T-4002-303 Johnson Controls Thermostat

Overview

The Johnson Controls T-4002-303 is a direct-acting pneumatic thermostat conversion kit designed to simplify the upgrade or replacement of existing non-Johnson Controls 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 includes a T-4002-201 thermostat, a beige plastic cover with a thermometer window, and a universal two-pipe conversion assembly, reducing the number of stocked items and simplifying the ordering process for commercial retrofit projects.

Features

• Direct-acting (DA) proportional control for reliable temperature regulation
• High-volume output with pneumatic feedback for rapid actuator response and greater accuracy
• Comprehensive conversion kit includes a T-4002-201 thermostat, beige cover, and universal mounting subplate
• Vibration and shock-resistant bimetal sensing element ensuring long-term operational efficiency
• Adjustable sensitivity slider and setpoint stops to customize control system operation
• Integral output pressure test port for simplified calibration, servicing, and pressure checking
• Universal design with a rotatable bracket allowing for both horizontal and vertical mounting configurations

Specifications

• Temperature Range: 55 to 85°F (13 to 29°C) dial range
• Supply Pressure: 13 to 25 psig (91 to 175 kPa); 20 psig nominal (maximum 25 psi)
• Sensitivity: Adjustable from 0.75 to 4.0 psig/°F (9 to 50 kPa/°C); factory set at 2.5 psig/°F
• Air Consumption: 20 scim (5.5 mL/s)
• Flow Capacity: 400 scim (109 mL/s) output flow capacity
• Air Connections: Barbed fittings designated for 5/32 in. O.D. polytubing
• Dimensions: 2.1 in. H x 3.1 in. W x 1.8 in. D (5.3 x 8.0 x 4.5 cm)
• Weight: 0.4 lb (0.2 kg) for the thermostat unit; total package weight approx. 1.6 lbs
• Factory Calibration: Sends an 8 ± 1 psig output signal at setpoint with a 20 psig supply

Applications

• Commercial and institutional HVAC systems relying on standard pneumatic control systems
• Retrofit and modernization projects replacing existing non-Johnson Controls pneumatic thermostats (such as Honeywell, Barber-Colman, Robertshaw, Landis & Gyr)
• Individual space temperature control in single-stage heating and cooling applications
• Facilities like schools, hospitals, and professional spaces requiring a clean, beige aesthetic with a protected or optional external setpoint adjustment
• Environments requiring high-volume air output to modulate pneumatic valves and damper actuators quickly in response to load changes