T-4002-203 Johnson Controls Thermostat

Overview

The Johnson Controls T-4002-203 is a high-volume output, single-temperature pneumatic room thermostat designed for individual space temperature control in HVAC systems. This direct-acting, vertical-mount controller provides a proportional output signal to modulate pneumatic devices like valves and damper actuators in response to local temperature changes. It is engineered for precision and reliability, featuring pneumatic feedback to ensure accurate control and minimal demand on mechanical heating and cooling equipment.

Features

• Direct-acting control with vertical mounting orientation
• High-volume air output for efficient modulation of controlled devices
• Adjustable sensitivities and setpoints for customized environmental control
• Integrated pneumatic feedback mechanism for enhanced sensing accuracy
• Durable, rugged construction resistant to vibration and shock
• Single bimetal sensing element with clear identification labels
• Includes a Fahrenheit dial for user-friendly temperature adjustment

Specifications

• Brand: Johnson Controls
• Model: T-4002-203
• Action Type: Direct Acting
• Mounting: Vertical Wall
• Temperature Control Range: 55 to 85°F (13 to 29°C)
• 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
• Air Connections: Barbed fittings for 5/32 in. O.D. polytubing
• Dimensions: Approximately 2.1 in. H x 3.1 in. W x 1.8 in. D

Applications

• Commercial and institutional HVAC systems requiring pneumatic temperature regulation
• Office buildings, schools, hospitals, and government facilities
• Control of pneumatic valves and damper actuators in heating and cooling applications
• Installations where vertical mounting is required for space or aesthetic consistency
• Retrofit or replacement of existing T-4000 series pneumatic thermostats