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hot water boiler

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hi, i have been working on this 3 zone hydronic boiler .
the relief valve is blowing by after it exceeds 30lbs. and then in reseats it self(as it is designed to do) . the temp.controler is set for 180degree's ,which it is maintaining. i just recentlly replaced the water regulator. and the relief on the water make up line is not blowing . what do you think may be causing the system to over pressures and blow the relief periodically like this ?.

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  • J. Reid
    J. Reid Member Posts: 9
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    check expantion tank-it may be waterlogged or undersized
  •  jimmy moyen
    jimmy moyen Member Posts: 2
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    relief valve blowing

    you were right .thanks it was the expansion tank ,jimmy
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