T-4002-304 Johnson Controls Thermostat

Overview

The Johnson Controls T-4002-304 is a comprehensive pneumatic thermostat conversion kit designed to replace or upgrade existing non-Johnson Controls single-temperature room instruments. This high-volume output, reverse-acting (RA) controller provides a proportional air signal to modulate pneumatic devices like valves and damper actuators in response to temperature changes. The kit is specifically engineered for two-pipe systems and includes a professional beige cover along with all necessary mounting hardware to adapt to various wallbox, mortar joint, or groundplate configurations.

Features

• Reverse acting (RA) pneumatic control logic
• High-volume output for rapid response of controlled devices
• Universal conversion design compatible with brands such as Honeywell, Robertshaw, and Barber-Colman
• Adjustable sensitivity to fine-tune system performance
• Includes a durable beige plastic cover with a single setpoint window
• Vibration and shock-resistant bimetal sensing element
• Flexible mounting options for both horizontal and vertical orientations
• Comprehensive hardware kit including adapter plates, terminal connectors, and tubing couplers

Specifications

• Temperature Control Range: 55 to 85°F (13 to 29°C)
• Supply Pressure: 13 to 25 psig (91 to 175 kPa); 20 psig nominal
• Air Consumption: 20 scim (5.5 mL/s)
• Output Flow Capacity: 400 scim (109 mL/s)
• Sensitivity: Adjustable from 0.75 to 4.0 psig/°F (9 to 50 kPa/°C)
• Air Connections: 5/32 in. barbed fittings for polyethylene tubing
• Maximum Ambient Temperature: 135°F (57°C)
• Dimensions: 2.1 in. H x 3.1 in. W x 1.8 in. D
• Action: Reverse Acting (RA)
• Number of Pipes: 2-pipe configuration

Applications

The T-4002-304 is ideal for commercial and institutional HVAC maintenance and retrofit projects. It is widely used in schools, hospitals, office buildings, and government facilities to provide individual space temperature control. The kit is particularly useful for modernizing older pneumatic systems where existing thermostats from different manufacturers need to be replaced with reliable Johnson Controls technology while maintaining the existing infrastructure.