Condenser Water is not part of an internal system. It's basically the water that flows through a swamp cooler (although we think of it as "cooling" the air, it actually acts as a heat sink to remove heat from circulated air). The cooling towers you see near power plants and huge HVAC systems have CW trickling down the sides. That's why you see steam plumes in the winter time.
No HAZMAT this time!
See
http://tristate.apogee.net/cool/cfn.asp for a more thorough explanation... if you are REALLY bored.