My replumbing project

warno Posted By warno, Nov 11, 2018 at 9:36 PM

  1. warno

    warno
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    Jan 3, 2015
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    To anyone still watching this thread that could help me out.

    Is there any way to prevent ghost flow other than a zone valve? In my situation a check valve won't work because of direction of flow.

    Here's the situation. When my storage to FPHX circ is running, charging storage, it's pulling water through my garage heating loop because the way the storage headers are plumbed. Last year this wasn't a problem because I wasn't following nearly the amount of gpm I am now. With this new plumbing the flow rate is almost 3 times more.

    Here's some pictures for visual aid.

    Blue line - supply from storage to FPHX
    Red line - return from FPHX to storage
    Orange line - garage loop supply
    Green line - garage loop return

    Screenshot_20181203-165315_Gallery.jpg

    So is there any other option than to put in a zone valve to block flow?
     
  2. BoiledOver

    BoiledOver
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    Wondering if a trap would work, similar to kitchen sink drain. Come out of the red line (in your photo) horizontally, then down with a 90° to begin the trap. No knowledge or experience of how far south to go, easy and inexpensive if it works.
     
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  3. Bad LP

    Bad LP
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    The only guaranteed way I'm aware of is with a zone valve. My primary house was plagued with ghost flow through the zone pumps. We added check valves and that was a useless exercise. Rewired the zone manager and added valves and it has been trouble free for years.

    A dropped trap works great on a water heater.
     
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  4. warno

    warno
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    The good thing is I already have a zone valve actuator from a diverter valve I had in place last year and the valve body is only $35 from supply house. Do I guess I'll just go that route and be done with it. Thanks guys.
     
  5. TCaldwell

    TCaldwell
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    Just be aware of the added head pressure of a zone valve, the do make electronic ball valves.
     
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  6. warno

    warno
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    That loop is pretty short with fairly low head loss. But I'll look into an electronic ball valve. Thank you
     
  7. warno

    warno
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    Jan 3, 2015
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    Just another little update. I'm not 100% sure I was getting ghost flow through my garage loop. I started a fire yesterday and couldn't feel the supply line changing temperature at all while storage was charging. I'm thinking/ hoping it was simply a coincidence and that my garage loop just got done with a heat cycle when I felt it the other day.

    On a side note I do believe the new plumbing and bigger FPHX are working. The boiler stays ahead of the storage by 10° or better. At least until the storage hits about 165 then the temps start to balance out. This morning my storage was at 170 and my boiler shut down at 172. I checked deltas last night and they were only around 2-3° on both sides when boiler and storage were reaching the 170 mark.
     
  8. cumminstinkerer

    cumminstinkerer
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    Feb 2, 2016
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    By george I think you got her man, good to hear, now if I can just my storage in and have it work that well, still have to dream up a couple switches and relays and of course get the tank before I tackle it. Maybe I will through that issue out on a new thread of my own
     
  9. BoiledOver

    BoiledOver
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    That is fantastic news, so happy for you. Stay warm my friend.
     
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