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Posted by Harold hydronicnetwork.net on December 28, 2003 at 18:17:04:
In Reply to: banging posted by e burke on December 28, 2003 at 16:26:33:
Steam heating without banging is a matter of the right timing. A new boiler steams much faster than an old boiler, so there is much more water in the returns in a shorter time than when the old boiler was there. The Gorton #2 valves allow the steam to fill the returns completely, so there is probably more water than before and it bangs as it reboils and hits the incoming steam. The lengthening of the thermostat cycling was partially necessary because the new boiler does steam so quickly.
Although it won't make the banging return work better, try removing the main vent from that run and plugging or capping the vent riser to see what happens when the radiators alone have to vent the main there more slowly. If it stops some of the banging, then a smaller main vent opening or a ball valve almost completely closed below the replaced vent to slow the venting might help.