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Worcester Boiler pressure question
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orion....@virgin.net
Dec 23, 2012, 10:16:29 AM12/23/12
to
Hi all,
Well I added a couple of new rads to my CH system and that seems to have upset my Worcester Greenslave combi boiler. To cut a long story short, when I repressurised the boiler using the cold mains inlet valve, I did accidentally allow the pressure gauge on the boiler to go up to 2.5 bar and remain there for quite a while until I managed to get it down to 2 bar. I gather it should read between 1 and 1.5 bar so it's still too high. I read I can get this pressure down by bleeding more rads if it's necessary. I haven't bled the boiler as AFAIK it's not necessary.
Anyway, the boiler's thrown out water from somewhere inside itself which has spilled onto the kitchen floor. Could this leak be due to the pressure being on the high side, do you think? If so, why don't they have an overflow to take care of this possibility?
Well I added a couple of new rads to my CH system and that seems to have upset my Worcester Greenslave combi boiler. To cut a long story short, when I repressurised the boiler using the cold mains inlet valve, I did accidentally allow the pressure gauge on the boiler to go up to 2.5 bar and remain there for quite a while until I managed to get it down to 2 bar. I gather it should read between 1 and 1.5 bar so it's still too high. I read I can get this pressure down by bleeding more rads if it's necessary. I haven't bled the boiler as AFAIK it's not necessary.
Anyway, the boiler's thrown out water from somewhere inside itself which has spilled onto the kitchen floor. Could this leak be due to the pressure being on the high side, do you think? If so, why don't they have an overflow to take care of this possibility?
harry
Dec 23, 2012, 10:28:11 AM12/23/12
to
It has lifted to get rid of the over pressure. So nothing to worry
about. But you should reduce the system pressure to that which is
recommended.
This valve only operates in "emergency"
Lucky for you it was there!
Roger Mills
Dec 23, 2012, 12:31:49 PM12/23/12
to
the outside world in the event of the pressure rising too high. It
shouldn't spill onto the kitchen floor. Something is wrong somewhere!
--
Cheers,
Roger
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orion....@virgin.net
Dec 23, 2012, 12:51:03 PM12/23/12
to
Since I'm losing system pressure according the gauge on the front, I'm guessing that the leak and the pressure loss are related. Funny how these things always seem to go tits-up at the worst possible time when everybody's on holiday. :(
Any ideas how to proceed?
BartC
Dec 23, 2012, 1:33:46 PM12/23/12
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<orion....@virgin.net> wrote in message
news:eb59ac40-3bf3-40ee...@googlegroups.com...
The boiler should have been designed to work at 2.5bar which is probably
around it's operating pressure anyway.
Perhaps the pressure relief valve has operated, but the overflow pipe has a
bad joint or the water is somehow flowing back in to the house.
Maybe check out the pipe outside, or take the cover off and have a look. It
might not be as packed as you think.
--
Bartc
news:eb59ac40-3bf3-40ee...@googlegroups.com...
around it's operating pressure anyway.
Perhaps the pressure relief valve has operated, but the overflow pipe has a
bad joint or the water is somehow flowing back in to the house.
Maybe check out the pipe outside, or take the cover off and have a look. It
might not be as packed as you think.
--
Bartc
orion....@virgin.net
Dec 23, 2012, 1:50:09 PM12/23/12
to
On Sunday, 23 December 2012 19:33:46 UTC+1, Bart wrote:
> The boiler should have been designed to work at 2.5bar which is probably
>
> around it's operating pressure anyway.
Nope!
> The boiler should have been designed to work at 2.5bar which is probably
>
> around it's operating pressure anyway.
> Perhaps the pressure relief valve has operated, but the overflow pipe has a
>
> bad joint or the water is somehow flowing back in to the house.
> Maybe check out the pipe outside, or take the cover off and have a look. It
>
> might not be as packed as you think.
rbel
Dec 23, 2012, 2:56:09 PM12/23/12
to
On Sun, 23 Dec 2012 10:50:09 -0800 (PST), orion....@virgin.net
wrote:
>
>> Perhaps the pressure relief valve has operated, but the overflow pipe has a
>>
>> bad joint or the water is somehow flowing back in to the house.
