How to Fire - General instruction panels for Dura-Fire.

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  • The Knowledgebase is organized into a series of questions and answers having to do mostly with technical troubleshooting and understanding of kilns.
  • Although we write this for our own kilns many of these articles apply to other makes - although L&L takes no responsibility for that.
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How to Fire - General instruction panels for Dura-Fire.
  1. Very Important! Be sure that the adjustments on the kiln-sitter have been properly set. See the kiln-sitter manual for details.
  2. Load the kiln evenly and place a cone pack so it can be seen when looking through the center peephole. A cone pack is a series of three cones set in a line that you look at from the side; your target cone in the center, one cone cooler in front of it, and one cone hotter behind it.
  3. Set the kiln-sitter timer to no more than a half hour longer than the kiln takes to fire. Or set it to maximum time if you are not sure how long it takes. Keep track of how long the firing takes so you can set the timer closer to the real firing time next time.

  4. Set one cone higher than you fire to onto the kiln-sitter tube assembly inside the kiln while holding the kiln-sitter

Additional Actions to Take

  1. On the next firing make up "cone packs" for each thermocouple.
  2. Once the cone packs are positioned on shelves and are visible through the peepholes, fire the kiln to the middle cone's number
  3. Start watching cones near the end of firing.
  4. Keep checking the control display to make sure it does not say CPLt.
  5. If the middle cones did not go down together then immediately note the differences in each thermocouple reading from the one thermocouple the same zone as the first cone that went down. Change the final set point of your program to reflect the difference.
  6. If the kiln is firing too hot then lower the final set point.
  7. If the kiln shut itself off before bending the cones properly, reprogram it and then restart it as quickly as possible. Record the temperature at which the kiln shut down. Stop and restart the kiln. Reprogram the same program to one cone number higher. Do these steps quickly. Watch the middle cones again and note at what temperature the cones properly bend. If they bent while you were programming then just offset the temperature by 5 or 6 degrees. Shut the kiln off once you note that temperature.

Use cone packs in all sections (top, center, bottom) of the kiln and keep records of what happens.

  1. If uneven firing occurs persistently, distribute your load weight more evenly throughout the kiln or to match the firing characteristics of the kiln.
  2. If elements typically fire hot at the top of the kiln put more weight in the top to absorb that heat, and vice versa.
  3. The bottom shelf should be at least 1/2" to 1" above the floor of the kiln.
  4. Badly distributed load weight can also affect the firing rate of the kiln and lead to Error 1.

TIP: The longer square posts can be laid down on their sides to get a perfect amount of space under the bottom shelf.