Question 64Refrigeration & AC - 1st Asst/Chief

The correct answer is B) charging valve as a liquid. To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the charging valve as a liquid. This is because the high side of the system is under pressure, and introducing the refrigerant as a liquid will allow it to be properly absorbed into the system. The other options are incorrect because discharging the refrigerant as a vapor (A) or through the suction service valve (C) would not properly charge the high side, while using the condenser purge valve (D) is not the correct method for adding refrigerant.