The Johnson Controls D-9502-8 Positioner is a precision pneumatic accessory engineered for high-accuracy control in terminal unit applications. Specifically designed for integration with D-3153 Series Actuators, this pilot-type positioner ensures linear movement and precise positioning of dampers in response to varying controller signals. It features a 2-12 PSI adjustable starting point and a 3-13 PSI adjustable operating span, providing technicians with the flexibility to calibrate the unit for specific sequential operation requirements or unique system pressures. The hardware includes versatile air connections with 5/32" or 1/4" OD barb fittings to streamline field retrofits and new installations. By utilizing a pneumatic damper actuator positioner, contractors can eliminate hysteresis and overcome friction or air velocity imbalances within the ductwork. This HVAC pneumatic control component is essential for maintaining consistent airflow and optimizing energy efficiency in commercial Johnson Controls pneumatic systems. Key Benefits for Technicians: Precise Actuation: Eliminates actuator positioning errors caused by varying load conditions or friction. Field Adjustability: Allows for fine-tuning of the starting point and operating span to match specific HVAC sequencing logic. Broad Compatibility: Native design for D-3153 series actuators ensures a seamless mechanical interface and rapid installation. Robust Air Interface: Dual-sized barb fittings accommodate standard pneumatic tubing sizes used in legacy and modern pneumatic loops. Common Questions: Can the D-9502-8 be used to sequence multiple dampers? Yes, the adjustable 3-13 PSI span allows you to sequence multiple actuators from a single controller signal by defining specific operating ranges for each unit. How do I select between 5/32" and 1/4" tubing? The positioner includes universal barb fittings designed to accept either 5/32" or 1/4" OD plastic tubing, allowing for direct replacement in existing pneumatic lines without additional adapters. Does this positioner increase the force of the actuator? While it does not increase the physical spring force, it ensures the actuator reaches its full stroke by providing full main air pressure to the bellows until the commanded position is achieved. 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.
