I think what I will do is just hook up the stoker motor and convection fan to the coal trol and leave the combustion fan wired to the koker's circuitry (this fan isn't controlled by the coal trol anyways, other than on and off). On my koker, the stoker motor is the last load on the circuit so that will be easy to switch over and the convection fan is also easy to remove from the circuit, it isn't in-line with the rest of the motors (upon delivery of the koker, you have to install the conv. fan and wire it to the existing circuit). This will leave the bonnet limit switch on-line as is and will control the combustion motor if the system hiccups. I may also run a line from the output of the bonnet limit to the coal trol so that the coal feed will get interrupted in an emergency (I would hate to lose unburnt coal to my ash pan even in an emergincy!!
Thanks for all the help!!