The way I understand it is CO-1= ambient (room) temperature (I use 70) TO-1= 45 (time in minutes to CO-2). CO-2= 1925, TO-2=1, CO-3=1925, TO-3=9999. I may have an extra step in there that I don't need but this is what works for me. I BELIEVE that this should take you from 70 degrees to 1925 in 45 minutes, hold for one minute then on to step 3 where you will hold at 1925 for 9999 minutes. I have used other controllers where each step takes you to a temperature and holds for a certain number of minutes then on to the next step. The Auber controller takes you FROM a temperature in each step, in a certain number of minutes, to the target temperature in the next step. Kind of backward thinking in my opinion but that is what we have to work with. Using Auber SYL-2352P