Bottom Kiln Shelf: Rather than placing the bottom kiln shelf directly on the kiln floor, you should use short kiln stilts to prop up the bottom shelf. This will allow for more even and efficient firing of the kiln. Also, using 3 stilts and placing these stilts is a triangular formation helps to more uniformly distribute the weight throughout the kiln shelf and can prolong the life and reduce warping the kiln shelf.
Vacuuming Out the Kiln: It is a good idea to vacuum out your kiln, especially around the elements and kiln floor. Ideally this is done after each firing. Make sure to unplug the kiln prior to vacuuming.
Leave Space Around the Pyrometer: As the pyrometer reads the internal temperature of the kiln, be sure to leave a couple inches clearance around it. For instance, ceramic pieces should not be too close and the kiln shelf should NOT be level with the pyrometer or right above or below it or else the temperature may not read properly.
Servicing Your Kiln: It is a good idea to have your kiln serviced annually to ensure that it is running properly. Many school districts already have it set up for the "kiln guy" to come out each school year or summer. If you suspect that something is not running properly be sure to document it and put in a work order. Better to error on the safe side!
Sensing Rod: Firing at high-fire temperatures will eventually cause the the end of the rod to bend or deteriorate and lead to the rod needing to be replaced! The kiln-sitter is generally only intended for temperatures up to and including Cone 8. Source: http://www.fireright.com/docs/kilnsitter/lt3andk.pdf