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Taco ZVC406-EXP & Smart Thermostats

john p_2
john p_2 Member Posts: 367
edited October 2019 in Gas Heating
Looking to install wifi thermostats on my older Taco zone control panel and need to know where to locate my Common wires. I attached a pic showing where I believe they should go...

Comments

  • HVACNUT
    HVACNUT Member Posts: 6,335
    Yes you can get your Common at that C terminal.
  • HomerJSmith
    HomerJSmith Member Posts: 2,635
    The R & C should be on the same transformer. Maybe this diagram will help you. It came to me from the engineers at Nest.
  • john p_2
    john p_2 Member Posts: 367
    No I'm more confused...I thought common wire was the negative lead....do I need to jump the R & C wires in the thermostat?
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,214
    You will fry your transformer if you add that jumper.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • john p_2
    john p_2 Member Posts: 367
    Allan , thanks was pretty sure of that.

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