Biasi M90E.24S boiler refilling?

[Coupe20vt]

A friend of mine has suggested i ask a question on this forum as he's had a lot of help on here!

We have a biasi combi boiler and can't work out how to refill it, i need to refil a radiator, the pressure is at around 0.9 bar.

The instructions are pretty clear saying there are two control valves attached to a flexi pipe, except there is only one control valve (black):

When I open the valve nothing happens? I was expecting the pressure to rise with the associated water rushing noise.

I've Checked the length of flexi and there is definitely no other co volt valve that I can see. The flexi joins the third pip along at the T piece, it has a 10mm nut in the section attached to the t piece pipe. I loosened this off and it leaked so I'm guessing its not that!

Can anyone help me or point me in the right direction?

 

[ukrobj]

the black handle end is the cold water mains (t-piece) then the flexible hose should feed into the return central heating pipe. It looks like it feeds into a non-return valve is i can see correctly. If you can take the flexible hose off by the non- return valve and open up the black handle and see if mains water is expelled.

If it is, then there may be a screwdriver slot the other end preventing it reaching the central heating side.

 

[Agile]

Check the shaft under the black knob is really turning.

The double non return valve at the other end may be blocked/jammed.

Tony

 

[Coupe20vt]

Thanks for the replies.

There was water flowing through the pipe from the black valve. I turned it while the washing machine was filling and the rate of filling dropped off dramatically.

I bled the radiator and the pressure did not change. After I bled I turned the black valve and could hear water rushing in. Maybe the pressure gauge has failed?!

 

[Agile]

The internal tube to the gauge often blocks.

Sometime they respond very slowly afterwards.

If your mains pressure is not too high then leave the filling valve open for a few seconds until you hear the flow rate start to slow.

Tony

 

[landyandy]

The non return valve might be blocked.

 

[emjayd83]

Hi, I'm not great with boilers but I have no pressure and this type of boiler, could some one explain what the yellow and blue leavers are? I don't have the black one as in this picture but we have no user manualto help us. Thanks in advance

 

[ukrobj]

Yellow is gas, blue is mains water.

 

[Coupe20vt]

You can find the manual here http://www.biasi.co.uk/images/manuals/RIVA_COMPACT/INSTALLATION_USER/1908 EDITION.pdf

 

[emjayd83]

Thank you