Description
The Johnson Controls T-3610-1003 is a pneumatic low limit thermostat engineered for reliable duct air temperature protection in commercial HVAC systems. Featuring an 18-inch rigid stem sensing element and a factory-supplied duct mounting bracket, this thermostat installs directly into ductwork to continuously monitor supply air temperature and guard against freeze conditions or dangerously low air temperatures downstream.
How It Works
Operating on a proportional, direct-acting pneumatic control principle, the T-3610-1003 responds to changes in duct air temperature by modulating its pneumatic output signal. As temperature drops toward the low limit setpoint, the thermostat increases its output signal to drive the appropriate control response — such as closing dampers or opening heating valves — helping protect coils, ductwork, and building occupants from the effects of excessively cold supply air.
Key Features
- Pneumatic, proportional direct-acting control action
- 18-inch rigid stem sensing element for accurate duct temperature sampling
- Includes duct mounting bracket for secure, straightforward installation
- Element operating range: 0° to 270°F for broad application flexibility
- Sensitivity (throttling) range: 0.25 to 0.75 PSI for fine-tuned control response
- 1/8″ NPT barbed fitting compatible with 5/32″ or 1/4″ pneumatic tubing
- Designed for low limit protection in air handling and duct systems
Specifications
- SKU: T-3610-1003
- Brand: Johnson Controls
- Control Type: Pneumatic, Proportional Direct Acting
- Application: Low Limit Duct Thermostat
- Stem Length: 18 inches (rigid)
- Element Operating Range: 0° to 270°F
- Sensitivity Range: 0.25 to 0.75 PSI
- Connection: 1/8″ NPT barbed fitting for 5/32″ or 1/4″ tubing
- Mounting: Duct mounting bracket included
Applications
Ideal for use in commercial and industrial air handling units, mixed-air systems, and supply duct applications where low limit temperature control is required to prevent freeze-up of heating/cooling coils or to maintain minimum supply air temperature setpoints.







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