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Radiator's not bleeding water

nivedx
nivedx Member Posts: 4
We've just turned our system on and wanted to bleed the air out of the units all of our 1st story units bleed air then water, on the 2nd story the units bleed a little air but no water no matter how many times we bleed the units and they only heat up about half way up the radiator. Also the PSI is at 5 which seems low but I don't know much about radiant heat.

As far as I know it's an HB Smith g210-s-4c0n
I've attached some images of the boiler system

https://imgur.com/ay5cOtD
https://imgur.com/AEZrvXP
https://imgur.com/nq9yopO
https://imgur.com/t2wux3N
https://imgur.com/lznNGHU

Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 5,688
    First of all, you can add the photos into your post.
    I always use my reliable stand alone gauge to make sure the boiler gauge is correct, many times they are not.
    You'll need to get the pressure up by adding more water to the system. I'd get it up to 20 psi. Let one person bleed and the other person stay at the boiler and keep the pressure up. Your boiler feed appears to have a fast fill.
    When your done, drain some water from the boiler to get it down to 12 psi cold.
    steve
  • nivedx
    nivedx Member Posts: 4
    What do you mean stay at the boiler to keep the pressure up? What does the person at the boiler have to do?
  • STEVEusaPA
    STEVEusaPA Member Posts: 5,688
    edited October 2019
    Just make sure the pressure stays up at 20 until you're done bleeding. If you get on the second floor, start bleeding, and your pressure drops down below 12-15, you'll be introducing air back into the system.
    Sometimes the auto fill can't keep up, which is when you would lift the fast fill lever.
    Keep in mind sometimes when the fill adds water to the boiler, it doesn't seat properly and may continue to fill, then over fill the boiler.
    It's the fill pressure (static pressure) that lifts the water to the top of the system. The circulator just moves it around.
    Important, make sure the system is off when filling/bleeding. No circulator(s) running.
    steve
  • JohnNY
    JohnNY Member Posts: 2,917

    Contact John "JohnNY" Cataneo, Master Plumber for Consulting Work
    Or for plumbing in NYC or in NJ.

    Or take his class.
  • nivedx
    nivedx Member Posts: 4
    thanks for the help guys was able to get the pressure up and bleed out the radiators upstairs
  • STEVEusaPA
    STEVEusaPA Member Posts: 5,688
    Don’t forget to check the pressure once in a while.
    steve
  • nivedx
    nivedx Member Posts: 4
    I brought it back down to around 12psi (system was cold) what range should I be looking for while it's hot?
  • STEVEusaPA
    STEVEusaPA Member Posts: 5,688
    If your expansion tank is properly sized and working, it shouldn’t drift up much more than 15 psi.
    If it goes up much higher, that would indicate other issues.
    steve