Question 106Refrigeration & AC - 1st Asst/Chief

The correct answer is B) fully opening or closing. A liquid line solenoid valve controls refrigerant flow to the evaporator by fully opening or closing, rather than throttling the refrigerant. The solenoid valve is an on/off device that responds to an electrical signal, either allowing refrigerant to flow to the evaporator or shutting off the flow completely. It does not modulate or throttle the refrigerant flow based on temperature or superheat sensing. The other answer choices, such as sensing temperature or superheat, are functions of other components in the refrigeration system, not the liquid line solenoid valve itself.