Filter drier in the refrigeration circuit: what it does and when it needs replacement

The filter drier protects the refrigeration circuit from moisture, acids, and small solid particles.

Role

It contains desiccant and filtering material that helps keep the refrigerant and oil clean.

When to replace

After opening the circuit, severe compressor failure, or when there are signs of moisture or restriction.

Restriction symptom

A drop in temperature or pressure may occur before and after the filter.