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joshuajim's avatar
joshuajim
Explorer II
Nov 18, 2015

Thermistor adjustor range

I have the dial type of thermistor on my Dometic 2652 RBX refer for about a year now. It doesn't seem to have any effect on the refer temp anymore. It measures 0 ohms on the warmest setting and 700 ohms on the coldest setting. This does not seem like enough as the thermistor test range is from 7000 to 10000 when in ice water.

It would seem that only adding 700 ohms to my thermistor which measures in the 8400 ohm range would be enough to vary the temp.

Any thoughts.

4 Replies

  • Chris_Bryant's avatar
    Chris_Bryant
    Explorer II
    Nov 18, 2015
    joshuajim wrote:
    Chris Bryant wrote:
    36 degrees is 8347 ohms, 33 degrees is 9101 ohms. Here's the chart of values for Dometic standard models.


    Thanks for the chart. Am I mistaken that domestic states that the ice water check of the thermistor should be in the 7k to 10k range. Given that, the refer could vary between 30 and 42 degrees with different thermistors.


    That 7K to 10K figure is given really more for a rough guide- they normally just work or are bad.
  • joshuajim's avatar
    joshuajim
    Explorer II
    Nov 18, 2015
    Chris Bryant wrote:
    36 degrees is 8347 ohms, 33 degrees is 9101 ohms. Here's the chart of values for Dometic standard models.


    Thanks for the chart. Am I mistaken that domestic states that the ice water check of the thermistor should be in the 7k to 10k range. Given that, the refer could vary between 30 and 42 degrees with different thermistors.
  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Nov 18, 2015
    Quicksilver has a stainess steel 5-watt thermistor with a 10-turn pull down pot wired counterclockwise. The pot is OUTSIDE the reefer right alongside the refrigerator/freezer LED thermometers and alarms. Opening the door, removing top shelf items, heating the refrigerator to 50F just to tweak the temperature seems so, so, Cro Magnon.

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