Question 103Refrigeration & AC - 1st Asst/Chief

The correct answer is B) liquid line solenoid. In a refrigeration system with low-side pump down, the temperature of the refrigerated space is controlled by a thermostat that is wired to the liquid line solenoid valve. This solenoid valve opens and closes to regulate the flow of liquid refrigerant into the evaporator, which in turn controls the cooling capacity and temperature of the refrigerated space. The other options are incorrect because: A) The suction line solenoid valve is not directly controlled by the thermostat in a low-side pump down system. C) The low-pressure cutout switch is designed to protect the compressor, not to control the temperature of the refrigerated space. D) The thermostatic expansion valve controls the flow of refrigerant into the evaporator, but it is not directly controlled by the thermostat in this type of system.