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Control needed

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zepfan
zepfan Member Posts: 486
in A-C, Heat Pumps & Refrigeration

does anyone have a suggestion on an in expensive controller, brand doesn’t matter that can be powered with 24vac, accepts a 10 k sensor (supply air) that has two normally open contacts? Make on temperature rise. One contact is necessary, but two stages (two contacts) would be preferred. I need to temporarily get a 100% OA unit working until the OEM controller can be installed. It is an older unit and the controller while still available has a long lead time. Thanks to all

Comments

  • hot_rod
    hot_rod Member Posts: 28,250

    pretty much all electronic setpoint controls are multi voltage and available as multi stage

    They come with a sensor, not sure if it can be switched

    Ranco, Honeywell, Penn, Johnson Controls are some of the brands

    Choosing heat or cool is what differentiates break on rise or fall

    IMG_3332.jpeg
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    zepfan
  • 109A_5
    109A_5 Member Posts: 4,376
    edited 3:24AM

    Omron may have something you like.

    https://automation.omron.com

    Many temperature controllers out there.

    Many modern temperature controllers you can pick the temperature monitoring device from a menu like NTC Thermistor, Thermocouple (J, K, other), RTDs, etc.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • 109A_5
    109A_5 Member Posts: 4,376

    Sadly the Ranco unit above does not specify the electrical characteristics of the sensor it uses.

    " accepts a 10 k sensor (supply air) " Using an existing sensor may have unexpected results.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • 109A_5
    109A_5 Member Posts: 4,376

    I think the TSS2-2400 checks all your boxes, you will have to program it .

    TSS2-2400
    Dual stage temperature switch, °F, 24 VAC/DC.

    Dwyer-Omega

    LOVE CONTROLS DIVISION
    www.love-controls.com
    DWYER INSTRUMENTS INC.

    image.png

    https://assets.dwyeromega.com/manuals-do/TSS2_Instruction_Manual.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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