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Radiant Floor System Losing Pressure

Derheatmeister
Derheatmeister Member Posts: 1,579
in THE MAIN WALL
PIX may help

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  • nedjinski
    nedjinski Member Posts: 4


    I have a basic 1 zone / 6 loop radiant under floor heating system.
    ever since day one the system will lose pressure over time.
    when I pressurize the system to let's say 15 PSI and let it sit, it will stay pressurized when not running, but once the system starts up it will gradually lose most of the pressure over a few days.
    there are no fluid leaks anywhere - checked many times. there is a taco air separator inline but if that was leaking then fluid would leak out.
    any thoughts?
  • SpeyFitter
    SpeyFitter Member Posts: 422


    How old is the system? The air separator could be doing its job. Venting the entrained air out of the system as the fluid is circulated. Depending on the system this could take days or weeks. When air is removed the pressure decreases. The fluid must be circulating for the air separetor to work.

    There was an error rendering this rich post.

  • Ed_26
    Ed_26 Member Posts: 284
    pressure loss

    Do you have an expansion tank?
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