Johnson Controls T-4752-201 Thermostat

The Johnson Controls T-4752-201 is a high-volume output pneumatic heating-cooling thermostat engineered for precise individual space temperature control in commercial HVAC systems. This dual-element controller features automatic changeover logic, operating as 15 psig direct acting for cooling and 20 psig reverse acting for heating sequences. Designed for horizontal mounting, the unit utilizes a sensitive bimetal element to produce a proportional output signal, modulating actuators and valves with a high flow capacity of 400 SCIM. This ensures rapid response times and stable pneumatic logic transitions without the lag found in low-volume alternatives.

Built for the rigors of mechanical rooms and industrial environments, the T-4752-201 includes adjustable sensitivity ranging from 0.75 to 4.0 psig/°F, allowing technicians to fine-tune the throttling range for specific terminal equipment. The dual temperature thermostat architecture supports a setpoint range of 55°F to 85°F, providing the versatility needed for diverse building automation applications. Note that the T-4752-201 requires specific accessories for a complete installation; please ensure the cover and mounting bracket are ordered separately to match your site requirements.

• High Flow Capacity: Delivers 400 SCIM to quickly position large actuators and multiple terminal units.
• Automatic Changeover: Seamlessly switches between 15 psig (DA) and 20 psig (RA) supply pressures for year-round climate control.
• Field Adjustable: Features a 2.5 psig/°F factory setting with field-adjustable sensitivity to eliminate hunting in the pneumatic loop.
• Vibration Resistant: Rugged construction maintains calibration integrity in demanding high-traffic commercial environments.
• Standardized Connections: Uses 5/32" O.D. polytubing barbed fittings for straightforward integration into existing T-4000 series footprints.

How does the automatic changeover function?
The thermostat uses a pressure-sensitive internal switchover mechanism calibrated at 17.5 psig. When the supply pressure is at 15 psig, the direct-acting element is engaged; when the supply pressure increases to 20 psig, the unit automatically shifts to the reverse-acting element.

What is the air consumption of this unit?
The T-4752-201 has a nominal air consumption of 20 SCIM, making it efficient for high-volume output applications while maintaining system-wide pressure stability.

Can I mount this thermostat vertically?
No, the T-4752-201 is specifically calibrated for horizontal mounting. For vertical applications, the T-4752-202 is the designated equivalent model.

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.