Lennox 24L18 Expansion Valve

The Lennox 24L18 Expansion Valve is a technical-grade R22 thermostatic expansion valve engineered for precision refrigerant metering in legacy residential and light commercial HVAC systems. Functioning as a direct OEM replacement part, this TXV is cross-compatible with several older catalog numbers, as the Lennox 24L18 is identical to 24L1801 and effectively replaces legacy parts 12L40 and 12L4001. Designed with a durable brass body and a sweat-inlet connection, it maintains critical superheat levels to prevent liquid slugging and optimize evaporator efficiency.

For contractors servicing Lennox air conditioner units, this thermal expansion valve ensures stable performance and system longevity by accurately modulating flow based on cooling load. Its robust mechanical assembly is built to withstand high-pressure environments typical of R22 applications, providing a reliable solution for restoring factory-standard pressure drops across the coil. This genuine HVAC expansion valve is a "drop-in" component that eliminates the guesswork associated with aftermarket universal kits.

• Universal Lennox Compatibility: Directly replaces 24L1801, 12L40, and 12L4001 without field modifications.
• R22 Optimized Performance: Calibrated specifically for R22 systems to ensure accurate superheat regulation and cooling output.
• Compressor Protection: Prevents premature compressor failure by mitigating liquid refrigerant carryover from the evaporator.
• Durable Brass Construction: High-grade materials resist corrosion and mechanical wear in demanding HVAC cycles.
• Precision Metering: Enhances system efficiency by adapting to real-time thermal loads at the indoor coil.

Is the 24L18 compatible with newer R410A systems?
No, this specific valve is designed exclusively for R22 refrigerant systems. Using it with R410A will lead to improper metering and potential system damage due to incompatible pressure ratings.

What is the difference between Lennox 24L18 and 24L1801?
The units are technically identical; 24L1801 is simply an older part numbering convention. The 24L18 is the current Lennox catalog designation for this component.

Does this TXV include the sensing bulb?
Yes, as an OEM thermostatic expansion valve, it includes the integrated sensing bulb required to monitor suction line temperature for automatic flow adjustment.

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.