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Posted by HeatPro on October 15, 2004 at 17:55:42:
In Reply to: Re:Increasing pressure/ Expansion tank posted by Neil on October 01, 2004 at 03:31:36:
a repair man came and tested the tank and said it was fine, also the pressure would increase only when the heating came on not when it was switched off and cool.
This means that the tank was fine (maybe); but it wasn't large enough. Read>
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http://64.226.150.132/hydronic/des/start.htm#Expansion