Which statement is TRUE regarding a solenoid in a pump down system?

In a pump down system, the solenoid is designed to control the flow of refrigerant and is positioned before the metering device. This placement is crucial because the solenoid valve can help to manage the refrigerant by allowing it to flow to the metering device only when the system is operational. When the system is turned off, the solenoid closes, isolating the refrigerant and preventing it from flowing through the metering device, which allows the refrigerant to be pumped back into the compressor for storage.

Having the solenoid located before the metering device ensures that the refrigerant is appropriately managed during the pump-down process, providing system efficiency and protecting the components from potential flooding during non-operational periods. This configuration is an important aspect of how pump down systems function effectively within HVAC applications.