How to Setup and Perform a Vacuum on an Air Conditioner. I time how long it takes to perform a vacuum using the two hose method and then I break the vacuum with nitrogen to 0 psig. I then time how long it takes to perform a vacuum using the single vacuum hose setup and then I break the vacuum with refrigerant from the bottle. I use valve core removal tools to remove the schrader valves during the vacuum. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Appr
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