| Okay, now I understand xiphias's suggestions a bit better. My expansion tank is attached to a vertical pipe - there is no air eliminator (or air scoop?).
I am sort of telling myself to install an air scoop to the return line of the upstairs zone (prior to the circulator). Should this help? Do I need to add air scoops to all 3 zones? The reason I think of this is that it is much easier to do than moving the circulator around. |