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Posted by HeatPro on February 13, 2006 at 13:50:09:
In Reply to: bleeding radiators and pressure tanks and pressure relase valve posted by gman1964 on February 13, 2006 at 12:02:57:
A pressure-relief valve that drips constantly at only 20 psig is a problem. After a year of a steady stream in most areas, the fresh water coming in can lime the bottom of a boiler over an inch and can clog elsewhere with water hardness. The fresh oxygen coming in whit the water will also corrode any ferrous metals, like the boiler and the pumps. You want to have a system that has no leaks when the manual valve leading to the pressure reducing valve is closed to prevent liming and corrosion leading to a new boiler in a few years.
http://64.226.150.132/hydronic/service/purgeair.htm