it requires a minimum differential pressure of approximately 0

ensuring consistent control circuit performance

System Reliability: Creates a robust seal for the bellows assembly

independent dry contacts for flexible system interlocking and signaling

Broad Compatibility: Fits a wide range of Lennox Elite and Merit series furnaces

Nordyne 664275R TXV 318518-761 it requires a minimum differentialThe Nordyne 664275R TXV is a critical N Series thermal expansion valve engineered specifically for 5 ton packaged units. Designed for R410A refrigerant, this OEM component provides precise metering to maintain the correct superheat across the evaporator coil, preventing liquid slugging and ensuring compressor longevity. As a direct Nordyne replacement part, it eliminates the compatibility issues often found with universal aftermarket valves,