Armstrong Furnace R110000245 Limit Switch

The Armstrong Furnace R110000245 Limit Switch is a critical safety component designed for high-performance HVAC systems, functioning as an automatic reset limit control. This OEM replacement part features a temperature range of 80-140F, ensuring the furnace operates within safe thermal parameters to prevent heat exchanger overheating. Engineered for Armstrong and Air Ease furnaces, this bimetal disc limit switch monitors internal plenum temperatures, breaking the electrical circuit to the gas valve if the high-limit threshold is exceeded. HVAC contractors trust this part for its precision calibration and SPST normally closed logic. Whether you are performing furnace troubleshooting or a routine system overhaul, using genuine Armstrong furnace parts ensures proper high-limit protection and maintains the original equipment’s efficiency. The R110000245 is essential for resolving furnace short cycling issues related to restricted airflow or failing thermal sensors, providing reliable overheat protection in demanding residential heating applications.

• Precision Thermal Calibration: Features a fixed 80-140F setpoint for accurate high-limit monitoring.
• Automatic Reset Functionality: Restores circuit continuity once the system cools to safe operating levels without manual intervention.
• OEM Compatibility: Specifically engineered for a direct fit in Armstrong, Ducane, and Air Ease heating units.
• System Protection: Safely interrupts the burner cycle to prevent cracked heat exchangers and other thermal damage.

What causes a furnace limit switch to trip frequently?
Repeated tripping is usually caused by restricted airflow from a dirty filter, an undersized return air duct, or a failing blower motor, causing the plenum temperature to exceed the 140F limit.

Can I replace an L140-60 switch with the R110000245?
Yes, provided the temperature specifications and mounting footprint match the manufacturer's wiring diagram and parts list for your specific model.

Does this switch require professional installation?
For safety and to ensure the combustion sequence is correctly maintained, installation by a licensed HVAC technician is highly recommended.

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.