Johnson Controls T-4100-2 Thermostat

The Johnson Controls T-4100-2 is a professional-grade pneumatic thermostat designed for precision control in low-volume output applications. This reverse acting pneumatic controller utilizes a force-balance mechanism to modulate branch pressure in response to temperature fluctuations, ensuring stable HVAC performance. Engineered for vertical mount installations, the T-4100-2 features a 55 to 85 degree Fahrenheit dial range and is optimized for systems requiring a 13 to 25 psig supply pressure. For accurate signal transmission, this unit operates with a 45 SCIM air consumption when paired with a .007" restrictor, or 25 SCIM with a .005" restrictor. These tight tolerances make it a reliable choice for maintaining setpoints in legacy and modern pneumatic loops. The rugged design minimizes drift, making it a staple for technicians troubleshooting commercial HVAC control systems where durability and repeatable performance are non-negotiable.

• Precision Calibration: Factory-calibrated for a 55-85°F range, allowing for fine-tuned environmental control in demanding zones.
• Optimized Air Consumption: Low volume output design reduces compressor load, ensuring efficient operation across the pneumatic network.
• Universal Integration: Designed for standard vertical mounting, facilitating straightforward replacement of existing T-4100 series thermostats.
• Reverse Acting Logic: Provides reliable signal modulation, increasing branch pressure as the ambient temperature decreases.

What are the restrictor requirements for the T-4100-2?
This thermostat requires an external restrictor for operation. Use a .007" restrictor for a 45 SCIM output or a .005" restrictor for a 25 SCIM output, depending on your system's response requirements.

Can this unit be mounted horizontally?
The T-4100-2 is specifically designed for vertical mounting to ensure proper internal component alignment and accurate temperature sensing across the bi-metal element.

Is the setpoint dial adjustable in the field?
Yes, the 55 to 85°F dial allows for manual setpoint adjustments, though it should be verified with a calibrated thermometer during commissioning to ensure local air patterns are accounted for.

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.