Lochinvar & A.O. Smith 100208174 Limit Switch

The Lochinvar & A.O. Smith 100208174 Limit Switch is a critical high-limit safety component designed for precise thermal regulation in commercial water heaters and boilers. This Honeywell L6189C2023 equivalent features a manual reset mechanism, ensuring the system remains offline if temperatures exceed safe operating parameters until a technician inspects the unit. With a 5-foot capillary tube, this 100208174 limit switch offers flexible mounting options for remote sensing bulbs, maintaining accurate temperature monitoring within the combustion chamber or heat exchanger. Engineered for compatibility, this part is an exact replacement for HLC2702 and HLC2702K, streamlining HVAC replacement parts procurement for contractors. This immersion-style controller provides reliable circuit interruption, protecting the appliance from overheating during high-fire cycles. Whether performing routine maintenance or emergency boiler repair, using the correct OEM limit switch ensures the system adheres to original safety specifications and maintains operational efficiency.

• Direct OEM Match: Fully compatible with Lochinvar and A.O. Smith systems requiring part numbers 100208174, HLC2702, or HLC2702K.
• Manual Reset Safety: Prevents automatic recycling in an overheat condition, requiring a mechanical reset to resume operation.
• Extended Capillary: The 60-inch (5') capillary allows for remote sensing in complex boiler configurations.
• Technical Reliability: The L6189C series is a professional-grade standard for high-limit temperature control in hydronic systems.

What is the difference between 100208174 and HLC2702?
There is no functional difference; these are identical parts. 100208174 is the current manufacturer part number, while HLC2702 and HLC2702K are older or cross-referenced identifiers for the same L6189C2023 limit switch.

Can this switch be used in applications requiring an automatic reset?
No, this is a manual reset safety device. It is specifically designed to lock out the burner circuit when the high-limit setpoint is reached, requiring a manual intervention to ensure the cause of the overheat is addressed.

How do I test a Lochinvar manual reset limit switch?
Check for continuity across the terminals. If the circuit is open and the system temperature is below the setpoint, attempt to press the reset button. If continuity is not restored, the 100208174 switch sensor is likely compromised 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.