I work on very big VGT's

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This is the back end of a Trane CVHE450, 450 ton Centrifugal chiller at a School I take care of.
This machine had bearing spalling. It's a refrigerant cooled motor



These chillers utilize R-123 which is low pressure, the machine actually operates in a negative pressure, usually 6" on the evaporator and around 0-2psig on the condenser . You can open a drum of R-123 and the liquid will not boil off until its in the 80's