Charging Refrigerant: Checking the Charge Step by Step Procedure when you Don't Know the Rating!

This is How to Check the Charge on an R-22 Air Conditioning System that has a Piston/Orifice or Capillary Tube. I show you if you are correct or low on refrigerant by calculating for target superheat. After I go over how to check the charge with the gauge set using the Saturation temperature of the vapor line and actual temp, I then show you how I came up with the target superheat needed since the rating can not be found on the outdoor AC unit's rating plate-like in the case of the subcooling charging method.