Nordyne 626518R Limit Switch

The Nordyne 626518R Limit Switch is a critical OEM replacement part designed for high-limit safety monitoring in Nordyne, Intertherm, and Miller furnaces. This automatic reset limit switch is calibrated to maintain precise thermal boundaries, designated with an L160-50 setting. It features a 160?F opening temperature to protect the heat exchanger from overheating and a 110?F closing temperature, allowing the system to resume normal operation once internal temperatures have stabilized. Engineered for high-limit safety, this switch utilizes a reliable bimetal disc to break the electrical circuit upon temperature rise, preventing potential equipment damage caused by restricted airflow or blower failure.

For contractors servicing mobile home or residential gas furnaces, identifying a faulty furnace limit switch often involves diagnosing short-cycling or a blower fan that runs continuously. The 626518R serves as a direct upgrade for the 626518A and is compatible with various Nortek Global HVAC equipment. Its standard 1/2" OD sensing surface and spade terminal connections facilitate a direct fit during field replacements. Integrating this genuine Nordyne part ensures your repairs meet original equipment specifications for response time and thermal sensitivity.

• Precise Thermal Control: Factory-calibrated 110-160?F range ensures your HVAC system operates within safe thermal limits.
• Automatic Reset Logic: Eliminates the need for manual intervention by automatically resetting the circuit once the plenum cools to 110?F.
• Broad Compatibility: Serves as an OEM replacement for Nordyne, Miller, and Intertherm furnace models, including those requiring part 626518A.
• Enhanced Safety: Acts as a primary rollout limit switch or high-limit control to prevent combustion issues and heat exchanger stress.

How do I test if the Nordyne 626518R is functioning correctly?
Using a multimeter set to continuity, you should read 0.0 ohms across the terminals when the switch is cool (room temperature). If the meter shows infinite resistance or "OL" while the part is cool, the switch has failed in the open position and requires replacement.

What causes this limit switch to trip frequently?
Frequent tripping is typically a symptom of restricted airflow. Check for a clogged furnace filter, blocked supply registers, or a failing blower motor. If the switch trips repeatedly under normal load, it may have weakened over time and should be replaced to ensure system reliability.

Is this switch compatible with other brands?
While primarily designed for Nortek/Nordyne brands like Intertherm and Miller, it can replace any automatic limit switch with a matching L160-50 temperature profile and mounting footprint. Always verify the L-number printed on the side of your existing switch before installation.

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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.