Ohio Help identifying an item

Discussion in 'Maintenance and Troubleshooting' started by jeryb, Jan 28, 2019.

  1. jeryb

    jeryb New Member

    My sons home has a FHP GO036 unit in a closed loop system that was installed in 1986, there are some issues that I need to sort out with it.

    In the return line there is a 3" x 4ft long piece of pvc with a cap on the top and 2 pvc T's on the bottom, the return line comes in the bottom and then exits out 1 of the T's, the upper 3" x 4ft piece has a fitting in it that I do not recognize.

    I am thinking that this is some type of makeshift expansion tank ? and was wondering if anyone else had ever seen something like this.

    The whole configuration is very basic as there is no flowcenter, nor any P/T ports etc.

    I'll try to upload some pics.

    Thank you,

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    Last edited: Feb 2, 2019
  2. Calladrilling

    Calladrilling Member Industry Professional Forum Leader

    What are we guessing? The plug or the whole set up????
  3. jeryb

    jeryb New Member

    Any information you can offer. If it is some type of homebrew expansion tank perhaps that fitting was there to air it up ?
    It just doesn't look like any commercial product.
  4. waterpirate

    waterpirate Well-Known Member Industry Professional Forum Leader

    My money is on a home brewed air separator/expansion chamber to keep pressure in the system and air out of pumps.
  5. arkie6

    arkie6 Active Member Forum Leader

    If you want us to figure out what it is, you need to show us the whole thing, top to bottom. Are there any similar fittings or valves at the very top of the column? But it appears to be an expansion chamber and a way to separate air from the water as previously stated. It definitely looks homemade. That small metal fitting on the side may have been a way to either add or bleed excess air out of the chamber, i.e. open it until water comes out then you know the water level is that high in the column with the remainder being air. With air in the upper part of the chamber, this effectively becomes an expansion tank which is able to accommodate small changes in water volume due to changes in temperature without having a significant effect on the system overall pressure.
    Last edited: Jan 30, 2019
  6. Calladrilling

    Calladrilling Member Industry Professional Forum Leader

    Better pictures showing the entire set up would be needed.
    It sure does look like a “homeowner special” design.
    I would also agree on some sort of a air separator, or some attempt to purge air.
  7. jeryb

    jeryb New Member

    That is what I believe it is, but was surprised to see it on such an old system.
  8. jeryb

    jeryb New Member

    I hope to get out there in a week or two and will try to get a better picture. There are no other fittings and the one that is on there is nothing I'm familiar with. In the center of the fitting inside there is about an 1/8" square piece. You would have to get in there with a pair of needle nose pliers to see if it turns or not. The fitting is on an angle and there is no sign of any type of sealer or anything around it.
  9. geoxne

    geoxne Active Member Forum Leader

    That fitting looks like a radiator bleed valve. They could be using it to check water level and or as a drain???
  10. arkie6

    arkie6 Active Member Forum Leader

    Last edited: Feb 2, 2019
  11. jeryb

    jeryb New Member

    Good call ! That is what it is. Just goes to show you how easy it is to forget about things when the grey matter starts creeping in between your ears. I will have to see if I can find my key, I used to keep it on my key ring. The supply house used to give them out for free and the last time I used it was in the late 70's

    I'm attaching the layout of the system that I drew up last nite.

    Thanks again guys !

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