Will an accumulator solve this issue?

[Madrab]

Lol - Fair enuf - they are red and can be used on potable water

That being said if you look at their own site - the ones they specif for Boilers,Solar and CH are all red
http://www.varem.com/expansion-vessels
The ones they specify for potable water/unvented hot water etc all seem to be blue or white
http://www.varem.com/multifunction-tanks
Pressure tanks - Used for pumped water supplies - etc
http://www.varem.com/pressure-tanks



Fair play though, even though they are pressure tanks more targeted towards where a pumped cold supply is installed. I guess they could be utilised as an EV as part of an UVHW installation.

 

[LordFrederickIII]

Can you post a decent picture?

Are these better?

 

[LordFrederickIII]

Can't remember previous posts - is this an OSO cylinder with an internal air bubble.

Yes its a OSO Cylinder 20 RD (330l capacity). Don't know about the internal air bubble

 

[Dan Robinson]

Not really. Need to see as much of the installation as possible. Get rid of that old Tank jacket - it's doing next to nothing anyway.


But looking at this, you need some one in , sharpish, that knows what they're talking about.

 

[Madrab]

Oh dear, as Dan suggest, that doesn't look very good.

I would suggest you want a plumber that has the relative qualifications in to do a complete check on that installation. Do you have the benchmark doc for it?

 

[Dan Robinson]

My worry is it was full of what looked like sludge. Plumber said its normal, but I have a doubt in the back of my mind

This plumber is a 'tard. Get a new one!

 

[LordFrederickIII]

Oh dear, as Dan suggest, that doesn't look very good.

I would suggest you want a plumber that has the relative qualifications in to do a complete check on that installation. Do you have the benchmark doc for it?

No docs. This is more or less how it was when we moved in

 

[LordFrederickIII]

The expansion vessel wasn't there until I got someone in to clean the strainer. They put the vessel on at that point saying it was a building regs requirement. They were G3 registered.

 

[Dan Robinson]

They obviously didn't realise there is a bubble inside the cylinder (unless the dip tube was removed). Eitherway.... you need this looking at by someone with an IQ approaching at least double figures with no scuff marks on his knuckles.

 

[LordFrederickIII]

They obviously didn't realise there is a bubble inside the cylinder (unless the dip tube was removed). Eitherway.... you need this looking at by someone with an IQ approaching at least double figures with no scuff marks on his knuckles.

I'd agree.

Just been reading the OSO installation manual and nowhere does it specify any expansion vessel coming off the PRV as per my pic.

What it does show is this, and that's not how my expansion vessel is set up

 

[LordFrederickIII]

That red valve is on the balanced cold draw off from the Safety group.

Can you put that in layman terms please?

 

[Madrab]

They obviously didn't realise there is a bubble inside the cylinder (unless the dip tube was removed). Eitherway.... you need this looking at by someone with an IQ approaching at least double figures with no scuff marks on his knuckles.

Yup +1, Get someone in as soon as you can.

There are a few things there that could be a concern. The EV should not be installed there and could be compromised by the PRV, that's a problem if the dip tube has been removed and the tank no longer has an air bubble

 

[Madrab]

The pipe running from the multi function valve ( safety group) to the EV is a balanced cold supply pipe, primarily for feeding a mixer shower etc etc so it gets cold water at the same pressure as the hot.
The only reason an EV should be on that is to cover off a shower installation and it's not to provide a route to an expansion vessel that's potentially protecting the cylinder.
It's only one of several safety features but these cylinders have backup's if one safety feature fails, so they all need to be fit for purpose, installed correctly and working properly

 

[LordFrederickIII]

The pipe running from the multi function valve ( safety group) to the EV is a balanced cold supply pipe, primarily for feeding a mixer shower etc etc so it gets cold water at the same pressure as the hot.
The only reason an EV should be on that is to cover off a shower installation and it's not to provide a route to an expansion vessel that's potentially protecting the cylinder

Ah ok, thanks for the explanation. I take it that it the oulet in the PRV would normally be capped off if it wasn't being used as balanced supply?

 

[Madrab]

Yes. Unless it is feeding something like a shower, yours only seems to run to the EV

AS dan says, if they have removed the dip tube to increase the tanks volume then the EV should be fitted but as your pic shows, it should not have a valve between it and the inlet to the cylinder. If that valve failed then the route to the EV could be compromised. The EV also needs to be WRAS approved for potable water.

Honestly, get a recommended qualified un-vented specialist in as soon as you can.