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Taco SR503-4 relay

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heavenlyheating
heavenlyheating Member Posts: 4
in Thermostats and Controls
My question is, I installed the taco sr503-4 switching relay. The jumper that goes between ZC and ZR, do I have to install the jumper between those two terminals?

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  • HVACNUT
    HVACNUT Member Posts: 5,841
    edited November 2021
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    So I walked into WindowRama, went up to a bay window, and asked the sales rep "Will this fit in my wall?"
    Sorry.
    What model aquastat do you have? If it's "cold start", then yes, the jumper gets installed. If the boiler has a tankless coil, then ZR,ZC on the relay should get wired to ZR,ZC on the aquastat. 
    Did you have 3 separate switching relays and upgraded?
    Gas, oil, mod con? There are reasons you might want to delay the start of the circulators.
    STEVEusaPAEdTheHeaterMan
  • heavenlyheating
    heavenlyheating Member Posts: 4
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    it’s a taco SR503 switching relay, it had two separate relays and I installed the taco relay. I will install the jumper and see if that helps. Thanks for the advice 
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,852
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    Sometimes, even Heavenly People just can't take a joke!
    Or understand about the window of Sarcasm.
    Or answer the simple question about what aquastat is on their boiler.
    I hope the jumper works!
    Good Luck and Happy Thanksgiving.

    If it does not, then bring back more information Mr. HH

    Yours Truly,
    Mr. Ed
    Never Use The Parts Cannon.jpg

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    MikeAmann

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