Lennox 49L95 Limit Switch

The Lennox 49L95 Limit Switch is a high-precision, OEM replacement part designed for integration into furnace and indoor unit control circuits. This 36T series disc-style switch operates with a normally closed circuit, engineered to provide automatic reset functionality essential for system safety and cycle management. With a fixed thermal profile, the 49L9501 secondary limit provides a cut-out temperature of 125°F on temperature rise and a cut-in temperature of 95°F on temperature drop. This ensures the HVAC high limit control prevents over-temperature conditions by interrupting the burner circuit or blower logic when thresholds are exceeded.

Built for compatibility with a wide range of residential equipment, this switch is a direct fit for Lennox G40UH, G50UH, and G61MPV series furnaces, as well as several Allied Air, Armstrong, and Ducane models. The 36TX21 L125-30F switch features a compact, durable design that simplifies mounting in tight heat exchanger vestibules. Utilizing a genuine Lennox HVAC limit switch helps maintain the original engineering specifications of the unit, ensuring reliable automatic temperature regulation and preventing intermittent nuisance tripping common with off-spec aftermarket alternatives.

• Precise Thermal Calibration: Fixed 125°F open and 95°F close settings offer consistent furnace limit switch protection.
• OEM Compatibility: Replaces part numbers 49L9501, 21104, and L125-30F across Lennox, Allied, and Armstrong brands.
• Automatic Reset Logic: Eliminates the need for manual intervention by resetting the circuit once the plenum cools to 95°F.
• Industrial Build Quality: High-grade disc construction ensures long-term high-limit switch reliability in high-cycle environments.

What causes a Lennox 49L95 limit switch to trip?
Tripping is typically caused by restricted airflow. Check for a dirty air filter, blocked return grilles, or a failing blower motor that is preventing heat dissipation from the heat exchanger.

Is the 49L95 switch interchangeable with other temperature ranges?
No. Limit switches are safety devices calibrated to specific equipment airflow and BTU ratings. Always replace with the exact 125-30F rating to avoid hazardous operating conditions.

How do I verify if this switch is the correct secondary limit for my furnace?
Cross-reference your furnace model number or original part stamping. This part is frequently used as a secondary limit control in G40 and G50 series upflow/horizontal units.

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.