2025 HVAC Excellence Commercial Air Conditioning Exam Practice – Complete ESCO Certification Prep

In a multiple compressor setup, the suction lines enter a common header from the top. This design allows for optimal fluid dynamics and consistent pressure distribution within the header. By introducing suction lines from the top, it helps in managing refrigerant flow effectively and ensures that all compressors have equal access to the refrigerant vapor that is collected in the header.

Positioning the suction lines at the top also assists in preventing any potential oil accumulation from impacting the efficiency of the compressors. As refrigerant vapor rises, it can help push any accumulated oil down to the bottom of the header, minimizing the risk of oil return issues to the compressors. This configuration is important for maintaining system reliability and preventing operational problems that may arise from an improper suction header design.

In contrast, other positions like the bottom or sides could lead to complications with refrigerant flow dynamics and potentially hinder the system's overall efficiency.