Digital Johnson trouble

Discussion in 'Homebrewing' started by inchrisin, Aug 21, 2013.

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  1. GreenKrusty101

    GreenKrusty101 Initiate (0) Dec 4, 2008 Nevada

    I'm showing my age...110, 220, and 440 circuits used to always have mechanical contactors
     
    #21 GreenKrusty101, Aug 22, 2013
  2. WickedSluggy

    WickedSluggy Savant (1,129) Nov 21, 2008 Texas

    http://wiki.embeddedcc.com/index.php/SSR_Recommendation

    I'm just assuming that most all modern temperature controllers use these. I use an array of SSRs (solid state relays) in my system controlled by an embedded control concepts controller (BCS460). I have 120V relays for pumps and some 240V for water heater elements. The micro side is 5V DC
     
    #22 WickedSluggy, Aug 22, 2013
  3. ventura78

    ventura78 Pundit (972) Nov 22, 2003 Massachusetts

    I've installed a number of these with good luck. Get one that has an adjustable differential. If you shop around you can find this for about $90 new, cheaper used. I wouldn't set your differential for 1 deg., (4 or 5 is better. )It could make the compressor come on too often and may cause it to go off on internal overload.


    http://www.amazon.com/JOHNSON-CONTROLS-A19BAC-1C-Thermostat-Range/dp/B00DAI2VTW
     
    #23 ventura78, Aug 23, 2013
  4. inchrisin

    inchrisin Pooh-Bah (2,013) Sep 25, 2008 Indiana
    Pooh-Bah



    I'll set it to 2. I can get a 3 degree range with frozen 2 liters and a tupperware bin. Otherwise, there's no point in using a fridge.
     
    #24 inchrisin, Aug 23, 2013
  5. ventura78

    ventura78 Pundit (972) Nov 22, 2003 Massachusetts

    A fridge is easier to use than the bin. The point is that for what you are doing, a critical setting of 1 or 2 isn't necessary. That is usually reserved for specialized laboratory applications. Domestic refrigerators shouldn't cycle that often.
     
    #25 ventura78, Aug 23, 2013
  6. JohnSnowNW

    JohnSnowNW Initiate (0) Feb 6, 2013 Minnesota


    That is why the Johnson Digital controllers come with an Anti-Short Cycle Delay function.
     
    #26 JohnSnowNW, Aug 23, 2013
    inchrisin likes this.
  7. inchrisin

    inchrisin Pooh-Bah (2,013) Sep 25, 2008 Indiana
    Pooh-Bah

    Yup, it happened again last night. I got a temp on the 1/2 growler full of starsan (blowoff water) and it was way down in the 50's. The Readout was all over the place around 95-101F. I shook it and the fridge continued to run. So frustrating.
     
    #27 inchrisin, Aug 24, 2013
  8. ventura78

    ventura78 Pundit (972) Nov 22, 2003 Massachusetts

    I had the same thing happen recently to my red bull fridge. I replaced the digital control system with the control I mentioned a few posts above this one. Hopefully it will be more dependable. ( so far so good ):slight_smile:
     
    #28 ventura78, Aug 26, 2013
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