Johnson Controls T-3300-1 Thermostat

The Johnson Controls T-3300-1 is a high-performance proportional pneumatic thermostat designed for precision temperature control in complex HVACR systems. As a dual temperature dual pressure thermostat, it utilizes a changeover air supply to alternate between setpoints, making it an essential component for seasonal heating and cooling transitions. This remote mount pneumatic controller features a liquid-filled remote bulb element connected via a 42-inch capillary, allowing for accurate air temperature sensing within terminal units while the main control body remains accessible for adjustment. Engineered for versatile field application, it facilitates direct acting control at 15 psig and reverse acting control at 20 psig. The external setpoint adjustment dial ensures that technicians can calibrate and fine-tune system response without dismantling the housing. Built for commercial-grade reliability, the T-3300-1 is the professional choice for maintaining environmental stability through pneumatic modulation of dampers and valves in building automation architectures.

• Dual-Function Modulation: Seamlessly handles both heating and cooling modes using 15/20 psig changeover pressures.
• Remote Sensing Precision: The remote bulb with capillary allows for temperature monitoring in tight or inaccessible terminal air conditioning unit compartments.
• Rugged Pneumatic Logic: Proportional action ensures stable output pressure for smooth actuator movement, preventing system hunting.
• Simplified Calibration: Features external setpoint adjustment for rapid field commissioning and maintenance.
• Versatile Compatibility: Standard 1/4" barbed fittings support common FR polyethylene or copper tubing installations.

How do I switch between heating and cooling modes?
The Johnson Controls T-3300-1 shifts between direct and reverse action automatically based on the main air supply pressure. Typically, 15 psig triggers Direct Acting (DA) mode, while 20 psig engages Reverse Acting (RA) mode.

Can the sensing bulb be mounted away from the controller?
Yes, this remote mount thermostat includes a capillary tube, allowing the sensing bulb to be placed in the return air stream while the adjustment dial is located externally for convenience.

Is this unit compatible with existing pneumatic actuators?
The T-3300-1 is designed to control standard pneumatic actuators for valves and dampers, provided the system operates within its 0 to 25 psi control range.

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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.