Description
Johnson Controls T-4002-304 Pneumatic Thermostat Conversion Kit Overview
The Johnson Controls T-4002-304 is a reverse acting pneumatic thermostat conversion kit designed to modernize and restore aging pneumatic HVAC control systems without requiring a full system replacement. Featuring a 55–85°F dial range and a clean beige cover, this kit delivers reliable temperature control performance in commercial building environments where pneumatic systems remain in service.
Key Features
- Reverse acting operation — increases branch pressure as temperature falls, ideal for heating control applications
- 55–85°F dial range for precise temperature setpoint adjustment in occupied commercial spaces
- Conversion kit design allows straightforward upgrade or replacement of existing pneumatic thermostat assemblies
- Beige cover finish blends with standard commercial interior finishes for a professional appearance
- Johnson Controls quality construction engineered for long-term reliability in pneumatic control systems
Pneumatic Thermostat Operation
Pneumatic thermostats use compressed air to modulate HVAC equipment such as valves and damper actuators. In a reverse acting configuration, the branch (output) pressure increases as the space temperature drops below setpoint — making this thermostat well suited for heating valve control, where more heat is called for as the space cools. The T-4002-304 conversion kit simplifies the process of upgrading or replacing a failed pneumatic thermostat while maintaining compatibility with existing pneumatic control infrastructure.
Ideal Applications
- Commercial office buildings with existing pneumatic HVAC control systems
- Hospitals, schools, and institutional facilities utilizing pneumatic controls
- Heating valve and damper actuator control in reverse acting pneumatic loops
- Retrofit and conversion projects replacing obsolete pneumatic thermostats
Product Specifications
- Brand: Johnson Controls
- Model / SKU: T-4002-304
- Action Type: Reverse Acting
- Temperature (Dial) Range: 55–85°F
- Cover Color: Beige
- Control Type: Pneumatic
- Kit Type: Conversion Kit
