To dehydrate carrots, wash the carrots, peel them and cut off the ends.
I save the carrot peelings and feed them to our chickens and rabbits.
Then cut the carrots into small chunks and place in your dehydrator.
Chicken & Rice Soup mix in a jar). The dehydrator I have used for the past 3 years is an Oster and is priced less than $40. You can by one for yourself here.
Check out my post about dehydrating carrots into carrot "coins".