Hermetic recycling machines may overheat when pulling a deep vacuum because the unit relies on the flow of ______ through the compressor for ______.

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The cooling of a hermetic recycling machine’s compressor is achieved by the refrigerant itself flowing through the compressor. As the refrigerant circulates, it absorbs heat from the compressor, carrying it away as it moves through the system. When a deep vacuum is pulled, the refrigerant flow can be reduced or disrupted, so heat isn’t removed efficiently and the compressor can overheat. This is why refrigerant cooling is the correct description. Oil provides lubrication, not the primary cooling path; water and air aren’t the designed cooling mediums for this unit.