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Posted by HeatPro on May 23, 2006 at 21:13:39:
In Reply to: Re: copper tube boiler groaning/vibrating posted by Dave on May 23, 2006 at 19:23:15:
Most likely, because the expansion tank bladder pressure was set too high, there was no reserve of water in it to keep the volume completely water, so air was drawn in the vent when the pressure dropped below 18 psig to 10 psig. You'll need to make sure the expansion tank is set several pounds lower than the minimum fill pressure so there is water reserve.
Leaving the pressure reducing valve open has the hazard of not adjusting the expansion tank and minimum pressure correctly, so every time the system cools it draws in more fresh water and pops the relief when the system heats again, dumping antifreeze. To many plumbers a pressure reducing valve is an automatic fill valve. It is more often an automatic good water waster.
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