T-4002-303 Johnson Controls Thermostat

Overview

The Johnson Controls T-4002-303 is a direct-acting pneumatic thermostat conversion kit designed to replace most competitor single-temperature room instruments. This high-volume output controller provides precise proportional control of heating and cooling applications by producing a pneumatic output signal in response to space temperature changes. The comprehensive kit simplifies the retrofitting process by including all necessary mounting hardware, a beige cover, and a two-pipe conversion assembly.

Features

• Direct-acting (DA) proportional control
• High-volume output with pneumatic feedback for fast, accurate response
• Complete conversion kit includes T-4002-201 thermostat, beige cover, and mounting subplate
• Vibration and shock-resistant bimetal sensing element
• Adjustable sensitivity and setpoint stops
• Integral output pressure test port for simplified calibration and servicing
• Universal design allows for both horizontal and vertical mounting configurations

Specifications

• Temperature 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 4.0 psig/°F (9 to 50 kPa/°C)
• Air Consumption: 20 scim (5 mL/s)
• 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
• Factory Calibration: 8 psig output at setpoint with 20 psig supply

Applications

• Commercial and institutional HVAC systems
• Retrofit projects replacing non-Johnson Controls pneumatic thermostats (Honeywell, Barber-Colman, Robertshaw, Landis & Gyr)
• Single-stage heating and cooling control
• Environments requiring high-volume air output for rapid actuator response
• Public and professional spaces requiring a clean, beige aesthetic with a protected setpoint adjustment