Hi
Bleed the rads again and a very small amount of air in two of them

Just one more thing i now have a humming from the pipe work could this be a sign the pump is on the way out?
The noise changes if you slow the pump down or speed it up?

Dave

Just bleed rads again and still getting air in two of them.

Strange not sure what else it could be

Dave

Hi
If i run the pump of the lower speed i dont get much heat in the house and less air in the rad
Turn the pump up and better heat but more air in the rads

Could this be a micro leak pulling air in ?
The change to combined vent and feed has not made much of a change to the air in the rad with the pump set on 2

Any idea's?
Would a leak sealer help?

Dave

Hi
Could this be a fault auto air vent letting in are when CH is on?

Dave

Hi
Bleed again and still air in there
System has had a a leaking rad valve replaced and leak sealer added

What next?

Dave

Hi Dave

Did you get your air in the system resolved as the posts have stopped

Hi No not yet
I have reduced the amount of air but filling the level in the header tank higher
I need to move the header tank higher
But i just haven't had time to do it yet

Dave

Hi Dave

Did you move the header tank higher if so has this sorted your problem, if yes how high have you moved the tank from its original position

Only guessing but I should have thought the vent pipe in the picture and diagram could cause a syphon action, in my system the vent is "h" shape with the top of the vertical open and the leg of the n into the header water; also I'm pretty sure its venting on the hot side; perhaps this is just another method and I am sure The Scruff can pass comment, please.

Hi
Header tank now moved 700mm higher
So time will tell when i get to run it for a few days and see what happens

Dave

Hi
First run with the header tank now in its new home and no air looking good so far
Will check again in a few days after the heating has been used more
Dave

Hi Dave

Have you curred all your problems now,,,,, just by moving the tank 700mm higher

cheers mate...........

Hi
It looks that way
No air in system on the last test
Will know more in time when its run longer but for now its looking like it might be fixed

Dave