When a system contains excessive moisture it needs to be _______.

• A. Recharged
• B. Evacuated
• C. Repaired
• D. Replaced

Answer: (B)

When there’s excessive moisture in a refrigerant system, the first step is to evacuate the system. Moisture in the oil and refrigerant can form acids and sludge, cause corrosion, and lead to compressor damage or valve freezing. Pulling a deep vacuum with a vacuum pump removes air and moisture, making the system dry before any refrigerant is charged. This ensures the refrigerant charge stays pure and the oil remains clean, improving reliability and preventing future problems.

Recharging the system without removing the moisture would trap water in the refrigerant circuit, enabling acid formation and poor lubrication, which is why that option isn’t appropriate. Repaired or replaced would address other issues, like leaks or faulty components, rather than specifically resolving moisture contamination.