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Pressure rising to 60psi

Steve GarsonSteve Garson Posts: 596Member ✭✭
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
·

Comments

  • icesailoricesailor Posts: 7,265Member ✭✭✭✭
    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.
    ·
  • RobGRobG Posts: 1,677Member ✭✭✭
    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 GarsonSteve Garson Posts: 596Member ✭✭
    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 GarsonSteve Garson Posts: 596Member ✭✭
    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 GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
  • Steve GarsonSteve Garson Posts: 596Member ✭✭
    No relief

    Just noticed...no relief valve on heating loop. Only on potable hot water side. Unbelievable!
    Steve from Newton, MA
    ·
This discussion has been closed.

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