Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Heater - Stripped exchanger drain plug

  1. Back To Top    #1
    carlos31820's Avatar
    Join Date
    Nov 2010
    Location
    Midland, Georgia
    Posts
    345

    Heater - Stripped exchanger drain plug

    I have a Jandy Legacy 250 natural gas heater. On the left side of the heater, there is a polymer/plastic threaded drain plug (part 43 in the diagram below). I have partially stripped this drain plug and now water squirts out whenever the pump is running. I have it holding right now by using some teflon tape. I'm about to order a replacement plug hoping its the plug itself and not the polymer housing on the heat exchanger. If a new plug doesnt do the trick, is there a way to fix this short of glueing the plug permanently in? I live in Georgia and dont close the pool for winter so I dont really have a need to drain the exchanger.



    16x36 Vinyl Pool - 22.5K gallons.
    Jandy Stealth 1hp pump - Jandy CS-150 filter
    Jandy Legacy 250k heater - Jandy Ei SWCG
    Jandy Watercolors LED light
    Paramount Vanquish in-floor cleaner

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Heater - Stripped exchanger drain plug

    Getting the correct thread tap and carefully rethreading the hole often works. Doing this might also make things even worse, but you don't have much to lose at this point.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    CUTiger78's Avatar
    Join Date
    May 2009
    Location
    NoVA
    Posts
    460

    Re: Heater - Stripped exchanger drain plug

    I've got a Teledyne Laars 175K BTU NG unit with brass drain plugs. A couple of years ago, the pool closing company managed to strip the threads in the plug hole. My temporary solution was a cork. Bought a bag full in various sizes and crammed in the one that fit best. Worked so well (no leaks!) that I haven't actually repaired it yet.

    I realize that's shade tree mechanicing at best, but....

    Good luck!
    36K gallon 42X22 gunite/plaster kidney-shaped IG;
    1 hp Hayward Super Pump (new in 2012);
    Hayward S244T sand filter w/ Zeosand (both new in 2009);
    175K BTU LAARS Lite2 LG natural gas heater; Polaris 380;
    TF-100 test kit.

  4. Back To Top    #4
    gtemkin's Avatar
    Join Date
    Jun 2008
    Location
    Seattle, WA
    Posts
    738

    Re: Heater - Stripped exchanger drain plug

    It appears from the shopping site picture that the plug uses straight threads with an o-ring seal. The sealing is meant to be accomplished by the o-ring only, so as long as your threads can compress the o-ring well enough, you should be OK. If what really happened is you cross threaded the plug, and the o-ring isn't being compressed evenly, because the plug is tilted, then re-threading the header so the thread is straight would be a good approach. If the threads are so bad that there's very little plastic left to thread, then you could install a Helicoill or other brand threaded repair insert.

    Another, possibly simpler way is to use a test plug. These are sort of universal fit devices with expanding rubber bushings. Check out what Mcmaster-Carr has. I'd choose something that had a temperature range up to 250F.

    http://www.mcmaster.com/#expansion-test-plugs/=m8iirk
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

  5. Back To Top    #5
    carlos31820's Avatar
    Join Date
    Nov 2010
    Location
    Midland, Georgia
    Posts
    345

    Re: Heater - Stripped exchanger drain plug

    Right now it's been holding for two days by just putting teflon tape on the plug. Your test plug idea is genius, however. I was ready to epoxy that sucker in there for good. We don't close the pool here in west central Georgia.
    16x36 Vinyl Pool - 22.5K gallons.
    Jandy Stealth 1hp pump - Jandy CS-150 filter
    Jandy Legacy 250k heater - Jandy Ei SWCG
    Jandy Watercolors LED light
    Paramount Vanquish in-floor cleaner

  6. Back To Top    #6
    carlos31820's Avatar
    Join Date
    Nov 2010
    Location
    Midland, Georgia
    Posts
    345

    Re: Heater - Stripped exchanger drain plug

    Quote Originally Posted by gtemkin
    Another, possibly simpler way is to use a test plug. These are sort of universal fit devices with expanding rubber bushings. Check out what Mcmaster-Carr has. I'd choose something that had a temperature range up to 250F.

    http://www.mcmaster.com/#expansion-test-plugs/=m8iirk
    Im posting an update for anyone else who may have this problem. I also want to give credit to gtemkin for his brilliant suggestion to try a test plug.

    I ordered mcmaster part number 9191T33. It's a half inch 302 stainless steel plug rated to 250 degrees.

    It works perfectly. Photos below showing the test plug next to the original teflon-tape covered plug and an additional photo showing the test plug inserted in the heater.



    16x36 Vinyl Pool - 22.5K gallons.
    Jandy Stealth 1hp pump - Jandy CS-150 filter
    Jandy Legacy 250k heater - Jandy Ei SWCG
    Jandy Watercolors LED light
    Paramount Vanquish in-floor cleaner

  7. Back To Top    #7
    gtemkin's Avatar
    Join Date
    Jun 2008
    Location
    Seattle, WA
    Posts
    738

    Re: Heater - Stripped exchanger drain plug

    Glad it worked and you were able to find something that fit so well. I have an english car hobby, which demands an open mind to stopping leaks of oil, coolant, brake fluid and smoke (from wires ).

    Only caution I have is that the toggle clamp force not be too much because then you'd be putting a severe outward force on the plastic; but that's something you can judge fairly well when you clamp it and as long as you're not having to hit the lever with a hammer you're likely just fine for the long term.
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •