It didn't take long to find the right setting, after a little tweaking I have it set at 5 for low fire and 38 for high fire. I saw dimminishing returns for anything higher than 38, at 40 my fire was still staying on the grate but I was not gaining any more heat from it.
This unit keeps the house at 74 degrees 24/7. On the low fire setting my fire is smaller than the original reostat would do on setting #1 and still gives a complete burn of the coal.
I am very pleased to say the least.
Hook it up just like the directions say, don't go through your reostat, just unhook it. Buy a 3 prong cord and some spade terminals, cut it just long enough to hook directly to your feed motor, the convection fan and combustion fan cords should be long enough to plug right in to the coal trol. I mounted mine on the back of the hopper.
The computer cable run's from the thermostat to the coal trol box (24volts I think),not to the feed motor,I don't know how you did that. Remember you are running 110 volts through that wire to the feed motor,I don't think computer cable is rated for that.
When the outside temps are from 0-15 degrees the unit runs 90%+, when the temps get from 20-30 the unit cuts itself back to 20-40%.
I used to leave the reostat set in the 2-3 range and the house temp would go from 69-80 degrees depending on the outside temps, the Wife whinned a lot.
Now she is satisfied with the indoor temp, but now she is whinning about something else.
Maybe these guy's could design a control for that!