What are the O, AUTO, C positions on the Nylon Valve?

O - Is the open position, when set to this position the valve will be opened and allow water to flow through freely. Auto - Is the automatic position, when set to this position the valve will not allow any water to flow through until it is powered on. C - Is the closed position, when set to this position the valve will not allow any water to flow through even if the valve is connected to a power source and powered on.