Why does system need to be bled three times a winter?

Joseph_4

I have a customer with a heating system that keeps needing to bleed. Will an auto air vent solve the problem? Why is he getting air?

Robert_25

Air Scoop?

Does the system have an air scoop/separator correctly installed?  If there are float vents already installed, are they functional? 

A neighbor of mine had the same issue last winter after his new boiler was installed.  The installer neglected to install an air separator...

Paul Pollets

Pumping Away!

You should read Pumping Away http://www.heatinghelp.com/products/Books/Books-by-Dan-Holohan/11/100/Pumping-Away-and-other-really-cool-piping-options-for-hydronic-systems



Many boilers were installed with the circulator installed on the return, pumping towards the expansion tank. This creates microbubbles and constant air noise in the radiators. Moving the pump to the supply header, pumping away from the expansion tank and "point of no pressure change" eliminates air problems. Installing an air scoop or Spirovent also helps.