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Posted by HeatPro on May 24, 2006 at 22:27:04:
In Reply to: Re: copper tube boiler groaning/vibrating posted by Dave on May 24, 2006 at 18:50:58:
"The 0010 pump is pumping into the inlet of the boiler (abouta foot from the inlet)"
The inlet gauge is vibrating. As the only thing that would cause the gauge to vibrate is something that could vibrate, it is probably the circulator making pulses into the boiler - perhaps dirt in the impeller or other problems? Nothing else moves.
The thermometer is miscalibrated or bad.