How to use an AC vacuum pump to check refrigerant?

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Screw the AC vacuum pump to the center valve of the refrigerant gauge manifold set. Keep checking the gauge till the vacuum level reaches 27 Hg. Allow the pump to run for no less than 30 minutes. Close the valve that goes to the gauge. Turn the pump to the off position. Leave the equipment in place, without running the pump for another 30 minutes.

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