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This does look like a valid EMS actuator. It may be that this specific actuator does not perform as expected, we would need an example to diagnose the problem. Before you send an input file that does not work as you expect, try some other actuators to see if they work. For example, the Demand Side Half Loop or Demand Side Branch actuators.

Try actuating the branch for that heating coil and then try actuating the demand side of that plant loop so see if either of these EMS actuators work. Send in an example file of those actuators that do not work and we can look into a solution.

Running the EMSPlantOperation_largeOff example file, these actuators are available:

EnergyManagementSystem:Actuator Available,HEATSYS1,Demand Side Half Loop,On/Off Supervisory,[on/off]
EnergyManagementSystem:Actuator Available,HEATSYS1 DEMAND LOAD BRANCH 5,Demand Side Branch,On/Off Supervisory,[on/off]
EnergyManagementSystem:Actuator Available,PERIMETER_BOT_ZN_3 VAV BOX REHEAT COIL,Plant Component Coil:Heating:Water,On/Off Supervisory,[W]

PlantLoop,
  HeatSys1,                !- Name
  Water,                   !- Fluid Type
  ,                        !- User Defined Fluid Type
  HeatSys1 Loop Operation Scheme List,  !- Plant Equipment Operation Scheme Name
  HeatSys1 Supply Outlet Node,  !- Loop Temperature Setpoint Node Name
  100.0,                   !- Maximum Loop Temperature {C}
  10.0,                    !- Minimum Loop Temperature {C}
  AUTOSIZE,                !- Maximum Loop Flow Rate {m3/s}
  0.0,                     !- Minimum Loop Flow Rate {m3/s}
  AUTOSIZE,                !- Plant Loop Volume {m3}
  HeatSys1 Supply Inlet Node,  !- Plant Side Inlet Node Name
  HeatSys1 Supply Outlet Node,  !- Plant Side Outlet Node Name
  HeatSys1 Supply Branches,!- Plant Side Branch List Name
  HeatSys1 Supply Connectors,  !- Plant Side Connector List Name
  HeatSys1 Demand Inlet Node,  !- Demand Side Inlet Node Name
  HeatSys1 Demand Outlet Node,  !- Demand Side Outlet Node Name
  HeatSys1 Demand Branches,!- Demand Side Branch List Name
  HeatSys1 Demand Connectors,  !- Demand Side Connector List Name
  Optimal;                 !- Load Distribution Scheme

BranchList,
  HeatSys1 Demand Branches,!- Name
  HeatSys1 Demand Inlet Branch,  !- Branch 1 Name
  HeatSys1 Demand Load Branch 1,  !- Branch 2 Name
  HeatSys1 Demand Load Branch 2,  !- Branch 3 Name
  HeatSys1 Demand Load Branch 3,  !- Branch 4 Name
  HeatSys1 Demand Load Branch 4,  !- Branch 5 Name
  HeatSys1 Demand Load Branch 5,  !- Branch 6 Name
  ...,

Branch,
  HeatSys1 Demand Load Branch 5,  !- Name
  ,                        !- Maximum Flow Rate {m3/s}
  ,                        !- Pressure Drop Curve Name
  Coil:Heating:Water,      !- Component 1 Object Type
  Perimeter_bot_ZN_3 VAV Box Reheat Coil,  !- Component 1 Name
  Perimeter_bot_ZN_3 VAV Box Reheat CoilDemand Inlet Node,  !- Component 1 Inlet Node Name
  Perimeter_bot_ZN_3 VAV Box Reheat CoilDemand Outlet Node,  !- Component 1 Outlet Node Name
  Active;                  !- Component 1 Branch Control Type