Question about Dometic Rooftop RV Air Conditioner

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UNIT WAS ACCIDENTLY CONNECTED TO 240 VOLTS AND NOW WON'T WORK. REPLACED A $70 RELAY AND IT STILL WONT COME ON. HAL

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Hi, it doesn't take very long at that voltage to take out motors and controls. Normally, you will blow fuses, or the motors will trip out on there over loads, so Hook it back to 110 volts and start the process off checking the motors, compressor, thermostat, ect. I have worked on a/c systems for 30 years, and 2 times I have hooked up my service equipment to 240 volts. The motors in my recovery machines lasted only a few seconds before smoking the windings. If you have a digital meter and are familur with using it, you will need to check all of your motors. Or, you can disconnect each one and apply 110 volts to each one to see if it runs. You have to be very careful as this is very dangerous if you know nothing about voltage and amps! !/10 of 1 amp will stop your heart, and you are working with around 30 amps, so keep this in mind. This will be a process of elimination on the parts that may have burned out. If you have 110 volts in all the right places such as the compressor and condenser motor, they should be running. Make sure you didn't burn out the thermostat by taking off the sub-base exposing the wires and jumping them out to see if it comes on. If it does, the stat is faulty. More then likely, you didn't burn out any control voltage parts. Check what I have asked you to, all motors, take the run capacitors and have them checked, but draw you a diagram on how they are wired and a parts house will check them for nothing to see if they are shorted or open, (dead ) internally. Please don't forget to rate me as I know you will be kind. Please keep me posted on this so we can get this going for you.
Sincerely,
Shastalaker7
A/C, Heating Contractor

Posted on Sep 11, 2010

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1_1_2012_4_19_44_pm.jpg

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