Johnson Controls T-3111-6 Pneumatic Thermostat

The Johnson Controls T-3111-6 Pneumatic Thermostat is a heavy-duty, direct-acting controller engineered for proportional management of steam or water valves in terminal air conditioning units. As a veteran-preferred valve top mounting thermostat, this unit integrates a high-sensitivity averaging bulb element (8-foot sensing area) to ensure precise environmental regulation by mitigating the effects of air stratification. Designed for "single temperature, single pressure" applications, it operates with a direct-acting (DA) proportional output, increasing branch pressure as the sensed temperature rises. The concealed setpoint adjustment prevents unauthorized tampering in commercial spaces, maintaining system balance as commissioned. This pneumatic valve actuator combination is a robust 100% backward-compatible replacement for the legacy T-3110 series and integrates seamlessly with modern VG7000 Series valves. Built with a die-cast aluminum body and a resilient synthetic rubber diaphragm, the T-3111-6 provides the constant effective diaphragm area necessary for consistent stroke performance across its 30°F to 175°F range.

• Zone Accuracy: Features an 8-foot averaging element that senses across the entire coil face to prevent short-cycling.
• Tamper Resistance: The concealed setpoint adjustment is protected by a snap-on cover and button to maintain design specifications.
• System Compatibility: Engineered for direct mounting on Johnson Controls VG7000 and legacy valves (1/2" to 2" NPT).
• Simplified Installation: Includes a built-in restrictor in the supply air tee, reducing the need for external plumbing components.
• Rugged Construction: Die-cast aluminum and zinc housing withstand the high-temperature environments of terminal units.

Is the T-3111-6 compatible with older Johnson Controls assemblies?
Yes, it is a direct replacement for the T-3110 series. While the T-3111-6 is backward compatible, the older T-3110 cannot be used on newer VG7000 series valves.

How do you calibrate the setpoint on a concealed model?
Calibration requires removing the snap-in button or cover. We recommend using the T-4002-5009 calibration tool to adjust the setpoint dial without damaging the internal flexure lever.

What is the primary application for the averaging bulb?
It is specifically designed for low-limit applications or return air sensing where temperature stratification would cause a standard bulb to provide inaccurate readings.

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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.