Aaon R70240 Limit Switch

The Aaon R70240 is a critical OEM limit switch designed for precision temperature monitoring in high-performance HVAC systems. This auto limit switch functions as a primary safety control, featuring a specific 95-105F temperature range to prevent heat exchanger or coil overheating. Engineered for reliability in demanding commercial environments, the Aaon R70240 utilizes an automatic reset mechanism—identified as 105 EXP .75 ALS—ensuring the circuit restores connectivity once temperatures stabilize within the safe operating window of 95°F to 105°F.

For technicians servicing Aaon RN series units, including models RN-013, RN-015, and RN-030, this high-limit control is a direct-fit replacement that maintains system integrity. Its robust construction facilitates seamless integration into existing control loops, providing the thermal protection necessary to avoid costly equipment damage. By monitoring discharge air or internal component temperatures, the Aaon R70240 limit switch serves as a fail-safe that communicates directly with the HVAC controller to mitigate high-limit excursions.

Key Benefits

• Precise Thermal Regulation: Specifically calibrated for a 95-105F activation window to ensure optimal safety overhead.
• Automatic Reset Functionality: Eliminates the need for manual intervention, allowing the system to resume regular operation once cooling occurs.
• Broad Compatibility: Engineered for use in Aaon R70240-compatible chillers, air conditioners, and rooftop units.
• Durable Industrial Build: Features a high-integrity design capable of withstanding the high-cycle demands of commercial HVACR applications.

Common Questions

What causes an Aaon R70240 to trip repeatedly?
Frequent tripping usually indicates restricted airflow, such as clogged filters or a failing blower motor, causing temperatures to hit the 105°F limit. Ensure all ductwork is clear before replacing the switch.

Is the R70240 compatible with other HVAC brands?
While technical specs may overlap, this is a genuine Aaon OEM part optimized for their specific control logic. Using it in non-Aaon equipment may lead to calibration discrepancies.

Does this limit switch require manual resetting?
No, this is an auto limit switch. It is designed to automatically reset the circuit once the temperature drops back to the 95°F threshold.

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.

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