Question 61Refrigeration & AC - 1st Asst/Chief

The correct answer is B) suction service valve as a vapor. When adding small amounts of refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the suction service valve and in a vapor state. This is because the suction service valve is connected to the low-pressure side of the system, where the refrigerant is in a gaseous state. Introducing the refrigerant as a vapor through this valve ensures it can properly circulate through the system and be drawn into the compressor. The other options are incorrect because introducing refrigerant through the discharge service valve or in a liquid state could potentially damage the system or create other issues.