Johnson Controls D-3246-5100 Damper Actuator

The Johnson Controls D-3246-5100 is a heavy-duty pneumatic damper actuator designed for precise modulation in demanding HVACR environments. Engineered as a direct replacement for the D-251 Number 6 on Trane Centravac chillers, this unit features a robust die-cast aluminum body and a 23.4 sq. in. effective diaphragm area. Operating within an 8-13 psi spring range, it delivers a consistent 6-inch stroke to manage airflow or fluid bypass effectively. This piston-type actuator is built for high-performance service on 4-inch Hi and 5-inch low VF style valves, handling a maximum control air pressure of 25 psi. The assembly includes a factory-spec crankarm and bracket for secure mechanical linkage, utilizing a standard 1/8" NPT barbed fitting. With a low air consumption rate of 2 SCIM, the D-3246-5100 ensures efficient pneumatic control system operation while maintaining the high torque requirements necessary for industrial damper and valve positioning.

• Direct Trane Centravac Compatibility: Drop-in replacement for the legacy D-251 Number 6 actuator, ensuring exact fitment and stroke alignment.
• High-Torque Performance: The large 23.4" diaphragm provides significant force for controlling large-scale dampers and VF style valves.
• Rugged Construction: Die-cast aluminum housing offers superior thermal stability and corrosion resistance compared to plastic alternatives.
• Precise Modulation: The 8-13 psi spring range allows for fine-tuned linear positioning in pneumatic HVAC systems.
• Complete Installation Kit: Ships with essential mounting hardware, including the crankarm and bracket, to reduce field labor time.

How do I confirm if the D-3246-5100 replaces my existing D-251?
This model is the designated service replacement for the D-251 #6 used on Trane Centravac units. Verify your stroke requirements (6") and diaphragm size to ensure mechanical parity.

What is the maximum pilot pressure for this actuator?
The unit is rated for a maximum control air pressure of 25 psi. Exceeding this limit can damage the diaphragm or cause seal failure.

Is this actuator suitable for high-vibration environments?
Yes, the die-cast aluminum construction and secure bracket mounting make it ideal for the high-vibration areas typical of large centrifugal chillers and heavy industrial air handlers.

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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.