From the condenser to the TEV, what is the correct order of liquid-line components?

• A. King valve, filter dryer, solenoid valve, sight glass
• B. Sight glass, filter dryer, solenoid valve, king valve
• C. Filter dryer, sight glass, king valve, solenoid valve
• D. King valve, sight glass, solenoid valve, filter dryer

Answer: (A)

The path from condenser to the thermostatic expansion valve is arranged to protect the system, allow control, and give you a way to verify liquid presence before metering. Start with the king valve so you can isolate the high‑pressure side for service or charging. Right after that comes the filter dryer, which removes moisture and contaminants that could damage the metering device or cause improper cooling. The next piece, a solenoid valve, provides electrical control of the liquid feed to the metering device, enabling shutoff or sequencing as needed. A sight glass follows, giving a visual indication of the liquid line flow and helping you confirm that liquid (not gas) is reaching the expansion device. Finally, the liquid enters the thermostatic expansion valve, which meters the refrigerant into the evaporator. The sequence protects the system and provides monitoring and control as the refrigerant moves toward the TEV.