"Peter R." wrote in
:

3 clicks will give you low intensity, 5 clicks medium, and 7 clicks
high intensity.


The AIM also says to start with the 7 clicks to activate the system, then
you can reduce the intensity with 3 or 5 additional clicks. Every airport I
have ever been to does not need this though. Just 3 or 5 clicks is enough
right off the bat.