At 10:18 PM 9/24/01 -0400, ainman@umich.edu wrote:

Can anyone recommend an expert Troubleshooting/Design firm that has extensive experience with Data Center specifici AC issues?

We have a strange problem (probably with the airflow/vents/arrangements) which has machines in various locations dying due to heat, when the ambient temp isn't above 90.

Are you monitoring your line voltage? I've seen "normal" AC lines, in the US, anywhere from 70-140VAC. Modern equipment use switcher power supplies, which draw more current as the voltage goes lower. Heat in the power supply is a function of current squared. So, as the line voltage goes lower, the equipment gets hotter. (paradoxical-seeming, ain't it?) -- Dave's Engineering Page: http://www.dvanhorn.org Got a need to read Bar codes? http://www.barcodechip.com Bi-directional read of UPC-A, UPC-E, EAN-8, EAN-13, JAN, and Bookland, with two or five digit supplemental codes, in an 8 pin chip, with NO external parts.