Hi,

Well Control Strategies just mean the different phases that are possible for an equipment. If you have an equipment with a warm and cold water valve, a PID controller and analog valve, the equipment can have phases. One phase could be Cooling and one could be Heating. The equipment is defined in the SFC and you can define two control strategies: Cooling (CS=1), Heating (CS=2). When the equipment is sent to Batch (SFC configured as EPH), you can use the equipment in the recipe procedure and you can define the same equipment phase to be run in Cooling or Heating. If you have created a setpoint, you can define if the setpoint is valid for one or both control strategies. If you have two setpoints like SPCooling and SPHeating, at the time you define the RPH (Recipe Phase), you can assign CS1 or CS2 and the correct setpoint appears.

The use of control strategies in a equipment module is called: Recipe awareness. 

Now, with the new concept as of V9.0, it is possible to create EPHT and EMT. It is basically possible to remove the phases from the equipment and implement them in the EPHT. When the EPHT is instanced, you connect it to batch and just initiate the phase. You can now design the equipment as EMT without control strategies. From the EPHT level, you can assign setpoints and sent them to the EMT. Basically, the equipment is not tied to a unit anymore, only the phase is and it is possible you create several phases: One EPHT as Cooling, one EPHT as Heating and just control the EMT under it. 

That said, it really depends on the application if you want/need CS to be used. If the equipment can only Heat, you won't need control strategies.