In an earlier contribution to this discussion,
DaveŁ wrote:
On Sun, 24 Oct 2004 19:54:11 +0100, "Set Square"
wrote:
1 bar = 14.5 psi - so, for 0.7 bar, you'll need just over 10 psi
[10.15 to be exact - but I doubt whether your pressure gauge
measures fractions of a psi]
SS, Thank you for your help again. One thing I'm not clear about: At
what pressure should the heating system water be when I pump the
expansion vessel to 10psi? And, should the boiler be tuned on or off
during this operation?
Dave L
You must pump up the pressure vessel with the heating system cold and
un-pressurised. At this point, the pressure vessel will be completely filled
with air at 0.7 bar. *Then* use the filling loop to pressurise the system to
around 1 bar, cold. *Some* water will enter the pressure vessel (on the wet
side of the diaphragm), and will compress the air a bit more - but still
leave plenty of expansion potential. When the system is hot, it shouldn't
get to much more than 2 bar if everything is working correctly.
--
Cheers,
Set Square
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