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Expansion Tank

LionA29
LionA29 Member Posts: 255
in THE MAIN WALL
I have a basement hydronic heating zone and wanted to know what PSI the expansion tank should be set at?
Amtrol model 30
Thank you for your help.

Comments

  • hot_rod
    hot_rod Member Posts: 25,073
    The pressure in the tank needs to be checked and adjusted before you connect it to the system. The pre-charge pressure will be the same as the pressure that you operate you system at. typically 12 psi is fine for residential homes 3 stories or less.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    LionA29
  • LionA29
    LionA29 Member Posts: 255
    edited March 2016
    @hot rod ,It is an existing installed tank, not new.
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,872
    Then you need to bleed the system pressure to 0 PSI, then check and adjust pressure, then recharge system. If water comes out of the schrader valve, you tank has failed and needs to be replaced.

    Fill pressure is based on system height above the boiler, (1/2 PSI per vertical foot of elevation) and then add 5 PSI to that figure,and adjust the expansion tank t match that figure. Typical 2 story house = 12 PSI.

    ME
    LionA29

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