the only tool needed to troubleshoot a centrifugal chiller...
1. pocket screwdriver (preferably with a South pole magnet on the end)
much more than that and you are doing it wrong.
if you do what Henpeck suggested and watch the chiller tech that shows up, you can learn how they do it with a pocket screwdriver. if they use more tools than that, you may be over-paying them.
"If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best