Ultra 230-4 outdoor sensor

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heaterbeater
heaterbeater Posts: 2
in THE MAIN WALL

Is the outdoor temp sensor the same resistance profile as two indoor ones? The book is unclear . Thanks.

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  • 109A_5
    109A_5 Posts: 4,759
    edited March 5

    Troubleshooting section. All the same resistance chart. Probably a 12K at 77F (25C) degree Thermistor.

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    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
    Big Ed_4
  • hot_rod
    hot_rod Posts: 28,705

    I’m pretty sure they are. Take an indoor one. And connect it to the outdoor sensor connection and see what it reads.

    There would be a chart for the outdoor sensor if it was a different resistance profile.

    Tech support at Weil should know for sure.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • heaterbeater
    heaterbeater Posts: 2

    Thanks .I hope you're right.

  • Big Ed_4
    Big Ed_4 Posts: 3,585

    Instal the sensor and check the readings .. Instal the outdoor sensor NW corner not over a window or heat source ..

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