tim smith/previous post

[Deleted User]

i'm trying to talk them into the changes, but they swear that the 79 was there before, and.....there are 5 other air vents on the other side of the wall for each loop
according to everthing i find, b&g/ibr/holohan etc, it doesn't make sense to me. and i certainly don't see any sense to feed the cold supply direstly to the return

[Deleted User]

tim smith/previous post

you said; 'Wondering if your sucking air on #79 there?'

what made you suspect that, and how would it happen?
as in, what would be the reason for a pressure differential to cause the 79 to suck air if the system is holding normal pressure?

tim smith

Regarding my concern

With out the expansion tank and fill located at air scoop, I felt that if check in #79 was not working that you could quite readily suck air at that point. Also the changes I suggested will greatly help your air removal to expansion tank if done so I feel. Good luck, Tim

kevin coppinger_15

If you have a....

conventional expansion tank in a hydronic system there must be no other air vents in the system. nay stray air must go back to the tank...other wise the tank will water log sooner....kpc

[Deleted User]

water logged

yep, and that's what happened. but now i'm wondering how air has entered the system and causing no water flow to some zones, and the need to bleed, AGAIN!

tim smith

Water log, relief leaks, fresh water enters!

That's usually the drill.

[Deleted User]

so,

with the fresh water entering, along comes the 'new' air, as in, the O in H2O?

kevin coppinger_15

just plug up...

where the air vent is and see what happens. I bet the problem goes away. kpc