Bungs and automatic vents

[WaterTight]

Did I hear someone on here say that if bunging the vent and feed of a tank you should also make sure automatic air vents are closed? Is this true? I thought air would only go one way with them.

If it's true how do you close them? And also, presuming you might not find all of them - do they constitute much of a risk?

Or did I mis-read and they were talking about something else you must do when bunging? And if so, what would that be?

Thanks

 

[wheeto]

Did I hear someone on here say that if bunging the vent and feed of a tank you should also make sure automatic air vents are closed? Is this true? I thought air would only go one way with them.

If it's true how do you close them? And also, presuming you might not find all of them - do they constitute much of a risk?

Or did I mis-read and they were talking about something else you must do when bunging? And if so, what would that be?

Thanks

Once the pressure in the system drops the float in the vent can drop so your system won't be bunged, and will allow air in.

 

[WaterTight]

Gotcha, so how do you close them? Not touched one before. I see some are sold as demountable for maintenance.

 

[Resolute]

How do you find em too!

 

[WaterTight]

Well yeah. I remember working in a loft with my old boss and he installed one in the far corner, in what would normall be pitch black, behind a tuft of loft insulation, because that was the highest point that part of the installation..

 

[AWheating]

best to fit them in visable possitions as they tend to leak and need changing.

 

[WaterTight]

Ok. Two questions still remain. How do you turn them off / shut them off? And when using bungs do you hunt through every inch of pipework in loft etc to find them all or take a punt?

 

[stokecity]

they have a cap on them, most look like the black valve cap on a bycle tyre, just screw it down,
i think on open vented systems they dont need them as air vents through the vent pipe, may be one on top of the boiler. with cealed sytems with pipe work in loft u will probably just have to trace the pipework untill u find them

 

[WaterTight]

Ok cheers. So with a vented system a cursory peek around the loft and in the airing cupboard would probably suffice?

 

[stokecity]

yes mate, the vent pipe will be the highest point