I guess I don't understand Rain Bird panel - valve hum & transformer hot

Discussion in 'Irrigation' started by gdeangel, May 20, 2013.

  1. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,858

    I just measured a pro-C and 2 walwarts @ 121.2 vac and they all measured 26.2 - 27.3 resting.

    Just saying.

    I am on my way to a locate right now, i will pull some numbers and post them

    :waving:
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  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,468

    Wallwarts are not necessarily actual 24VAC transformers with a true 5:1 turns ratios. Of course, back when, there was never anything smaller than a full 40 VA step-down transformer used. (note that electro-mechanical controllers using 24VAC timing motors would have a dropping resistor in series with the timekeeping motor) I have a teensy weensy 24VAC class 2 transformer, obtained for an experiment - maybe it shows a lower open-circuit voltage, too.
     
  3. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,858

    L-1 to L-2 = 27.5
    L-1 to G = 1.6
    L-2 to G = 24.4

    Found the valves (3 of them) and left in 2hrs, headed to troubleshoot a pump.
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  4. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,858

    what make is the teensy weensy transmitter Toots?

    i would like to get one and do some of my own experiments.
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  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,468

    it's a Triad F-116X
     
  6. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,858

    Very reasonable prices :clapping:
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  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,468

    I should amend my description, since that small transformer isn't class 2. There are some class 2 transformers that small, though.
     

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