Johnson Controls T-4516-201 Thermostat

The Johnson Controls T-4516-201 Dual Temperature Thermostat is a high-volume, direct-acting pneumatic controller designed for systems requiring precise day/night or summer/winter changeover capabilities. Engineered for horizontal mounting, this unit features a 400 SCIM flow capacity to handle large branch line loads, ensuring responsive actuation of terminal equipment. Operating on a supply pressure of 13 to 25 psig, the T-4516-201 utilizes dual 55 to 85°F dials for independent setpoint adjustment, allowing for seamless transitions in pneumatic HVAC control systems. With a low air consumption rate of 20 SCIM, it maintains system efficiency while providing the high-flow output necessary for demanding industrial and commercial applications. This Johnson Controls pneumatic thermostat is a standard-tier solution for professionals restoring or maintaining legacy HVAC automation where reliability and field-proven force-balance technology are required.

• Dual-temperature setpoints allow for distinct heating and cooling or day/night scheduling from a single device.
• 400 SCIM output capacity ensures rapid response times for pneumatic actuators and dampers in high-volume air systems.
• Direct-acting configuration increases branch pressure as the sensed temperature rises, simplifying integration with normally closed valves.
• Low air consumption at 20 SCIM reduces the overall load on the compressor station and air filtration equipment.
• Horizontal mounting design fits standard pneumatic wall boxes, making it an ideal drop-in replacement for existing T-4000 series installations.

What is the required supply pressure for the T-4516-201?
This thermostat operates effectively with a supply pressure range between 13 and 25 psig. Ensure your air station is regulated within these parameters for optimal calibration.

Can this thermostat be used in vertical orientations?
The T-4516-201 is specifically calibrated for horizontal mounting. Installing it vertically may affect the sensitivity of the internal bimetal element and accuracy of the setpoint dials.

How do I change between the two temperature setpoints?
The unit switches setpoints based on the supply pressure provided to the thermostat. Typically, a change in main line pressure (e.g., from 15 psig to 20 psig) triggers the internal switchover mechanism between the two dials.

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.