Johnson Controls T-3200-1 Pneumatic Thermostat

The Johnson Controls T-3200-1 is a professional-grade pneumatic thermostat designed for high-accuracy proportional control in complex HVAC systems. This single temperature, dual pressure controller is engineered specifically for unit ventilator applications, functioning as a reliable low-limit controller. The T-3200-1 features a liquid-filled averaging element, making it ideal for monitoring duct temperatures where air stratification is a concern. Operating as a direct-acting controller at 15 and 20 psig, its switching mechanism is designed to become inoperative when the supply pressure drops to 11 psig, ensuring system safety and preventing freezing conditions. The remote mounting configuration and concealed setpoint adjustment provide a tamper-resistant solution for commercial environments. This dual pressure pneumatic controller maintains a 56°F low-limit setpoint and utilizes barbed fittings for secure connection to Type FR polyethylene or copper tubing, providing long-term stability for building automation and climate control sequences.

• Averaging Temperature Sensing: The liquid-filled element provides a precise proportional output by averaging ambient air temperature, eliminating localized hot or cold spot errors.
• Engineered Low-Limit Protection: Ideal for unit ventilators, the switching logic ensures the unit acts as an effective freeze-stat or low-limit safety.
• Tamper-Resistant Design: The concealed setpoint adjustment requires a specific calibration tool (T-4002-5009), preventing unauthorized temperature overrides.
• Dual Pressure Versatility: Specifically calibrated for heating and cooling transitions at 15 and 20 psig supply air pressures.

Common Questions

What is the primary application for the T-3200-1?
This controller is most commonly used in 100% outdoor air units or unit ventilators as a low-limit controller to prevent coil freezing by monitoring the mixed air temperature.

How do I calibrate the setpoint on this model?
Because this model features a concealed adjustment for security, you must use calibration tool T-4002-5009. The factory low-limit setpoint is typically established at 56°F.

Which tubing is compatible with the barbed fittings?
It is recommended to use Type "FR" polyethylene tubing. If mounting with copper or "HP" tubing, the barbed fittings must be swapped for compression fittings.

This item is not eligible for free shipping.

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.