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Comments for RV Doctor explains A/C condensation

  • Hello, he is basically right but….. Carrier invented A/C to remove humidity NOT to cool the air, which is the perceived purpose. The rooftop unit contains two coils, the first is the evaporator coil (cold) and the second is the condenser coil (hot). The evaporator coil is the one that absorbs the heat and the condenser coil gives off the heat.
    The evaporator must always be clean (change filters) and the proper amount of A/C charge in the system to function correctly. If you do not have cool air, or if the A/C is dripping inside you probably have an iced up coil. Keeping the air filters clean is imperative as an iced coil will also destroy the compressor. Another common cause of an iced up coil (no cooling and interior water dripping) is the failure of the blower fan motor that circulates air from the coach through the evaporator coil and back to the coach.
    The other coil, the condenser coil, (hot one) then removes the heat absorbed by the evaporator process and uses an air surface fan to cool that coil. The water on top of the drip tray inside the A/C package is outside ambient water that condenses as the air temperature changes, thus the amount of moisture the air can hold (saturation). As he stated; this water will either run out of weep holes, out onto the roof and down the RV or will evaporate outside.
    I always remove the shrouds from my rooftop A/C units at least twice a season to ensure no critters have moved in and nested where it blocks either the air flow needed for cooling the condenser coil or obstructed the fans. I use a backpack sprayer with a solution of Dawn detergent to spray the condenser coil, fan blades and weep holes and shroud screens to keep the A/C working efficiently and trouble free as possible.
    Your A/C is a closed system and if someone tells you that it needs Freon or to be “recharged” then you have a leak that must be repaired, the system evacuated and then recharged. To simply add Freon is a good way to destroy the compressor and little more than a temporary band aide as Freon and air make acid! If you have a leak, you have air and Freon together, you have acid which will destroy the compressor. Hope that helps.

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