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Help relocated undersized expansion tank on Weil-McClain gas boiler CG-8 series 12
I am having trouble with relocating an undersized expansion tank on my gas boiler. Currently it has an EX 30 but needs an EX 60 expansion tank that will not fit in current location. Plus I do not believe the expansion tank is supposed to be hooked up there anyways.
The system has 4 zones with the circulators on the return side with bleeder vents on all four returns lines and 4 Taco flow checks on the supply side. The Weil-McClain boiler gives you a 1/2”npt nipple tnext to supply outlet to attch either a Closed Expansion tank to it Or a Air bleeder vent when using a diaphragm style expansion tank. Then I guess the diaphragm expansion tank would go somewhere else?
Currently there is a diaphragm style expansion tank along with an air vent attached to the half-inch nipple so I don’t know if this is okay because I think it’s kinda dead ended? I’m not sure. Plus the ex-60 doesn’t fit so I have to reconfigure something.
So now I’m left wondering do I either mount the bigger tank against the wall and use that same half-inch fitting to pipe it to it with the bleeder vent or do I need to redo the supply header and attach the tank there before the flow checks? And Should I install the tank to some sort of spirovent while I’m redoing it or would the 4 air bleeders on return line be enough. I’ll try to enclose a drawing and pics