Lennox 13W52 Expansion Valve

The Lennox 13W52 Expansion Valve (OEM part 100481-04) is a high-precision thermostatic expansion valve (TXV) engineered specifically for R-22 refrigerant systems. As a veteran-grade HVAC replacement part, this Lennox TXV with check valve ensures consistent superheat levels and protects the compressor from liquid slugging by maintaining a tight tolerance on refrigerant flow into the evaporator. Constructed with a 3/8-inch inlet and a 1/2-inch outlet, this R22 expansion valve features an externally equalized design and includes an integrated internal check valve to improve performance in heat pump applications where reverse flow regulation is critical.

Designed for seamless compatibility with Lennox residential and light commercial A-coils, the Lennox 13W52 utilizes a high-quality sensing bulb (approx. 40 inches) to react instantly to suction line temperature changes. Field technicians will appreciate the robust brass body and durable synthetic internals that resist corrosion and prevent premature metering device failure. This thermal expansion valve replacement is essential for restoring SEER ratings and preventing the erratic pressure fluctuations often seen in failing older systems.

Key Benefits

• Optimized Superheat Control: Ensures the evaporator operates at peak efficiency while preventing liquid refrigerant from reaching the compressor.
• Integrated Check Valve: Provides reliable reverse flow prevention, making it a drop-in solution for heat pump systems.
• OEM Precision: Guaranteed Lennox 13W52 dimensions and connection sizes (3/8" x 1/2") facilitate faster installations without field modifications.
• Broad Compatibility: Engineered as an upgraded replacement for older Lennox R22 models and 100481 series valves.
• Long-Term Reliability: Built to withstand the chemical properties of R-22 and POE/Mineral oils, reducing the risk of valve sticking or debris blockages.

Common Questions

Can I use this 13W52 valve in an R-410A system?
No. This valve is calibrated strictly for R-22 refrigerant pressure-temperature characteristics. Using it with R-410A will result in improper metering and potential system damage.

What are the signs that my current Lennox TXV is failing?
Technicians typically look for frost on the evaporator Coil, high superheat readings, or the system "hunting" for stable pressures. If the sensing bulb has lost its charge or the internal needle is stuck, the system will not cool effectively.

Does this kit include the mounting hardware?
Yes, this Lennox expansion valve kit generally includes the 90-degree fitting and the mounting bracket for the sensing bulb to ensure a secure thermal contact with the suction line.

This item is not eligible for free shipping.

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.