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Old 01-28-2011, 11:59 AM   #29
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Fans dc / ac or Atomic ? 8O) =

Dr4Film
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"These fans are NOT 120 volt AC converted to 12 volt DC. The poster that stated that fact earlier is totally wrong."

Possibly I did not make myself perfectly clear? I stated that the fans are 12 VDC, but are converted to AC so as to eliminate the interference that would be caused by a DC motor's brushes.

The only point was, a computer fan will not run if the black wire is connected to the positive and the red wire to ground.

To reverse the airflow you would have to turn the fan's frame 180 degrees.

True all DC motors with brushes are reversible by crossing the wires.

Should have let the point go as the original poster was happy with the way his blew anyway. )

Jim
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Old 01-28-2011, 02:39 PM   #30
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Quote:
Originally Posted by JAMESRAYSR View Post
Dr4Film
(Quote)
"These fans are NOT 120 volt AC converted to 12 volt DC. The poster that stated that fact earlier is totally wrong."

Possibly I did not make myself perfectly clear? I stated that the fans are 12 VDC, but are converted to AC so as to eliminate the interference that would be caused by a DC motor's brushes.

Jim
YUP - I, for one, understood your earlier post and point perfectly - was going to comment to "Dr4film" accordingly, but got sidetracked...
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Old 01-29-2011, 07:00 AM   #31
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OK, guys, I now understand what you were trying to convey about the differences between AC and DC motors.

Thanks for making it clearer for me. I'm not an expert when it comes to electrical stuff, I leave that for my two brothers who are EE's to help me with, so I basically know enough to be VERY dangerous.

Dr4Film ----- Richard.
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Old 01-29-2011, 08:35 PM   #32
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How did you mount the 'blue' fan set up to the cooling fins. Basically I just used the alligator clip (which ended up being the ground wire) to clip to the fins which grounded the unit. This is a very tentative attachment at best. The positive wire I just attached to the connection on the light so when the fridge is on and the light is off (fridge is closed) the fan runs. When the door is open and the light is on the fan stops.
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Old 01-30-2011, 09:47 AM   #33
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Fans stopping when the door is opened is good, so as not to move all the cold air out when the door is open.
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Old 01-30-2011, 10:42 AM   #34
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Quote:
Originally Posted by firedoc View Post
How did you mount the 'blue' fan set up to the cooling fins. Basically I just used the alligator clip (which ended up being the ground wire) to clip to the fins which grounded the unit. This is a very tentative attachment at best. The positive wire I just attached to the connection on the light so when the fridge is on and the light is off (fridge is closed) the fan runs. When the door is open and the light is on the fan stops.
I just installed mine yesterday. It seems like a nice fan but mounting it is not as easy as it sounds. I could'nt figure how to mount it except to hang it on the fins from the clip. I did'n't like that. I also thought and found the ground wire and clip were too short and stiff so I spliced in an extra 6" of wire.




I ended up mounting it under the cooling fins supported with a short piece of wood held in place with double sided tape to the water 'catch tray'. If I come up with a better idea for mounting, I can always change it later, but this seems like it might be ok. I can turn it off easy by disconnecting the clip when I want.
I like 'firedocs's' idea of this " When the door is open and the light is on the fan stops.[/QUOTE]" . I do not know how you did this. Can you elaborate a little more on this?
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Old 01-30-2011, 04:19 PM   #35
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What part of the light fixture is the hot wire attached to? Joe
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Old 01-30-2011, 04:50 PM   #36
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Could the plug be there to keep critters out?
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Old 01-30-2011, 05:14 PM   #37
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azloafer, use a volt meter or voltage tester and find the switched 12 volt connection. It will give 12 V when the door is closed and 0 V when the door is open (light on).
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Old 01-30-2011, 07:56 PM   #38
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azloafer, use a volt meter or voltage tester and find the switched 12 volt connection. It will give 12 V when the door is closed and 0 V when the door is open (light on).
YUP - but the fans need full-time 12 volts to operate properly - not only when the door is open and the light is lit!

Some here assume that all refrigerator interior lights operate by switching the ground side lead, leaving power "on" to one side of the light whenever the refrigerator is in operation...

Believe it or not - ALL RV refrigerators DON'T work thataway!

As, for instance, the Dometic in our 5er - and the Norcold in our MH! SO, on those, another constant 12 volt source has to be located and provided, which is why I earlier mentioned and provided a picture of the method used on our MH - 'twould be sorta foolish to dig around other places outside the refrigerator for a steady 12 volt source, IF there was one already there, just inches away INSIDE the refrigerator...
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Old 01-30-2011, 08:37 PM   #39
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also thought and found the ground wire and clip were too short and stiff so I spliced in an extra 6" of wire.

UMmmmmmm - well, yeah, but that "short and stiff" piece of wire is ACTUALLY what is there to locate and secure the fan up next to the fins of the refrigerator to allow the fan to be placed wherever you select along the width of those fins, which are also the ground return for the fans - the fans can simply hang from the wire and clip - or, usually, be placed on the rear edge of the adjacent refrigerator shelf - sorta like this...



The short stiff wire already provided with the fan is simply bent as needed for best mounting position of the fan.

Nothing wrong with the method you used - just maybe unnecessarily complicated?

By the way - check out the fins in that refrigerator - the refrigerator has been in constant use since before Thanksgiving - freezer temp is -4 degrees - and refrigerator temp is a uniform 20 degrees - with the thermostat on 6 - NO frost buildup, and the refrigerator is nearly full of stored food..
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Old 01-30-2011, 10:54 PM   #40
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Gary there should be 12 v at the switch or lamp whether it switches the hot side or the ground. You did not read my post correctly, my Dometic is like firedoc's and as I said in my last post. Reff on door closed fan RUNS, door open light is on fan is off.
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Old 01-30-2011, 11:05 PM   #41
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With my limited understanding of electricity, I am going to go out on a limb here and say that the light in the fridge is 12 volt. [?] Otherwise I'll get fried in there!
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Old 01-31-2011, 06:41 AM   #42
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Yes 12 V.
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