If your chiller has the option of controlling the pumps then the start command should go to the chiller. The start command could be from a time clock or BAS. The chiller then starts condenser and cooler pumps then starts the compressor. It is important to allow the chiller to control the pumps to protect the tubes from freezing.
The old way was often to turn on the chilled water pump then the chilled water flow switch would start the chiller.
Check the installation, operation and or maintenance books for your specific machine, if you don't have them get them! many can be downloaded. Go with the manufactures recommended procedures to CYA!!
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