Overview The Johnson Controls T-4002-201 is a high-volume output, single-temperature pneumatic room thermostat designed to provide proportional control of pneumatic valves and damper actuators. It operates by producing a proportional output air signal in response to temperature changes in a space, ensuring efficient individual space temperature control for heating and cooling applications. This model is configured for horizontal mounting and features a direct-acting control mechanism, meaning the output pressure decreases as the room temperature increases. Features High-volume output capacity suitable for modulating multiple controlled devices Pneumatic feedback system for enhanced accuracy and stable control Adjustable sensitivity and setpoint to meet specific system requirements Vibration and shock-resistant construction for durability in commercial environments Bi-metal sensing element for reliable temperature detection Includes a Fahrenheit-scaled dial for easy temperature monitoring Elements and dials are factory calibrated for immediate installation Specifications Action: Direct Acting (DA) Mounting: Horizontal Setpoint Range: 55 to 85 degrees 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) Sensitivity: Adjustable from 0.75 to 4 PSI/F (9 to 50 kPa/C) Air Connections: Two barbed fittings for 5/32 in. O.D. polytubing Ambient Temperature Limits: -20 to 130 degrees F (-29 to 54 degrees C) Dimensions: Approximately 2.1 in. H x 3.1 in. W x 1.8 in. D Applications Commercial HVAC systems in schools, office buildings, and hospitals Industrial space temperature control for heating and cooling equipment Retrofit or replacement of existing pneumatic thermostats in institutional facilities Systems requiring high-volume air output to drive large pneumatic actuators or long tubing runs
