Read this thread, the guys at CoalTrol explain the Min/Max and FR settings.Coal trol FR dips below MIN setting and soars above MAX.
I guess if you want to run it at max, just bump the temp up 5-10 degree above room temp and let it rip.!
If it never satisfies the temp, it will run full bore, BUT remember, COAL and the COALTROL take time to respond, if you then turn it down, it may take an hour or more to come back down to a normal burn.
The MAX setting can be different on every stove, even if the same model, due to tolerances in the mechanisms, etc....what works for one, may not for another, so you may have to increase or decrease the MAX for Optimum burning, without wasting coal. approx. 1" of ash at FR99 and running full bore, is perfect, you may be above or below the factory setting of MAX=40 to get achieve this. Mine is at 46 I think and have about 1/2"-3/4" of ash, but no hot coals normally will fall off the grate running full output.
I just leave mine at around 68-70 degrees all the time and let the coaltrol maintain the temps.