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Compressor draws 50 amps on start and drops out? Mod. 700-800 about 10 years old.

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Most likely bad motor. 50 amps is way to much at start. Motor locked up.Nameplate may contain LRA rating which stands for locked rotor amps. If you near or above motor is seized.

Posted on Aug 19, 2010


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I have a 5 hp compressor. It will turn on and run maybe 5 seconds and then kicks my breaker out.

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My ec12 runs for about 5 to 10 seconds then pops the circuit breaker

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1990 festiva blows 10 amp but blows fuse after engine staetsfuse everything woeks fine with key in on position

Get a wiring diagram & see what is on that fused
circuit & work that circuit. Leave the fuse out at
first & make sure only that fuse & circuit is involved

When a car gets over 15 years old, then & only
then, do you start to have fuse issues as wiring,
connections,relays,switches & devices using electrical
current, start to get loose,corroded,& develop resistance

I would remove & clean every ground wire on the car you
can find

Both ends of the battery cables as well

Do voltage drops afterwords on cables

Check for alternator diode leakage or what
is called a/c ripple

Check for current draw by putting an amp meter
in series with either battery cable & wait for things
to time out,make sure you leave the doors closed
& allow at least 10 to 15 min.

You shouldn't have over 50 to 70 milli-amps

Just the clock & computer memory & some keep
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Don't keep replacing the fuse,that is not a fix

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1 Answer

The rla on my weather king ac specs says 26 amps but a serviceman measured the current at 40 amps. he said the compressor was on its way out and recommended i install a new unit. is he correct? what would...

Hi, if a compressor draws that many amps above its running load amps, it is not normal at all. It would be tripping the breaker at 25 to 27 amps!! If the compressor is overloading that much, it wouldn't run at all.It could be that your outdoor coil is very dirty causing this reading. Take a water hose and wash it out good. Careful not to bend the aluminum fins when doing this.If the specs say 26 R.L.A., it wouldn't run at all at 40, no way at all. This tech must be green, or very fresh out of school.Wash the coil to bring the head pressure down, and see if it starts cooling. Any compressor that draws max amps will shut off on internal overload. If the compressor is on its way out, and he said its drawing 40 amps, it would be locked up, L.R.A, locked rotor amps. Wash that coil very well, as this is what causes high amps, and see what happens. He is wrong.Have them send a different tech out free of charge, and tell him what I have told you. If the compressor is 30 years old, it still could not draw that many amps, as the breaker, or fuse would blow in a second, or it would lock up! Please keep me posted,
A/C, Contractor

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1 Answer

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1 Answer

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