Lennox 44L72 Limit Switch

The Lennox 44L72 is a high-precision 100-145F Auto Limit Switch engineered for critical temperature regulation in commercial and residential furnaces. As a veteran technician knows, the secondary limit must respond instantly to airflow restrictions or over-temperature conditions to prevent heat exchanger damage. This Lennox blower limit switch features an automatic reset, opening the circuit when the temperature exceeds 145 degrees Fahrenheit and closing once the plenum cools to 100 degrees Fahrenheit. The 44L72 is functionally equivalent to part number 44L7201, ensuring a direct drop-in replacement for various HVAC platforms. Constructed with a durable bimetal disc and industrial-grade housing, this high limit control switch provides the reliability required for 24/7 HVAC operations. Whether you are performing a seasonal tune-up or an emergency repair, utilizing genuine Lennox furnace parts ensures the safety circuit maintains OEM specifications for air handler and heating unit performance.

Key Benefits

• Precise Thermal Control: Factory-calibrated for an open temperature of 145°F and a reset of 100°F to maintain strict safety margins.
• Universal Application: Compatible with a wide range of Lennox heating equipment; the 44L72 is identical to 44L7201 for easy cross-referencing.
• High Reliability: Features an automatic reset mechanism that eliminates the need for manual intervention after temporary temperature spikes.
• Durable Construction: Built to withstand the harsh thermal cycling environments found within residential and commercial furnace plenums.

Common Questions

Is the 44L72 interchangeable with the 44L7201?
Yes, these two part numbers are identical in form, fit, and function. You can use the Lennox 44L72 seamlessly in any application calling for the 44L7201.

What causes this limit switch to trip frequently?
Repeated tripping usually indicates restricted airflow, often due to a clogged filter, a failing blower motor, or obstructed ductwork. Replacing the switch is standard procedure if the bimetal disc has lost its calibration.

Does this switch require manual resetting?
No, this is an auto-limit switch. It will automatically reset the circuit once the ambient temperature at the sensor drops below 100°F.

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.