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Posted by Pete on September 15, 2006 at 09:12:23:
I have a Weil-McLane hot water boiler...three zones. The pump moves water away from the boiler through the air scoop to to the zone valves. An unusual piping job was done a few years ago to facilitate the air scoop being installed (original setup did not have one), so the pipe actually makes a big horse-shoe shape (comes up out of the top of the boiler goes 90 degrees out about 24 inches, then 90 degrees up about 12 inches the back ninety degrees to the pump and then the airscoop...they wouldn't fit with out the arrangement) This piping makes it a little "unstable" physically.
Last year when I was done heating it was all fine. I just fired it up to make sure all is well and I saw some things that make me concerned. #1 While heating (once temp reached about 160 degrees) there was a slight shake noticed in the piping that comes out of the boiler. It quits once heating is finished and didn't shake during just pump circulation. #2 While the shaking occurs the pressure needle on the gauge bounces (up and down about 3 lbs). My cold pressure is about 12 lbs and at the highest point it reaches about 15 lbs or so. Help would be appreciated.