Description
The Johnson Controls T-3311-1 is a precision-engineered pneumatic thermostat and valve actuator combination designed for demanding commercial HVAC applications. Built to handle dual-temperature and dual-pressure control scenarios, this unit delivers reliable, responsive performance in a single integrated package — simplifying installation and reducing component count.
Key Features
- Direct acting operation at 15 psig for reliable pneumatic control response
- Reverse acting operation at 20 psig for flexible system configuration
- Remote bulb sensing for accurate temperature measurement at the controlled medium
- External setpoint adjustment for easy field calibration without disassembly
- Valve top mounting design for compact, integrated actuator and valve assembly
- Dual temperature capability to accommodate two-season or changeover system requirements
- Dual pressure functionality supporting versatile pneumatic control strategies
Product Overview
The T-3311-1 combines a pneumatic thermostat with a valve actuator in a single valve-top-mounted assembly, making it ideal for hydronic heating and cooling systems where space efficiency and precise control are critical. The remote bulb configuration allows the sensing element to be positioned directly in the fluid stream or space being controlled, ensuring accurate temperature feedback independent of the actuator location.
Direct & Reverse Acting Operation
With direct acting control at 15 psig and reverse acting control at 20 psig, the T-3311-1 accommodates a wide range of pneumatic control system designs. This dual-pressure capability allows contractors and engineers to configure the unit for normally open or normally closed valve operation, providing fail-safe flexibility to match system safety requirements.
Dual Temperature & Dual Pressure Control
The dual temperature and dual pressure design makes the T-3311-1 well suited for two-pipe changeover systems and applications requiring seasonal or simultaneous heating and cooling control. This reduces the need for separate thermostats or additional control devices, streamlining system design and lowering overall installed cost.
External Setpoint Adjustment
The external setpoint adjustment feature allows technicians to fine-tune the control point in the field without removing covers or accessing internal components. This simplifies commissioning and ongoing maintenance, saving time and reducing the risk of errors during adjustment.
Applications
- Commercial hydronic heating and cooling systems
- Two-pipe changeover HVAC systems
- Fan coil unit control with pneumatic actuators
- Air handling unit valve control
- Building automation systems utilizing pneumatic controls
Why Choose the Johnson Controls T-3311-1?
Johnson Controls is a globally recognized leader in building controls and HVAC solutions. The T-3311-1 reflects their commitment to reliability, precision, and ease of installation. By integrating the thermostat and valve actuator into a single valve-top-mounted unit, this product reduces installation complexity and delivers consistent pneumatic control performance across a wide range of commercial applications.
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