Lochinvar & A.O. Smith 100208554 T-Stat

The Lochinvar & A.O. Smith 100208554 T-Stat is a professional-grade Honeywell L6189A2092 aquastat controller designed for high-precision temperature management in commercial and residential hydronic systems. This operating control thermostat features a liquid-filled copper remote bulb and capillary assembly, ensuring a fast thermal response for Lochinvar Copper-Fin CB-CW-CS series boilers, water heaters, and pool heaters. Field-proven for reliability, this component serves as a direct replacement for legacy part numbers TST2701, TST2701K, and 100170625, maintaining identical mounting footprints and electrical specifications to minimize downtime during field service.

Engineered for versatility, the 100208554 thermostat operates within a standard range of 110°F to 230°F, providing SPST switching to break the circuit on temperature rise. As a veteran HVAC technician knows, precise aquastat temperature control is critical for preventing short-cycling and maximizing the thermal efficiency of A.O. Smith water heaters. This OEM Lochinvar replacement part includes the necessary dial backing plate and hardware, making it a drop-in solution for models 495-745 and 985-2065. Its diaphragm-operated snap-acting switch ensures clean contact breaks even under heavy industrial vibration.

• Broad Compatibility: Seamlessly replaces Lochinvar TST2701 and TST2701K in Copper-Fin boilers and water heaters.
• Precision Sensing: Utilizes a 3/16-inch diameter remote bulb for rapid temperature detection and increased control accuracy.
• Industrial Durability: Designed with a compact, rugged housing for reliable operation in demanding mechanical room environments.
• Wide Adjustment Range: Features a 110°F to 230°F setpoint range, suitable for various hydronic and pool heating applications.
• Easy Installation: Standard 1/4-inch male quick-connect terminals and included screws facilitate rapid wire termination and mounting.

Is the 100208554 a direct replacement for the TST2701?
Yes, the A.O. Smith 100208554 is the current OEM replacement for the discontinued TST2701 and TST2701K, sharing the same technical specs and Honeywell L6189A2092 configuration.

Which Lochinvar models use this operating control?
It is primarily used in Lochinvar Copper-Fin models ranging from 495 to 745 and 985 to 2065, including CB, CW, and CS configurations for boilers and heaters.

Does this unit handle high-limit safety functions?
The 100208554 is typically utilized as an operating control; always verify your specific system schematic, as separate high-limit controls (like the TST30010) may also be present.

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.