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Old 04-11-2022, 05:23 PM   #1
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Name: Kenneth
Trailer: Scamp
Posts: 1,879
Refrigerator fans in and out

After years of portable fan failures, I installed 12 volt refrigerator fans in the Scamp.
Inside is a pair of very small fans that wedge in behind the cooling fins and will be on any time the new switch is on. The outside is a stack fan that I could not get into the stack, so I used the included wall mount. It is also on the switch but turns on at 100 deg and off at 80 deg. That may be OK in the stack but not on the wall. Has anyone used this fan? Will it ever run?
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Old 04-12-2022, 10:28 AM   #2
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Name: John
Trailer: Roamer 1
Smith Valley, Nevada
Posts: 2,892
It sounds like your stack fan is being used to cool the volume behind the fridge and not just the stack. That sounds good and the temp range of the switch sounds good too. One of the best ways to make propane fridges work better is to install a fan to assist the natural draft of the compartment behind the fridge and keep it cooler.

Putting fans inside the box can help equalize the temperature of the food inside, especially if the box is relatively full, because the system no longer relies on natural convection.

But it can also make temperature control harder depending on where the sensor is. And it can freeze the food instead of just cooling it. The whole box tends to go down to the temperature of the cooling fins of the evaporator, if the temp sensor is on the evaporator.

The box might cool faster, but it cannot cool faster than the capacity of the cooling system, the fan just delivers the box heat to the evaporator more efficiently, but the evaporator can only remove so much heat from the box.

I installed a fan in my boat refrigerator, which was a top loader with a lot of insulation. I was able to adjust the box temp right down to 32 degrees. Everything in the box was that temp. Just barely above freezing. Food lasted much longer that way.

In the trailer, it will also mean the system runs more. This may not matter with propane, and colder means the food will last longer, but with a compressor fridge, running more means more power is used. With the compressor fridge in my Xplore, turning it down freezes everything in the chiller section, and pulls the freezer section down to about 5-10 degrees below zero. It can go from running about 10 minutes per hour at normal settings to running continuously when turned way down. In that fridge there doesn't seem to be much need for a fan in the box.

I just discovered that my side-by-side home fridge was not cooling the main section much and was getting up to about 55 degrees. That fridge uses a continuous running fan that transfers cold air between the freezer and chiller sections. The chiller temp is regulated by a set of louvers that are motor controlled and were not opening. So I stuck various things in the louvers to hold them open different amounts and watched the fridge temps, looking for a fix that did not required replacing the temp controller.
I only exaggerate enough to compensate for being taken with a grain of salt.
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Old 03-09-2023, 09:01 PM   #3
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Name: Natalie
Trailer: ford
Posts: 130
Have used this Valterra refrigerator fan. Recommend increasing the flow of air behind the fridge so the hot air is pulled out quickly. It has its own thermostat so it only turns on when needed and is amazingly quiet. Overall, very effective at making it easier for the fridge to do what it needs to do!
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Old 03-16-2023, 09:50 PM   #4
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Name: Natalie
Trailer: ford
Posts: 130
This fan for RV refrigerator is necessary for me and my family since we no longer struggle to maintain our food stock. It can solve the problem of cooling during hot weather.
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