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Please refer to the EnergyPlus EMS documentation on actuators where it says:

Actuators override things inside EnergyPlus whenever the actuator’s Erl variable is set to a value other than “Null.” Null is a special built-in variable used to deactivate an actuator. Once an actuator starts overriding, it will continue to do so until the actuator’s Erl variable is set to Null. You should set the actuators to Null whenever you want the EMS to revert to normal operation.

Thus, you should be able to do this:

    EnergyManagementSystem:Program,
      Fanprogram   
      IF (DayOfWeek ==2),    
        SET FANN=15,      
      ELSE,    
        SET FANN=NULL,      
      ENDIF;