Johnson Controls T-4002-9008 Pneumatic Thermostat

The Johnson Controls T-4002-9008 is a professional-grade direct acting pneumatic thermostat engineered for precise proportional control in commercial HVACR systems. Designed for horizontal mounting, this single temperature controller manages heating and cooling applications by providing a proportional output air signal that modulates terminal equipment in response to localized load changes. Operating within a set point range of 12 to 30 degrees Celsius, this unit utilizes high-sensitivity bi-metal sensing elements to ensure rapid response times and consistent space temperature regulation. The 2-pipe pneumatic control architecture supports a control air pressure range of 3 to 15 psi, with a maximum supply pressure of 25 psi. Built for the rigors of mechanical rooms, the T-4002-9008 features a rugged construction that is both vibration and shock resistant, maintaining calibration integrity in high-traffic environments. This model is an essential component for contractors maintaining legacy pneumatic infrastructure or installing new energy-efficient Johnson Controls T-4000 series pneumatic systems.

• Enhanced System Accuracy: Integrated pneumatic feedback loop significantly reduces offset and improves control stability.
• Field-Adjustable Sensitivity: Technicians can fine-tune the throttling range between 0.75 and 4 psi/°F to match specific zone requirements.
• Simplified Installation: Standard 5/32-inch barbed fittings allow for direct connection to existing poly tubing networks.
• Durable Design: The bimetal element and robust housing are designed to withstand industrial conditions without performance degradation.

What is the difference between direct acting and reverse acting models?
The direct acting T-4002-9008 increases branch line pressure as the room temperature rises. This is typically used to control normally open valves or dampers in cooling applications.

Can I mount this thermostat vertically?
No, this specific model is calibrated and labeled for horizontal mounting. For vertical applications, a different T-4000 series suffix must be selected to ensure the internal components operate correctly relative to gravity.

What air quality is required for this pneumatic controller?
The system must be supplied with clean, dry, and oil-free air to prevent clogging of the internal orifices and maintain the 20 scim air consumption rating.

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.