Question 167Refrigeration & AC - 1st Asst/Chief

The correct answer is D) all of the above. Moisture in a refrigeration system can lead to several problematic conditions: 1) Corrosion of system piping - Moisture can cause corrosion of metal components in the refrigeration system, leading to leaks and potential system failure. 2) Hermetic motor burnout - Moisture can infiltrate the hermetically sealed motor, leading to short-circuits and motor burnout. 3) Freezing the expansion valve closed - Moisture can freeze in the expansion valve, blocking refrigerant flow and causing the system to malfunction. Therefore, the presence of moisture in a refrigeration system can result in all of these adverse effects, making option D the comprehensive and correct answer.