What is the primary function of a filter drier in an HVAC system?

The primary function of a filter drier in an HVAC system is to eliminate moisture. This is crucial because moisture within the refrigerant lines can lead to significant issues such as refrigerant acid formation, corrosion, and the potential for ice formation within the system components. By removing moisture, the filter drier helps maintain the integrity of the refrigerant and ensures the optimal operation of the HVAC system.

Additionally, filter driers often include a filtration component that captures contaminants and debris, but their primary role focuses on moisture removal due to its harmful effects on system performance. Keeping the refrigerant moisture-free is vital for preventing compressor damage and ensuring efficient heat exchange, thereby promoting the overall reliability and longevity of the HVAC equipment.