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Posted by HeatPro on May 05, 2006 at 21:44:46:
In Reply to: Well Mcclain boiler and indirect water heater posted by John on May 05, 2006 at 20:48:34:
The pipe is there to allow water to cycle in the boiler to prevent condensation. A radiator valve in the boiler block closes when the water is warmed.
As you say you changed THE CIRCULATOR, make sure you have TWO circulators there. One is for the recirculation inside the boiler on the 1/2-inch line, the other or others is/are to pump water through the rest of the system zones. If you are trying to use the recirculator that is on the 1/2 line inside, it is not meant to heat the home or water heater; you'd need another one to do that with zone valves.
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