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Video of HVAC 149 Vacuum p16 Example 4 Standard manifold in HVAC course by Love2HVAC with Ty Branaman channel, video No. 176 free certified online
The slowest and least accurate method pulling a vacuum, also the most commonly uses with standard manifold gauges and 1/4" hoses
In this example I have placed the Vacuum/Micron gauge at the pump as it is seen often. However I also have a vacuum gauge/Micron gauge at the evaporator coil. This will show how inaccurate a micron gauge at the pump is.
With method I also demonstrate the difficulty of keeping the hose clean from the vacuum pump to the refrigerant tank.