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hydraulic separator piping
just wondering "in your opinion" what the correct placement of the expansion tank, water feeder, and boiler side circulator is when using a hydraulic separator. I have searched online and have found all configurations. my experience in the field has shown that these components are almost always on the return side of the boiler circuit between the separator and the boiler return with the expansion tank and feeder on the suction side of the boiler circulator. i assume this is safe but is it best? with conventional piping ie no separator, i generally put my zone circulator(s) on the supply of the boiler just after the expansion tank/feeder. wondering why the hydraulic separator seems to always be reversed in essence by pulling the water through it and pushing it back into the boiler. hope this makes sense. what do you guys think?