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Converting 1962 Huppert's Delux Furnace Model 236dl 240v, 7.5a

Discussion in 'Forges, Ovens, Kilns, & Salt Pots' started by Gary Ferrer, Feb 6, 2021.

  1. Gary Ferrer

    Gary Ferrer New Member

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    Hi everyone. I recently bought at auction a 1962 heat treat oven (wasn't cheap). Paid $500 for it. It's really heavy and looks very well built. The temp display stopped working and wasn't reliable even while it worked. I'm wondering if I should just replace the thermo couple with a type S or K and keep using it as is or just do a modern PID conversion? There are 4 independent elements in the furnace wired as per schematic attached. Can anyone with experience chime in and let me know your thoughts?

    Cheers, Gary.

    (PS: site is telling me uploads are not available! so can't post pictures. Is this normal?)
     
  2. dancom

    dancom Dust Maker

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    Hi Gary,

    1962 is very likely all electromechanical (relays) that switch the coils. I would replace the electromechanical controls with solid state relay(s), a PID controller and a thermocouple. Type K being most readily available.

    Yes, you will need to have your files or images on the internet somewhere, Imgur or Google Drive for example, and point to them from the forum here. If you can't get the upload to work, drop me an email: knives@dknives.com. I wouldn't mind seeing the schematic.

    How are the coils themselves? They do age and need to be replaced from time-to-time. Once the coils have been fired they can become brittle, so you may plan on replacing the coils if you are going to do a control overhaul.

    Cheers,

    Dan
     
  3. Gary Ferrer

    Gary Ferrer New Member

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    Hi Dan. I tried emailing you at that address and I get an imedate 'Mail delivery subsystem' failure, Address not found. I don't have access to 3rd party image storage other than iCloud.
     
  4. dancom

    dancom Dust Maker

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