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Air vent

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nate379
nate379 Member Posts: 37
Is an air vent mandatory for a closed loop system?

The white pex goes to an expansion tank.


The whole se
Mad Dog_2

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  • nate379
    nate379 Member Posts: 37
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    Not my handy work, it was thrown in to replace a dead Baxi unit so the sale would go through.

    And actually was plumbed better.  The original setup had no 2nd pump and just was piped boiler output to the floor manifold and floor return right to the boiler return.

    The rest of the pex is dhw that's cobbled together.
    Mad Dog_2
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,106
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    Hi, do you mean an "air scoop" or Air Eliminator like a Spirovent or Caleffi?  Not required by and codes I know of, but its ALWAYS recommended on Hydronic systems.  Mad Dog
    nate379kcopp
  • hot_rod
    hot_rod Member Posts: 22,258
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    Air purger at the boiler, a manual or auto type float vent at any high point. Air comes out of solution as the water is heated. If not removed it goes back into solution as the boiler cools. Efficiency drops when air, not water is in contact with the boiler and heater surfaces.
    Within air is oxygen, which leads to the corrosion of the ferrous metals, often creating magnetite
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • nate379
    nate379 Member Posts: 37
    edited March 2023
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    Highest point is the boiler.  Where would the vent even go?  The whole setup is showing in the pic minus an expansion tank hooked to the pex headed left over the floor manifolds.

    They used non O2 barrier pex, so vent probably needed even more?
  • hot_rod
    hot_rod Member Posts: 22,258
    edited March 2023
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    Often times the boiler has a high point vent inside. Remove the cover and take a look.

    Once you are do e working on the system get a can of Rhomar or Fernox conditioner to squirt in. The will help some for preventing corrosion with non barrier tube
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • nate379
    nate379 Member Posts: 37
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    I'll have to see if there are available here.  F1 is available online, but can't ship to AK it seems. (Hazmat?)
  • nate379
    nate379 Member Posts: 37
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    Put a new pump, tons of magnetic black filings in the flush water from??

    Not sure if it's free if air, boiler has no vent.

  • HVACNUT
    HVACNUT Member Posts: 5,863
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    Not sure about your model but the VRP shows an internal air vent.

    nate379