How do air separators work?
Air separators - such as Screwfix 90641 have been mentioned from time to
time. They seem to consist of two concentric cylinders, with four connections - one each end and two off the side, near the ends. Can anyone enlighten me as to: * How they work (what's inside?) * Where to put them in the circuit? * How to connect them - what are the 4 tappings for? TIA. -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
On Sat, 8 Jan 2005 12:22:12 -0000, "Set Square"
wrote: Air separators - such as Screwfix 90641 have been mentioned from time to time. They seem to consist of two concentric cylinders, with four connections - one each end and two off the side, near the ends. Can anyone enlighten me as to: * How they work (what's inside?) * Where to put them in the circuit? * How to connect them - what are the 4 tappings for? TIA. I'm not sure about that specific one, but the principle is that you bring the feed/expansion pipe, the vent and an in/out connection to the circuit together, with the vent at the top. The water in the circuit passes through the chamber and air bubbles rise out from it. Some of them have a baffle or equivalent arrangement inside to provide a longer path (more time) in the chamber. http://www.bes.ltd.uk/products/106.asp (look at Aerjec) Apart from separating air out, because the vent and feed pipes join at a common location, there should be no pump over or suck down either. -- ..andy To email, substitute .nospam with .gl |
In an earlier contribution to this discussion,
Andy Hall wrote: On Sat, 8 Jan 2005 12:22:12 -0000, "Set Square" wrote: Air separators - such as Screwfix 90641 have been mentioned from time to time. They seem to consist of two concentric cylinders, with four connections - one each end and two off the side, near the ends. Can anyone enlighten me as to: * How they work (what's inside?) * Where to put them in the circuit? * How to connect them - what are the 4 tappings for? TIA. I'm not sure about that specific one, but the principle is that you bring the feed/expansion pipe, the vent and an in/out connection to the circuit together, with the vent at the top. The water in the circuit passes through the chamber and air bubbles rise out from it. Some of them have a baffle or equivalent arrangement inside to provide a longer path (more time) in the chamber. http://www.bes.ltd.uk/products/106.asp (look at Aerjec) Apart from separating air out, because the vent and feed pipes join at a common location, there should be no pump over or suck down either. Thanks for that. Presumably they can only be used in vented - and not sealed - systems? -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
"Andy Hall" wrote in message ... On Sat, 8 Jan 2005 12:22:12 -0000, "Set Square" wrote: Air separators - such as Screwfix 90641 have been mentioned from time to time. They seem to consist of two concentric cylinders, with four connections - one each end and two off the side, near the ends. Can anyone enlighten me as to: * How they work (what's inside?) * Where to put them in the circuit? * How to connect them - what are the 4 tappings for? TIA. I'm not sure about that specific one, but the principle is that you bring the feed/expansion pipe, the vent and an in/out connection to the circuit together, with the vent at the top. The water in the circuit passes through the chamber and air bubbles rise out from it. Some of them have a baffle or equivalent arrangement inside to provide a longer path (more time) in the chamber. http://www.bes.ltd.uk/products/106.asp (look at Aerjec) Apart from separating air out, because the vent and feed pipes join at a common location, there should be no pump over or suck down either. -- .andy To email, substitute .nospam with .gl I'm sure I'm missing something... surely fitting these masks any problems - if I have to continually bleed a radiator then I would look for where air is getting into the system - with one of these fitted I'd never know. Peter |
" I'm sure I'm missing something... surely fitting these masks any problems - if I have to continually bleed a radiator then I would look for where air is getting into the system - with one of these fitted I'd never know. Peter Also will bleed out any gases produced that are not soluble in water. I've got one on one of our systems - not sure how good it is though. Nick |
On Sat, 08 Jan 2005 15:49:58 GMT, "Peter Andrews"
wrote: I'm sure I'm missing something... surely fitting these masks any problems - if I have to continually bleed a radiator then I would look for where air is getting into the system - with one of these fitted I'd never know. Peter I would look at it the other way round. You shouldn't be getting air sucked into the system via the vent when one of these is installed, so this leaves only joints for introduction of air. The more typical scenario of gas build up in radiators if it isn't suck down from the vent is hydrogen from corrosion and that's a different issue. You will still get some build-up of hydrogen in radiators. -- ..andy To email, substitute .nospam with .gl |
On Sat, 8 Jan 2005 15:06:12 -0000, "Set Square"
wrote: Thanks for that. Presumably they can only be used in vented - and not sealed - systems? Yes. It would be pointless having one in a sealed system anyway, because generally once the initial air and dissolved air is removed, there should not be anything much more unless there is a joint which allows air to be sucked in. The more likely situation is hydrogen from corrosion. For a sealed system you can use an automatic air vent, or there are suitable air separators. I used both on my system, with a Reliance air separator. This goes inline in the circuit and is a vertical column with stainless steel screen inside to help separate out the air and a relief valve on the top. Take a look at www.rwc.co.uk Unfortunately the search on this site isn't great but the info is there. Do a search on the site using keywords "heating" and "products" and you will get a clickable link to a page with a diagram of a house. Scroll down and you will find air separators. e.g. ASEP 192 103 They look like a robot's genitals..... These devices collect the small amount of air that may gather and can be periodically purged by unscrewing the gap and pressing the button inside. -- ..andy To email, substitute .nospam with .gl |
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