Question 225Refrigeration & AC - Assistant Engineer

You are correct, the answer is A) fully opening or closing. A liquid line solenoid valve controls refrigerant flow to the evaporator by fully opening or closing the refrigerant line, rather than throttling or sensing temperatures. The solenoid valve is either energized to open and allow refrigerant flow, or de-energized to close and stop refrigerant flow. This on/off control of the liquid line helps regulate the flow of refrigerant to the evaporator coil. The other options are incorrect because the liquid line solenoid valve does not sense temperatures (choices B and D) or throttle the refrigerant flow (choice C). It simply acts as an on/off switch for the refrigerant line.