Nordyne 626497R Limit Switch

The Nordyne 626497R Limit Switch is a critical OEM safety component engineered for precise thermal regulation in Nordyne, Miller, and Intertherm heating systems. This L115-20 automatic reset limit switch serves as a primary rollout safety, monitoring the burner assembly for abnormal heat dissipation. When temperatures exceed the 115°F threshold, the switch opens the circuit, interrupting the gas valve power or control signal to prevent equipment damage. Once the temperature drops to the 95°F reset point, the switch automatically closes, allowing for normal operation under safe conditions.

Built with a 3/4" diameter T-O-D 60T11 style disc, this Nordyne gas furnace limit switch is often utilized in high-efficiency and standard air handling applications. Licensed contractors specify the 626497R OEM replacement to ensure total compatibility with factory mounting brackets and electrical harnesses. Unlike manual reset switches, this SPST snap-action electronic switch is designed to cycle automatically, though frequent tripping often signifies underlying issues such as cracked heat exchangers, restricted venting, or improper gas pressure that require immediate technical attention.

• Precise Thermal Calibration: Calibrated to open at 115°F and reset at 95°F (L115-20), matching exact manufacturer specifications for Nordyne mobile home and residential furnaces.
• OEM Integrity: Features standard 1/4" male spade terminals and a 3/4" OD footprint for direct replacement of Nordyne part number 626497.
• Automated System Recovery: Integrated auto-reset functionality reduces nuisance service calls by restoring the circuit once safe operating temperatures are achieved.
• Durable Construction: Engineered to withstand the high-cycle demands of the combustion chamber environment in commercial and industrial settings.
• Enhanced Safety Compliance: Ensures the ignition control board receives accurate feedback regarding rollout conditions to mitigate fire hazards.

What causes this limit switch to trip repeatedly?
Repeated trips usually result from restricted airflow, often caused by a dirty air filter, a failing blower motor, or obstructions in the flue vent. In Nordyne systems, a "rollout" condition indicates flames are not staying within the heat exchanger, which may signal a cracked exchanger or insufficient draft.

Can the 626497R be used to replace a manual reset switch?
No. While physical dimensions may match, you should never replace a manual reset limit with an automatic reset furnace switch unless specified by the manufacturer. Manual resets are designed to force a technician to inspect the system before restart after a critical safety event.

How do I test the continuity of this limit switch?
Using a multimeter set to the Ohms (Ω) scale, disconnect the leads and test the terminals at room temperature. The 626497R rollout switch is normally closed (NC), so it should show near-zero resistance. If the circuit is open at room temperature, the internal disc is likely defective.

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.