In a commercial refrigeration system, the liquid line solenoid valve is controlled by which device?

In a commercial refrigeration system, the liquid line solenoid valve is typically controlled by the low side pressure stats. This device monitors the pressure in the low side of the refrigeration system, which corresponds to the evaporator pressure. When the pressure drops below a set threshold, indicating that the evaporator is not adequately absorbing heat, the low side pressure stat will energize the solenoid valve. This allows refrigerant to flow to the evaporator, ensuring that the system can continue to cool effectively. By controlling the liquid line solenoid valve in response to evaporator conditions, the low side pressure stats help maintain optimal system performance and efficiency.

The other devices listed, while important in the overall operation of a refrigeration system, do not serve the specific function of managing the liquid line solenoid valve in the same direct and responsive manner as the low side pressure stats do. The compressor control switch regulates compressor operation based on system requirements but does not directly control the flow of refrigerant to the evaporator. The room thermostat typically regulates the temperature within the conditioned space but may not have a direct effect on the liquid line solenoid valve. The high side pressure stat is involved in monitoring the high-pressure side of the system and primarily acts as a safety device to prevent over