Lennox 42W39 TXV 318518-761 This boiler burner assembly is

This boiler burner assembly is compatible with both natural gas and propane (LP) configurations

Optimized for 90A Contactors: Specifically designed for Copeland F1 series 90A contactors to ensure precise mechanical actuation

The York S1-073-05377-000 Vent Plate is a precision-engineered OEM component designed for high-efficiency gas furnaces within the Source 1 and Johnson Controls family

Enhanced System Isolation: Facilitates rapid refrigerant recovery and system evacuation by providing a reliable mechanical shut-off point

Lennox 42W39 TXV 318518-761 This boiler burner assembly isThe Lennox 42W39 is a high performance 3 ton thermal expansion valve (TXV) engineered for precise refrigerant metering in R410A systems. Designed to replace Lennox part 100679 26, this valve features a 5 8" ODF inlet and a 1 2" ODF outlet, ensuring a secure, leak proof solder connection. For any technician troubleshooting a 3 ton air conditioner or heat pump, this OEM component is critical for maintaining correct superheat levels across varying load