A/C unit blowing in outside air (?) - Fiberglass RV
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Old 07-15-2018, 03:06 PM   #1
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Trailer: 13 ft Scamp Deluxe 2007 and 40' Allegro Bus
Posts: 219
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A/C unit blowing in outside air (?)

Our 2007 Scamp 13' A/C unit works great, with one exception. The compressor cycles on and off as it should, however, when the compressor is off, and the fan running, the unit seems to be bringing in some outside air which adds humidity to the inside of the trailer. Shouldn't the a/c unit fan be recycling the inside air when the compressor is off instead of blowing humid outside air into the trailer?
Our A/C unit has "low fan, high fan, low A/C, high A/C settings ( and of course a thermostat to control the compressor) so there's no options to change the "air source/flow" the A/C is receiving and passing along into the trailer.
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Old 07-16-2018, 10:35 AM   #2
Name: William
Trailer: 13' Perris Pacer
Posts: 46
The increase in humidity you are experiencing is not from outside air, but is coming from condensation on the evaporator coils. When the compressor is on, the coils cool enough to attract condensation. When the compressor cycles off, the coils "warm" and the condensation is released into the air passing through the the coils. Too bad RV air conditioners don't offer a provision to shut down the fan when the compressor is off--just like the central air conditioning in your home.
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