When servicing a refrigerant system, which component should be replaced to ensure proper moisture control?

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Moisture in a refrigerant system can react with refrigerant and oil to form acids, cause corrosion, and even freeze in metering devices, leading to blockages and damage. The filter drier is the part that handles moisture by containing desiccant that absorbs water from the refrigerant and oil, plus it filters out contaminants. After servicing, the system is exposed to moisture, so replacing the filter drier ensures fresh desiccant is in place to remove any moisture that was introduced. The condenser and evaporator are heat exchangers, and the pressure relief valve is a safety device; neither is responsible for removing moisture. In short, replacing the filter drier maintains proper moisture control and protects the system.