Expansion vessel hose

[Matt0029]

Thank you it was just this that made me wonder.

 

[John.g]

Can't post spreadsheet files but if you build your own and follow the simple displayed calculations, then you can see the effect of the different inputs, just use the same cell locations that I use.

 

[ShaunCorbs]

Pre charge is wrong jon normally 3-3.5 bar

 

[John.g]

I would have thought that it should be set at or 0.2bar below the cold water pressure after the PRV, if the pre charge is set to 3.0bar then the final pressure will be 4.36bar no matter what the cold water pressure is from = or < 3.0bar, and 5.03bar if precharge set to 3.5 bar from a cold water pressure of = or < 3.5bar.
If unregulated cold water pressure then maybe set precharge to 3.5bar?.

 

[ShaunCorbs]

That’s what it states normally see below for full spec

 

[Matt0029]

Is there anywhere on that picture where it states what size expansion is needed?

 

[ShaunCorbs]

Is there anywhere on that picture where it states what size expansion is needed?

No but mi do 2 mins

 

[ShaunCorbs]

As below

 

[Matt0029]

So that's saying 25litre expansion vessel for 250 litres

 

[John.g]

A 287L Cyl & 25L EV with precharge/filling pressures of 3.0bar/3.0bar will give a final pressure of 4.06bar
A 250L Cyl & 25L EV with precharge/filling pressures of 3.0bar/3.0bar will give a final pressure of 3.90bar