I have a data center with three systems, 30, 20, and 20 ton Liebert DX units.
I have the room configured with hot aisle, cold aisle. Using this configuration we have been able to turn up the temp set point on the units to 74 degrees. The servers are happy and the system admins and not turning blue anymore.
But, our HVAC tech keeps turning the set points down to 68. When asked they say they run all computer rooms that way. Opinions? It just seems to use more energy and make the system work harder. Also seems to help over dehumidify too.
We even lost the 30 ton unit for a few days and the two 20s kept the servers cool enough even though we were reading 82 degree return air temps.
I know the set points are reading return air...so why set it so low? The unit will run 100% and never stage down.