Lennox 49W64 Reversing Valve

The Lennox 49W64 Reversing Valve is a critical 4-way component engineered for heat pump refrigerant flow control in residential and light commercial systems. Operating with a 24V solenoid coil, this valve facilitates the essential transition between heating and cooling modes by redirecting discharge gas from the compressor. Designed as a direct OEM replacement part, the 49W64 is electrically and mechanically identical to Lennox 49W6401, ensuring seamless integration without the need for field modifications to the mounting bracket or 24-volt control wiring. This assembly is built to withstand high-pressure differentials typical of R-410A systems, providing the reliable shifting performance necessary to prevent compressor slugging or mode-switching failures. For veteran technicians, this valve offers the standard 4-port configuration compatible with a wide range of Lennox XP and LHT series units. Proper installation requires brazing with wet rags to protect internal seals and verifying 24VAC signal from the defrost board to the O-terminal.

• Direct OEM Compatibility: Verified as a 1:1 replacement for Lennox 49W6401, maintaining factory specifications for port alignment.
• Refined Switching Logic: Optimized for 24V heat pump systems, ensuring the slide assembly initiates mode changes without sticking.
• High-Pressure Durability: Engineered to handle the rigorous refrigerant flow demands of modern high-efficiency heat pumps.
• Complete Assembly: Includes the reversing valve body and 24-volt solenoid coil for a comprehensive system repair.

• Is the coil included with the 49W64? Yes, this part number typically ships as a complete assembly including the 24V solenoid coil.
• Will this fix a system stuck in cooling mode? If you have 24VAC at the valve but it fails to shift, or if you hear a "hissing" sound indicating internal bypass, replacing the Lennox reversing valve is the standard solution.
• Can I use this with R-22 or R-410A? This component is designed to meet the operating pressures and oil compatibility requirements of Lennox R-410A heat pumps.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.