hi Corylus, some pics of my own system that i installed some years ago showing A.A.V. in correct position, if the pics are any use for an example of how it should be installed you are quite welcome to use them, i and i am sure all the guys here wish you well, cheers

hi Corylus, just click on the name orf the pic then save it to desktop or other place,cheers

Robbo's all over it!

Good luck corylus!

Hi guys. Help me think this out? Just tell me where it's wrong.

If this AAV ain't working and the HWC is at 85° and the pump gets switched off by the controller, the water in the manifold is trapped? So it boils? And the steam can't vent. And as I understand it the conversion rate for water to steam, volumewise is 1660? That's some pressure up there then I imagine. And it continues to heat. Superheated steam? Must be a very well made manifold huh? It's a pity it didn't blow - he might have paid some attention to that. Instead it seems to have forced the steam against all its natural inclinations back down into the tank with resultant ructions as it collected up top trying to get out the narrow header pipe?

So. If the vent is actually working and steam can escape, the temp in the manifold shouldn't get above 100°? Is this your experience? What happens when the steam is all vented then? The manifold is empty? That must be interesting for the pump once it gets switched back on?

I see you are all having fun with your red cards. I wish I'd known there was such a thing . . . but I can see they are causing you aggro. You're not alone with this board and its antics you know. It seems to be widespread. If you knew the inside story of what goes on in the field of education - you wouldn't let your kids go to school. The people who make the decisions are not involved in the actual work, so their decisions tend to be utter nonsense (feckin' stupid as Badger might say). Same in hospitals these days. And as for being a soldier . . . well . . . you can forget about the bods up there in their safe offices having a clue what they are about.

Hi robbo - yes that's the plan exactly. But I'm trying to put together my case and I need to know if my thinking is correct.

Your good advice needs money what I ain't got. Hence the need to screw some out of the guy who put it in. But I dont want to start  something unless I can win. So I need to be right. I'm hoping to horrify the referee by explaining what this man has done by installing a safety vent that can't work. That sounds OK but it doesn't tell the story of what is happening up on that roof - which is pretty damn horrifying. And worse - what goes on in my airing cupboard if I let it - which is terrifying as well.

hi Corylus, if the original installer will not fix it, you are entitled to have it fixed by another installer then send the account to the original installer, it`s really as simple as that, of course if he will not pay then you have a concrete case at the tribunal,cheers