Posted by TractorMan90 on August 25, 2020 at 06:52:43 from (71.169.142.35):
In Reply to: RV AC icing posted by MarkB_MI on August 25, 2020 at 05:24:54:
Our camper did this all the time. We didn't have AC in the house, but dad would leave the camper plugged in so us kids could go out and sleep in there when it got too hot out. Those camper ones were not very advanced, and had knobs like a car from the 90's. One knob controlled fan speed, and the other the "temperature". There was no auto mode or temperature sensing. Being kids, we would just turn the fan on high, and the temp all the way cold. During the night, the temperature would drop and the humidity would go way up. By the morning, the AC unit was froze over. We would then turn the temperature to high with the fan on, and it would defrost back out, just like you did. It was always ready for the next time we needed it. There was never anything wrong with it.
Since ours was a simple AC unit, the temperature knob controls how much pressure is in the system, which is a poor man's way to control cooling amount. It was all mechanical and simple circuits, so it had no ice prevention. On systems with an electronic controller, they will have a temperature sensor comparing the temperature entering the unit and determine how often the compressor needs to be turned on. That's how almost all window AC units available today work. If your unit is a simple knob-controlled one like ours, then you're fine and just need to turn the temp down a bit. If it's an electronically controlled one, then you may have leakage or the temperature sensor is faulty.
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