Johnson Controls T25A-1 Thermostat

The Johnson Controls T25A-1 is a robust line voltage wall thermostat engineered for heavy-duty HVACR applications requiring reliable two-stage temperature control. This controller features dual SPDT switches, allowing for flexible wiring configurations including two-stage heating, two-stage cooling, or integrated one-stage heating and one-stage cooling systems. Built with a vapor-actuated sensing element, the T25A-1 maintains high accuracy across a 40°F to 90°F temperature range, making it ideal for commercial warehouses, garages, and industrial facilities. The knob adjustment provides a tactile interface for precise setpoint management without the need for a selector switch. Designed for efficiency, it operates with a 1-3/4°F heating differential and a 2-1/4°F cooling differential to prevent short-cycling of equipment. For contractors, the heavy-duty industrial thermostat design ensures durability in demanding environments where universal line voltage control is mandatory for high-amperage inductive loads.

Key Benefits for Technicians:

• Dual SPDT Switching: Offers versatile multi-stage HVAC control for various sequence of operations.
• Visible Dial Adjustment: Simplifies field calibration and setpoint verification for industrial temperature control.
• Rugged Enclosure: Built to withstand the rigors of mechanical rooms and high-traffic commercial spaces.
• Broad Compatibility: Supports 120V to 240V AC line voltage applications without requiring external transformers.
• Precision Calibration: Narrow differentials ensure tighter control over ambient conditions and improved system efficiency.

Common Questions:

Can the T25A-1 be used for both heating and cooling simultaneously?
Yes, the dual SPDT configuration allows you to wire the unit for one stage of heating and one stage of cooling, provided they fall within the same setpoint range.

Does this unit require a neutral wire for operation?
As a mechanical line voltage thermostat, it breaks the hot leg of the circuit. Always refer to your specific wiring diagram for the load being switched.

What is the maximum amperage capacity for the switches?
The Johnson Controls T25 series is typically rated for high inductive loads; however, you should always verify the specific FLA (Full Load Amps) and LRA (Locked Rotor Amps) ratings on the nameplate to ensure compliance with the motor or heater load.

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.