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using dry nitrogen to triple purge and evacuate. pull vacuum a/c system to 500 microns or lower and hold for 1 hour. 29" vacuum is not even near 500 microns. ( short simple explain ) From 0 vacuum to 29 is like lifting your pillow over your head, but going that last little bit to 500 or below is like lifting your refrigerator over your head and walking up the stairs of a 10 story building. This is what you need to do to help get out as much moisture as possible from the A/C system.