1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

Garn sediment problems

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by Kemer, Feb 22, 2013.

  1. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I posted before that I was using up my anode rods and now I think they are causing me other problems.I noticed my performance declining on my garn 1500.so I checked my y strainer and sure enough it was blocked with a white residue.I have a 50 plate exchanger.my water temp is 170* but on the other side of the exchanger it is only 120*So my question is
    Do I take it to a radiatior shop or try to clean it myself?
    Does anyone know of a cartrage type filter that would work and not restrict flow.I'm short on room as I would have to replace the y strainer with the filter.
    Any other suggestions would be appreciated.

    Helpful Sponsor Ads!





  2. nt30410

    nt30410 Member

    Joined:
    Dec 13, 2007
    Messages:
    17
    Loc:
    New Brunswick Canada
    Kermer;

    I don't have a heat exchanger but I do have a Garn 1500, I do have white specs caught in my strainer and I did replace my anodes after 41/2 years. So you are not alone on that one.


    Regards
  3. TCaldwell

    TCaldwell Minister of Fire

    Joined:
    Oct 26, 2007
    Messages:
    526
    Loc:
    860-868-9014 h 203 948 0864 c nw corner ct.
    Last week during the cold spell, I noticed a reduction in supply temps from the pressureized side of the hx from the garn. I removed the hx, white filmy residue coating the garn side, I flushed both sides with a hx scale remover from the plumbing supply house. Cleaned screens and reinstalled, what a difference, consistent a and b hx temps at 4deg differential, not the 15+ before. I went through 2 sets of anode rods before mike from precision told me to run without them as the water tested good. I think it would be a good idea to clean hx at least once per year after seeing this.
  4. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    My water always tests good. I sure would like to not keep buying anode rods.Do you think it's safe not to?
  5. Bob Rohr

    Bob Rohr Minister of Fire

    Joined:
    Jan 9, 2008
    Messages:
    737
    Loc:
    SW Missouri

    The anode rods serve the purpose of protecting the boiler. If they are eroding away they are doing their job. Running without could move the corrosion potential to the boiler. Any dissimilar metals in the system that could be setting up electrolysis. Brass and galvanize (zinc) could be an issue.
  6. Sawyer

    Sawyer Minister of Fire

    Joined:
    May 17, 2008
    Messages:
    599
    Loc:
    Northern WI
    Hey Harry, what do your anode rods look like when they are gone? Is the core that they are coated on still visible and all the magnesium is gone? when i checked my Y strainer last spring there were only a few specks of white, seemed like mineral or particles from my start-up like undissolved soap crystals.
  7. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    George the only thing left is the center core The stuff in the strainer looks like a white paste.
  8. TCaldwell

    TCaldwell Minister of Fire

    Joined:
    Oct 26, 2007
    Messages:
    526
    Loc:
    860-868-9014 h 203 948 0864 c nw corner ct.
    Yeah, looks like wall paper paste, clean the hx and your temps will return
  9. DaveBP

    DaveBP Minister of Fire

    Joined:
    May 25, 2008
    Messages:
    1,055
    Loc:
    SW Maine
    How about a bypass filter system. A hot water rated filter shunted across the circulator pump so a small fraction of the water passes through it, not the whole flow. Eventually, after numerous burn cycles, the suspended crap is almost all caught in the filter. After that you should have clear water.

