Hey K. So this unit already comes pre-programmed but if you need to change the settings please refer to this link- http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/NC-6220_spm.pdf Page 5 and 6 walk through the steps. You will never need to change the direction of the conveyor unless you want it to spit product back at you untoasted. It cycles the bread through and then out the bottom. If programming isn’t responding or incorrect I suspect a main board issue. I hope this helps!
-Joe