Question 169Refrigeration & AC - Assistant Engineer

The correct answer is B) upright, controlled by a thermostat sensing the temperature of the box, and upstream of the thermal expansion valve. The box solenoid valve in a refrigeration system should be installed upright and controlled by a thermostat that senses the temperature of the refrigerated box, not the evaporator superheat. This ensures the valve opens and closes based on the desired box temperature, rather than evaporator conditions. Additionally, the solenoid valve should be installed upstream of the thermal expansion valve to regulate the flow of refrigerant into the evaporator. The other options are incorrect because they either have the solenoid valve in the wrong orientation (C), or in the wrong location relative to the thermal expansion valve (A and D).