White-Rodgers 3L09-22 Limit Switch

For service technicians requiring a field-ready solution for furnace high-limit protection, the White-Rodgers 3L09-22 Limit Switch delivers industrial-grade thermal regulation. Engineered as a 1/2" bimetal disc limit switch, this component provides critical safety by monitoring internal plenum temperatures. The 3L09-22 limit control is calibrated for a 160°F fixed open temperature and a 140°F fixed close temperature, ensuring precise open on rise switch action to prevent heat exchanger damage or unsafe operating conditions. With a 3.12" insertion length and a specialized board mounted design, it offers a direct fit for various OEM furnace applications. The auto reset functionality ensures the system returns to normal operation once temperatures stabilize within the 20°F differential. This HVAC limit switch is recognized for its high-speed contact separation and long-term reliability in demanding residential and commercial heating systems.

• Precise Thermal Calibration: Fixed 160°F trip and 140°F reset points maintain tight system safety parameters.
• Efficient Response: The 1/2" bimetal disc provides rapid contact separation during over-temperature events.
• Streamlined Installation: Features a 3.12" probe and board-mount configuration for efficient field replacement.
• Automated Operation: Auto-reset logic eliminates the need for manual intervention after the unit cools.

• Is the 3L09-22 compatible with different furnace brands? Yes, this switch is a common replacement in many furnace platforms requiring a 3.12-inch insertion depth and a board-mount footprint. Always verify the temperature ratings on the existing part.
• What does "Open on Rise" mean in this application? This means the switch will break the electrical circuit (shutting down the burner) when the temperature rises to 160°F, protecting the equipment from overheating.
• Can this be used to replace a manual reset switch? No. This is an auto-reset control. For safety reasons, never replace a manual reset rollout switch with an auto-reset limit switch.

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.