Lennox 42W31 TXV

Maintain peak performance in high-efficiency cooling systems with the Lennox 42W31 TXV. This genuine OEM Lennox expansion valve is a precision-engineered thermostatic expansion valve (TXV) specifically designed for R410A refrigerant applications. As the certified replacement for the 42W3101 (and part number 100679-17), this 5-ton expansion valve ensures a direct-fit for residential and light commercial units, including KCA060 and KGA060 series. Featuring a 3/8 x 1/2 ODF mechanical connection and a 30-inch capillary tube, it provides accurate refrigerant metering to the evaporator coil. This valve is essential for maintaining proper superheat levels, which is critical for protecting the compressor from liquid slugging and maximizing the refrigeration cycle efficiency of your HVAC system. When diagnosing refrigerant flow issues or low suction pressure, swapping a restricted or failing valve for this OEM component restores factory-spec stability and temperature control without the need for extensive field modifications.

Key Benefits:

• Broad Compatibility: Direct OEM replacement for Lennox 42W3101 and supports a wide range of 5-ton R410A systems.
• Precision Metering: Accurately modulates refrigerant flow based on heat load to maintain optimal evaporator superheat.
• System Longevity: Helps prevent compressor failure by ensuring only vaporized refrigerant returns through the suction line.
• Simplified Installation: 3/8" x 1/2" ODF braze connections and a 30" capillary tube allow for standard technician placement.
• OEM Reliability: Built to original manufacturer specifications to ensure consistent performance in high-pressure R410A environments.

Common Questions:

Will this TXV fix a high superheat issue?
If you have confirmed proper subcooling at the inlet but are reading high superheat and low suction pressure, the existing valve may be stuck closed or have a lost powerhead charge. Replacing it with the 42W31 often resolves these "starving" evaporator symptoms.

Does this valve replace the 42W3101 exactly?
Yes, the 42W31 is the official successor to part number 42W3101. It maintains the same 5-ton capacity and connection sizes for a seamless swap-out.

Is this compatible with R22 systems?
No, this valve is calibrated specifically for the pressure-temperature characteristics of R410A refrigerant. Using it in an R22 system will result in improper metering and potential system damage.

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.