T-4002-202 Johnson Controls Thermostat

Overview

The Johnson Controls T-4002-202 is a high-volume output, single-temperature pneumatic room thermostat designed for individual space temperature control in commercial and industrial HVAC systems. This proportional-action controller operates with a reverse-acting mechanism, meaning it alters output pressure in response to room temperature changes, making it ideal for managing heating and cooling zones. Engineered for horizontal wall mounting, it provides fast, stable control of terminal units such as valves, dampers, and mixing boxes, especially in systems with large pneumatic actuators or long tubing runs.

Features

• High-volume output ensures rapid response times for controlled terminal devices
• Reverse-acting control mechanism designed for efficient cooling and heating applications
• Adjustable sensitivity ranges from 0.75 to 4.0 psig/°F to customize system performance
• Integrated pneumatic feedback loop enhances overall control accuracy and stability
• Durable bimetal sensing element provides reliable temperature monitoring
• User-friendly Fahrenheit setpoint dial enables easy adjustments
• Vibration and shock-resistant construction ensures longevity in industrial environments
• Built-in output test connection simplifies field calibration and routine servicing

Specifications

• Control Action: Reverse Acting
• Mounting Orientation: Horizontal
• Setpoint Range: 55 to 85°F (13 to 29°C)
• Factory Sensitivity Setting: Approximately 2.5 psig/°F
• Sensitivity Adjustment Range: 0.75 to 4.0 psig/°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)
• Air Connections: Two 5/32 inch barbed fittings for supply and output tubing
• Ambient Temperature Limits: -20 to 130°F (-29 to 54°C)
• Dimensions: 2.1 inches High x 3.1 inches Wide x 1.8 inches Deep

Applications

The T-4002-202 is widely deployed in commercial and institutional facilities, including schools, hospitals, office complexes, and government buildings where precise pneumatic climate control is vital. It is primarily utilized to manage single-stage heating or cooling setups by modulating terminal equipment like radiators, reheat coils, and mixing boxes. Thanks to its high-volume output capacity, it is especially suited for complex pneumatic configurations featuring long tubing distances or large, high-demand actuators that require swift response times to maintain environmental stability.