Yep. You charge the system as a synonym for adding refrigerant. The "charge" in the system is the total mass of refrigerants. You can "meter" in a charge using pressure and temperature, or you can "weigh" in a charge on an empty system using a scale on your source.
Yep. You charge the system as a synonym for adding refrigerant. The "charge" in the system is the total mass of refrigerants. You can "meter" in a charge using pressure and temperature, or you can "weigh" in a charge on an empty system using a scale on your source.