Schneider Electric (Barber Colman) TC-4111 Thermostat

The Schneider Electric (Barber Colman) TC-4111 Thermostat is a heavy-duty remote bulb thermostat designed for precision on-off control of media in ducts, tanks, and liquid lines. This single-stage controller features a single-pole, double-throw (SPDT) snap-action switch, making it a versatile solution for both heating and cooling applications in commercial HVACR systems. With a broad setpoint adjustment range of -40 to 120°F, it provides reliable performance in demanding environments requiring accurate mechanical temperature sensing. The unit is equipped with a 6-foot copper capillary and a 3/8" x 4" liquid-filled copper bulb for rapid response to temperature fluctuations.

For contractors performing retrofits or system maintenance, the TC-4111 serves as the direct replacement for discontinued models such as the HYDK-21B and HYDK-22B. The adjustable temperature differential, which is factory-set at 3°F but field-adjustable up to 16°F, allows for fine-tuning to prevent short-cycling and ensure equipment longevity. Encased in a rugged NEMA 1 enclosure, this 2-position thermostat is engineered to meet the rigorous standards of professional mechanical installations.

• Wide Operating Range: Covers a diverse setpoint span from -40 to 120°F for multi-application utility.
• Durable Sensing Elements: Utilizes a 6' copper capillary and high-sensitivity bulb for accurate media monitoring.
• Field Flexibility: Features an adjustable differential (3 to 16 degrees) to match specific system load requirements.
• Versatile Switching: SPDT contacts support 24-240 VAC applications, suitable for pilot duty or motor loads.
• Seamless Integration: Compact design fits standard single-gang switch boxes for straightforward mounting.

Common Questions

Is the TC-4111 suitable for outdoor temperature sensing?
Yes, the copper sensing bulb and capillary are designed for use in various media, including ducts and liquid lines, and can be used for outdoor sensing when protected by the appropriate NEMA 1 housing for indoor mounting or a weatherproof enclosure for the electrical head.

Can I adjust the differential to prevent rapid cycling?
Yes, while the unit arrives with a factory preset of 3°F, you can adjust the mechanical differential up to 16°F using the internal adjustment screw to optimize cycle rates for your specific equipment.

What electrical loads can the SPDT switch handle?
The snap-action switch is rated for 24V to 240V AC operation. It handles significant inductive loads, typically up to 9.8 Full Load Amps (FLA) at 120V and 8.0 FLA at 240V, along with high pilot duty ratings (up to 360 VA). Always verify your specific motor load against the technical datasheet.

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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.