Johnson Controls T26T-3 Thermostat

The Johnson Controls T26T-3 is a rugged line voltage wall thermostat engineered for high-capacity heating and cooling applications requiring reliable performance without complex electronics. This heavy-duty SPDT controller features a liquid-filled sensing element that ensures rapid response to ambient temperature shifts, making it ideal for industrial HVAC installations and surface-mounted commercial setups. Operating across a 40 to 90?F range, the T26T-3 provides a fixed 3?F heating differential and a 3 to 4?F cooling differential to prevent short-cycling of critical equipment. Designed for versatility, this model is identical to the T26T-3C, offering a straightforward knob adjustment without a selector switch to minimize tampering in high-traffic zones. For technicians replacing older Penn/Johnson Controls thermostats, this unit offers a seamless mechanical crossover, providing a reliable analog thermostat solution for line voltage fans, resistive heaters, and inductive loads in demanding environments.

Key Benefits

• SPDT Heavy Duty Switching: Capable of managing both heating and cooling loads with a single, high-amperage Single Pole Double Throw contact set.
• Universal Application Range: Wide 40?F to 90?F setpoint range covers standard room temperatures and low-limit freeze protection requirements.
• Mechanical Durability: The robust knob-adjust design and liquid-filled bellows offer longevity in line voltage HVAC environments where digital units might fail.
• Consistent Temperature Control: Fixed differentials maintain precise thermal lag, protecting compressors and motors from excessive wear.
• Drop-in Replacement: Fully interchangeable with Johnson Controls T26T-3C models for simplified inventory and fleet maintenance.

Common Questions

Can the T26T-3 handle induction motor loads?
Yes, this heavy-duty thermostat is rated for high induction loads typically found in commercial fan coils and unit heaters, provided they fall within the specified amperage ratings of the SPDT switch.

Is this model compatible with 24V control circuits?
While designed as a line voltage controller for 120V to 277V systems, it can function as a dry contact pilot duty device in low-voltage circuits if required by the wiring schematic.

How does the differential affect equipment operation?
The 3-4 degree differential provides a mechanical deadband that prevents the system from hunting, ensuring the heating or cooling application runs long enough to achieve thermal stability.

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.