On 20/01/2011 20:10, Lobster wrote:


It's a Vaillant Vantage - have found the instructions he
http://www.docstoc.com/docs/4923997/Installation-Instructions-GB-Unvented-hot-water-storage-cylinders-for
(or
http://preview.tinyurl.com/4z76wch

It does have an expansion vessel sitting above the tank - so do we
reckon that just needs replacing, then (looks very straightforward, ie
it just unscrews - is it actually a diy job or are there big safety
implications and I shouldn't touch?). On p14 of the manual it says it
should be 6.0 bar - can i just check the Schraeder valve on top of the
vessel with a car-tyre jobbie, and if it's less than 6 bar, try pumping
it up?

Thanks
David



Additional note:

P5 says the pre-charge pressure on the expansion vessel should be 4 bar.

THe 6 bar reference on P14 is the cracking pressure of the Expansion
Relief Valve.

Pump the thing up to 4 bar cold.

--
R