I work on very big VGT's

[Wildcard]

This is a 650 ton York R-134a Chiller that provides AC to a local hospital I take care of.. This one is spun by a 500hp motor. It's on a VSD that controls motor speed and we also vary the veins to control load. We run the surge line and monitor for a surge. The control module creates a 3d map marking where it has surged before so it won't repeat.

She blew an oil oring and I am in the process of transferring the 2600# of refrigerant into the condenser for storage. Will make the repair next week