air in system?

pauric1

hi, i have a wood pellet boiler and underfloor throughout my house. i have noticed that the pressure on the boiler is down at about 0.5 bar when it used to be around 1 bar. there is also a gurgling and whooshing noise from the pipes behind the boiler so i'm assuming i have air in there.

is there a way to release the air and fill with water again

cheers
P

aujopimur

If there's a safety valve on the boiler you could use this to vent it, if you don't have an air vent, check for vents on the U/F heating manifolds as well.
You will need to locate the fill valve to top up the pressure.

sullzz

aujopimur wrote: »

If there's a safety valve on the boiler you could use this to vent it.

Would you really recommend that , chances are it wont seal again .

heinbloed

If the system was installed correctly then there are automatic air release valves installed (boiler, flow and return groups).
These valves need a minimum of pressure to push out the air.

So simply increase the pressure in the system back to the original 1 bar and see if that pushes the air out.

Billy Bunting

The boiler should have an auto air vent, unfortunetly quite often screwed closed by the installer so quite ineffective, look on the top of the boiler you'll see the pressure relief with a red cap, leave that alone, the AAV is a brass cylinder with a small screw cap on top, unscrew that a full turn.

georgejetson

as well as your boiler. The underfloor hating manifold will have automatic air vents, Make sure the cap on top is open.

see image of automatic air valve with black cap.

http://www.itapfit.com/dati/CatalogoOnLine/upload/img/zoom_itap362.jpg

sullzz

georgejetson wrote: »

as well as your boiler. The underfloor hating manifold will have automatic air vents, Make sure the cap on top is open.

see image of automatic air valve with black cap.

http://www.itapfit.com/dati/CatalogoOnLine/upload/img/zoom_itap362.jpg

The majority of underfloor heating manifolds have manual vents , very rarely come across aav's fitted to them

Dardania

Billy Bunting wrote: »

The boiler should have an auto air vent, unfortunetly quite often screwed closed by the installer so quite ineffective, look on the top of the boiler you'll see the pressure relief with a red cap, leave that alone, the AAV is a brass cylinder with a small screw cap on top, unscrew that a full turn.

And should you leave that screw cap like thay?

Billy Bunting

They have a tendency to leak if you have a dirty system thats basically why some installers leave them closed, but obviously they ain't automatic if done so.

pauric1

thanks for the replies folks, i have been releasing air at the manifolds but one of the cold returns seems to leak quite a bit sometimes when i bleed it, i had been keeping them closed untill now, should i leave them open.

any idea where i'd find the refill valve, the pressure is down about 1/2 bar now so i presume i need to top it up again. looks like there isnt enough pressure to release the air automatically.

thanks again

P

heinbloed

any idea where i'd find the refill valve,....

It should be part of the installation,check the boiler/heating system manual.

Automatic air release valves are left open.

Billy Bunting

heinbloed wrote: »

.

Automatic air release valves are left open.

But they ain't though!!! if you had any practical experience of what your spouting off about you would know that. :rolleyes:

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