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Heat Treat Math

Discussion in 'Heat Treating' started by Gary Ferrer, Apr 20, 2022.

  1. Gary Ferrer

    Gary Ferrer New Member

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    Hi. Long story short, I melted my Hubert HT oven and have re-wired as follows: Original setup was 4 30 ohm coils (top, bottom, LHS, RHS). Bottom coil is toast and I don't want to replace it for obvious reasons. In sort, circuit from the factory had 2 coils in series in parallel with 2 other coils in series giving an effective resistance of 30 ohm to the 240v line (in reality, it's a bit more complicated as there is a low/med/high switch that the SSDx2 pass through). So for now I ran LHS and RHS coils in series and then in parallel with the one top coil giving me an effective resistance of only 20 ohm (if I did my math right). The result is that both LHS and RHS coils are very dim and the top coil is nicely lit up. My thinking is to put a 30 ohm 2kw resistor in the circuit to replace the bottom coil in order to restore the original circuit resistance and current draw. If I'm right about that, I'm not sure how to pick this resistor?
    PS: Current draw across single coil is 8A
    Thanks, Gary.
    (PS: Can't figure out how to insert image for wiring diagram).
     
  2. Vladimir

    Vladimir New Member

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  3. Gary Ferrer

    Gary Ferrer New Member

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    Thanks. I'm trying to avoid putting in a new coil. It's not an easy job on this one and coils ain't cheap either.
     

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