For the KA-6 it's a balance between the adjusting nut and the pin time. I don't remember what turn mine is at but I did not change it since last summer summer and ran all winter. The pin time- 2-3 pins per 30 minutes on mine. That will depend on your draft and how clean your flue/pipes are. I tried one pin every fifteen minutes a month ago and nearly lost the fire. Need to clean the pipes though.