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Help wiring a taco s501

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  • Help wiring a taco s501

    I need to wire a taco s501 relay to operate a second circ pump and zone valve for a radiant zone.....there are 2 wires (rd/white) from the tt state in the room and there are 4 wires (grn/bl/rd/wh) going to the boiler and zone valve can anyone explain how I wire the 4 wires to the S501 relay....thanks

  • #2
    Re: Help wiring a taco s501

    You cant use a 501 for zone valves....It would have to be an Taco ZVC403 atleast.

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