Question about Dometic Rooftop RV Air Conditioner

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My rv air tripps breaker aftr 10 min or so only on warm/hot days

On a warm to hot day my air starts to trip the breaker, we have checked the load on the breaker, if you let it sit for alittle bit and turn it back on the line amperage runs about 17-18 amps then gradually works up to around 22-23 amps before tripping. any help would greatly be appreciated

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  • kgjohnston Jul 27, 2009

    checked supply voltage, was a bit low 108v, i switched breaker positions, the other line was running 117v, I have a 50 amp, 220 service, anyhow after switching positions the supply line votage for the air was at 115v, but the amperage was still climbing albeit a little slower now but it did finally trip at 25 amps. now remember this is while it is hot outside 100 deg . right now it is only about 79-82 deg. and night time and it is holding steady at about 15-16 amps.

  • kgjohnston Jul 27, 2009

    we pulled the cover off checked evap. and checked inside condenser everthing is clean.

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  • Master
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I suspect that your unit requires a 30 amp circuit. If it is running at 17, motor loads require 125% which is 21.25 amps. Conituous duty (means that the unit runs for 3 hrs or more) also requires 125%

You should be using a 30 amp circuit.

Posted on Jul 27, 2009

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  • Dometic Master
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Compressor is working hard, and is probably caused by dust & or dirt in evaporator coils & fins, provided your incoming voltage is high enough to begin with. You should have no less than 115-120 volts to start. Remember, low supply voltage, causes higher amperage draw. One common problem if your in a park & at the end or near end of a power run, once everyone else does the same, your incoming voltage could be low to start with. 17-18 amps when leveled off and running is pretty high. Start-up, maybe, but not once up & running. Are you plugged in directly to pole or power source or is there another extension cord there?

Posted on Jul 26, 2009

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  • Mike Butler
    Mike Butler Jul 26, 2009

    If this helped, Please take time to check rating when satisfied please & thanks.

  • Mike Butler
    Mike Butler Jul 27, 2009

    Then my next question has to be, when was a thorough service cleaning done on this unit, as in top off on roof and washed inside?

  • Mike Butler
    Mike Butler Jul 27, 2009

    Take a real close look up inside where filter is on ceiling for dust in coils/cooling fins. The dust tends to turn like mud when damp from condensation/humidity hits it, and will plug up. Not hard to do service on rooftop if your up to it.

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