Damper Actuator 5-10# UNIV. MTG.
The D-4073 Pneumatic Actuator is a multipurpose positioning device used to accurately position small dampers primarily on unit ventilator, Variable Air Volume (VAV), terminal units, and small ventilating dampers in response to output signals of a pneumatic controller or electro-pneumatic transducer. The actuator is also recommended for use on other air flow control dampers, in interior locations, up to a maximum area of 6.75 square feet for proportional volume control and 11.7 square feet for two position actuation provided that the torque requirements are compatible with the specific application. The D-4073 is a direct replacement for existing D-3073 actuators and a functional replacement for former D-251 actuators.
Features and Benefits
• High Power to Size Ratio - Location in confined spaces
• Glass Reinforced Polymer Housing - Lightweight, corrosion and chemical resistant
• Telescoping Linkage - Fast, flexible installation
• Optional Mounting Kits - Covers any application or replacement of obsolete units
When an 8 to 13 psig spring range is used with proportional control, the damper size is limited to 6.75 square feet maximum. As a two position control, damper size is limited to 11.7 square feet. Three nominal spring ranges are available: 3 to 7 psi, 5 to 10 psi, and 8 to 13 psi. The control air pressure for normal HVAC operation is 0-20 psig. The D-4073 incorporates several internal and external features that add functional flexibility. A 2-way swivel connection on the actuator cylinder head provides non-binding movement. All actuators have a telescoping piston rod for easy linkage of the damper for attachment points up to 8-3/4 inches (222 mm) away from the face of the actuator
A swivel ball joint and slotted crank arm connector are furnished on all actuators for optional methods of linkage to the damper.
Air pressure from a pneumatic controller is applied to the diaphragm of the actuator, which moves the piston against the forces of the internal spring and the load. The external load force shifts the operating range from the nominal spring range. The piston will move to a position where the applied force and the spring plus external forces are in equilibrium. However, with a pilot positioner added, the piston will move to a position proportional to the control signal regardless of the load.
Field repairs can not be made. Unit must be replaced.
Replaces Part Numbers: D-4073-3V-N