Johnson Controls T-3300-2 Thermostat

The Johnson Controls T-3300-2 is a robust proportional pneumatic thermostat designed for precise temperature regulation in demanding HVAC systems. This dual temperature and dual pressure controller operates as direct acting at 20 psig and reverse acting at 15 psig, ensuring versatile integration into existing pneumatic logic circuits. It features a remote bulb sensing element and remote mounting capabilities, making it ideal for monitoring air or liquid temperatures in restricted or hazardous environments where electronic sensors may fail. The external setpoint adjustment allows for field calibration without housing removal, streamlining maintenance routines for technicians. This pneumatic controller is engineered for high stability and sensitivity, maintaining narrow differential control across complex air handling units and heat exchangers. By utilizing a 1/8 inch NPT air connection, the T-3300-2 integrates seamlessly into legacy and modern Johnson Controls pneumatic systems, providing reliable proportional control without the risk of electromagnetic interference.

Key Benefits for Technicians:

• Dual Action Operation: Functions as direct acting (20 psig) or reverse acting (15 psig) to accommodate various damper and valve configurations.
• Remote Sensing Flexibility: The remote bulb allows for accurate temperature detection in ductwork or tanks while keeping the controller accessible.
• Simplified Field Calibration: Features external setpoint adjustment to reduce downtime during system balancing.
• Rugged Construction: Built for industrial longevity in environments where heavy vibrations or high humidity are present.
• Pneumatic Reliability: Eliminates the need for wiring, providing a spark-free solution for sensitive zones.

Common Questions:

How do you calibrate the T-3300-2 for specific pressure outputs? Calibration is performed via the external setpoint adjustment; technicians should use a calibrated gauge to verify the branch line pressure matches the target setpoint at 15 or 20 psig supply.

Can this thermostat be used for both heating and cooling applications? Yes, the dual pressure and proportional pneumatic logic allow it to switch actions based on supply pressure, making it suitable for year-round climate control.

What is the advantage of the remote bulb over a standard room thermostat? The remote bulb allows the T-3300-2 to monitor medium temperatures directly (liquid or air) while the main unit remains in a protected or convenient location for the operator.

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.