What is the minimum velocity of freon oil to the compressor in horizontal suction lines?

The minimum velocity of freon oil in horizontal suction lines is crucial for ensuring the effective transport of oil back to the compressor. A velocity that is too low can result in inadequate oil return, leading to oil logging and potentially damaging the compressor due to insufficient lubrication.

The standard industry practice sets the minimum velocity at 800 feet per minute (fpm) for horizontal suction lines. This level of velocity effectively ensures that oil remains suspended in the refrigerant and is efficiently cycled back to the compressor. Maintaining this velocity helps to mitigate risks associated with oil starvation, which can compromise system performance and reliability.

Higher velocities, while beneficial in transporting oil, can also lead to other issues, such as increased pressure drops or noise. Hence, maintaining the minimum velocity at this level is both effective and practical for the system's operation, which aligns with established guidelines and best practices in HVAC and refrigeration systems.