The more I think about this, the more it makes sense that Trane has decided that since their published performance figures and efficiencies aren't likely to be field measured, they can go with the higher pressure drop losses and insure positive oil return all the time.....thus reducing in-warranty compressor failures and the like. Maybe Trane is simply trying to make field built-up systems idiot-proof.
Originally posted by icemeister
The second thing that comes to mind is that this guy may actually have purposely called for reduced single risers on all jobs to absolutely insure a constant positive oil return, even when the the single-riser pressure drops might adversely affect system capacity at design conditions. [/B]