The D-4070 Two Stage Pneumatic Actuator is a multipurpose positioning device used to accurately position small dampers primarily on unit ventilators, Variable Air Volumes (VAVs), terminal units, and small ventilating dampers in response to output signals of a pneumatic controller or electro-pneumatic transducer. The D-4070 was specifically designed to provide ASHRAE Cycle II and W control of unit ventilators where a minimum of outdoor air (15 to 50%) is admitted during the heating and ventilating stage and gradually increased to 100%, if needed, during the cooling and ventilating stage. The D-4070 is a direct replacement for existing D-3070 actuators and a functional replacement for older D-255 actuators. Product Specifications BRANDJohnson Controls NEMA RATING1 DISPLAY RANGE0 to 100 Percent RH, Non-Condensing TYPEPercent RH LIMITED WARRANTY YEARS1 DISPLAY SIZE INCHES5/16
