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Discuss Unvented heating system pressure in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Matthew Score

Gas Engineer
Messages
26
I have an issue with a Ideal logic 35kw boiler and system pressure.

Boiler was over pressuring and the prv kicked into action and released the excess pressure as it should.

My issue is I have changed the expansion vessel and prv.

Filled the system to 1.5 and set the heating running and at full temperature it went up to 3.

The system is quiet large, dormer bungalow with 12 x 600 x 1000 K2 rads.

Does the system need a second expansion vessel? Is the water volume to large for the one 10l internal vessel?

I have never had this issue before, just scratching my head a little bit.

Thank you for any advise given
 
Yes that often happens need to change that is a bit on the low side for expansion but you say it worked before , drop the system pressure to 1 bar see what happens ? Kop
 
Start off with pressure at 1 , not 1.5 .
Are you gas safe pal ?

Yes Gas safe,

I don't get my hands dirty to often though as I am manager but this is for my wife's friends, it's always the just can ya jobs

I haven't seen such a rise in pressure on a system like this before so a little unsure what's going off.
 
You rang ?
 
You check the hose isn't blocked to the expansion vessel

Rule of thumb 1l per rad
 
Whats the crack for Matthew here

Mathew send us your gas safe number I will process the request while he's building his post count ;) past 10

Help away will sort the thread out after
 
I changed the pipe, it was a bastard to get it to re-seal as it's down the side of the pump and wouldn't engage properly and weeped.

In the block wasn't crudded up / blocked ?

Eg got water at expansion vessel
 
Would say vessel too small then defo
 
Did you measure the pressure in the new vessel often over charged ? I would say fit a extra 8 litre vessel . Kop
 
+1 for the vessel being too small. Basically, the internal vessel is there to protect the boiler itself and will also do a few rads on a small system. Good advice given in this thread.
 

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