What does a receiver-drier do in a refrigerant system?

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Moisture in refrigerant can cause big problems like ice in the metering device, corrosion, and acid formation that can damage components. A receiver-drier sits in the liquid line and serves two main jobs: it provides a reservoir to store liquid refrigerant and it uses a desiccant to absorb moisture while also filtering out contaminants. This keeps the refrigerant dry and clean as it circulates, protecting downstream parts and improving system reliability. It isn’t a compressor or a heater—the compressor handles compression, and heating isn’t the purpose of this component.