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The Dual capacitor went out and I replaced it with the same numbers listed on the side. I went to set the temperature and turn it on and it will not even turn on. The thermostat has power, but the A/C unit will not turn on. Do I need to wait awhile for it to work?

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Hi,
Check the power to the outdoor unit it may be off...

Also the t-stat will have a five minute time out...

heatman101

Posted on Sep 08, 2010

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***CAUTION*** Anytimeyou are working on or around electricity you run the risk of shock and ordeath. Please consider consulting an expert before you open an electrical panelor appliance. ***CAUTION*** Capacitorshold a large electrical charge and will discharge upon contact with your skin.This is enough to stop your heart and cause death. If you are not confident ofyour abilities around these devices then please leave any testing or repairs toa professional. The capacitor is inside the unitand you have to remove the cover to see the inside of the electricalcompartment. You will need to discharge the capacitor before you start workingaround it. To do this take a screwdriver or other long metal tool with aninsulated handle and cross the three terminals on the capacitor to ground. Youthen remove the wires to the capacitor terminals, taking note of which wiregoes to which terminal. Capacitors are rated in MicroFarads (marked by a µF symbol) and a dual capacitor, shown in the image below,will have two ratings listed like this "35/5µF" or something verysimilar. You must have a multimeter thatreads micro farads to check a capacitor. You do that by placing one probeon the C or COM terminal and the other probe on the FAN terminal and it shouldread the small number of the rating, for example if your capacitor is ratedlike this: 30/7.5µF then the fan rating will be the smaller of the two numbers.In this case the 7.5µF (seven and a halfMicro Farads). The HERM terminal is the one for the compressor and will berated the higher of the two numbers, I.E. the 30µF on the capacitor. Check themboth and of they are more than 6% lower than they are supposed to be then thecapacitor is weak and needs replaced. If you read 0 (zero) then the cap is badand needs replaced.
Typical dual run capacitor C terminal is common, HERM terminal is compressor and FAN terminal is for fan motor.
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1 Answer

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1 Answer

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