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Circuit board needed

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zepfan
zepfan Posts: 477
in Geothermal

Does anyone know of a generic circuit board that I can use to re control a mid 90's Hydro Heat geothermal unit. The main circuit board in the unit after thirty years failed and from what I can tell the company was acquired by Enertech, but most of the oem parts are no longer available.

I rewired it today so the customer would have cooling, however I am looking for a board that will provide lock out should one of the pressure switches trip, and freeze protection. I would also need the freeze sensor or freeze stat. The unit already has the pressure switches. I was hoping ICM or some other manufacturer makes one that I can use. Managing the pumps, reversing valve and aux. heat is easy, it is basically lock out, and freeze protection that I am looking for. Thanks to all

Comments

  • mattmia2
    mattmia2 Posts: 17,987

    might need to just get a couple terminal strips and wire it as a safety chain controlling a couple contactors.

  • 109A_5
    109A_5 Posts: 4,361
    edited 9:52AM

    What is wrong with the original board ? There are places that can possibly repair it. Here are two examples

    http://hvac-circuit-board-repair.com

    https://www.upfix.com

    I have not used them, I do my own component level repair work. Often it is just loose connections (connector pin fitment), crimped connections, bad solder joints, failed relay contacts and/or bad capacitors.

    Have you looked on ebay, for a used or new old stock replacement board ?

    Other possible solutions.

    White-Rodgers 47D01U-843 Defrost Control Board Heat Pump Universal

    ICM2812 universal integrated furnace control.

    White-Rodgers 50M56X-843 universal single-stage HSI integrated furnace control
    White-Rodgers 50D50U-843 Universal All-Spark Ignition Module
    White-Rodgers 50F06--843 Universal Furnace Electronic Fan Timer

    Another idea is a small Programmable Logic Controller (PLC) or Programmable Logic Relay (PLR) (AKA known as a smart relay or mini-PLC) but solutions like that may become time consuming to set up and program.

    If you supply a good picture of the board (both sides) and the model of the unit, maybe a good picture of the wiring diagram, I may be able to come up with more ideas. Although information for a vintage unit may be limited.

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

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