Hello everyone!
Long time just reading you... now I have an issue.

I have a system with several circuits and multiple compresors on a Parallel system, each liquid line has a subcooler (whose return gets into the Rack's suction manifold) to avoid flashing on a long rise to evaporators, but I noticed that when the subcooler is open the pressure drop on Suction line is very high; when I close the liquid subcooler the suction pressure drop lowers to a reasonable digit.

I calculate this in a Danfoss Cool Selector software, and the theoretically efect should be the opposite, with liquid subcooling there should be lower suction pressure drop.

Any idea why this is happening??