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Posted by Dave on January 22, 2007 at 15:27:07:
In Reply to: Re: Size expansion tank posted by HeatPro on January 22, 2007 at 14:56:31:
: 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.
I can add a little water to bring the cold/lower pressure up higher but then the higher pressure will be above 20. I thought the pressure should never exceed high teens when hot. Is it Ok for it to rise to 20 something when hot? As long as it is less than the 30 psi relief is that OK? What SHOULD the "normal" swing be? It's a Peerless WBV04, total capacity of the entire system is close to 30 gallons (glycol).
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