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Posted by HeatPro on February 14, 2005 at 14:17:42:
In Reply to: heavy breathing (no banging) valves posted by Rich R on February 14, 2005 at 00:29:36:
It is often normal for a system to do that when properly sized. The way the boiler Hartford Loop is piped and the water level can produce this. Check the main vent to see if it is partially clogged, so water in the main can surge. Also check that there is no dirt or oil floating on the boiler water level.