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Posted by HeatPro on September 27, 2007 at 12:21:42:
In Reply to: Main Vents posted by Boston on September 27, 2007 at 11:25:38:
First. Make sure there is a working vent 1-1/2 feet from the end of the main beyond the last radiator on the main, so the air can leave the main quickly. Make sure that main vent is on a nipple 8 inches above the main so water doesn't splash into the innards. That way, the radiator that is gurgling doesn't act like the main vent and have to vent all the air in the main before you get heat in the other radiators.
Then check to make sure the pressure control is set to turn the burner off below 2-1/2 lbs, so there isn't excessive pressure to drive water up into that radiator that gurgles. Contrary to 'logic' raising the pressure will not increase the speed of heating the system, because pressure above 3 pounds closes off the air vents on the radiators and can damage them.
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