Disabling built-in thermal control in fan

JBS

Member
Dec 19, 2007
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There is a Sanyo Denki fan I'm interested in (model 109R1212T1H162), however it's a thermally controlled fan with a built-in thermistor, which I don't want.

Is it at all possible to remove or disable the built-in thermistor, or no.

Also, if I can't disable the thermistor, what would happen if I hooked the fan up to a fan controller. Would the fan controller setting overide the thermistor?
 

daw123

Platinum Member
Aug 30, 2008
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Take a gander at this.

Essentially, you need to do the following to get the fan running at full speed permentally:
Temporarily short across the contacts of the thermistor with a screwdriver whilst the fan is connected to a PSU to check if the fans ramps up to full speed.
If the fan runs at full speed using the screwdriver trick, cut the thermistor out and solder a wire across where the thermistor was connected.
 

JBS

Member
Dec 19, 2007
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If I left the thermistor alone and just hooked the fan up to a fan controller, do you know if that would let me control the fans speed myself. Or would the thermistor still control the fan in some way. thanks
 

WildW

Senior member
Oct 3, 2008
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evilpicard.com
A fan controller would still cut down the volts going to the fan. . . but the fan would still have a heat-controlled variable resistor in there doing its thing, so it would still slow down. . . just moreso.