Lochinvar & A.O. Smith 100208175 Hi-Limit

Maintain critical safety parameters in your heating systems with the Lochinvar & A.O. Smith 100208175 Hi-Limit. This 200F limit control is engineered to monitor water temperatures in high-output boilers and commercial water heaters, providing a fail-safe mechanical break if temperatures exceed the 200°F threshold. Designed for professional field replacement, this 100208175 high limit switch prevents catastrophic heat exchanger damage by interrupting the burner circuit during an overheat condition. As an OEM-spec component, it offers an exact fit for Lochinvar CWN399PM and CWN500PM models, ensuring seamless integration with existing wiring harnesses. Technicians recognize this part as the functional equivalent to HLC2303 and HLC2303K, making it a versatile HVAC high limit replacement for diverse hydronic applications. The robust construction and calibrated snap-disc response ensure reliable overheat protection in demanding environments, minimizing downtime and maintaining the operational integrity of your Lochinvar or A.O. Smith equipment.

• Precise Thermal Response: Calibrated to trip at exactly 200°F, providing a dependable safety barrier against runaway heating cycles.
• Broad Compatibility: Serves as a direct replacement for obsolete part numbers HLC2303 and HLC2303K.
• OEM Standards: Manufactured to the original specifications of Lochinvar and A.O. Smith for consistent electrical and thermal performance.
• Essential Safety Hardware: Protects the heat exchanger and system plumbing from the effects of restricted airflow or failed primary thermostats.

Common Questions

What causes a high-limit switch like the 100208175 to trip?
Most trips are caused by restricted airflow, sediment buildup in the heat exchanger, or a failing primary operating control. Always verify pump circulation and check for scaling before replacing the limit.

Is the 100208175 a manual or automatic reset control?
This specific model is designed as a safety limit, which typically requires a manual reset or a significant temperature drop to ensure the technician investigates the root cause of the overheat condition.

Can I use this in place of a lower-rated limit switch?
No. You must always match the temperature rating (200F) of the original manufacturer specifications. Installing a higher-rated limit can bypass critical safety margins and lead to system failure.

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.