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Stat for a thermistor

Stat for a thermistor

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Thread: Stat for a thermistor

  1. #1
    Join Date
    May 2013
    Posts
    1,465

    Default Stat for a thermistor

    Can a thermistor be replaced with a cycling stat on a dryer?

  2. #2
    Join Date
    Feb 2012
    Location
    Canada
    Posts
    2,330

    Default

    Nope, will show/look as a shorted thermistor to the board.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  3. #3

    Default

    A thermistor is a variable resistor whose resistance depends upon it's temperature. The resistance may vary with temperature from a few thousand ohms to a few tens of thousands of ohms. A control board monitors it's value and uses that to determine air temperature. A cycling thermostat is just a switch, it's closed or open, depending on temperature.

  4. #4
    Join Date
    May 2013
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    Default

    I understand that. I just really do not understand the advantage of the thermistor over the stat unless it is just necessary when an electronic control board is used.

    I'm guessing it has something to do with saving energy.

  5. #5
    Join Date
    Feb 2012
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    Canada
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    Default

    I'm guessing it has something to do with saving energy
    For sure....and for extracting more money from the consumer when the system fails.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  6. #6
    Join Date
    May 2013
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    Default

    On these two I have that do the same thing, blow the thermal cut-off which is rated around 352 or there about before opening the high limit stat rated at around 248 (?), could something shorting somewhere else cause this? For example one has a heat relay, could it be shorting or something and causing this?

    The seals look go to me on this particular dryer.
    In my simple mind, I just cannot understand why the cut-off is blowing before the high limit stat when they are in the same horizontal cage even if there is a 3 piece band a block away connected by wire to it with the band leader standing on his left foot facing east. But the power is going to the cut-off first. That has to have some kind of bearing, right? This is why I bring up the possibility of the relay on the one or some other part causing this.

    This thing didn't heat 10 minutes with a load in it and the vent tube stretched across the floor toward the outside with no blockage.

    I mean even if the thermistor was not cutting off, if the heat in the heater cage got too high, shouldn't the hl stat open before the cut-off blows, if it is just heat causing this regardless why the heat is excessive?

  7. #7
    Join Date
    Feb 2012
    Location
    Canada
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    2,330

    Default

    Heating element thermal cut-off (thermal fuse) 309 degrees and high-limit thermostat 250 degrees, with wiring kit.
    Whirlpool (OEM) Part #279816

    Heating element thermal cut-off (thermal fuse) 360 degrees and high-limit thermostat 250 degrees.
    Whirlpool (OEM) Part #279769

    I just cannot understand why the cut-off is blowing before the high limit stat when they are in the same horizontal cage
    In a perfect world, you are correct, the safety should open up before the fuse opens up....unless the element is grounded/grounding.

    could something shorting somewhere else cause this? For example one has a heat relay, could it be shorting or something and causing this?
    Operating thermostat, relay can certainly allow the dryer to get too hot, but again, in a perfect world, the safety should open up before the fuse opens up.

    That was suppose to be it's job.
    No name parts not being the correct rating?

    Heat rises, this style -may- be more susceptible to the fuse opening up...

    Stat for a thermistor-dryercomponents2-jpg

    Stat for a thermistor-wp_electric_dryer_short_element_small-jpg

    The cut out on the floor style heater is definitely farther into the heat than the safety thermostat is...

    Stat for a thermistor-whirlpool-dryer-lint-filter-door9-jpg

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

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