Correct Expansion Vessel Pressure

[Steve_Kay]

Evening all,

So I've been losing pressure from my boiler on a daily basis and having to top it up. The pressure gauge is up at around 3.5 bar when the boiler is on so I assumed the expansion vessel has either failed or is low on pressure. I had a look on both the Cimms website (the EV is a Cimm RP250 10 litre) and it shows that it requires 1.5 bar of pressure. The sticker on the EV shows 0.8 bar (I think). Anyway, to stay on the safe side I decided to stick around the 1 bar mark. I checked the shraeder valve and air came out with no water which seemed promising. I topped it up to 1 bar and then tried again but there's no difference. It took very little to fill it to one bar (about 1 second) so I'm assuming the correct pressure is 1.5 bar. Any thoughts?

Thanks

Steve

 

[Last Plumber]

What pressure are you running the system at?
Did you de-pressurize the wet side before charging the dry?
The wet side needs to remain at zero pressure whilst charging the dry side.

 

[Steve_Kay]

What pressure are you running the system at?
Did you de-pressurize the wet side before charging the dry?
The wet side needs to remain at zero pressure whilst charging the dry side.

The system usually runs at around 1-1.5 bar. Yeah I de-pressurised the heating circuit and then isolated the flow and return. The pressure gauge rose to 1 bar as I charged the EV. Not sure if that answers your question but thanks for the reply.

 

[townfanjon]

Are you gas safe Steve ?

 

[Last Plumber]

The system usually runs at around 1-1.5 bar. Yeah I de-pressurised the heating circuit and then isolated the flow and return. The pressure gauge rose to 1 bar as I charged the EV. Not sure if that answers your question but thanks for the reply.

You need to pressurise the dry side and use a gauge on that side.
No pressure should be allowed to build in the wet side as you charge it.
I would charge it to 1 bar.
If this is internal to the boiler you are supposed to be gas safe registered. Did you know that?
It looks on the photo as the vessel is on the rear?

 

[Steve_Kay]

You need to pressurise the dry side and use a gauge on that side.
No pressure should be allowed to build in the wet side as you charge it.
I would charge it to 1 bar.
If this is internal to the boiler you are supposed to be gas safe registered. Did you know that?
It looks on the photo as the vessel is on the rear?

Thanks mate. No I wasn't aware. I'll get someone round to take a look. Thanks for the advice.