HVAC - EPA Certification Practice Exam

The necessary temperature for removing oil from a low-pressure system is 130 degrees. This temperature is critical as it helps to ensure that the oil reaches a viscosity that allows it to flow freely, which is essential for proper removal. In low-pressure systems, oil tends to have different characteristics compared to high-pressure systems, often becoming more viscous as the temperature lowers. By reaching 130 degrees, the oil is sufficiently heated to allow for efficient draining, reducing the potential for any residual oil to remain in the system.

Additionally, this temperature helps to minimize the chance of contamination during the removal process, as warmer oil is more likely to separate from the system components. While other temperatures listed may be important in different contexts, 130 degrees is specifically recognized as the optimal threshold in industry practices for ensuring that oil can be effectively removed from a low-pressure system.