Lennox 56J20 TXV Kit

The Lennox 56J20 TXV Kit is a critical OEM metering device designed for technicians servicing R-22 refrigerant systems with capacities between 3.5 and 5 tons. Engineered to maintain precise superheat control, this thermostatic expansion valve (TXV) adjusts refrigerant flow based on real-time evaporator load, preventing liquid slugging and protecting the compressor. The kit features 3/8-inch inlet and 1/2-inch outlet Chatleff connections and an external equalizer for accurate pressure sensing. Its aluminum construction and 17.5-inch capillary tube ensure responsive performance in high-demand residential or light commercial heat pump and air conditioning applications. By replacing a faulty thermal expansion valve with this genuine Lennox 56J20 (part number LB-85759G), contractors can restore system efficiency, improve cooling capacity, and maintain the operational integrity of older R-22 equipment.

Key Benefits:

• Precise Refrigerant Metering: Automatically adjusts flow to match cooling demand, ensuring the evaporator coil operates at peak efficiency.
• OEM Compatibility: Specifically designed as a direct replacement for Lennox 3.5 to 5 ton units, utilizing standard Chatleff connections for a reliable seal.
• Enhanced System Protection: Maintains optimal superheat to prevent refrigerant flashback, extending the life of the HVAC compressor.
• Durable Infrastructure: Non-bleed design with an integrated check valve, suitable for both straight-cool and heat pump configurations.

Common Questions:

Is the Lennox 56J20 compatible with R-410A systems?
No, this kit is specifically calibrated for R-22 and R-407C applications. Using it with R-410A will lead to incorrect metering due to different pressure-temperature relationships.

Does this TXV kit include the sensing bulb and mounting hardware?
Yes, the 56J20 kit includes the thermostatic valve with a fixed sensing bulb and the necessary components for a standard Lennox HVAC installation.

Can I use this valve on a 3-ton system?
This valve is rated for 3.5 to 5 tons. Installing it on a lower-capacity system may result in over-feeding and hunting, which can compromise cooling performance.

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.