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dballin
Joined: 11 Nov 2007
Posts: 11
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 Posted: Tue Aug 23, 2011 4:58 pm Post subject: cooling fan thermostat |
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Anyone have an easy/elegant solution. I'd like to put a cooling fan
on my glare shield that exhausts the avionics when the temperature
gets over about 120. I figured some use of a thermistor, but need
some guidance. I already have an avionics fan, but in the Legacy at
least, it is nice to be able to exhaust hot air as well, but really
only want it on when needed.
Thanks
Dan Ballin
Legacy N386DM
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enginerdy(at)gmail.com
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| Posted: Tue Aug 23, 2011 5:30 pm Post subject: cooling fan thermostat |
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This is a 50C switch (122F) that should work for you:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=723-1192-ND
It's good for up to 1A and will reset at some point between 30C (95F) and 46C (115F).
It's unclear from the datasheet, but I think the mounting tab is not connected to anything, so you can screw that to some aluminum at the back of your panel, put a clip-on TO-220 heat sink on it to better sample the air temperature, or allow it to float in the air you're measuring.
If you use it, let me know how it works for you.
--Daniel
On Aug 23, 2011, at 7:55 PM, Dan Ballin wrote:
| Quote: |
Anyone have an easy/elegant solution. I'd like to put a cooling fan
on my glare shield that exhausts the avionics when the temperature
gets over about 120. I figured some use of a thermistor, but need
some guidance. I already have an avionics fan, but in the Legacy at
least, it is nice to be able to exhaust hot air as well, but really
only want it on when needed.
Thanks
Dan Ballin
Legacy N386DM
|
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pwmac(at)sisna.com
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| Posted: Tue Aug 23, 2011 5:37 pm Post subject: cooling fan thermostat |
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Search for a temp switch. The industurll ones are most reliable. Good
luck finding one lower than 150-180. Typicaly thery are for
automotive use. Small however. Just hang it close to the heat source.
PaulW
=========
At 06:55 PM 8/23/2011, you wrote:
| Quote: |
Anyone have an easy/elegant solution. I'd like to put a cooling fan
on my glare shield that exhausts the avionics when the temperature
gets over about 120. I figured some use of a thermistor, but need
some guidance. I already have an avionics fan, but in the Legacy at
least, it is nice to be able to exhaust hot air as well, but really
only want it on when needed.
Thanks
Dan Ballin
Legacy N386DM
|
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icubob(at)gmail.com
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| Posted: Wed Aug 24, 2011 2:41 am Post subject: cooling fan thermostat |
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i would think mcmaster-carr type places have inline thermostats for this. i have a thermostat off a woodburning stove that is wired inline to a motor that is controlled to go on and circulate air around the stove when the temp. goes up. same deal.
i guess i would also look at a panel switch . just turn it on whenever you aren't wearing mittens. those fans use very little current and last ''forever''.
bob noffs
not elegant but not clunky either unless you leave the thermostat on the stove!
On Tue, Aug 23, 2011 at 7:55 PM, Dan Ballin <dballin(at)gmail.com (dballin(at)gmail.com)> wrote:
[quote]--> AeroElectric-List message posted by: Dan Ballin <dballin(at)gmail.com (dballin(at)gmail.com)>
Anyone have an easy/elegant solution. I'd like to put a cooling fan
on my glare shield that exhausts the avionics when the temperature
gets over about 120. I figured some use of a thermistor, but need
some guidance. I already have an avionics fan, but in the Legacy at
least, it is nice to be able to exhaust hot air as well, but really
only want it on when needed.
Thanks
Dan Ballin
Legacy N386DMhttp://www.matronics.com/Navigator?AeroEl====================
http://forums.mle, List Admin.
=====
[b]
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user9253
Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan
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| Posted: Wed Aug 24, 2011 2:30 pm Post subject: Re: cooling fan thermostat |
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| Quote: | Anyone have an easy/elegant solution. �I'd like to put a cooling fan
on my glare shield that exhausts the avionics when the temperature
gets over about 120 |
The easiest and cheapest and lightest solution is to run the fan continuously. Avionics last longer when operating cool.
If you like to make electronic circuits, here is an elegant solution:
http://ww1.microchip.com/downloads/en/DeviceDoc/21448c.pdf
The data sheet has a schematic.
The IC is available here:
http://www.mouser.com/ProductDetail/Microchip/TC648VPA/?qs=JaP0%252bruNJH%2f4ckdZw9AR1g%3d%3d
The TC648VPA can be set to maintain any desired temperature.
Joe Gores
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Joe Gores |
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