Utica-Dunkirk 29198 Limit Switch

The Utica-Dunkirk 29198 Limit Switch is a critical high-limit safety control designed for hydronic and forced-air heating systems. Engineered for precision, this L140-20F limit switch features a 140°F opening threshold and a 20°F differential, ensuring the burner cycles off before internal temperatures exceed safe operating parameters. As a professional-grade HVAC high limit control, it utilizes a bimetal disc for snap-action switching, providing rapid circuit interruption and long-term reliability in high-cycle environments. This component is a direct replacement limit switch for several legacy parts, including S1-7680-3791 and OL29198, making it an essential stock item for maintaining Utica and Dunkirk boiler systems. Integrating this OEM boiler replacement part ensures that the system maintains its original safety specifications and operational integrity, preventing heat exchanger damage and system overheating during high-demand periods.

• Precise Thermal Control: Features a fixed 140°F set point with an automatic reset at 120°F for consistent safety monitoring.
• Broad Compatibility: Serves as a versatile replacement for S1-7680-3791 and Dunkirk OL29198 modules.
• Durable Construction: Built with high-grade materials to withstand the ambient heat of furnace and boiler cabinets.
• Simplified Installation: Standard 1/4-inch quick-connect terminals allow for fast field replacement by licensed contractors.

What does the L140-20F designation mean on a limit switch?
The "L" indicates it is a limit control that opens on temperature rise. "140" represents the opening temperature in degrees Fahrenheit, while "20F" denotes the differential, meaning the switch will automatically close (reset) once the temperature drops by 20 degrees to 120°F.

Can I use the 29198 switch in systems not manufactured by Utica or Dunkirk?
While optimized for Utica and Dunkirk equipment, this switch can be used in any application requiring an L140-20F limit switch, provided the electrical ratings (typically 120/240V) and physical mounting requirements are met.

How do I verify if my current limit switch is faulty?
A failed limit switch often results in the burner not firing or the indoor blower running continuously. Technicians should check for continuity across the terminals when the system is cool; no continuity typically indicates a tripped or failed open switch.

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.