Auto air vent question

[markyhud]

For years I've had the following auto air vent in the airing cupboard.

It tends to weep when set to the open position and so today I've fitted this Honeywell EA122 jobby.

It vented automatically as it should when refilling the system but with a manual vent I was able to shift more stubborn air after a few hours. I did see in the instructions that it should be positioned on the positive side of the system. Is this referring to a combi boiler setup? It's positioned on the return from the coil. Any thoughts? I think it's just a case of letting it do it's thing over the next few days

 

[Simon F]

the positive refers to where it is on the system in relation to the pump.
(and depending on where the fill/vent is situated)
after the pump on the flow side is positive,
so the water will be giving positive pressure rather than the possibility of having a pulling effect on the negative side of the system, ie before the pump

 

[markyhud]

the positive refers to where it is on the system in relation to the pump.
(and depending on where the fill/vent is situated)
after the pump on the flow side is positive,
so the water will be giving positive pressure rather than the possibility of having a pulling effect on the negative side of the system, ie before the pump

That's great thanks as this vent is after the pump. Cheers

 

[Chalked]

Need to be fitted vertically too, the float can stick open or shut when mounted like that.

 

[markyhud]

Need to be fitted vertically too, the float can stick open or shut when mounted like that.

Balls! Knew it was too good to be true. Would I be better sticking with the cheaper type I did have?
What happens if the float sticks? Does it just stop venting?

 

[Chalked]

East fix is two 1/2" bsp male and female elbows fitted together and into the vent connection will get rid of the angle.
MALLEABLE IRON & STEEL, BSP THREADED FITTINGS

 

[markyhud]

East fix is two 1/2" bsp male and female elbows fitted together and into the vent connection will get rid of the angle.
MALLEABLE IRON & STEEL, BSP THREADED FITTINGS

Sorry but as an amateur what exactly is a malleable fitting and how do they go together to get rid of the angle? I would rather give something like this a go and stick with the new vent than go back to the cheaper type

 

[Chalked]

Sorry but as an amateur what exactly is a malleable fitting and how do they go together to get rid of the angle? I would rather give something like this a go and stick with the new vent than go back to the cheaper type

drain the heating down to below the air vent and remove, p.t.f.e both male ends of the elbows, screw the first into the fitting you have the air vent fitted into, this is tightened until it points in your case 90 degrees to the right. Then screw the second elbow into the first and tighten until it is tight and points vertically. Then refit the auto air vent into this.

quite hard to describe by text but get two from your local merchant and it will make sense.

 

[Reg Man]

It looks like its on the flow not the return, unless you have reversed the pipes. Why are you getting so much air would be a better question? What is the open vent cold feed arrangement?

 

[markyhud]

drain the heating down to below the air vent and remove, p.t.f.e both male ends of the elbows, screw the first into the fitting you have the air vent fitted into, this is tightened until it points in your case 90 degrees to the right. Then screw the second elbow into the first and tighten until it is tight and points vertically. Then refit the auto air vent into this.

quite hard to describe by text but get two from your local merchant and it will make sense.

I did go to bed a bit confused but then had a light bulb moment about this and that was exactly what I was thinking. Cheers!