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    Pressure rising to 60psi (13 Posts)

  • Steve Garson Steve Garson @ 3:46 PM
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    Pressure rising to 60psi

    I had to replace a leaking expansion tank last week on a radiant heating system. I installed a new one with a 20psi charge and charged the system to 20psi. The water-feed valve was then shut off.

    A few days later, I saw the pressure gauge reading of 60psi. Puzzled, I drained around 2+ quarts of water and the pressure went back down to 20psi.

    Today, the pressure was high again, so I drained some more. The water temp varies from 100* to 140*.

    This all seems wrong. What is happening here?

    Thanks,

    Steve Garson
    Boston, MA
    Steve from Newton, MA
  • icesailor icesailor @ 3:49 PM
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    Leaks:

    There's a leak from the high pressure (Potable, Street) side to the lower pressure, closed heating side somewhere. A indirect coil most likely.
  • Steve Garson Steve Garson @ 4:11 PM
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    Leak

    That makes a lot of sense. This is my second Combicore. It is perhaps five years old. I wish my contractor installed a small boiler, instead. Any suggestions on the smallest boiler available>

    Steve
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 4:11 PM
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    Leak

    That makes a lot of sense. This is my second Combicore. It is perhaps five years old. I wish my contractor installed a small boiler, instead. Any suggestions on the smallest boiler available>

    Steve
    Steve from Newton, MA
  • RobG RobG @ 4:02 PM
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    Relief valve

    On top of what Ice said, that relief valve shoud have never let the boiler get above 30 psi (unless it is a rare system that is rated higher). Check the relief valve as well.
    Rob
  • Steve Garson Steve Garson @ 7:09 AM
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    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:09 AM
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    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:09 AM
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    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:09 AM
    Contact this user

    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:09 AM
    Contact this user

    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:09 AM
    Contact this user

    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:09 AM
    Contact this user

    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
  • Steve Garson Steve Garson @ 7:10 AM
    Contact this user

    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
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