http://systemcontroltech.com/ The purpose of a decouple loop in a chilled water system is to help the programming decide to stage up another chiller or stage down the chiller. This type of control is generally found on systems with multiple chillers.
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Here are some of the things I keep in my tool bag.
Backpack: http://amzn.to/2tDnYsC
My screwdriver: http://amzn.to/2uPyIDV
Small fuse puller: http://amzn.to/2uPIdDk
Combination fuse puller: http://amzn.to/2vB0dPf
Adjustable wrench: http://amzn.to/2us3akS
USB to Serial converter: http://amzn.to/2vAKHTD
Network cable: http://amzn.to/2vBpJE0
Network switch: http://amzn.to/2eHsIa7
Hex Key set: http://amzn.to/2eHvA6C
Fluke meter: http://amzn.to/2tDaZHj
Fluke temperature meter: http://amzn.to/2tDxnQO
Dell 32 bit laptop: http://amzn.to/2us2Z9n
Serial cable: http://amzn.to/2eHvyf8