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The M847D is a two position, 24 Vac spring return damper actuator designed to operate directly driven zone dampers, used to control air flow in ducts. Honeywell M847D Automobile Parts User Manual actuator designed to operate directly driven zone dampers,. used to control air flow in ducts.User manual for the device Honeywell M847D. Online user manual database. actuator designed to operate directly driven zone dampers,