NATE AC Installation Practice Questions - NATE Air Conditioning Installation Specialty Exam

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When evacuating a residential split-system refrigerant circuit before charging, to what vacuum level should a technician pull the system to ensure moisture and non-condensables are removed?

29 inches of mercury (Hg) 500 microns or lower 5,000 microns 0 psig

Correct Answer:

500 microns or lower

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