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Posted on Jun 10, 2009
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Wire shorting out

I have a carrier A/C and the power line to my capacitor keeps burning up at the termination.  I just replaced it once, but it happened again and I'm concerned to do the same again as there is obviously another problem.

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  • Expert 52 Answers
  • Posted on Jun 10, 2009
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Joined: May 29, 2009
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I am not sure if you mean the fan capacitor or the compressor capacitor or both, but whichever one it is connected to is obviously drawing too many amps (if the wiring connections are otherwise good). you may soon find that the compressor or fan motor is dead. this is probably also causing your electric bill to be higher than it should be.

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Not easy to explain. The capacitor is split, it has two values, or like two capacitors connected internally with a center tap between them. Two capacitance values, maybe 5uf and 20uf, the lower value for the fan motor and the higher for the compressor, with terminals C-common, F-fan, M-compressor.
Capacitor terminal C is the center tap and that takes 3 connections, line (power) - fan line common to capacitor, and Compressor line common to capacitor. Notice the fan and compressor have a power line not common to capacitor, just power line.
Capacitor terminal F has one wire connecting to Fan terminal C, fan may have three or four terminal writes, two for power with one power being common to capacitor connection and the other power alone, two power connection wire leads. Fan motor third line is capacitor, connects to the capacitor alone. Four wire configuration fan motor is not likely your needs. Omit or ask again for further explanation.
Compressor is similar to fan, only with a capacitance value higher than for tha fan motor. Two power leads, one straight power, the other power lead connects to the capacitor power. The third compressor lead connects alone to the capacitor.
The with is to draw a diagram and level the colors of each lead and terminal lavels too. The motors nameplate may indicate wire color code, the a-c nameplate wiring diagram may be present in the control wron wiring compartment, the goal is to find clues or to trace each wire and verify what they connect or do, take notes on your drawing.
Basically the motor has three terminals, L1 - L2 - C, or C- S-R (Common, Start,Run)
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