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3-wire thermostats with Argo or Taco relay?

JohnNY Member Posts: 3,226
Thanks in advance.

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  • Mitch_4
    Mitch_4 Member Posts: 955
    What control are you using (ARGO)


    I use a ton of the ARGO controls...aht one are you using?
  • Big Ed_4
    Big Ed_4 Member Posts: 2,687
    Just drop one wire......

    There are two three wire systems out there. There was the old series 10 was used before they put heat antisapaters in the thermostats a cerramic disk heater was in the thermostat. W&B was the contact circuit and R supplied power to the heater. On this drop the Red

    Then you had a zone valve set up like the Flair. It was power open and power closed. It did not have a close spring. They used the cooling contact of the thermostat to close. You drop the power close wire. Don't remember the code but I think Rwas the line and W was power open.
    I have enough experience to know , that I dont know it all
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