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Johnson Controls T-3311-1 Valve Thermostat Direct Action 15-20 PSI Reverse External

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Special Price $665.25 Regular Price $738.43
In stock
SKU
T-3311-1
The Johnson Controls T-3311-1 Valve Thermostat is a accurate instrument in HVAC systems that maintains temperature by managing the flow of fluids through valves. This thermostat works with temperatures ranging between 20°F and 150°F and pressures ranging between 15-20 PSI and is vital for maintaining the right heating or cooling conditions in many facilities. It works based on temperature change to function the thermostat closes or opens the valve to increase or decrease the rate of fluid circulation depending on the temperature difference from the set value.
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HVAC Controls & Electrical, Valves
Manufacturer:
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Specifications

  • Type: Valve Thermostat
  • Pressure Range: 15-20 PSI
  • Temperature Range: 20°F-15°F
  • Weight: 2.62lbs

Product Overview:
Regulates HVAC heating and cooling by controlling pneumatic pressure and positioning connected valves in response to temperature requirements. The Johnson Controls T-3311-1 Pneumatic Thermostat And Valve Actuator 15-20 PSI Reverse External is a genuine OEM component that performs temperature regulation through an integrated pneumatic thermostat and mechanical valve actuator.

Temperature Sensing and Pressure Response

The thermostat uses a liquid-filled remote sensing bulb connected through a capillary tube to detect temperature variations. Changes in temperature affect the sensing element and internal control mechanism, producing corresponding pneumatic pressure changes for proportional control operation.

Pneumatic Actuation and Operating Sequence

The integrated actuator converts pneumatic pressure signals into mechanical movement to position the connected valve. The assembly uses a 15 PSI direct-acting and 20 PSI reverse-acting pressure configuration, while its external adjustment mechanism allows changes to the temperature control setting.

Replacement Guidelines:
Replace the Johnson Controls T-3311-1 Pneumatic Thermostat And Valve Actuator 15-20 PSI Reverse External when temperature sensing becomes inaccurate, pneumatic pressure response becomes inconsistent, or the actuator develops mechanical wear that affects valve positioning. Replacement may also be necessary if the sensing bulb, capillary tube, or actuator housing becomes damaged. Have a qualified HVAC technician handle pneumatic testing, inspection, and replacement.

Common Failure Symptoms:

  • Inconsistent room temperature regulation.
  • Delayed pneumatic response to temperature changes.
  • Air leakage around pneumatic connections.
  • Difficulty maintaining the selected temperature setting.
  • Irregular or restricted actuator movement.

Equipment Compatibility:
The Johnson Controls T-3311-1 is designed for pneumatic HVAC control systems using valve-top actuator assemblies in terminal air conditioning applications. Its dual-action pressure configuration supports heating and cooling control arrangements requiring 15 PSI direct-acting and 20 PSI reverse-acting operation.

Technical Specifications:
Brand: Johnson Controls
Part Number: T-3311-1
Component Type: Integral Thermostat and Valve Actuator
Control Type: Pneumatic
Direct Acting Pressure: 15 PSI
Reverse Acting Pressure: 20 PSI

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Product Questions (5)
Customer Questions
How does the remote sensing bulb contribute to the T-3311-1 thermostat operation?

The remote sensing bulb detects temperature changes at its installed location and communicates the thermal response to the thermostat through the capillary tube.

What is the purpose of the external adjustment mechanism?

It provides access to the thermostat's temperature control setting for adjusting the desired operating point.

How does pneumatic pressure affect valve positioning?

Pneumatic pressure acts on the actuator mechanism, producing movement that changes the connected valve position.

Why does this T-3311-1 assembly use both direct and reverse pressure configurations?

The two pressure configurations provide different control responses for heating and cooling sequences within pneumatic HVAC applications.

What should be inspected when the T-3311-1 thermostat responds inconsistently?

Inspect the remote sensing bulb, capillary tube, pneumatic connections, pressure supply, and actuator movement to identify potential sources of improper operation.