Johnson Controls T-4054-2 Thermostat

The Johnson Controls T-4054-2 is a high-volume output pneumatic thermostat designed specifically for energy management in commercial HVAC systems. This reverse acting thermostat provides precision control over heating and cooling cycles with a robust 400 SCIM flow capacity, making it ideal for systems requiring rapid response times and high-capacity air delivery. Operating on a 13 to 25 Psig supply pressure, the unit features dual dials for independent temperature adjustment within a 55 to 85 degree range. The adjustable deadband, configurable between 5 and 12 Psig, ensures efficient changeover and prevents system cycling overlap, optimizing air consumption at a rated 38 SCIM. This Johnson Controls pneumatic control is a standard-tier replacement for maintaining setpoint accuracy in legacy HVAC energy manager setups, providing reliable terminal equipment regulation without the complexity of modern DDC overlays.

Key Benefits for Technicians:

• High Volume Output: 400 SCIM flow capacity ensures fast actuation of large pneumatic dampers and valves.
• Dual Dial Customization: Independent setpoints for heating and cooling cycles allow for precise environmental control.
• Configurable Deadband: Reducing 5 to 12 Psig adjustable range prevents simultaneous heating and cooling, lowering utility costs.
• Energy Manager Integration: Specifically engineered for reverse acting terminal units and high-demand commercial pneumatic loops.
• Field Serviceable Design: Built for rugged longevity in mechanical rooms with standard calibration points.

Common Questions:

What is the primary function of the deadband in the T-4054-2?
The deadband provides a neutral zone between heating and cooling stages, preventing rapid oscillation and ensuring the system only consumes energy when necessary to maintain the setpoint.

Is this thermostat compatible with direct acting systems?
The T-4054-2 is a reverse acting controller. Ensure your actuators and terminal units are configured for reverse pressure logic before installation.

How do I calibrate the dual dials for maximum efficiency?
Use a calibrated pressure gauge at the test port to verify the 13 to 25 Psig supply and adjust the dials to match the building’s thermal load requirements while maintaining the minimum 5 Psig deadband.

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.