Johnson Controls T-3311-1 Pneumatic Thermostat

The Johnson Controls T-3311-1 is a high-performance combination pneumatic thermostat and valve actuator engineered for proportional control of steam or water valves in terminal air conditioning units. Designed as a rugged direct replacement for the T-3310, this unit integrates a liquid-filled remote bulb sensing element and a piston-top valve actuator into a single, die-cast aluminum assembly. It is optimized for dual temperature and dual pressure applications, operating with direct acting logic at 15 psig and reverse acting logic at 20 psig. This allows for automatic seasonal changeover between heating and cooling modes by simply switching the supply air pressure.

Built for field reliability, the T-3311-1 features an external setpoint adjustment dial marked "Cool-Warm," allowing for precise space temperature control based on return air. The unit includes built-in restrictors in the switch stack assembly, which simplifies the install by eliminating the need for external restrictors. It is fully compatible with VG7000 Series valves and fits most Johnson Controls 1/2" through 2" normally open, normally closed, or mixing valves. The robust design includes a die-cast zinc cover and a resilient diaphragm that maintains a constant effective area throughout the entire stroke for consistent proportional control in demanding HVAC pneumatic systems.

• Dual-Action Versatility: Seamlessly switches between direct acting (15 psig) and reverse acting (20 psig) for automatic seasonal heating/cooling changeover.
• Precision Sensing: Equipped with a liquid-filled remote bulb and 42-inch capillary for accurate temperature detection in return air streams.
• Simplified Installation: Features valve top mounting and internal restrictors, reducing peripheral component requirements and labor time.
• Rugged Construction: Utilizes a die-cast aluminum body and yoke with a protective snap-on cover to withstand mechanical room environments.
• Flexible Calibration: Dual setpoints can be calibrated individually or adjusted simultaneously via the external dial for tailored zone control.

Is the T-3311-1 a direct fit for older T-3310 models?
Yes, the T-3311-1 is the professional standard direct replacement for the T-3310 series and is updated for full compatibility with VG7000 Series valves.

What is the required supply air pressure for this thermostat?
This is a dual pressure pneumatic thermostat requiring 15 psig for heating (Direct Acting) and 20 psig for cooling (Reverse Acting) sequences.

Does this unit require an external restrictor?
No. The T-3311-1 is a non-relay type controller with two built-in restrictors, eliminating the need for additional external air flow restriction components.

What valves can this actuator be mounted on?
It is designed to mount directly onto Johnson Controls 1/2 in. through 2 in. valves that typically utilize a V-3000 actuator, including normally open and normally closed configurations.

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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.