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Old 03-23-2004, 08:21 PM   #15
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This one showa the therm-o-disc that turns the fan on & off as needed. I'm going to wire in a switch between one leg of the disc connection for inside control.
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Old 03-23-2004, 08:24 PM   #16
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Last one --you can see how the fan bracket is attached to the inside of the door frame. Probably could extend the bracket to add another fan to run inseries , which I'm told will make it run with less noise.
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Old 03-23-2004, 10:20 PM   #17
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Here was my solution

I bought these fans at radio shack and installed them.
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Old 03-24-2004, 12:01 AM   #18
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Thanks for the pics. I tore into two old computers we had tucked away in the garage and found two good three inch fans. I built a frame for them out of strip aluminum, and now I just need to get them wired up. I tested them on a 9v battery and they worked great. While I was testing them on a 12v source in the trailer the 12v extension suddenly quit working. I blame radio shack.

I'm also adding a baffle above the fans to direct the air up and into the vent. the fans are going to be above the fins, screwed into the wood there.

The only other thing I had question about was if there's any maintenance I should do to the fridge while I have access to the back. There is a little surface rust here and there on the coils. Should I do something to touch that up? I cleaned up and got out all the dust and debris I could.
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Old 03-24-2004, 12:13 AM   #19
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Fans

Are the fans you have rated for 12v dc?? If they came from a computer they may not be.

The ones I got are rated 12v DC . As far as cleanup, blow out the dust and I suppose you could sand and touch up paint the rust or put some Ospho rust converter on the spots. Make sure you use a heat stable paint like BBQ paint or engine block paint.

And I suppose clean out the burner flue to see if there is any soot buildup.

Anyone else have any thoughts?
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Old 03-24-2004, 12:30 AM   #20
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Yes, they are both 12v DC fans. I actually ended up with three of them, 2 from power supplies and one case fan, but one was noisy so I decided not to risk it going out after all the trouble I was going through to install them.

I'm not sure why the 12v extension I was testing with went out. It is a thing with a auto-cigarette-lighter type plug on one end, and a long pair of wires which I had attached two crimp on connectors to for testing. I plugged it into a car-lighter type socket in the bathroom, and it worked, then it suddenly died. I thought I'd blown a fuse, but everything else in the trailer still worked, and when I tried the extension in the car, it didn't work there either. I don't think anything I was doing with these two little 12v fans could have killed it. I knew which side was + and which was -, and besides if I messed that up I would have expected to damage the fans, not the power source. Ah, it's been a long time since college electronics classes...
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Old 03-24-2004, 06:09 AM   #21
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A. E. Milliman

Quote:
I'm going to wire in a switch between one leg of the disc connection for inside control.
Don't wire the switch inline with the therm-o-disc, if you do it will only turn the fan off when the fan should be running. If you want to be able to turn it on and off at any time it should be in parallel with the disc.

John
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Old 03-24-2004, 06:18 AM   #22
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Stephanie,

You likely blew the fuse in the 12 volt cord. They are normally rated for 2amps or less and the two fans in series created too big a draw. The tip of the adapter screws off and the glass fuse is inside. replace it with a 10 amp fuse ant you will be fine. I would also incorporate a fuse holder before the fans so they don't blow out the main fuse for the circuit you are tapping into if one of the motors freezes up.
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Old 03-24-2004, 09:03 AM   #23
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Glad you pointed that out John, that's actually what I was going to do & missed it. Also I'll be fusing it at the same time.
Best,
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Old 03-24-2004, 09:26 AM   #24
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ok, I'll be sure and add a fuse to the system as well. Do I want it on the power or ground wire?

When the extension quit working I thought for sure I'd blown a fuse in the trailer! It was a relief to discover it was only the extension!
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Old 03-24-2004, 09:45 AM   #25
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Fuse the 12 volt + side. The ground side does not need to be fused.
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Old 03-29-2004, 09:05 AM   #26
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Hi John
Can you tell me were you got the in-line thermostat?

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Old 03-29-2004, 09:24 AM   #27
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Therm-O-Disc

Hi Gang,

I did a search on Therm-o-disc and Grainger came up. I found a fan control that switches on at 110 deg F. and opens (goes off) at 90 deg F. The description is:

3F01-111
Snap disc fan control
Close on rise of temperature
Fixed setting

I believe their number is: 2E245B

Cost less than $10.00. Works like a charm.

Hope that helps.

Take care
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Old 03-30-2004, 07:35 AM   #28
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Hi John

Thanks for the info.

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