Lochinvar & A.O. Smith 100208651 LWCO

The Lochinvar & A.O. Smith 100208651 LWCO is a critical safety component designed for Knight Fire Tube Boiler systems and compatible hydronic applications. This electronic low water cut-off features an auto-reset function and an integrated test button, allowing technicians to verify circuit interruption without draining the system. Utilizing advanced probe-type sensor technology, this 120VAC control effectively monitors water levels to prevent dry firing, ensuring the burner circuit remains open if a low-water condition is detected. Engineered for high-reliability boiler safety control, the 100208651 replaces older Taco LTR models and provides seamless integration with the Smart System control board to mitigate risk of heat exchanger damage.

• Instant Diagnostics: The built-in testable switch allows for rapid verification of the LWCO functionality during annual maintenance or troubleshooting.
• Automatic Recovery: The auto-reset logic ensures the system resumes operation immediately once the NOWL (Normal Operating Water Level) is restored, reducing unnecessary service calls.
• Enhanced Protection: Specifically designed to interface with Lochinvar Knight series, protecting the heat exchanger from thermal stress caused by low-flow or no-water conditions.
• Simplified Installation: Standard threading and 120V power requirements make this a direct-fit OEM replacement for existing low water cut-off sensors.

How do I verify the 100208651 LWCO is functioning?
Depress the test button while the burner is firing. The control should immediately break the circuit and shut down the burner, simulating a low-water state.

Will this LWCO trigger a lockout on my Lochinvar boiler?
The unit itself is auto-reset; however, if the boiler's Smart System detects multiple low water events in a short period, the main control board may require a manual reset to clear the internal fault code.

Is this compatible with steam applications?
This specific model is optimized for hot water boilers and hydronic heating systems. Always check your specific boiler's manual to ensure probe-type sensor compatibility for your pressure rating.

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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.