Desiccants are used in which component of a refrigeration system?

• A. Condenser
• B. Suction line
• C. Driers
• D. Compressor

Answer: (C)

Moisture control is the key idea. Desiccants are materials that absorb water, and in a refrigeration system they’re placed in the filter-drier assembly. As refrigerant flows through the drier, the desiccant removes moisture from the liquid and vapor, keeping the refrigerant dry. This is important because water in the system can react with refrigerant and lubricant to form acids, cause corrosion, create sludge, and even freeze in the metering device, all of which can harm performance and reliability. The condenser, suction line, and compressor handle heat rejection, gas flow, and compression, but they aren’t designed to remove moisture. The filter-drier is specifically built to filter debris and dry the refrigerant, which is why desiccants belong in the drier.