Johnson Controls T-4002-202 Thermostat

The Johnson Controls T-4002-202 is a high-performance pneumatic thermostat designed for precise space temperature control in commercial and industrial HVAC systems. This reverse acting unit features a horizontal mount configuration and a standard 55-85°F dial range, making it a reliable choice for modulating pneumatic valves and damper actuators. Engineered with a bimetal sensing element, the T-4002-202 provides a proportional output air signal to maintain environmental setpoints with high accuracy. The unit is built for high-volume output applications, ensuring rapid response to load changes within a building automation system (BAS). Featuring barbed fittings for 5/32" O.D. polytubing, this thermostat integrates easily into existing pneumatic networks. For field durability, the T-4002-202 is vibration and shock resistant, operating effectively within a temperature range of -20° to 130°F with a nominal 20 PSIG supply pressure. This HVAC pneumatic controller is a staple for technicians requiring dependable, single-temperature regulation in complex heating and cooling sequences.

Key Benefits:

• Reverse Acting Logic: Increases output pressure as the sensed temperature decreases, essential for specific HVAC sequencing.
• High Volume Output: Features pneumatic feedback and volume amplification for fast, accurate modulation of terminal units.
• Universal Connectivity: Equipped with dual supply and output air connections via 5/32" barbed fittings for streamlined installation.
• Field Adjustable: Sensitivity is adjustable from 0.75 to 4 psig/°F, allowing for site-specific tuning to match system requirements.
• Rugged Reliability: Constructed to meet rigorous commercial standards, ensuring stability in high-traffic mechanical environments.

Common Questions:

What is the maximum supply pressure for the T-4002-202?
This pneumatic thermostat is rated for a maximum operating pressure of 25 psi, with a recommended nominal supply pressure of 20 psi for optimal calibration.

Is this model compatible with 1/4" tubing installations?
Yes; while the unit uses 5/32" barbed fittings, technicians can utilize 5/32" tubing as couplers to bridge the connection to 1/4" polyurethane tubing.

Does the T-4002-202 support vertical mounting?
No, the T-4002-202 is specifically calibrated and labeled for horizontal mounting. For vertical applications, a vertical-specific model from the T-4000 series should be selected to ensure proper dial orientation and internal mechanism alignment.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.