The HCC controller has the ability to operate two Hunter valves at one time therefore, allows for more than one program to run at the same time. Only two programs can be allowed to run concurrently. This is a great feature if you have a short water window and the available water to feed multiple stations; however, it could become an issue if the flow of your irrigation system cannot support operating multiple stations at the same time. If you do not have the available water to operate multiple stations at one time, you will need to consider and calculate when each program will finish, or review the total watering time for each program.
Note: It is important to stagger the start times a few minutes apart so the programs will run concurrently. Programs with the exact same start time will result in running only one of the programs. See example below of two: