OT - Plumbing question
Turbo Mini Forums

I've recently added a radiator in my workshop and a towel rail in my bathroom.

I have a combi boiler (pressurised to around 1.5bar). Until I fitted these I never got air in the rads, and have not needed to blead them for years. However now I keep getting air collecting in the towel rail, (about a pint a week).

I don't appear to have any leaks anyway, as the pressure in only dropping when I bleed the radiators, and there is no damp patches anywhere.

with a pressureised system I assumed it was not possible to suck air in if you had a leak, is this the case? do I have leak or is the air just finding it's way out??

Team www.sheepspeed.com Racing

Did you drain the whole system to plumb in the two extra rads ???

Schrödinger's cat - so which one am I ???

yes buddy, then fillid with cleaner, ran it for a few days, then dumped it all out and then put inhibitor (sp?) in and filled it again

Team www.sheepspeed.com Racing

Strange then, most inhibitors have a good oxygen scavenger in them.

My thoughts were along the lines of dissolved oxygen (harder to get rid of in a closed/pressurised system compared to an open "gravity" system if it's been completely refilled), but the inhibitor usually deals with it.

Schrödinger's cat - so which one am I ???

OOh i just remembered my dad was having a problem like this, I wasnt really listening at the time though

He had to take the back off the boiler and do something, its quite a normal thing to do just to build up the pressure. Once done the rads didnt need bleeding again

Repressurising???
http://britishgas.home-maintenance.info/he...rising-systems/

Edited by Nic on 19th Nov, 2008.

Were the new radiators new, or perhaps S/H with the possibility if some crud in there,creating gas ?It should correct itself with persistent bleeding and re-pressurising,but it is a pain.

the rads where brand new, I'll just keep bleading it, all the air is collecting in one rad, so it's easy todo

Team www.sheepspeed.com Racing

This is happening with one of mine too, can't figure it out!

Also one rad just won't get hot... but I think that's a fucked valve.

Let us know how you get on Jim.

Have you got any high points that cannot be bled?

I have a couple in my system and it usually takes a few weeks for all the air to come out.

For some reason the air collects in my office radiator. I know that when I get cold it's time for a bleed.

Edited by Paul S on 19th Nov, 2008.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Remember to repressurise after lots of bleeding!!!

Itll tell you how to do it in the handbook, or a sticker on the side

Edited by Nic on 19th Nov, 2008.