A filter drier is a refrigeration-line component that removes moisture and debris from refrigerant in HVAC systems. It protects sensitive parts like the expansion valve and compressor by keeping refrigerant clean and dry, preventing acid formation and corrosion. Filter driers are typically installed in the liquid line and are replaced during major service or when contamination is suspected.
/ˈfɪltər ˈdraɪər/
A filter drier is a refrigeration-line component that removes moisture and debris from refrigerant in HVAC systems. It protects sensitive parts like the expansion valve and compressor by keeping refrigerant clean and dry, preventing acid formation and corrosion. Filter driers are typically installed in the liquid line and are replaced during major service or when contamination is suspected.
What does a filter drier do?
It removes moisture and debris from refrigerant to protect the expansion valve, coils, and compressor.
Source: The Cooling Company
Filter driers protect coils and compressors from moisture.
After a compressor replacement, a technician installs a new filter drier to remove moisture and debris before restarting the system.
Replace the filter drier whenever the system is opened to the atmosphere or after a major repair to prevent moisture damage.
“Replace the filter drier whenever the system is opened to the atmosphere or after a major repair to prevent moisture damage.”
Modern HVAC systems are more sensitive to moisture, making filter driers more critical than ever.
How often should a filter drier be replaced?
Usually during major repairs, compressor changes, or if contamination is suspected.
What are signs of a clogged filter drier?
Reduced cooling, pressure drops, or icing near the drier can indicate restriction.
Can I replace a filter drier myself?
No. It requires refrigerant recovery and brazing, which should be done by a licensed HVAC technician.
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