Lochinvar & A.O. Smith 100208179 Limit Switch

The Lochinvar & A.O. Smith 100208179 is a critical safety component designed for high-performance commercial and residential hydronic systems. This 110-230F Auto Limit Switch provides essential boiler high limit protection by monitoring internal temperatures and automatically breaking the electrical circuit if the system exceeds the calibrated threshold. Engineered for heavy-duty applications, this fixed-temperature thermal switch ensures the heating appliance operates within safe parameters, preventing potential equipment damage or hazardous conditions in Lochinvar Power-Fin (PB/PF 502-1302) and A.O. Smith Cyclone water heaters. For service contractors, this part is a direct replacement for HLC2701 and HLC2701K, featuring an automatic reset function that restores system continuity once temperatures drop 10°F below the limit. Utilizing genuine OEM HVAC replacement parts like the 100208179 is vital for maintaining the factory-specified thermal safety limit and ensuring long-term system reliability during peak demand cycles.

• Precise Temperature Control: Fixed 110-230°F range specifically calibrated for high-output commercial boilers and water heaters.
• Automatic Reset Logic: Eliminates the need for manual intervention by restoring operation once the system reaches safe cooling differentials.
• Platform Cross-Compatibility: Fully interchangeable with Lochinvar HLC2701 and HLC2701K models to streamline inventory for service trucks.
• Safety Compliance: Acts as a primary fail-safe against runaway thermal conditions, protecting heat exchangers and venting components.

Is the 100208179 a manual or automatic reset switch?
This model is a 110-230F auto-reset limit switch. It will automatically close the circuit once the water temperature cools down, unlike manual reset limits that require a physical button press after a lockout.

Which boiler models use this high limit switch?
It is primarily utilized in Lochinvar Power-Fin boilers (models 502 through 1302) and various A.O. Smith commercial water heater series where high-limit temperature monitoring is required.

Can I use this to replace a different temperature-rated limit?
No. In professional HVACR servicing, you must always match the specific temperature rating (110-230°F) to the manufacturer’s specifications to ensure the safety circuit trips at the correct point.

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.