Johnson Controls T-4002-9009 Pneumatic Thermostat

The Johnson Controls T-4002-9009 Pneumatic Thermostat is a high-volume output single temperature controller specifically designed for facility managers and HVAC technicians who require precise proportional control in commercial settings. Operating on a reverse acting sequence, this thermostat increases its branch line pressure as the ambient temperature decreases, making it ideal for managing heating and cooling applications through 2-pipe pneumatic systems. The horizontal mount configuration and bi-metal sensing element provide high accuracy with a proportional output signal typically ranging from 3 to 15 psi, ensuring seamless modulation of pneumatic valves and damper actuators.

This T-4000 series instrument is factory-calibrated for an 8 psi output at the set point, with an adjustable sensitivity range of 0.75 to 4 psi per degree Fahrenheit. Built with a rugged bimetal sensor, the T-4002-9009 is vibration and shock resistant, maintaining a stable 12 to 30 degrees Celsius set point even in high-traffic mechanical environments. The 5/32 in. barbed fittings allow for direct connection to standard polytubing, facilitating rapid field replacement. Whether you are performing a pneumatic thermostat calibration or a full system retrofit, this unit's 400 SCIM output capacity delivers the air volume necessary for accurate, repeatable HVAC pneumatic control.

• High Volume Output: Delivers 400 SCIM to quickly position large actuators and valves without the need for additional volume boosters.
• Precise Proportional Control: Features pneumatic feedback to minimize hunting and provide a consistent proportional output signal.
• Field Adjustable: Includes accessible set point adjustment and sensitivity sliders to fine-tune HVACR system performance on-site.
• Durable Construction: Designed with a bi-metallic element and element identification labels for long-term reliability in commercial ducting and room environments.

How do I confirm if this is the correct reverse acting model?
In a reverse acting setup like the T-4002-9009, the branch pressure increases when the temperature drops. This is typically used to open a normally open heating valve or close a normally closed cooling damper as the room cools.

What air supply is required for this thermostat?
This unit requires a clean, dry, and oil-free air supply, typically maintained at a nominal 20 psig. Using contaminated air can lead to clogging in the internal restrictors and bimetal assembly.

Can this be mounted in any orientation?
The T-4002-9009 is specifically calibrated for horizontal mount applications. For vertical installations, you must use the corresponding vertical model to ensure the bimetal element and dial alignment remain accurate.

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.