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Visionpro th8320u t-stat question

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gerry gill
gerry gill Member Posts: 3,078
in Thermostats and Controls
of the visionpro t-stat..what is the criteria for the second stage to be activated? i can't seem to find it in the info on line..is it a time delay?or a temperature drop?both? once the second stage is activated, does it stay on till setpoint is reached? or just till a certain portion of the temp drop is reclaimed? this t-stat has the best installation guide i'd ever seen but is vauge in feature details..thanks

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  • carol_3
    carol_3 Member Posts: 397
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    The staging is done by a technology called proportional + integral (P+I)> That's just a fancy way of saying that it takes into account both time away from setpoint and temperature away from setpoint. The stat factors the two together with an algorithm (fancy word for formula). What it comes down to is if either factor is extreme, or if the combination of the two is significant, the stat will bring on second stage. I think it stays on both stages until the end of the call for heat, but I could be wrong on that.
  • gerry gill
    gerry gill Member Posts: 3,078
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    thanks Carol

    i appreciate the info, it helps..

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    gwgillplumbingandheating.com
    Serving Cleveland's eastern suburbs from Cleveland Heights down to Cuyahoga Falls.

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