Lead/lag for central a/c

Jeremy Dunitz

I need a control that will Lead/lag 2 condensing units on seperate thermostats for a server room. The customer wants the systems to alternate for equal wear and come on in sequence for heavy load conditions. Does anyone know who manufactures such a control?



Thanks in advance for your help.

Techman

lead/lag

part of the answer is, it depends on the mfg of the ac units and will they accept an override of the electronic/remote t'stat controls .with customer approval i simply raise/lower the t'stat settings from year to year for even run time/ware. t'stat  1 @ 70* t'stat 2 @ 72* then switch next year

paul_79

lead lag

what type of cooling units do you have in the data center. Are they true data center cooling units like a liebert, data aire, ect.  that sit in the room or is it a built up system of commercial comfort cooling units.  some of the newer liebet systems can be connected together to do just what you described they call it teamwork mode. If it is a built up system  where the t-stat  is not built in to the unit then you could lead lag on  a 2 stage stat and a lead-lag switch  manually or on a timer