Question 68Refrigeration & AC - Assistant Engineer

The correct answer is B) after the receiver in the liquid line. The refrigerant sight glass is typically located in the liquid line after the receiver to allow the operator to visually inspect the refrigerant flow and ensure there are no air bubbles, which could indicate a low refrigerant charge or other system issues. Placing the sight glass in this location allows the refrigerant to be observed in its liquid state, which provides the most accurate indication of the system's condition. The other options are incorrect because: A) the drain line to the receiver is not a good location for the sight glass, C) the suction line is a low-pressure area and not ideal for observing liquid refrigerant, and D) the discharge line is a high-pressure area that is not suitable for the sight glass.