Which component is designed to absorb moisture and contaminants from the refrigerant?

• A. Filter drier
• B. Sightglass
• C. Receiver
• D. Condenser

Answer: (A)

Moisture and contaminants in a refrigerant circuit cause a range of problems, from acid formation and corrosion to blocked metering devices and degraded lubrication. The component built to tackle both moisture and debris is the filter drier. It contains a desiccant that absorbs water and traps solid contaminants, so the refrigerant flowing through the system stays drier and cleaner. This helps prevent acid formation with oils, inhibits corrosion, and protects expansion devices and overall performance.

The other parts have different roles. A sightglass is a diagnostic tool that lets you see refrigerant presence and sometimes liquid level, but it doesn’t remove moisture. A receiver stores liquid refrigerant. A condenser rejects heat from the system. Therefore, the filter drier is the element designed specifically to absorb moisture and contaminants.