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air in heating circuit

 
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gmabes



Joined: 21 Apr 2008
Posts: 1
Location: westlothian

PostPosted: Mon Apr 21, 2008 5:35 pm    Post subject: air in heating circuit Reply with quote

i have a baxi wall hung system boiler heating 6 rads and a towel rail with microbore, and indirectly heating the dom.hot water. the problem is that after draining the system and changing the rads, i have been encountering air building up in the upstairs rads and have bled them several times!! there is a clunking banging sound coming from the cold feed pipe where it joins the flow leaving the boiler and i presume this is the air being drawn, or circulating. i have also taken the bleed valve from the pump and let it run for a while, in hope that this will exclude any air pockets on circulation however the problem still returns. the rads have been upgraded so there is a larger volume of water in the system now, but the boiler is still working within its capabilities. any advice???
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thescruff
Moderator


Joined: 03 May 2003
Posts: 4249
Location: Bath

PostPosted: Mon Apr 21, 2008 9:31 pm    Post subject: Reply with quote

The clunking and banging suggest a circulation problem.

Air in the boiler.

Pump not working is favorite.

Valve not open if you turned any off.

Motorized valves closed, and or auto by-pass closed.

You connected any additional rads into the system wrong and it's bypassing the boiler
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