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vision pro thermostats

Nron_9 Member Posts: 237
haveing some problems with the new thermostats getting them to run the fan only on a unico system . it came with an update to control the system fan from the th. but it doesnt seem to work does anyone have the electrical drawing for the system using the new directions this would help ar Ill have to wait untill tuesday as monday is a hoiliday here


  • A.J.
    A.J. Member Posts: 257
    check the subbase

    Sorry no wiring diagram but make sure you have it in the right designation on the subbase one is for furnaces and the other is for heatpumps.
    I'd just check for 24 volts at the handler coming back from the stat before you work on the stat. Sometimes it isn't that we think.
  • Maine doug_13
    Maine doug_13 Member Posts: 3
    Is this what you are looking for?

  • Wayco Wayne_2
    Wayco Wayne_2 Member Posts: 2,479

    Does Unico still use a sequencer as a time delay fan relay??? If so the extra amp draw of the heater coil in the sequencer could be the issue. Add an isolation relay so the coil will draw directly from the transformer and the problem will go away. (if that's the case) WW

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  • Steve Ebels_3
    Steve Ebels_3 Member Posts: 1,291
    I ran into that

    Couple years ago on a Unico we installed. It's not a T-stat issue, it's a Unico issue. Seems like I had to add a relay or something. I just remember that I had a really bad day when I did the low voltage wiring on that thing. I was using the unit for heating and cooling and something with the fan relay was giving undesired results until I added another relay to split the heating and cooling inputs from the stat. I also remember a looooonnggg phone call to Unico whilst getting the thing to behave as a good heating system should. As much static as I raised with them about it, I would have thought they had straightened the problem out by now.
  • Nron_13
    Nron_13 Member Posts: 164

    they might have the system was installed 2 years ago and its taken that long to do the wood work in the house itsa 3700 sq/ft bungalow and the highest gas bill was $136.00 for 1 month in the last year the heating system was running fan continuous and is heated by a Viessmann Vitola boiler , I here that Viceroy wants the system featured in their new catalog for their homes .just installed the oak outlets and have to finish balancing the system .
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