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Thread: Radiant Floor Heating

  1. #31
    Join Date
    Feb 2018
    Location
    N CA
    Posts
    1,279
    Water quality in a hydronic closed loop system is usually not an issue as you have a specific vol of water and as it gets heated whatever is in the water precipitates out and that is that. There isn’t enough crap in it to affect the system. If you have constant refreshment of the water in the system however, that can become an issue depending upon what is in the water to begin with. If you are on a municipal system you can call the water board and they will send you the break-down. On a well? Get a water test. Also, system deterioration typically shows at the source of ignition, which is where the temp increase drives the breakdown of the water. As to the condensate, you can neutralize it. They are readily available or you can make your own with a bit of pvc. Fill it with limestone chips and it will be neutralized. The outfit that sold you the gear should have offered it as an option. They are readily available on-line. If you make your own, use the largest diameter pvc you can get your hands on. That way you do not have to be replacing the medium all the time. Do you have oxygen barrier pex? Your system will operate better if you move that expansion tank.
    Last edited by Jack Frederick; 01-27-2021 at 12:28 PM.

  2. #32
    Join Date
    Feb 2018
    Location
    N CA
    Posts
    1,279

    Why move the expansion tank?

    Referring to your photo of the system the highest pressure drop in your system is not your radiant tubing, but your tankless. Going back to my copy of "Pumping Away," Dan states that you want your expansion tank at the point of "no pressure change" in the system. In Your system that would be below your Spirovent on the suction side of the pump. Get a couple 1/2" brass nipples and 90's and lay that thing off to the left. As you are currently piped you are pumping toward the X tank and against the head of the tankless. That causes a negative pressure on the inlet side of the circulator. Nature abhors a vacuum and nature will win by introducing air into the system and the system pressures will be all over the place. If you put the XT on the Spirovent you will allow the circ to increase the system pressure by the pressure of the circ and the XT will sit quietly and do its thing. You should see stabilized system pressures in operation too.

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