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Old 04-24-2015, 03:04 PM   #29
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All this talk got me inspired. Radio Shack had everything I needed. New fan is same physical size as the old on and puts out twice the air flow. It seems well balanced and quite compared to the stock fans I have heard. While I was at it I wired in a simple on/off switch. Tested by putting a little heat to the thermostat. It ran about 20 minutes and shut off. Did this a couple of times to make sure. Hopefully now my frig will keep a more consistent temp when the ambient air heats up.
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Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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Old 04-24-2015, 08:48 PM   #30
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Our paths probably crossed a few times. I was an acoustic operator CPO (retired) from 1980 to 95. Spent most of that time flying out of Brunswick, Maine. Flew many joint missions and training exercises with the Canadians. Traded many a case of beer for smoked salmon with their crews. Hopefully we will meet up someday down the road.
Same trade! Hope we meet some day.

Al
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Old 04-24-2015, 08:51 PM   #31
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Originally Posted by AWCHIEF View Post
All this talk got me inspired. Radio Shack had everything I needed. New fan is same physical size as the old on and puts out twice the air flow. It seems well balanced and quite compared to the stock fans I have heard. While I was at it I wired in a simple on/off switch. Tested by putting a little heat to the thermostat. It ran about 20 minutes and shut off. Did this a couple of times to make sure. Hopefully now my frig will keep a more consistent temp when the ambient air heats up.
Thanks Michael,
I already have the fans. Will rig like yours with the on/off switch.

Cheers

Al
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Old 04-30-2015, 08:59 AM   #32
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Please let me know if you find a better brand thermostat switch. I did a lot of research in computer cooling with the same kind of fans. I found that blowing air out, helped, blowing air in helped more, and blowing air in and out worked the best. I am going to do some testing on this, as I have many of these fans left from inventory. If you want a great low noise 4 inch fan, go to a computer store and buy a ball bearring fan of high quality. Should cost about $15.
The techie guy should know. A great fan can stay on for years, running 24/7 without making hardly any noise, if mounted with screws at all 4 corners.
Al
Al
I haven't found a replacement for the thermistor/thermostat, but I did find information about the one in my AS on another forum. It's an Emerson switch.

The number on the outside of mine is: 36T22 561887 F40-15C S0750

36T22 is the form factor (meaning it's a surface mount OFF/ON switch,
normally OPEN (i.e. switch is normally OFF),
and will CLOSE (i.e. switch ON) when the temp rises;
561887 is Emerson's part number.

F40-15C specifies it's a fan controller(i.e. F),
the 40-15C is the circuit CLOSE temp and temperature differential spec.
When the temp rises up to or over 40 Celsius (or 104 Fahrenheit) the circuit will CLOSE which allows the fan to run.
When the temp drops down to or below 25 Celsius (40 minus the 15c differential) (or 77 Fahrenheit) the switch will OPEN thereby cutting off power to the fan.

S1217 is Emerson's location code for place of manufacture. S1217 = made in China. Mine is a different code so I don't know where mine was made. But I've tried 2 of them in there now and they both run continuously. The second one worked for a while but now it does the same thing.

So more information, a little progress. I'll continue to look for a replacement. I did find a spare fan and the fan switch from the PO. So I got that goin' for me.
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Old 05-05-2015, 11:33 AM   #33
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Please let me know if you find a better brand thermostat switch.Al

Al
I've ordered a couple of button switches today, for the cooling fins. These are made in the USA, maybe better quality, hard to say. I've nothing against Made in China but after trying a couple of those I'm going to give these a chance. ($9.75 ea. x 2 + $10.15 shipping = $29.65. Shipping on one was about $7.50.)

I wrote the company that makes them, since they are designed for 110vac, but they said that's just the load rating and should work fine on the 12vdc.

They were quick on the response and even said they could make them for custom temperature ranges for me. I'm going to try these first and see how it goes. It will be a while before we head out again. Going up to the Airstream factory next month and will overnight in their RV park.

The 430 family will work with 12VDC. The F016 temp code maybe a better solution then the 77ºF unit as it may take a long time for your system to get below the 77degree set point.

You can buy one or two from us here:
Flush mount:
http://www.senasys.com/shop/products-page/430-half-automatic-reset/12-auto-reset-thermal-switch-close-on-rise/


To have a special one made there is a 1 time setup fee of $35 and the switches cost $13.00 each.

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Old 06-20-2015, 06:16 PM   #34
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Wow, I really wish I had technical skills like you guys. This was really helpful thread for me and the knowledge to venture forward and improve on my 25FC RB. The fan is not too noise, but just enough to know its there. But it sure seems to run a long time when the fridge is off, in the shade and in my barn. Temp. probably 79F.
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Old 06-20-2015, 06:40 PM   #35
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Work for Me

To increase the cooling efficiency of the frig, I installed a section of plastic gutter with the down spout attachement under the cooling fins and attached the fan (slightly smaller that the factory installed fan) to the bottom (see photo). It forces air directly over the cooling fins and then up and out the top vent. I've had no problem while running the frig on propane. It works well, the fan is quiet and by putting a small plastic container with ice cubes in the bottom of the fig, everything stay cold even in high temps.
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