Question about Dometic Rooftop RV Air Conditioner

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My 2007 unit don't get cold enough. the maximum outlet air is 60 degrees

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  • burzerko
    burzerko Jun 02, 2008

    I have a duotherm on a 2005 Sanpiper that is having the same problem. Mine is charged with 134a I have kept the condensing coils clean this has helped. I also try to park mine in the shade. This seems to help as well. welcome to the wonderful world of ozone friendly refrigirants.

  • James Helmer
    James Helmer May 11, 2010

    What is the outside ambient temperature? Is the unit parked in the sun?

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Ozone friendly refrigerants work on all the same principles as the old type of refrigerants. Outside ambient temperatures when higher will reflect on the cooling end of the system. Pressure and temperatures in any refrigerated device are directly related in all cases. Refrigerant charge to produce the proper output is critical in these units. Name plate is printed with a specific charge. If the charge is low the output will be less.

Posted on Jun 30, 2008

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If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
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You may have the humidity/moisture level set to high. Try lowering it to 35%. Or if you don't have a LED Screen on your unit, turn it to maximum.

In addition, most dehumidifiers don't work well if the air temperature is between 40 & 60 degrees F. Keep in mind, the temperature at floor level in a basement is colder that the air temperature at chest high level. Raising the unit up, off the floor on something sturdy enough to handle the weight (with a full tank of water) and the vibration, may help.

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Rather than have you disassemble the cabinet to get to the coils, I want you to do an "At Home Test".

Move the dehumidifier to a bathroom that has a shower. Plug it in, Turn it ON and set the humidity level at 30%. Turn the shower on to medium hot (enough to generate some steam. Do Not turn On the bathroom exhaust fan. As you leave the bathroom close the door. Wait 15 minutes and return to the bathroom. Turn the shower OFF and inspect the unit's water collection bucket for water. If you find any, the unit is working as it should. If you don't find any water, it may be that the humidity sensor has failed or the air intake filter is clogged. In which case, remove the filter and clean it. If it's the sensor, unless you are really DIY savy, I'd recommend buying a new dehumidifier. As finding the part (your unit was made by Fedders), the cost of the part and the labor involved, to me, out ways repairing it.

Now, on the positive side ... If you saw water in the bucket after the bathroom test. It may simply be, that at this time, there is not enough humidity in the room air (even at 30%) to trigger the sensor. If the unit is in a basement, the air temp (60 degrees or lower) will affect it. As the temperature at floor level (where the unit is) is 5 to 8 degrees colder than the air temperature. Dehumidifiers don't work well in cold temperatures.

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No it means you 50 degree one is working better than perfect. Clean the one that is only getting down to 60 degrees but remember if a unit is dropping the air temp by 20 degrees its working fine. You ck this by cking the air at the intake where the filter is say temp is 80 degrees and then take a reading at a discharge vent where the cold air comes out if its 60 you have a 20 degree drop and that is considered good. If the unit was low on freon the unit will freeze up (ice will form on the inside coil).

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