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  #61  
Old 06-07-2013, 10:52 AM
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Quote:
Originally Posted by Wet_Boots View Post
the 24 VAC transformer will always show 29 - 30 volts when you measure it, because it isn't running under the full load the transformer is rated for - load it down, and the voltage drops (and the solenoids aren't a full load, so actually seeing just 24 volts is unlikely to happen)
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


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  #62  
Old 06-07-2013, 11:54 AM
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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.
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  #63  
Old 06-07-2013, 01:54 PM
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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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  #64  
Old 06-07-2013, 10:07 PM
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Quote:
Originally Posted by Wet_Boots View Post
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.
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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Old 06-07-2013, 10:11 PM
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it's a Triad F-116X
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  #66  
Old 06-07-2013, 11:32 PM
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Very reasonable prices
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  #67  
Old 06-08-2013, 02:40 PM
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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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