Universal cooling kit : What it does for your RV refrigerator.
How your refrigerator works: These units are unlike the ones you find in your home. They have no moving parts, run on both propane and electric. They use ammonia as the refrigerant, and what circulates the ammonia is heat. The mixture of ammonia and water is heated in a boiler by a propane flame or a electric heating element. The mixture boils, and the strong ammonia rises as a vapor into the condenser on the top rear of the refrigerator. Here it turns into almost pure ammonia. It exits the condenser, travels into the freezer coil first, then what liquid ammonia is left travels into the coils for the refrigerator section. After it passes thru all the internal coils, it turns back into a vapor again, because it absorbed the heat inside the refrigerator. At this point, the ammonia vapor is attracted to the weak water mixture in the absorber tank, and the process repeats itself.
What happens in hot weather - Often during hot weather spells your refrigerator section will rise above 40 degrees, this is because the condenser relies on ambiant air temperature to convert the hot ammonia vapor to a liquid. The hotter the air, the less liquid ammonia the condenser produces. So since the freezer is first in line for the liquid ammonia to run in, often it boils off and there is nothing left for the refrigerator section. Your freezer stays cold, but your refrigerator section gets warm. In extreme cases, the freezer section also warms up.
Most refrigerators are mounted in enclosures, and the sun beating on the coach will easily make the air temperature exceed 100 degrees.....the manufacturers maxium temperature rating. Also venting designs have a factor. Side vented units such as found in ROADTREK and AIRSTREAM have more temperature related problems than the more common roof vented coaches. Also this kit is exellent for refrigerators with no apparent problems also.
With this common problem present I looked for a cure. Two years later I developed the Universal Cooling Kit, A add - on device that fits almost every known RV refrigerator on the market, past and present. The patented plenum design and 44 cubic feet per minute air flow cools down the condenser, allowing it to produce more liquid ammonia. Automatic thermostat control, so you don't have to remember to turn it on or off. Low battery draw (0.20 amps) for the boondockers with no hookups. Only runs when the boiler on the refrigerator is active. Ties into the factory powerpoint of your refrigerator. Two year warranty on fan and thermostat. Price is $40.94 plus $10.00 shipping in the USA. Instructions included, some applications the plenum may need to be trimmed. Tech support via phone or email. Pat. Applied For. U.S. Patent publication number 20080178631
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