Schneider Electric (Barber Colman) TC-2974 Thermostat

The Schneider Electric (Barber Colman) TC-2974 is a professional-grade strap-on changeover thermostat designed for high-accuracy temperature sensing in commercial and industrial hydronic systems. This heavy-duty SPDT thermostat features a snap-acting switch that provides reliable two-position (on/off) control, making it an ideal choice for managing fluid temperatures in pipes up to 4 inches O.D. and ensuring efficient system changeovers. The TC-2974 is a direct replacement for legacy models 2286-421, CYDP-195, and CYDP-196, allowing for seamless integration into existing HVACR infrastructures without extensive re-piping.

Designed for versatile field applications, this industrial pipe thermostat supports a broad setpoint range of 50 to 210°F (10 to 99°C) with a fixed 10°F differential. In unit heater configurations, the common-normally closed (NC) circuit prevents fan operation until the supply media reaches the required temperature, optimizing energy use. Conversely, the common-normally open (NO) circuit is typically utilized for hot water boiler control. Encased in a NEMA 1 steel enclosure with 1/2-inch to 3/4-inch conduit knockouts, the TC-2974 thermostat offers the ruggedized protection required for mechanical rooms. The included mounting strap and spring assembly ensure consistent thermal contact between the bimetal sensing element and the pipe surface for precise thermal response.

Key Benefits

• Direct Interchangeability: Fully compatible and identical in function to 2286-421, CYDP-195, and CYDP-196 models.
• Flexible System Control: The SPDT snap-acting switch manages both heating and cooling changeover logic within a single device.
• Robust Construction: Features a NEMA 1 rated enclosure to protect internal components from dust and debris in mechanical environments.
• Ease of Installation: Designed for surface mounting on pipes up to 4" O.D. using the provided metal strap and spring.
• Wide Operating Range: Adjustable setpoints from 50°F to 210°F accommodate a variety of hydronic and boiler applications.

Common Questions

Can the TC-2974 be used for boiler high-limit control?
Yes, the SPDT switch allows you to wire the common-normally open circuit to shut down or signal a boiler if the pipe temperature exceeds the setpoint.

What pipe sizes are compatible with the included mounting hardware?
The standard metal strap and spring kit provided with the Schneider Electric TC-2974 is sized for pipes with an outside diameter of up to 4 inches.

Does this unit heater thermostat require a specific mounting orientation?
The bimetal sensing mechanism is designed to function accurately when mounted in any position on a clean, smooth pipe surface, though the conduit opening is located on the bottom of the housing for standard wiring layouts.

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.