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Pressure Valve

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Rdriver
Rdriver Member Posts: 15
in Radiant Heating
IMG_7797.jpeg

hi folks. The pipe out of the furnace feels hot and is draining. Expansion tank was recently replaced. Should I replace the pressure valve?

image.jpg image.jpg

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 27,414

    Somewhere on that boiler there is a pressure gauge… what does it read?

    There are a number of reasons why the pressure relief valve could be operating, none of them good. But one really needs to know what pressure the system is running at to start figuring out which possibilities to look at…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    ethicalpaul
  • Rdriver
    Rdriver Member Posts: 15

    here’s a picture of the pressure gauge on the boiler and also the pressure gauge for the radiant floor heating pipe. When these pictures were taken in the System was not running.

    IMG_7841.jpeg IMG_7842.jpeg IMG_7843.jpeg
  • Rdriver
    Rdriver Member Posts: 15

    @Jamie Hall I should’ve thanked you earlier for your response

  • Jamie Hall
    Jamie Hall Member Posts: 27,414

    No problem. That cold pressure is fine. Is the pressure relief valve dripping when the system is cold, or only when hot? And if it is when hot, what is the pressure when it is hot? You say the expansion tank is new, but I wonder if it was correctly precharged?

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Intplm.
  • Rdriver
    Rdriver Member Posts: 15

    what’s the symptom of an incorrectly precharge expansion tank? The folks who installed the expansion tank are coming out again tomorrow to replace the pressure valve, but I’m suspicious.

  • Rdriver
    Rdriver Member Posts: 15

    here’s a picture of running and hot

    image.jpg
  • Rdriver
    Rdriver Member Posts: 15

    here’s a sound I get when typing the expansion tank not sure if that helps

    I guess I can’t attach a video, but it doesn’t sound hollow

  • Jamie Hall
    Jamie Hall Member Posts: 27,414

    Somethings off — the temperature in the second photo of the gauge is the same as in the first…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 20,259

    That gauge could be bad. When they go they usually indicate temperature ok but the pressure is wrong .

    Either way I would put a pressure gauge on a drain valve so you can figure it out.

    Lyle {pheloa} Carter
  • hot_rod
    hot_rod Member Posts: 27,545

    How hot does the boiler run? Check pressure at the highest temperature. 180 maybe?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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