In a pump down system, where is the solenoid valve located?

In a pump down system, the solenoid valve is typically located before the metering device. This placement is crucial because the solenoid valve controls the refrigerant flow into the evaporator by opening or closing in response to the system's operational needs. By positioning the solenoid valve upstream of the metering device, it can effectively regulate the pressure and ensure that the system operates efficiently during the cooling cycle.

When the solenoid valve is closed, it allows the refrigerant to be pumped down into the receiver, preventing it from entering the evaporator. This action is part of managing refrigerant charge and preventing issues associated with low-pressure conditions during off cycles. Consequently, the solenoid's position before the metering device is essential for controlling refrigerant flow and maintaining system integrity in refrigeration applications.