Program a cooling segment the same way you program a heating segment. Only instead of entering a higher temperature, enter a lower one.
Heating the kiln at a rate of 9999 leaves the elements turned on, just like turning a switch to High. Cooling at a rate of 9999 turns the elements off. You will not hear the relays clicking during a 9999 rate.
Learn your kiln's natural cooling rate. Programming a cooling rate that is faster than that will result in an error message.
A cooling rate of 9999 puts the kiln into a "free fall," which is the kiln's natural cooling rate. Error codes that appear when the controller cannot heat or cool at a programmed rate are turned off for segments that contain a 9999 rate.