line downstream of the oil pump.