At what temperature should oil be removed from a low-pressure system to ensure a lower level of refrigerants in the oil?

• A. 105 degrees F
• B. 130 degrees F
• C. 150 degrees F
• D. 175 degrees F

Answer: (B)

The appropriate temperature for removing oil from a low-pressure system to ensure a lower level of refrigerants in the oil is 130 degrees F. At this temperature, the solubility of refrigerants in the oil is sufficiently reduced, allowing for more effective separation of the refrigerant from the oil.

As the temperature increases, the ability of the refrigerant to dissolve in the oil decreases, facilitating the removal process. This is particularly important in low-pressure systems, where adequate thermal management is crucial to minimize the presence of refrigerant in the oil and to maintain system efficiency. Therefore, 130 degrees F strikes a balance that allows technicians to effectively reduce refrigerant contamination and ensure that the oil is primarily free of these substances, which can enhance the performance and longevity of the refrigeration system.