Yup, very true .... combined feed and ventHave come across a few where the feed does both jobs
Airlock in CH system
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Not sure if you've misread me mate, but I meant... No Vent... Feed just draws and pushes up into the f&e via a single pipe... Thus introducing hot water into the f&e at the outlet.
To me, a combined f&v means 1 pipe from the f&e to the system, but it splits just below the f&e into a feed and vent.
Just seeing if we're on the same page
Yup was agree'ing @dilalio ... seen it both ways too and just call them both a combined, can't think of what else they would be ....
seen one where the feed was disconnected and the 22mm vent was plugged straight in to the f&e .... that was where an older system have it's components/pump upgraded and then there's was pumping over issues apparantly ....
the other was where there was a tee off to an up and over into the f&e to allow a free flow for safety venting but it was still the old vent they used as the feed had blocked and it was over 4 floors.
If the boiler has an overheat stat though .....
It all needs to be at least 22mm though so it has full room for expansion. Found they can be a pain in the ass to fill sometimes though as air and water in the same pipe and I'm not sure every manufacturer supports the layout.
seen one where the feed was disconnected and the 22mm vent was plugged straight in to the f&e .... that was where an older system have it's components/pump upgraded and then there's was pumping over issues apparantly ....
the other was where there was a tee off to an up and over into the f&e to allow a free flow for safety venting but it was still the old vent they used as the feed had blocked and it was over 4 floors.
If the boiler has an overheat stat though .....
It all needs to be at least 22mm though so it has full room for expansion. Found they can be a pain in the ass to fill sometimes though as air and water in the same pipe and I'm not sure every manufacturer supports the layout.
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