D-4073-5 Pneumatic Piston Damper Actuator

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.