Lennox 84L00 Limit Switch

The Lennox 84L00 Limit Switch is a critical OEM replacement part designed for high-precision thermal monitoring in residential and commercial furnaces. Engineered as a 130-160F AUTO limit switch, this SPST (Single Pole Single Throw) control features a 3-inch stilt insertion to provide accurate sensing within the heat exchanger airflow. This component is identical to part number 84L0001 and serves as a direct Lennox furnace high limit replacement, ensuring the system safely opens on rise when temperatures hit the 160°F threshold and resets automatically once the internal plenum temperature drops to 130°F. For veteran techs, this limit control stilt is a standard truck-stock item for troubleshooting overheating HVAC systems where a brown sleeve limit switch is specified. Consistent with original factory specifications, it maintains the precise L160-30F thermal profile required to prevent heat exchanger damage and ensure reliable automatic reset furnace safety operations across compatible Lennox, Armstrong, and Ducane models.

• Direct OEM Compatibility: Verified as 100% identical to 84L0001 for seamless integration into existing Lennox control circuits.
• Precision Thermal Calibration: Factory-set to actuate at 160°F and reset at 130°F, maintaining the exact 30-degree differential required for system safety.
• Heavy-Duty Construction: Features a durable 3" OAL stilt mount and a brown sleeve indicator for rapid identification during field service.
• Broad Application: Engineered for use in Lennox G40, G50, and G60 series furnaces and compatible Allied Air equipment.

Common Questions

Is the 84L00 compatible with the 84L0001?
Yes, the 84L00 is identical to 84L0001. They are functionally and physically the same part, meeting the same Lennox OEM specifications for 130-160F limit controls.

What does 'Open on Rise' mean for this specific switch?
This SPST limit switch is designed to break the electrical circuit (open) when the sensed temperature reaches 160°F, cutting power to the gas valve or heating elements to prevent overheating. It automatically resets (closes) when the temperature cools down to 130°F.

Will this work in place of a 36T series switch?
The Lennox 84L00 often utilizes 36T01B3 or similar 36T construction. As long as the temperature range (L160-30) and the 3-inch insertion length match your existing part, it is the correct technical replacement.

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.