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Posted by Dave on May 22, 2006 at 19:47:49:
In Reply to: Re: copper tube boiler groaning/vibrating posted by HeatPro on May 22, 2006 at 10:42:38:
: I surmise that the needle vibrating on the circulator inlet is an indication of cavitation (changing state from water to steam and back again), which was what probably killed your 0012. It is a flow rate problem in that circuit, again, more likely related to not having a balance valve to set the resistance on the outlet side of the circulator
+++Why would this problem happen now after 4 months? There have been many times where just the DHW is on because the system is set to priority for DHW. So even in the winter, when the call comes for DHW, the other zones shut off. So why now would we be getting this noise when all winter, even with just that small radiant floor loop running, we had almost complete silence?
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