The Amana-Goodman TX3N4 Thermal Expansion Valve is a crucial feature of HVAC systems that use R410 refrigerant since it enhances their performance and efficiency. To ensure ideal refrigerant flow and regulation, this TXV is specifically designed for systems with capacities ranging from 2.5 to 3 tons. The TX3N4 TXV regulates the flow of refrigerant into the evaporator coil and is installed in heat pump and air conditioning systems.