Question about Dometic Rooftop RV Air Conditioner

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Duo-Therm Brisk Air Model 59516.601 Ducted Roof Air w/wall thermostat

I have a ten year old Sooner horse trailer with living quarters and it is equipped with a Duo-Therm Brisk Air ducted roof air w/wall thermostat (Model 59516.601). The fan will run at all speeds, the heat strip seems okay, but when I turn on the A/C mode, the compressor will come on after about a 10 second delay (which was normal) and then try to run (low groan) for about 3-5 seconds before kicking off due to pulling too many amps. I have a volt-a-check in a 110 plug in and it draws down the amps all the way to the left on the volt-a-check meter (guesstimate of somewhere around 50 amps). Of course the compressor should run at a minimum of 110+ and usually runs at least that or better. I will not run the A/C if there is not enough voltage as I know I can burn up the compressor or blow a capacitor. I never have been able to run the A/C and the microwave simultaneously as it will trip the breaker at my 110 source. The first sign of trouble that I had was when I was I came home from a camping trip Memorial Day 2008 and plugged back into my home outlet and turned on the A/C to cool down the unit before unpacking it. I came out about three hours later to find that I had water dripping all over the dinette table from the A/C. It was cooling, but I immediately turned off the A/C and started mopping up. I took down the inside plastic vent screen and dried out the filter mesh. The voltage seemed okay, so I just let the fan run on low and dried everything out. The next trip out on July 4th, the A/C seemed okay when I ran it while packing the trailer before leaving home. I did have a bit of dirt rattle through the ducts when I turned on the fan and some tiny mud chunks like that of a mud dabber wasp nest or spider blew out of the roof ducts. Upon arrival at the campground, I could not get the A/C to work. It did what I mentioned above as far as the way the compressor does not kick in, but no water this time. The amperage at the campsite was fine (microwave worked great) and the volt-a-check measured above 110 amps. Only when turning on the A/C did the compressor pull down the amps and not want to run and tripped the 30 amp breaker on the site pole. Thanks for your help! Hot Horse Lady from the Hoosier State.

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First of all, I think you mean 110 volts on your meter, not amps, just so we're on the same page. It sounds to me like you may have a capacitor problem on your compressor. I'll try to see if I can find you a part # if you have someone very experienced with electrical that can change it for you. they can be a little dangerous, so only someone familar with them should work with it. What the capacitor basically does is store voltage and uses it to help the big draw on start-up of the compressor, kind of like giving it a boost to get it started, and after it's up and running, all should be well if everything else is up to snuff. How old is the AC unit? Did it run well for you in the past? I'm asking this just in case it was a recent installation, with perhaps wrong size wire used. Should be minimum 12/2 , with 20amp breaker,if that means anything to you, or your mechanic.

Posted on Aug 15, 2008

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