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Posted by HeatPro on December 09, 2007 at 00:00:22:
In Reply to: Re: 2 issues, possibly related... posted by Greg on December 08, 2007 at 20:19:13:
"until the circulator turned on, then it read a few psi (say 4) lower... I figure that's to be expected as it was upsgtream of the circulator..."
That can be the cause of your relief valve dripping. If the pressure reducing valve is located near the point where the pressure drops it can add water at that point when the pressure drops. The relief then dumps water from excess, then the pressure drops making it add water ... repeatedly.
This is the way the boiler should have the circulator related to the expansion tank and fill.
http://www.heatpro.us/designtree/documents/D37EBB4E971C5ED50E12874F284D63720B2F92DC.html
I'm in south New Jersey.