Rads need constant bleeding

[MaksimsK]

If the heating was sealed before why sludge?

no one bothered to service it for ages (since Ariston was installed 8-10y), no filter, no chemicals. when we moved in, the bottom of all rads was cold, pump noicy as hell

filling loop

 

[moonlight]

When you let any air out, does it smell odd? hydrogen

 

[SimonG]

Corrosion, hydrogen? Tried igniting the gas as you bleed it. Carefully though

 

[MaksimsK]

When you let any air out, does it smell odd? hydrogen

i would say it smell like chemicals, due system threated with Fernox F1 Express Protector. system was power flushed prior boiler swap.

 

[Stigster]

Check those pump nuts, especially the upstream side, easy to do to eliminate as the source of the problem.

 

[SJB060685]

Are you 100% sure its air and not hydrogen? Hydrogen can form by a number of ways ie. The oxygen content of dissolved air reacting with the iron content of radiators causing hydrogen and rust to form. Hydrogen can also gather when water splits due to galvanic corrosion between two dissimilar metals. It can also form if the PH value of system water is acidic, speeding up the corrosion process.
If you're sure its air then I would check all joints on the negative side of pump, this can draw air in if not installed correctly.

 

[MaksimsK]

Are you 100% sure its air and not hydrogen? Hydrogen can form by a number of ways ie. The oxygen content of dissolved air reacting with the iron content of radiators causing hydrogen and rust to form. Hydrogen can also gather when water splits due to galvanic corrosion between two dissimilar metals. It can also form if the PH value of system water is acidic, speeding up the corrosion process.
If you're sure its air then I would check all joints on the negative side of pump, this can draw air in if not installed correctly.

I'm really lacking experience on this and can't be 100% it's not hydrogen. like previously mentioned - light up to check?
can't see the reason why it should be hydrogen if the system was power flushed and protected with Fernox F1 Express + New boiler. Shouldn be all old problems cured with that?

PH problem? how do i solve that?

i will do check all joints on rads and pump tomorrow.

also, my main concern is: do the installer should solve this mystery or it goes beyond his work?

 

[SJB060685]

You could purge the gas into an upside down cup and try igniting it yes. Yes usually when the right dosages of correct inhibitor is used you protect the system. PH test kit will allow you to test acidity of the system water, they're relatively cheap and are often used in diagnosing problems like this, although with the inhibitor I suspect it will be ok, was just pointing out any acidity from excess flux etc can speed up galvanic corrosion.
Purge as I said and try igniting, if its hydrogen then you know where to look. If its air then look for any leaks on the suction side of system

 

[MaksimsK]

not sure what to do if its hydrogen. But as I said, I will check all connections on suction side

 

[MaksimsK]

Everything tightened. So far so good.
But the sound in rads still there (

Just realized, air gathering only on one branch.
One branch for kid's bedroom is ok.
The second branch for second kids bedroom and hall - ok
But third with Master, tower rail and kitchen rads - always gathering air.