Johnson Controls T-3610-1002 Thermostat

The Johnson Controls T-3610-1002 is a field-proven pneumatic low limit thermostat designed specifically for unit ventilator freeze protection and discharge air temperature control. This proportional direct acting controller utilizes an 18-inch rigid stem element to sense rapid temperature shifts, ensuring the steam or hot water valve opens before the coil reaches freezing conditions. With an element operating range spanning 0 to 270 degrees Fahrenheit and a field-adjustable sensitivity range of .25 to .75 psi per degree, this unit provides the precision required for complex pneumatic logic circuits. Installation is streamlined via the 1/8-inch NPT barbed fitting, compatible with standard 5/32-inch or 1/4-inch OD polytubing. For contractors maintaining legacy school or commercial HVAC systems, this freeze protection thermostat is the standard for preventing costly coil ruptures. The T-3610 series is engineered for durability in high-vibration unit ventilator environments, providing a reliable low limit control solution where electronic sensors may fail.

Key Benefits

• Rigid Stem Reliability: The 18-inch element ensures accurate average temperature sensing across the unit ventilator coil face.
• Precise Calibration: Adjustable sensitivity from .25 to .75 psi allows for fine-tuning the pneumatic control signal to match specific actuator requirements.
• Versatile Mounting: Designed for direct unit ventilator integration with proportional action that prevents cycling and stabilizes discharge air.
• Universal Compatibility: Includes a standard barbed fitting that accommodates dual-size pneumatic tubing for rapid field replacement.

Common Questions

How do I calibrate the sensitivity on the T-3610-1002?
The sensitivity is adjusted by moving the fulcrum along the internal lever arm, allowing the output to change between .25 and .75 psi for every one-degree change in temperature sensed by the 18-inch stem.

Is this unit direct acting or reverse acting?
The T-3610-1002 is a direct acting controller, meaning the output branch pressure increases as the sensed temperature increases, and decreases as the temperature drops toward the low-limit setpoint.

Can this be used for duct mounting?
Yes, while optimized for unit ventilators, the 18-inch rigid stem is suitable for any HVAC application requiring a low-limit freeze stat in a localized air stream.

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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.