Question about Dometic Rooftop RV Air Conditioner

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Everything seems fine,but evaporator freezes up after about an hour.any idea?

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Yes, sounds like you have a system that may allow you to set it to too cold.
Here are the highlights: One of the processes of A/C is to remove moisture. Same as condensation corms on a cold glass of ice water....Natural and normal. The process of refrigeration needs to be stopped when the evaporator core gets close to freezing. NOT ALL SYSTEMS do this automatically (which makes ZERO SENSE to me!!,) An automatic system would cycle the compressor to OFF, enough to allow the evaporator to not accumulate ice buildup. So, if your system is automatic, have it checked. My guess is your is not automatic
IF your system has a coldness/compressor control, you may need to set it warmer, to actually get maximum cooling. NUTS to ask a user to do this, because, as the evaporator freezes, the HUMIDITY goes up, the user NEEDS more cold and forces the unit to freeze up. Totally unnecessary, but even Mercedes has made cars that work this way....Nuts...
Try putting a thermometer in or very soon after the evaporator. IF you could keep the evaporator core at 34 to 36 degrees, that is the max cooling that you can get, period.
This presumes that your A/C system is in good state of repair, with the proper amount of refrigerant, open drains, etc.

Posted on May 26, 2011

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Sounds like an air flow problem.......... Dirty Filter, not all of the supply vents open, return air blocked, Evaporator coils dirty, Blower motor quiting after it runs for awhile Check run capacitor.
Check to see if you are getting an even frost pattern.... if you are not , may be low of freon Thermostat set to low not letting the unit cycle off...... Are you running the AC with low ambient conditons outside..... Which will lower the head pressure which will lower the suction pressure and get the evaporator coil down under 32 degrees which will cause it to freeze up So take your pick it can be any number of problems....... Hope this helps.......

Posted on May 26, 2011

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