    Anyone do this? I know they aren't cheap.
  10. jebatty

    jebatty Minister of Fire

    Joined:
    Jan 1, 2008
    Messages:
    4,339
    Loc:
    Northern MN
    I have a hot water filter on the boiler side of the plate hx serving the radiant floor. Reason for the hx is for antifreeze in the floor loop and water in the boiler/1000 gal storage. Take a look at these:

    http://www.waterfilter-usa.com/hot-water-filter.php?id=HT10&gclid=CIXToqP11LUCFYZcMgodulMAzA
    http://www.freshwatersystems.com/p-6056-rusco-hot-water-spin-down-filter-systems-1-14.aspx

    The 160F rating on the waterfiler-usa probably is OK due to the low pressure in a boiler/garn system. I have one that has a metal housing. It rarely collects anything of interest any longer.
    Tennman likes this.
  11. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I have been looking at the rosco.I'm going to clean it today then install filter
  12. jebatty

    jebatty Minister of Fire

    Joined:
    Jan 1, 2008
    Messages:
    4,339
    Loc:
    Northern MN
    Is depletion of the anode rod and sediment clogging the strainer or hx caused by the same processes or are the sources of these different? Why is the Garn equipped with an anode rod and other boilers and/or steel tank storage systems not equipped with anode rods? Is galvanic corrosion which an anode rod is supposed to trap identifiable as present in a system not equipped with an anode rod?
  13. Sawyer

    Sawyer Minister of Fire

    Joined:
    May 17, 2008
    Messages:
    599
    Loc:
    Northern WI
    GEA spells out cleaning & filter requirements.
  14. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I'm cleaning it with white vinegar now and seeing an improvment.anybody know how long to let it soak?
  15. Sawyer

    Sawyer Minister of Fire

    Joined:
    May 17, 2008
    Messages:
    599
    Loc:
    Northern WI
    I do not know how long to soak as I have not cleaned mine yet as temperature differentials are similar to when I first installed it. This way I can learn from you Harry. ;)

    Are you seeing particles as you circulate or is the water turning cloudy?
  16. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I knew I had a problem when I cleaned my strainer and it was blocked with white paste
  17. DaveBP

    DaveBP Minister of Fire

    Joined:
    May 25, 2008
    Messages:
    1,055
    Loc:
    SW Maine
    So what is this white stuff everyone's seeing? Is it some zinc compound precipitate?
  18. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I think it's the magnesium from the rod
  19. TCaldwell

    TCaldwell Minister of Fire

    Joined:
    Oct 26, 2007
    Messages:
    526
    Loc:
    860-868-9014 h 203 948 0864 c nw corner ct.
    thats why mike advised me not to run more rods, as the water was in check, the magnesium ends up in a pile in the bottom of the boiler and the turbulance of the water circulation carries and coats the system. Did the vinegar do the trick, I used a over the counter hx cleaner, circulating it through with a sump pump and bucket, total time was about a hr. i am afraid that with the mag in suspension, cleaning will be needed more frequently.
  20. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    Yes the vinegar worked..I still have a 14* differance so I might use sizzle.I have a easy set up for flushing like yours.
  21. Sawyer

    Sawyer Minister of Fire

    Joined:
    May 17, 2008
    Messages:
    599
    Loc:
    Northern WI
    How Close do you want to get the A in/B out differential. Wouldn't pump flow and demand make a difference between systems. I have always had a 10-12* differential, do you think this is cause for concern?

    Attached Files:

  22. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I think your right.Pump speed and demand would make a differance I would be happy with a 10* spread
  23. RowCropRenegade

    RowCropRenegade Feeling the Heat

    Joined:
    Mar 19, 2008
    Messages:
    302
    Loc:
    Southwest, Ohio
    I haven't cleaned out my HX since it was installed. I'm within range of what you guys are seeing.... 10-12 degrees difference. This number narrows the faster the pump runs (variable speed pump).

    I was told to clean the HX with acid...planning to do it this summer.
  24. Kemer

    Kemer Member

    Joined:
    Feb 26, 2008
    Messages:
    213
    Loc:
    Northeast Pa
    I did another cleaning with white vinegar and was very pleased with the results.I'm reading a 8* difference now
  25. Sawyer

    Sawyer Minister of Fire

    Joined:
    May 17, 2008
    Messages:
    599
    Loc:
    Northern WI
    Big difference Harry! What are your supply/return temps now for A & B?

    How did you circulate the vinegar?

Share This Page