how to do a triple evacuation hvac

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An example of a triple evacuation is when you vacuum an empty system down to a certain level such as 1000 microns, then break the vacuum with nitrogen to a pressure of 5 PSIG for 5 minutes, then vacuum down to 500 microns, break the vacuum with nitrogen to a pressure of 5 PSIG for 5 minutes, then vacuum down to 200-300 microns.

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