When looking to find some detailed information about an appliance, Manage My Life is here to help. I suggest you add to the thread of this question and include the full model number of your appliance so that the expert can provide you with a more detailed answer. I am adding a link below in where you can enter your appliance model number and the owners manual will pop up in where you can find some good information to help you with your question. I hope my link is useful.
As a general rule of thumb, you will need to lower the baking temperature 25 degrees and reduce the cooking time by 25% when using that convection feature. For example, if you baked biscuits in your conventional oven for 20 minutes at 400 degrees then you will normally need to bake them for 15 minutes at 375 degrees in the convection mode. Baking times and temperatures may vary slightly. You will need to experiment with those times and temperatures until you are used to the new oven.
That is good information. I just bought that type of oven but my convection fan has a heating element. I that formula the same?
Yes. That formula will be the same for a convection system that has an element on the fan.
We need info on how best to cook a 24 lb. turkey in our new Kenmore Elite double range?
I recommend that you bake it in a shallow, open roasting pan. It should be roasted at 325 degrees for around 4 1/2 hours (5 1/2 hours if it is stuffed). You can check the temperature in the middle of thigh to tell when it is done. That temperature will be around 185 degrees when the bird is ready. Let us know if you need more help.