Johnson Controls T-4752-205 Thermostat

The Johnson Controls T-4752-205 is a high-performance pneumatic heating-cooling thermostat engineered for precise proportional control in commercial HVAC systems. This dual-temperature unit operates with a 15 psig reverse acting heating sequence and a 20 psig direct acting cooling sequence, making it a reliable solution for changeover applications. Designed for horizontal mounting, it utilizes a sensitive bimetal element to ensure accurate temperature sensing and stable branch pressure regulation. Professional technicians rely on the T-4752 series for its durability in high-demand environments and its ability to interface seamlessly with existing pneumatic infrastructure. This model requires a separate cover and mounting bracket for complete installation. Whether you are performing a retro-fit or replacing a failed unit, this dual pressure pneumatic controller maintains tight setpoint tolerances to optimize air handling unit efficiency and occupant comfort. Its robust construction minimizes calibration drift, ensuring long-term operational stability in complex pneumatic control systems.

Key Benefits

• Dual-Action Capability: Integrated 15 psig reverse acting and 20 psig direct acting logic for seamless heating/cooling changeover.
• Precise Calibration: Factory-calibrated bimetal element Provides reliable proportional response to temperature fluctuations.
• Flexible Application: Compatible with a wide range of pneumatic actuators and pilot positioners in HVAC control loops.
• Rugged Design: Built to withstand commercial mechanical room conditions while maintaining high-accuracy pneumatic signal output.

Common Questions

How do I configure the changeover pressure for this unit?
The T-4752-205 is fixed for 15 psig and 20 psig supply pressure switching; ensure your main air supply is regulated correctly to trigger the internal logic between heating and cooling modes.

Can this thermostat be mounted vertically?
This specific model is calibrated for horizontal mounting. Installing it vertically may affect the bimetal tension and lead to setpoint inaccuracies.

What accessories are required for a field installation?
This Johnson Controls pneumatic thermostat is sold as the internal mechanism only. You must order the protective cover and the appropriate mounting bracket separately to match your specific wall-box configuration.

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.