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Posted by HeatPro on January 18, 2010 at 11:49:19:
In Reply to: Still Overpressure please help posted by joe on January 18, 2010 at 08:53:46:
Three possibilities:
You have a very large system with much water, so the EA-60 isn't large enough: Solution:
http://www.heatpro.us/designtree/
You have a tankless coil inside the boiler that is leaking slowly.
http://www.heatpro.us/tanklesstree/documents/36D2A287A1836140D25E42896F83EF81603B6233.html
Repair or replace.
As the pumps are on the return, they add to the system pressure by the expansion tank, as they are not "pumping away" as recommended by boiler manufacturers since 1920.
http://www.heatpro.us/multctree/index.html
OR a combination of the above.