4MSU;

     I have a (newer?) 1988 MC670. Has two burners, top & bottom, with the top burner using a higher CFM fan(10hp) than the bottom(7.5hp). On years when the corn comes out drier, I like to keep the top burner at 170-180* This year with the wetter corn, I cranked the heat up to 220-230*. That is hotter than I like for corn quality, but with the bottom burner going, it does not stay in that zone too long. Bottom burner is as low as I can go 120-140*. I was averaging 300-350 wet bu/hr with these settings. Corn was coming out of the fields 23%avg and it comes out of the dryer 16.5-17.5% @120-140*. this dumps into the air system then to the storage bin to cool with the bin fans. On years with 18-20% corn the air system is my bottleneck with the max being about 425-450 dry BPH.