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Can you change a 440 volt 12.5 uF start capacitor with a 370 volt 12.5uF run capacitor?
There are two ways to read this: you have a burned-out run capacitor on your motor and a good start capacitor in your parts box, and you have a burned-out start capacitor and a good run capacitor. If the run capacitor's bad and you want to put the higher-voltage start cap in its place, the answer is yes. This is called derating, and the only thing it does for you is increases the lifespan of the capacitor because you're not working it as hard as it can take. If the start capacitor's bad, don't do this--they used a 440-volt capacitor in there for a reason.
Is 24.0 mfd a good test reading for a 24.5 mfd run capacitor with a multimeter?
That would depend on the tolerance of the capacitor. As the measured value is only about 2% below nominal and most capacitors have 10% or 20% tolerance it should be fine. However if it was a precision capacitor with for example 1% tolerance it would be bad.
How do you know if a capacitor is good or not?
You test it.For electrolytic capacitors, it's sometimes (but not always) obvious simply by looking at it that there is a problem; if the capacitor bulges or is actually ruptured, that's a pretty good indication that it might be bad. However, the only way to know for certain is to check it to see if it has the proper capacitance.For various reasons it's difficult to test the capacitance of a capacitor which is in a circuit; you'll usually need to detach it and test it in isolation. It is possible to check the equivalent series resistance of a capacitor without removing it from the circuit, and in some cases this may be enough (a correct ESR doesn't necessarily mean the capacitor is good, but an incorrect one means that it's bad).
What causes high head pressure in an air cooled condenser?
It is due to pressure rising due to a bad condenser fan motor, bad capacitor, obstructing of airflowat the condenser, or a dirty condnser.
How do you determine capacitor's condition using multimeter for small capacitance?
You can use a multimeter to check the condition of a capacitor by using its highest range for measuring resistance. That range applies the highest voltage - often 9 volts - to the capacitor.If the capacitor is of a polarized type - such as electrolytic - you must be sure to apply the multimeter's test leads to it the correct way round so as to apply the voltage in the right direction so that the capacitor can charge-up.If the capacitor is shorted internally the multimeter will always show a low resistance.If the capacitor is not shorted internally and is in good condition you will see a low resistance at first but, as it charges-up from the applied voltage, you should see the resistance rise in a steady manner until it registers near to infinity.If the capacitor is failing the resistance will stay fairly low because the charge will not be held. If the capacitor is in good condition the charge should be held for several hours and the capacitor can be discharged (by shorting its wires) and then recharged repeatedly.Warning Never ever try to test a capacitor whilst it is still connected into a circuit because: * it must always be discharged safely before you try to test it because you could receive a bad electrical shock if the capacitor is still holding a charge from being in-circuit. Wear rubber gloves on both hands and short its leads away from your eyes because, if it was holding a high voltage charge, there may be a big spark!* other circuit components may get damaged, especially if they are semiconductors;* other circuit components may prevent the capacitor from being charged-up.
What makes a capacitor go bad?
Too high of voltage, bad motor the capacitor is running , or power surge
How can you check your home AC compressor which does not turn on but the fan is running?
Check to see if the capacitor is good. It is usually located inside the outdoor unit. It could be that the capacitor is bad and needs replacing. The outdoor fan will still run if you have a dual capacitor. One sure sign of a blown capacitor is that the top of the capacitor is bowed outward. If you have a multimeter you could also check the amp draw on the condensing unit. I would look at the capacitor first though
What happens in a bad capacitor?
In essence, a failed (bad) capacitor appears as a "short" in the circuit, as opposed to a failed (open) resistor which appears as a "break". Unless of course the capacitor has exploded - in that case it'll probably be a "break" as well, but don't count on it.It depends on the function of the capacitor. If the capacitor is used to 'smooth out' (filter) unfiltered voltage, this function will be lost and in addition, the capacitor will "load down" the voltage rail it's supposed to smooth out. If, on the other hand, the capacitor is part of an oscillator circuit (be it a standalone oscillator, an oscillator network, or timing source for an integrated circuit), the frequency of the oscillation will be greatly offset from the ideal value, and this may appear as many different problems (instability and lack of synchronisation with signals among others) which wouldn't easily be tracked down to the bad capacitor.If, on the other hand, you were asking about what chemical and physical events take place within the capacitor as it fails, this question should be filed under "Chemistry" or "Physics" at least in additon to, if not in the stead of, "Circuits", and it would be wise to include a word or two asking about the reactions within the electrolyte itself (as most failed capacitors are electrolytic).
Do you replace a bad capacitor for a central ac with the same size?
Typically a bad capacitor is a sign of a weakening Compressor in the unit. Rule of thumb: If the unit is 20+ years old, you would be putting a band aid on it by replacing the capacitor. If you decide to try and get by with an older system for a few more seasons, I recommend to put a new capacitor on the unit with a hard start system installed on the compressor. You can normally have this done for under $300.00. And back to your question; capacitors are sized depending on the size of the unit. Check your tonage of the unit and bring the capacitor with the correct tonage to a Parts house and they will make sure it is properly sized. Hope this helps.
Can you change a 440 volt 12.5 uF start capacitor with a 370 volt 12.5uF run capacitor?
There are two ways to read this: you have a burned-out run capacitor on your motor and a good start capacitor in your parts box, and you have a burned-out start capacitor and a good run capacitor. If the run capacitor's bad and you want to put the higher-voltage start cap in its place, the answer is yes. This is called derating, and the only thing it does for you is increases the lifespan of the capacitor because you're not working it as hard as it can take. If the start capacitor's bad, don't do this--they used a 440-volt capacitor in there for a reason.
Can a run capacitor start a blower motor running it slow and causing it to overheat or is it a bad motor?
Yes, a bad capacitor causes blower motor to become slow or stop. Since bad or shortcapacitor will make the surge of current and tripping of circuit breaker.
What fails on AC electric motors?
Bad bearings, shorted or open windings and perhaps a bad starting capacitor.
Is milky oil a bad sign?
yes it is a bad sign
When the outside fan on a central air unit doesn't come on will the compressor still kick on?
Yes it can. If the fan is not coming on you could have a bad fan motor, a bad capacitor, a loose wire at the contactor, or a loose wire at the capacitor.
How do you change a bad capacitor in an air conditioner?
Locate the defective capacitor, short the terminals to ground to release any stored energy and prevent shock, remove the old capacitor then install the new capacitor wired as the old one was and secure it in the bracket that held the old one - done.
Outside air conditioner fan freezes up?
Bad condensing fan capacitor or bad bearings on fan motor.
What causes roaring in front of car - sounds like truck with mud tires?
Possible causes include a bad tire, a failed wheel bearing, a failed transmission bearing, etc.Possible causes include a bad tire, a failed wheel bearing, a failed transmission bearing, etc.
