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How to test capacitor

I was reading that to use a Audible Ohmeter to a Capacitor on a fan motor. I have a regular Ohmeter can I use it and how?

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Watch out for those caps.you use the ohms setting ,may have to go to higher setting in ohms,but take your probes place on cap terms.the cap will read closed for a few seconds then go open,then reverse the probes and do again same result.if only open then may be bad,if your meters reading fine.i have only ever used a regular meter in all the years gone by.God bless,tom

Posted on Jan 02, 2009

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The dual run capacitor is possible weak, also check all the electrical connections for tight fitting connections with can cause motor/compressor overheating.
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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 electrical compartment.You will need to discharge the capacitor before you start working around it. Todo this take a screwdriver or other long metal tool with an insulated handleand cross both terminals on the capacitor to ground. You then remove both wiresgoing to the capacitor terminals, which on fan motors are typically brownwires. Capacitors are rated in MicroFarads (marked by a µF symbol) and have a voltage rating as well which istypically 370 volts or 440 volts. Youmust have a multimeter that can read micro farads to check a capacitor. You do that by placing one probeon the one terminal and the other probe on the other terminal and it shouldread the number of the rating, for example if your capacitor is rated likethis: 7.5µF then the fan rating should read 7.5µF (seven and a half MicroFarads). If the reading is more than 6% lower than it is supposed to be, thecapacitor is weak and needs replaced. If you read 0 (zero) then the capacitoris bad and needs replaced. Take the old one with your to match up at your localhvac supplier. A typical motor run capacitorrated at 5 µF +-6% at 370 Volts ACshamoke_0.jpg

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1 Answer

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1 Answer

When I turn on the pump the motor hums for about 30 sec. then stops. Cleaned out pump basket and put my hand in, did not feel anything clogging it. When I put my hand inside I can turn the impeller...


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1 Answer

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