Worcester 28Si II, system bar pressure going very high.

[Last Plumber]

Very accurate statement mate

Thank for saying so.

 

[Luke78]

Just because someone is GSR does not mean they are experienced in Plumbing and Heating.

Very good fundamental point.

A gas engineer and a plumber are NOT the same thing.

I am a "GSR" (still need to build the post count before I get the tag, apparently), as seems to the popular term on this forum, and I have found this particular thread extremely instructive.

I am presently working on the same model of appliance with almost identical symptoms, and having perused some half dozen different back-issues of the Worcester manual from their website, I have not yet found any figures for the correct pressure setting for the expansion vessel.

Strangely, my Gas Safe training didn't go into detail on this particular detail of this particular model of boiler, manufactured at or around the particular time the benchmark certificate for the boiler says it was installed... (I was being sarcastic there, just to be clear , no offence meant to anyone, just trying to raise a smile...) so to suggest that just because someone is a GSR, they always have the answers is not really, strictly, accurate. Not that anybody was suggesting that, of course...

Point I would make is, even notwithstanding the fact that I am unquestionably legally qualified to work on the appliance, I do not know this (yet) and am at a loss as to where to get this kind of information.

Glad to see Jason got his issue resolved, and I am very grateful to him for sharing his experience as I believe it has also helped me with how to proceed on this matter.

For the finer points, I guess I will have to talk to the excellent Worcester help line, who have been a huge support to me already.

NB- I hope that the community at large will respect my frankness regarding the realities of being a newly-qualified engineer... I strive to be diligent and build my experience every day and to do everything the way I should, and where I don't know the answers, to seek them out, as I hope is illustrated by my reviewing this thread.
Nobody is born fully-experienced!

P.S: If anybody CAN point me to details regarding expansion vessel pressure etc, would be very grateful.

 

[Harvest Fields]

You know that this post is almost a year old mate?

 

[Luke78]

I do... But the information in it was still useful to me!

I generally try and review existing content before I post an appeal for help, as quite often there is a thread dealing with the issue already, and it saves me the embarrassment of being told "why didn't you look here...?" lol.

Admitedly, I did go off on a bit of a tangent, but I think the various points remain valid?

Happy to edit or delete if the mods disagree.

 

[gmartine]

Phone WB technical.

 

[Luke78]

Doing that very thing! Thanks guys...

 

[gmartine]

Think about it for a second...if the operating pressure of your system is set to say 1-1.2 bar the EV cannot be set any higher than that for it to function. (0.8 - 1.0 bar)

 

[Luke78]

Hi guys, further to previous, have had a chat with the nice lady at Worcester and have "filled in the blanks" re: settings and draining procedure (without emptying whole system!).

Thanks for all of your help, and now see the logic in your post, gmartine.

On a related matter, I have signed up to the Worcester Greenstar Junior class in November... There seem to be a lot of these about!

 

[ShaunCorbs]

Hi guys, further to previous, have had a chat with the nice lady at Worcester and have "filled in the blanks" re: settings and draining procedure (without emptying whole system!).

Thanks for all of your help, and now see the logic in your post, gmartine.

On a related matter, I have signed up to the Worcester Greenstar Junior class in November... There seem to be a lot of these about!

As you've passed the post count will sort your request out tonight

 

[Luke78]

Thanks Shaun-

For reference it transpired that the expansion vessel had failed; pressed the pin in the schraeder valve down and had a handy instant wash. Thanks for the support, all.

 

[Harvest Fields]

Thanks Shaun-

For reference it transpired that the expansion vessel had failed; pressed the pin in the schraeder valve down and had a handy instant wash. Thanks for the support, all.

Had it actually gone or was it just condensation?

 

[Luke78]

Had it actually gone or was it just condensation?

I am pretty sure it had gone, reasoning so based on fact that I drained out a washing up bowl and then some, and that when I attempted to re-pressurise with foot pump no pressure was retained by the vessel and more water blew out.

 

[ShaunCorbs]

I am pretty sure it had gone, reasoning so based on fact that I drained out a washing up bowl and then some, and that when I attempted to re-pressurise with foot pump no pressure was retained by the vessel and more water blew out.

Out of the inlet heating side or the air valve ?