Johnson Controls T-4002-301 Conversion Kit

The Johnson Controls T-4002-301 Conversion Kit is a professional-grade solution designed for upgrading or replacing legacy pneumatic thermostats in commercial HVAC systems. This direct acting kit features a 55-85°F dial range, providing precise setpoint control for single-temperature applications. Engineered for seamless integration into existing pneumatic control loops, the assembly simplifies the transition from older dual-tube or single-tube configurations without requiring extensive piping modifications. The kit includes a high-impact white thermostat cover and the necessary mounting hardware to ensure a clean, stable installation on standard terminal boxes. By maintaining accurate branch line pressure, this conversion kit optimizes actuator response and improves overall system stability. Whether you are performing a thermostat retrofit or correcting calibration drift in a large-scale facility, the T-4002-301 provides the mechanical reliability and sensitivity required for mission-critical environmental control.

• Direct Acting Configuration: Ensures linear increases in branch pressure as the ambient temperature rises, maintaining compatibility with standard pneumatic actuators.
• Broad Setpoint Range: The 55-85°F dial satisfies the comfort requirements of standard commercial office and institutional environments.
• Simplified Field Retrofit: Specifically bundled for HVAC contractors to reduce labor time when converting antiquated T-4002 series controllers.
• Rugged Construction: Built to withstand the rigors of mechanical rooms and high-traffic corridors while maintaining aesthetic consistency with modern interiors.

Is this kit compatible with reverse acting systems?
No, the T-4002-301 is strictly a direct acting controller. Verify your system logic before installation to ensure proper valve or damper fail-safe positioning.

Does the kit include the calibration tool?
Standard kits include the mounting base and cover; however, a pneumatic calibration kit (test gauge and hex key) is recommended for fine-tuning the 0-20 psi output after installation.

Can this replace other brands of pneumatic thermostats?
While designed for Johnson Controls pneumatic systems, it can function as a universal pneumatic conversion for other brands provided the air supply pressure and branch line requirements match the T-4002 specifications.

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.