TL;DR
A filter drier is the canister installed in a refrigeration circuit's liquid line — or suction line after a compressor burnout — containing desiccant beads and a filter screen that capture moisture, acid, and debris before they reach the metering device. Moisture in a system forms ice at the expansion valve and breeds acids that attack compressor windings, so technicians replace the drier any time the system is opened for repair.
What it means
A filter drier is the canister installed in a refrigeration circuit's liquid line — or suction line after a compressor burnout — containing desiccant beads and a filter screen that capture moisture, acid, and debris before they reach the metering device. Moisture in a system forms ice at the expansion valve and breeds acids that attack compressor windings, so technicians replace the drier any time the system is opened for repair. Sizing matches line diameter and tonnage; an undersized or saturated drier shows up as a temperature drop across the shell.
Where it sits in the glossary
Filter drier is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.