disabling thermal sensors on a fan

[govtcheez75]

My cousin's Dell just died on her. I replaced the case and motherboard and took off some stuff that I thought I could use. I noticed a nice NMB 92mm fan, but noticed that it has a thermal sensor built in similar to the sensor seen on this picture.. I read some specs on this fan, and it's pretty impressive. Very quiet at low speeds with decent airflow and blows very hard at high speeds with pretty moderate noise. I want to control the fan using my fan controller, but I think the thermal sensor is keeping me from cranking the speeds up. It says that it automatically adjusts to full speed if the temperatures are over 55 degrees.

...is there a way to disable the thermal sensor so that I can control the fan speed with my rheobus/fan controller?

 

[JBDan]

Yes it is possible....don't know how you would go about it on a thermistor such as the one you linked (too short), but with a fan that has a thermistor "wire" on it you just cut it off, expose wire, and solder them together. Heatshrink on top of that. If you want to you can even throw a resistor in there. The thermistor in your pic link is so tight in there (unless there is a wire thermistor in there)....no room to work. Can you find that particular NMB fan anywhere online to purchase?

 

[JEDIYoda]

The problem would be even if you cut the wire off you would still have something inside reading the temps!!
Because to remove it completely you would need to take the fan completely apart!!

I wouldn`t recommend cutting and soldering the 2!!!

I would probably just purchase another fan and leave this one intact!!

Good Luck!!

 

[Zepper]

I have a 120x25 mm NMB Smart Fan. I just stripped and tinned the end of a piece of wire long enough to jump the thermistor and tack-soldered it across the thermistor. On mine, the thermistor is mounted to a piece of PCB that is also visible with the solder joints of the thermistor right up front. It was easy as pie and my fan controller does a great job with it. Thermistors are OK on exhaust fans, but irrelevant for intake fans.
. My Smart Fan does 120CFM at full speed (at 750mA!) - it howls pretty good when you crank it up full and is very quiet when turned down to a reasonable level. This NMB is also quite different in that the fan rotates clockwise - most of this type fan rotates counterclockwise to the direction of air flow.
. I hate to name my sources on the AT Forums as they would probably all be gone when I need some in the future...

.bh.

 

[Jhhnn]

Wrap a piece of very fine bare copper wire across the leads to the sensor, so as to short the leads together. It's a thermistor, so resistance goes down as temp goes up...

 

[JBDan]

Originally posted by: JEDIYoda
The problem would be even if you cut the wire off you would still have something inside reading the temps!!
Because to remove it completely you would need to take the fan completely apart!!

I wouldn`t recommend cutting and soldering the 2!!!

I would probably just purchase another fan and leave this one intact!!

Good Luck!!

?? Why wouldn't you recommend cutting them and soldering them together? That is how you accomplish what he is wanting to do. Where do you get your info? lol

 

[govtcheez75]

Originally posted by: JBDan

Originally posted by: JEDIYoda
The problem would be even if you cut the wire off you would still have something inside reading the temps!!
Because to remove it completely you would need to take the fan completely apart!!

I wouldn`t recommend cutting and soldering the 2!!!

I would probably just purchase another fan and leave this one intact!!

Good Luck!!

?? Why wouldn't you recommend cutting them and soldering them together? That is how you accomplish what he is wanting to do. Where do you get your info? lol

Would that work? I think I can handle that. It sounds like the easiest solution so far.

 

[JBDan]

Yes it will work, but as I stated, from the looks of that link you posted, if your NMB's thermistor is exactly like that one, it will be tough to do. No "working room" to play with. If the thermistor is a wired one (meaning hanging out of the motor housing) it is very simple.

 

[govtcheez75]

Originally posted by: JBDan
Yes it will work, but as I stated, from the looks of that link you posted, if your NMB's thermistor is exactly like that one, it will be tough to do. No "working room" to play with. If the thermistor is a wired one (meaning hanging out of the motor housing) it is very simple.

Thanks...this worked like a charm, and it was VERY easy. No "working room" actually helped, since i didn't have to try to solder a piece of wire on there. I just cut off the thermistor and soldered the two tips together.

LINK TO MY PICTURE.


...thanks again!


*edit* Now I see what all the fuss about the Tornado fans are. This thing is loud, but at full load, cools 5-6 degrees better than the fan it replaced on my XP-90.

 

[JBDan]

Sweet! Glad it worked for you.