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T-Stat wiring question

John T_3
John T_3 Member Posts: 34
in THE MAIN WALL
I currently have my 750mv boiler and my 24v AC running on the same t-stat (honyewell VisionPro) The steam boiler is on R and W, and the AC is an Rc and the other correct terminals. The jumper is removed form R and Rh. All is working.

Question:

Can I cun the 24v common from my AC to the t-stat to power it? Or will this not work since the R is hooked up to the millivolt. Any thoughts? It works fine on the batteries, but would rather power it from the 24volt if possible.

Thanks!

Comments

  • mikea23
    mikea23 Member Posts: 224


    will work fine if common comes from AC unit wont work if from boiler

  • Unknown
    Unknown
    brian

    I had a similar issue, Vision Pro stat, air-handler/w heating coil/pump, A/C(in same), DHW tank, toggled with a Taco SR 503, boiler located in out-building with radiant.
    Things don`t come to me like they used-to, but I eventually figured-it out(after 3 electricians tried), so don`t feel bad.
    These digital stats are not as simple as the "old-lads"!

    Dave
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