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Posted by HeatPro on January 22, 2007 at 14:56:31:
In Reply to: Size expansion tank posted by Dave on January 22, 2007 at 14:03:32:
Rising only to the teens indicates that the expansion tank is already larger than necessary
the gauge is broken. Make sure it isn't by using a know-good gauge off the boiler drain valve.
A 'normally' sized expansion tank would allow the gauge to rise to about 22 lbs at most from 12-15 psig.
I don't know why the pressure is only 3 psig to start with, that is 'abnormal' to start, unless ALL the piping is LOWER than the boiler.
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