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Aquastat wiring, what is ZR & ZC used for ?

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  • Aquastat wiring, what is ZR & ZC used for ?

    I'm installing a new hot water boiler w/ tankless.
    I'm using 'L7224C' on a 'New Yorker'.
    Question; what is the ZR & ZC used for & how do they function ?
    I understand electronics.
    I've read & reread lit.
    Please Help.
    Thx.
    Matt

  • #2
    Re: Aquastat wiring, what is ZR & ZC used for ?

    I've only seen that aquastat installed on oil fired boilers. We don't have many of those here but I think it's used to activate a secondary relay for pumps or zone valves. Either by a NO or NC circuit.

    NHMaster or Duckbutter would know better than me

    I've also seen the ZC and ZR terminals used to activate alarms on larger boilers when they drop into failure mode.

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    • #3
      Re: Aquastat wiring, what is ZR & ZC used for ?

      The most common wiring is for ZC to power a second (or many) circulators with ZR used to provide low limit protection on terminal 5 or say an R845 switching relay.
      sigpic

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      • #4
        Re: Aquastat wiring, what is ZR & ZC used for ?

        Thanks for your timely response.
        I'm still looking for a more definitive answer.
        A pointer or link to where this info may be found would be great.
        Thanks again.
        Matt

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        • #5
          Re: Aquastat wiring, what is ZR & ZC used for ?

          Originally posted by majormatt View Post
          Thanks for your timely response.
          I'm still looking for a more definitive answer.
          A pointer or link to where this info may be found would be great.
          Thanks again.
          Matt

          ZC Stands for Zone control Like NH master said and ZR stands for Zone relays Like NHMaster said........definitive....Ummm maybe the insulators can help you??? I dont knwo just thowing that out there

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          • #6
            Re: Aquastat wiring, what is ZR & ZC used for ?

            If you are installing the boiler the wiring diagram for the L8124 should be in the package. If not go to honeywell's site, you can find it there.
            sigpic

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