T-4002-204 Johnson Controls Thermostat

Overview

The Johnson Controls T-4002-204 is a high-volume output, single-temperature pneumatic room thermostat designed for precise temperature regulation in commercial and industrial HVAC systems. It operates by producing a proportional output air signal to modulate pneumatic controlled devices, such as valves and damper actuators, in response to temperature changes within a space. This vertical-mount, reverse-acting model is engineered for reliability and efficient individual space control in both heating and cooling applications.

Features

• High-volume output with pneumatic feedback for fast, accurate response
• Reverse acting (REV) operation where output pressure increases as temperature increases
• Adjustable sensitivities and setpoints to meet specific control requirements
• Rugged construction designed to be vibration and shock resistant
• Single bimetal sensing element for consistent thermal monitoring
• Element identification labels and an included Fahrenheit dial
• Non-conductive plastic construction allowing for safe testing and maintenance

Specifications

• Action: Reverse Acting
• Mounting: Vertical
• Setpoint Range: 55 to 85°F (13 to 29°C)
• Supply Pressure: 13 to 25 psig (91 to 175 kPa); 20 psig nominal
• Sensitivity: Adjustable from 0.75 to 4 psig/°F (9 to 50 kPa/°C)
• Air Consumption: 20 scim (5.5 mL/s)
• Output Flow Capacity: 400 scim (109 mL/s)
• Air Connections: Barbed fittings for 5/32 in. O.D. polytubing
• Dimensions: 2.1 in. H x 3.1 in. W x 1.8 in. D
• Maximum Ambient Temperature: 135°F (57°C)

Applications

• Commercial office buildings and institutional facilities
• Industrial space temperature control systems
• Schools, hospitals, and government buildings using pneumatic automation
• Control of pneumatic valves and damper actuators in 2-pipe systems
• Retrofit or replacement in existing Johnson Controls T-4000 series installations

T-4002-204 Johnson Controls Thermostat Tech Sheet

T-4002-204 Johnson Controls Thermostat Catalog Page