Johnson Controls T-4002-201 Thermostat

The Johnson Controls T-4002-201 is a high-performance pneumatic thermostat engineered for individual space temperature control in commercial HVAC systems. This direct acting, single-temperature controller features a horizontal mount configuration and a standard 55-85°F dial range for precise setpoint management. Designed to modulate pneumatic valves and damper actuators, the T-4002-201 provides a proportional output air signal, ensuring efficient system response to local load changes. The unit utilizes a bimetal sensing element with pneumatic feedback for enhanced accuracy and is vibration and shock resistant, making it a reliable choice for mechanical rooms and demanding environments. With a 400 SCIM flow capacity and 20 SCIM air consumption, this thermostat handles high-volume output requirements with ease. It features barbed fittings designed for 5/32" O.D. polytubing, facilitating straightforward installation and integration into existing pneumatic control systems without the need for complex recalibration in most standard heating and cooling applications.

Key Benefits

• High Volume Output: Delivers 400 SCIM flow capacity to effectively drive multiple pneumatic actuators or large valves.
• Precision Calibration: Factory calibrated at 20 PSIG to provide a reliable 8 PSIG output signal when the room temperature matches the dial setting.
• Bimetal Sensing: Durable single bimetal element ensures long-term stability and resistance to mechanical wear in high-traffic commercial spaces.
• Field Adjustable Sensitivity: Allows technicians to fine-tune the proportional band from 0.75 to 4 PSI/°F to match specific zone requirements.
• Simple Connectivity: Features designated Supply (S) and Output (O) air connections with barbed ports for secure 5/32" tubing attachment.

Common Questions

How do I convert this for use with 1/4" tubing?
While the unit features 5/32" barbed fittings, you can easily adapt it to 1/4" polyurethane tubing by using short lengths of 5/32" black tubing as couplers.

Does this model include a cover?
The T-4002-201 is typically sold as the internal thermostat body; decorative covers and faceplates are usually purchased separately to match the specific architectural requirements of the installation.

Is this compatible with reverse acting systems?
No, this specific model is direct acting. For applications requiring an increase in output pressure upon a temperature drop, the T-4002-202 (reverse acting) should be used instead.

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.