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Posted by HeatPro on May 22, 2006 at 09:45:06:
In Reply to: Re: copper tube boiler groaning/vibrating posted by Dave on May 22, 2006 at 06:02:12:
More often, it is one of the circulators running at a 'tuned' circuit condition. As it never happened before, it could be the lowered 10 lb pressure affected a circulator.
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