I am validating the result for condenser loop with 4 CoolingTower:TwoSpeed. Looking at the result below plotting the relationship between condenser loop cooling demand rate[kW] and Number of fans operating in condenser loop, I cannot find any condition that 3,5,7 fans are being operated. I expected the operation annotated by red. Does anyone know the logic to select how many fan should operate in CoolingTower:TwoSpeed and how that logic affect to the result shown below?