If you don't have a good starting point, go through the extended set up instructions for MIN and MAX in the manual. A brief summary of these instructions was posted yesterday, they are :
"..... Then go on the MIN screen (tap MENU button until it shows up) and leave it there so the fire comes down to that setting (wait 30-40 minutes). Then adjust it a point at a time up or down as needed, with 15-20 minutes between adjustments, to dial it in for your particular stove. You should have about 1 inch of burning coal at this idle setting. Then do the same for the MAX setting. For max you're aiming to have the fire full, but no burning off the grate. There should be 1-1.5 inches of ash at the end of the grate for full burn."