HVAC CORE EPA

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What is the preffered instrument for detecting small leaks ?

Electronic leak detectors,One of the advantages of electronic leak detectors over other leak detection methods is higher sensitivity
What is an inert gas typically used in leak detection ?

To locate a leak on an empty system under the new EPA regulations,the system should be pressurized with an inert gas(DRY NITROGEN)
What is typically indicated by a dehydrated system failing to hold a vacum?
- To pull a vacum the system is first pulled down to approximately 29in.Hg and valved off.Any leak within the evacuated appliance will cause
- the system pressure to rise eventually reaching 0 psig.