>
>
>> Maybe check out the pipe outside, or take the cover off and have a look. It
>>
>> might not be as packed as you think.
>
>I have and it is!
I take it that your boiler is a WB Greenstar combi. You may want to
download the technical and specification guidance at
http://www.worcester-bosch.co.uk/installer/boilers/gas-boilers/greenstar-29cdi-classic/literature
On page 20 there are simple diagrams which shows the layout of the
connections with the pressure relief valve at the far right. The
connections manifold is located at the base of the boiler. When you
have located the pipe connected to the pressure relief you should be
able to trace its route.
--
rbel
wrote:
>
>> Perhaps the pressure relief valve has operated, but the overflow pipe has a
>>
>> bad joint or the water is somehow flowing back in to the house.
>
>
>> Maybe check out the pipe outside, or take the cover off and have a look. It
>>
>> might not be as packed as you think.
>
>I have and it is!
download the technical and specification guidance at
http://www.worcester-bosch.co.uk/installer/boilers/gas-boilers/greenstar-29cdi-classic/literature
On page 20 there are simple diagrams which shows the layout of the
connections with the pressure relief valve at the far right. The
connections manifold is located at the base of the boiler. When you
have located the pipe connected to the pressure relief you should be
able to trace its route.
--
rbel
BartC
Dec 23, 2012, 2:55:31 PM12/23/12
to
<orion....@virgin.net> wrote in message
news:c6970576-1dd9-4c75...@googlegroups.com...
> On Sunday, 23 December 2012 19:33:46 UTC+1, Bart wrote:
>
>> The boiler should have been designed to work at 2.5bar which is probably
>>
>> around it's operating pressure anyway.
>
> Nope!
At what pressure does the pressure relief valve operate? If it's the usual 3
>
>> The boiler should have been designed to work at 2.5bar which is probably
>>
>> around it's operating pressure anyway.
>
> Nope!
bar, then pipe-work inside the boiler ought to be rated to at least 3 bar.
Are you saying the pressure relief cuts in at a much lower figure? That
would be unusual. In any case, the installation manual for the Worcester
Greenstar (not the Greenslave), mentions something about having an extra
expansion vessel when the hot operating pressure is over 2.65bar. That
suggests that 2.5 bar is within spec.
>> Maybe check out the pipe outside, or take the cover off and have a look.
>> It
>>
>> might not be as packed as you think.
>
> I have and it is!
--
Bartc
orion....@virgin.net
Dec 23, 2012, 3:29:46 PM12/23/12
to
It's a floor-standing, oil-fired Worcester Greenstar Heatslave condensing combination boiler to give it its full title...
ISTR that Worcester used to make decent quality boilers once upon a time. Seems Bosch aren't so particular about quality control; clearly more interested in taking over other companies in a grab for global domination, it seems. Hitler would have been proud of them. :-/
orion....@virgin.net
Dec 26, 2012, 7:22:28 AM12/26/12
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Well I have at least now located the general area of the leak, thankfully. There are two large vessels (both jacketed) at the base of the boiler and water is seeping from a mid point where they butt up against each other towards the front where the front panel (currently removed to permit inspection)normally resides.
Unfortunately the jacketing and total lack of clearance it causes makes more precise detection of the source of the problem impossible without removing the jackets - and that doesn't look at all easy.
However, the leak is intermittent so I'm guessing it's some sort of valve problem rather than any crack in a vessel or split in a pipe. Got the installer coming Friday so at least he'll have something to go on now...
Funny how these things always happen at Christmas. :(
Unfortunately the jacketing and total lack of clearance it causes makes more precise detection of the source of the problem impossible without removing the jackets - and that doesn't look at all easy.
However, the leak is intermittent so I'm guessing it's some sort of valve problem rather than any crack in a vessel or split in a pipe. Got the installer coming Friday so at least he'll have something to go on now...
Funny how these things always happen at Christmas. :(
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