The M847D is a two position, 24 Vac spring return, direct mount actuator designed to operate ARD and ZD zone dampers. FEATURES: Low voltage, spring-return damper actuator Equipped with anti-rotation and drive shaft extensions for direct mounting to 7/16 inch diameter coupling style dampers. Adjustable range stops. Size (inch) - 3-1/2 inch high x 2-3/8 inch wide x 3-3/8 inch deep Motor Mount - Direct connection to damper shaft Motor Type - spring return (damper can be either spring open or spring closed) Wires to Motor - 2 wires Other Motor Information - Two Position, spst;60 in.-oz (423 mNm) at spring returned initial start position; 90 degrees rotation;Spring Return - 10 seconds de-energized, 30 seconds energized Electrical Connections - 2 wires Frequency - 60 Hz Replaces - RDMH damper actuators; RDMZ damper actuators Includes - Anti-rotation and drive shaft extensions bag assembly to be compatible with ZD and ARD dampers Used With - ZD dampers; ARD dampers Used in Trolatemp systems REPLACES HONEYWELL M847D1004