Question about AO Smith A O Smith Motors Century 1hp 115v Thru - Bolt Lomart Motor - Bv90
How to test a capacitor for a single capacitor start motor. Capacitor rated 20 micro farads
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Posted on Jan 02, 2017
Black and white are usually power. an ohmmeter will confirm. Brown are for capacitors. There is almost always a diagram on the motor someplace. Eric
Posted on Jun 17, 2009
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you are working on or around electricity you run the risk of shock and or
death. If you are not competent working with high voltage and using electrical
test equipment, please consider
consulting an expert before you open an electrical panel or appliance. You
assume any and all liability by continuing with this diagnoses process.
hold a large electrical charge even after power has been removed from them
and will discharge upon contact with your skin. This is enough to stop your
heart and cause death. If you are not confident in your abilities to work with these
devices then please leave any testing or repairs to a professional.
The capacitor is inside the outside
unit and 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. To do this take a screwdriver or other long metal tool with an
insulated handle and cross the three terminals on the capacitor to ground. You
then remove the wires to the capacitor terminals, taking note of which wire
goes to which terminal.
Capacitors are rated in Micro
Farads (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 very
similar. You must have a multimeter that
reads micro farads " µF " to check a capacitor.
You do that by placing one probe
on the C or COM terminal and the other probe on the FAN terminal and it should
read the small number of the rating, for example if your capacitor is rated
like 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 half
Micro Farads). The HERM terminal is the one for the compressor and will be rated
the higher of the two numbers, I.E. the 30µF on the capacitor. Check them both
and of they are more than 6% lower than they are supposed to be then the
capacitor is weak and needs replaced. If you read 0 (zero) then the capacitor
is bad and needs replaced.
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