Ferroli 77ff expansion vesssel problem?????

Jimmyjaffa · 18 Jan 2013

Hi all, i have a Ferroli 77ff combi, over the last few months it has been loosing pressure on a regular basis. i have done some research and the expansion vessel was suggested. when i went to check the pressure a fair bit of water came out of the valve and there was hardly any pressure. I'm assuming that the vessel is U/S and needs replacing. could someone confirm this and give me a rough price for the labour to change it. Many thanks, Jim

easyas123Viessmann · 18 Jan 2013

Is the shreider valve at the bottom or top? If at the bottom it is possibly ok. lower the system pressure to 0 and pump up the vessel to 1 bar. Then top up the system pressure to aprox 1 bar. check that your prv is not letting by.

Jimmyjaffa · 18 Jan 2013

PRV is OK and dry, The expansion vessel is at the top and to the rear. looking at the manual its a big round thing with a valve on it.

easyas123Viessmann · 18 Jan 2013

Is the the valve on the top of the vessel or the bottom?

Jimmyjaffa · 18 Jan 2013

When looking at the boiler the valve is at the top rear right of the boiler.

easyas123Viessmann · 18 Jan 2013

in assume that makes it at the top of the vessel. This almost certainly means a knackered vessel. Not familiar with this boiler so not sure of cost. you could get a vessel fitted externally. This could be correctly sized and cheaper. Do you have space for an external vessel?

Jimmyjaffa · 18 Jan 2013

Yes I think I would. Would this be a sphere type as the one that's on looks like a steering wheel disc lock.

easyas123Viessmann · 18 Jan 2013

yep. go for it.

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Ferroli 77ff expansion vesssel problem?????

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