Which statement is true about the solenoid in a pump down refrigeration system?

In a pump down refrigeration system, the solenoid is located before the metering device. This positioning is crucial because the solenoid valve serves to control the flow of refrigerant into the evaporator. When the system is running, the solenoid opens to allow refrigerant to flow past the metering device and into the evaporator. In pump down operation, when the thermostat calls for cooling and the compressor starts, the solenoid closes to stop the refrigerant flow when the system is not actively cooling, which allows for better management of refrigerant and pressure.

The role of the solenoid in this context is to ensure that the refrigerant is only allowed to flow into the evaporator when necessary, thus protecting system components and enhancing efficiency. The metering device, which manages refrigerant flow into the evaporator, is placed after the solenoid in this setup. Understanding this sequence is essential for effective system operation and troubleshooting in a refrigeration system.