The expansion vessel has gone the boiler unfortunately. I say this because water as well as air came out when I pressed on the valve. I had hoped that the loss of circuit pressure was just due to a faulty PRV (which also needs to be replaced).

It doesn't look feasible ( for me anyway) to remove the faulty unit due to inaccessibility of the union nut and the inadequate clearance at the top of the boiler prohibiting the removal and refitting of the vessel.

So I was wondering what size of external vessel I would need (the same as the original?) and the best place to 'T' it in . I've read it goes in the CH return leg of the pipework but are there any other factors to bear in mind when fitting it? Do I have to stick with a Vaillant part if there are cheaper alternatives?

As a matter of interest how does the pipe connecting the (original) vessel fit into the rest of the boiler tubing, it looks like a push in connector held with a clip? If this is all it is could I attempt to remove it and connect the new vessel to this point?

Thanks all,

In message , Milsec
writes

The expansion vessel has gone the boiler unfortunately. I say this
because water as well as air came out when I pressed on the valve. I
had hoped that the loss of circuit pressure was just due to a faulty
PRV (which also needs to be replaced).


As a matter of interest how does the pipe connecting the (original)
vessel fit into the rest of the boiler tubing, it looks like a push in
connector held with a clip? If this is all it is could I attempt to
remove it and connect the new vessel to this point?

DIYBanter ?

the house is ****ed, sell it and buy another one


--
geoff

In article ,
Milsec writes:

So I was wondering what size of external vessel I would need (the same
as the original?) and the best place to 'T' it in . I've read it goes in
the CH return leg of the pipework but are there any other factors to
bear in mind when fitting it?

I don't think it's a major issue, but some boiler instructions
(in cases where it's not integral) say it should be near the
pump inlet in the pipework. My guess is this helps ensure the
pump sees a steady pressure as valves open/close and the pump
starts up, and this may reduce cavitation inside the pump.

Do I have to stick with a Vaillant part
if there are cheaper alternatives?

Certainly not if you're fitting it outside the boiler.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Sat, 14 Jun 2008 16:05:25 +0100, Milsec wrote:

The expansion vessel has gone the boiler unfortunately. I say this
because water as well as air came out when I pressed on the valve. I had
hoped that the loss of circuit pressure was just due to a faulty PRV
(which also needs to be replaced).

It doesn't look feasible ( for me anyway) to remove the faulty unit due
to inaccessibility of the union nut and the inadequate clearance at the
top of the boiler prohibiting the removal and refitting of the vessel.


So I was wondering what size of external vessel I would need (the same
as the original?) and the best place to 'T' it in . I've read it goes in
the CH return leg of the pipework but are there any other factors to
bear in mind when fitting it? Do I have to stick with a Vaillant part
if there are cheaper alternatives?

As a matter of interest how does the pipe connecting the (original)
vessel fit into the rest of the boiler tubing, it looks like a push in
connector held with a clip? If this is all it is could I attempt to
remove it and connect the new vessel to this point?

Thanks all,

I presume you've read the FAQ on account of the questions you are now
asking.

You should be looking at about the same volume vessel as before (assuming
it was adequate); 12 litres should do it.

You need to find a suitable place somewhere on the return pipework.
Leave the failed vessel in the boiler. The official maintenance action
involves removing the boiler from the wall!
Set the new vessel to 0.8 bar on the dry side less/plus 0.1 bar for every
meter of altitude above/below the boiler.

HTH






--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

In message , Ed Sirett
writes
On Sat, 14 Jun 2008 16:05:25 +0100, Milsec wrote:

The expansion vessel has gone the boiler unfortunately. I say this
because water as well as air came out when I pressed on the valve. I had
hoped that the loss of circuit pressure was just due to a faulty PRV
(which also needs to be replaced).

It doesn't look feasible ( for me anyway) to remove the faulty unit due
to inaccessibility of the union nut and the inadequate clearance at the
top of the boiler prohibiting the removal and refitting of the vessel.


So I was wondering what size of external vessel I would need (the same
as the original?) and the best place to 'T' it in . I've read it goes in
the CH return leg of the pipework but are there any other factors to
bear in mind when fitting it? Do I have to stick with a Vaillant part
if there are cheaper alternatives?

As a matter of interest how does the pipe connecting the (original)
vessel fit into the rest of the boiler tubing, it looks like a push in
connector held with a clip? If this is all it is could I attempt to
remove it and connect the new vessel to this point?

Thanks all,

I presume you've read the FAQ on account of the questions you are now
asking.

You should be looking at about the same volume vessel as before (assuming
it was adequate); 12 litres should do it.

You need to find a suitable place somewhere on the return pipework.
Leave the failed vessel in the boiler. The official maintenance action
involves removing the boiler from the wall!
Set the new vessel to 0.8 bar on the dry side less/plus 0.1 bar for every
meter of altitude above/below the boiler.

It's a diybanter - prolly doesn't have the first idea where to look

--
geoff

Thanks everyone,
Ed, yes I did read your FAQ which did point me in the direction of the PRV and then to the expansion vessel.
Many thanks for that and your advice (and your previous help with the divertor valve).