T-4002-201 Johnson Controls Pneumatic Thermostat

Overview

The Johnson Controls T-4002-201 is a high-volume output, single-temperature pneumatic room thermostat designed to provide proportional control of pneumatic valves and damper actuators. It operates by producing a proportional output air signal in response to temperature changes in a space, ensuring efficient individual space temperature control for heating and cooling applications. This model is configured for horizontal mounting and features a direct-acting control mechanism, meaning the output pressure decreases as the room temperature increases.

Features

• High-volume output capacity suitable for modulating multiple controlled devices
• Pneumatic feedback system for enhanced accuracy and stable control
• Adjustable sensitivity and setpoint to meet specific system requirements
• Vibration and shock-resistant construction for durability in commercial environments
• Bi-metal sensing element for reliable temperature detection
• Includes a Fahrenheit-scaled dial for easy temperature monitoring
• Elements and dials are factory calibrated for immediate installation

Specifications

• Action: Direct Acting (DA)
• Mounting: Horizontal
• Setpoint Range: 55 to 85 degrees F
• Supply Pressure: 13 to 25 PSIG (Nominal 20 PSIG)
• Air Consumption: 20 SCIM (5.5 mL/s)
• Output Flow Capacity: 400 SCIM (109 mL/s)
• Sensitivity: Adjustable from 0.75 to 4 PSI/F (9 to 50 kPa/C)
• Air Connections: Two barbed fittings for 5/32 in. O.D. polytubing
• Ambient Temperature Limits: -20 to 130 degrees F (-29 to 54 degrees C)
• Dimensions: Approximately 2.1 in. H x 3.1 in. W x 1.8 in. D

Applications

• Commercial HVAC systems in schools, office buildings, and hospitals
• Industrial space temperature control for heating and cooling equipment
• Retrofit or replacement of existing pneumatic thermostats in institutional facilities
• Systems requiring high-volume air output to drive large pneumatic actuators or long tubing runs