Rheem-Ruud 47-25349-07 Limit Switch

The Rheem-Ruud 47-25349-07 Limit Switch is a critical safety component designed for high-limit temperature monitoring in residential and commercial furnaces. This OEM furnace limit switch features a single pole single throw (SPST) normally closed configuration, engineered to interrupt the burner circuit if internal plenum temperatures exceed safe operating parameters. With a fixed open temperature of 220 degrees F and a fixed close temperature of 200 degrees F, this auto reset limit switch ensures the blower fan has sufficiently cooled the heat exchanger before resuming a heating cycle. The 3-inch insertion length allows for precise positioning within the airflow stream, while the green/green color coding facilitates rapid identification during field diagnostics. This board mounted limit switch is a direct replacement for various Rheem and Ruud HVAC systems, maintaining system integrity by preventing thermal stress and potential heat exchanger failure.

• Precise Thermal Calibration: Fixed 220°F cut-out and 200°F cut-in points provide reliable over-temperature protection.
• Auto Reset Logic: Automatically restores the circuit once temperatures return to the safe differential, reducing unnecessary service calls.
• OEM Compatibility: Precision-engineered for exact fitment as a Rheem Protech replacement part, ensuring standardized electrical ratings.
• Green/Green Color Identification: Simplifies visual inventory management and ensures the correct thermal profile is installed during maintenance.

Common Questions

What causes a generic limit switch to trip repeatedly?
Frequent tripping usually indicates restricted airflow due to a dirty filter, blocked returns, a failing blower motor, or an oversized furnace. If the 47-25349-07 opens, technicians should verify static pressure and temperature rise across the heat exchanger.

Can I use a limit switch with a different temperature rating?
No. Limit switches are safety devices rated specifically for the furnace's BTU output and airflow design. Installing a switch with a higher opening temperature can lead to heat exchanger damage or fire hazards.

How do I verify if the 47-25349-07 is defective?
Using a multimeter set to continuity, check across the terminals while the system is cool. As a normally closed switch, you should have continuity. If the circuit is open at room temperature, the switch has failed and requires replacement.

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.