HVAC - EPA Certification Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success!

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What is the minimum vacuum level a vacuum pump should achieve in a vapor compression system?

1000 microns

500 microns

In a vapor compression system, achieving a minimum vacuum level is essential for the effective removal of non-condensable gases and moisture from the refrigeration system. A vacuum level of 500 microns is considered the minimum standard because it ensures that most moisture and air have been adequately removed.

At this level, the pressure is low enough to not only facilitate the efficient functioning of the system but also to prevent potential damage from moisture in the refrigerant, which can lead to acid formation and corrosion inside the system.

Achieving 500 microns is crucial because it correlates with a level of vacuum that can protect the integrity of the refrigerant circuit. While levels lower than this may be desirable in certain scenarios, a vacuum pump should at least meet the 500 microns threshold to ensure the system is thoroughly evacuated before charging with refrigerant, thus supporting optimal system performance and longevity.

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800 microns

300 microns

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