Lochinvar & A.O. Smith 100208659 Float Switch

The Lochinvar & A.O. Smith 100208659 Float Switch is a critical safety component designed for high-performance water heaters and commercial boilers. Constructed with a 1 1/4" NPT connection, this SPDT float switch (Single-Pole Double-Throw) serves as a direct replacement for the legacy Lochinvar WTR2080 and 100173706 part numbers. Engineered for precise liquid level control, it facilitates the automatic operation of pumps or alarm circuits to prevent dry-firing or overflow conditions within the combustion chamber or storage tank.

As a veteran-grade HVAC float switch, this unit is built for reliability in harsh hydronic environments. The SPDT internal mechanism allows for versatile wiring configurations, supporting both normally open (NO) and normally closed (NC) circuits depending on the system's logic requirements. Whether you are performing HVAC system diagnostics or a routine boiler maintenance cycle, ensuring the integrity of the water level sensor is paramount to protecting the heat exchanger and maintaining energy-efficient water heating standards across A.O. Smith and Lochinvar platforms.

• Direct OEM Compatibility: Engineered specifically for Lochinvar and A.O. Smith equipment, ensuring a drop-in fit without field modifications.
• Versatile SPDT Logic: Single-pole double-throw design allows for simultaneous pump control and remote alarm notification.
• Robust Construction: Designed to withstand the thermal and chemical demands of commercial boiler duty.
• System Protection: Effectively prevents dry-fire scenarios, extending the operational life of the primary heating elements.
• Standardized Threading: Features a rugged 1 1/4" connection for a secure, leak-proof seal in pressurized systems.

Is this switch compatible with older Lochinvar pool boilers?
Yes, the 100208659 is the current manufacturer-approved replacement for the WTR2080 series often found in CPN 501-751 pool boiler models.

Can I use this for both high-level and low-level cutoffs?
Because this is an SPDT (Single-Pole Double-Throw) switch, it can be wired to either break the circuit on low water (low-level cutoff) or complete a circuit on high water (overflow alarm), depending on which terminals are utilized.

What is the thread size for installation?
This unit utilizes a standard 1 1/4" connection. Always ensure the tapping on the tank or manifold is clean and use appropriate pipe sealant to maintain pressure integrity.

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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.