Receiver dryer condenses any vapour remaining in refrigerant.

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The receiver-drier sits in the liquid line to ensure a supply of liquid refrigerant that is both clean and dry. It stores refrigerant and uses desiccant to absorb moisture, protecting the system from moisture-related problems like corrosion and oil degradation. In addition, any small amount of vapor that remains can condense on the cooler surfaces inside the vessel, so what travels onward is predominantly liquid. This combination of storing liquid, removing moisture, and providing filtration is why this component is described as condensing remaining vapour and delivering dry, liquid refrigerant to the metering device and evaporator.