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Thread: Milk bulk tank

  1. #1
    Join Date
    Jul 2011
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    N.E. Ohio
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    112

    Milk bulk tank

    One of my customers wants a replacement control for his bulk tank. He has replaced three Johnson A19ABA-40C Remote bulb temp controls in about a year and a half and would like to try a different brand. The only condition I can find that would shorten the life of these is the high humidity at times in milk houses, but the there is no noticable corrosion. Any ideas or suggestions would be appreciated. I like selling controls, but I'd like to try to help him get a little longer life out of them. John

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
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    6,360
    Quote Originally Posted by tinnerjohn View Post
    One of my customers wants a replacement control for his bulk tank. He has replaced three Johnson A19ABA-40C Remote bulb temp controls in about a year and a half and would like to try a different brand. The only condition I can find that would shorten the life of these is the high humidity at times in milk houses, but the there is no noticable corrosion. Any ideas or suggestions would be appreciated. I like selling controls, but I'd like to try to help him get a little longer life out of them. John
    What is the brand and model of the tank?
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
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  3. #3
    Join Date
    Nov 2009
    Location
    Saskatchewan
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    492
    How are they mounted?

    The screw pattern on the base can screw those up.
    It twists the base and they go a bit wacky. What is in the well for heat transfer?

  4. #4
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    Jul 2011
    Location
    N.E. Ohio
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    Thanks for the replies. I'll get that info and post in the morning. John

  5. #5
    Join Date
    Jul 2011
    Location
    N.E. Ohio
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    The tank is a Mueller Model No. 10, S/N 20676 , 500 Gal. The present control is mounted with one screw and the probe slides into a U shaped strap or slot so it touchs the bottom of the tank. The probe was somewhat oxidized, so I cleaned it and we'll see what happens. I'm not really in the refrigeration business, (HVAC & Plumbing), but I'd like to help this customer if I can, since he's also a good friend and neighbor. Thanks again for any advice anyone may have. John

  6. #6
    Join Date
    Dec 2011
    Location
    Michigan
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    119
    I don't know about milk tanks. I do know refrigeration. Is the stat pulling in the compressor directly or operating a relay? Occasionally I have seen when an OEM remote bulb stay is replaced with a stock stat off the truck. The problem is not all stats are created equally. Make sure the stat can handle the amp load going through it.

    Good luck

    Sent from my amazing 4G device

  7. #7
    Join Date
    Jul 2011
    Location
    N.E. Ohio
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    112
    Thanks btack. I'll check that. I haven't worked on this unit before, so the off the truck part is a strong possibility. The stat is wired to a panel that controls a diesel powered compressor (its an Amish dairy). John

  8. #8
    Join Date
    Sep 2005
    Location
    florida
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    5,504
    Quote Originally Posted by btack View Post
    I don't know about milk tanks. I do know refrigeration. Is the stat pulling in the compressor directly or operating a relay? Occasionally I have seen when an OEM remote bulb stay is replaced with a stock stat off the truck. The problem is not all stats are created equally. Make sure the stat can handle the amp load going through it.

    Good luck

    Sent from my amazing 4G device


    A Mueller 500 gal tank the t-stat will be pulling in a contractor.
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  9. #9
    Join Date
    May 2012
    Location
    Stephensville, LA
    Posts
    12
    Just a thought, any chance the sanitation acids used in the milk house for wash down and tank cleaning are damaging the capillary tube when they drain off?

  10. #10
    Join Date
    Feb 2009
    Posts
    134
    What part of thermostat is failing if it is the points it is possible that it is a DC control circuit requiring snap action points to avoid burnout.

  11. #11
    Join Date
    Nov 2008
    Location
    Altamont, IL
    Posts
    373
    I just recently replaced one with an Emerson/ White Rodgers electronic control. I don't like the clamp to the bottom of the tank for the bulb. I used a piece of copper to take up the extra room in the clamp and insulated it well. Now we've eliminated the cap tube and wet/ chemical problems corroding the control. The electronic also has an adjustable offset so you can calibrate it to the milk actual temp. It has a probe temp digital display and a setpoint display . It's been working fine. Let's not even get into the flooded evaporator and subcooling valve on those Muellers.
    In GOD We Trust

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