HVAC - EPA Certification Practice Exam

What does an open compressor system frequently leak from?

1. Fixed seals

2. Rotating shaft seals

3. Welded joints

4. Connection pipes

The correct answer is: Rotating shaft seals

An open compressor system often experiences leaks mainly from rotating shaft seals. This type of compressor relies on a shaft to connect the motor to the compressor housing, and the point where the shaft exits the housing is a common area for leaks. The rotating shaft seals are designed to maintain pressure and contain the refrigerant within the system; however, over time, these seals can wear out or become damaged due to factors such as pressure fluctuations, temperature variances, and general wear and tear. The integrity of the rotating shaft seals is crucial for efficient operation, as any leak can lead to a loss of refrigerant, reduced efficiency, and potential damage to the compressor itself. Maintaining and inspecting these seals is a vital aspect of HVAC maintenance and operation to prevent refrigerant loss and ensure the longevity of the system. Other potential leak points, such as fixed seals, welded joints, and connection pipes, may experience issues but are not as commonly associated with open compressor systems as rotating shaft seals.