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Ignitor OHMs

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Shouty
Shouty Member Posts: 2
in THE MAIN WALL
Does anyone have a chart with the range of OHMs for ignitors? Can't seem to find anything on Google. 

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  • Ironman
    Ironman Member Posts: 7,376
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    What type of igniter are you referring to?

    Since the electrode is solid metal, I would expect there would be no resistance.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Ironman
    Ironman Member Posts: 7,376
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    Or are you referring to a hot surface igniter?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Shouty
    Shouty Member Posts: 2
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    Hot surface ignitor. Sorry, I should have been more specific. 
  • Ironman
    Ironman Member Posts: 7,376
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    I’ve never tried to ohm out one, nor heard of that approach. If it heats up and has no visible cracks or defects, then I’d assume it’s good.
     
    Some older furnaces also used it as the flame sensor and had issues doing that. They switch to using a flame rod and made a retrofit kit for that.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Tim McElwain
    Tim McElwain Member Posts: 4,621
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    The Room Temperature Resistance (RTR) for a Model 201 is 45 to 400 ohms, the 271 is 45 to 75 ohms those are Silicon Carbide Igniters. The Silicon Nitride Igniters are less resistance around 8 to 20 ohms.
  • mattmia2
    mattmia2 Member Posts: 9,637
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    HSI ignitors act as PTC termistors so the cold resistance is much lower than the power rating and ohm's law would predict.

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