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Old 05-24-2009, 09:10 AM   #16
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Fan on Outside Unit reverses direction when compressor kicks on


You bet.And if you didn't need to go to the bathroom before getting nailed by it.You will afterwards.

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Old 05-24-2009, 09:10 AM   #17
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Fan on Outside Unit reverses direction when compressor kicks on


LOTS of charge! Capacitor= capacity=ability to hold a charge. Wear leather gloves when changing one or discharge it with a screwdriver to ground. 1% chance it could explode without using a resistor to discharge it but in 30 yrs it has not happened to me.
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Old 05-24-2009, 09:15 AM   #18
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Fan on Outside Unit reverses direction when compressor kicks on


"kennzz05, so the fan motor is probably shot due to overheating when the compressor wasn't kicking in? It does not make noise (bearing) and spins freely. The only thing is it goes both direction (Not randomly, counter-clockwise when compressor is off, clockwise when compressor is on.) There is cold air if I dare to turn it on"

If it is running backwards when the compressor is off then the motor has some short to ground and can be be lethal dangerous. Had a shorted compressor do that and almost kill me. Doesn't draw enough amps (20 or more) to trip the breaker but can still run with current flow to ground.
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Old 05-24-2009, 09:16 AM   #19
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Fan on Outside Unit reverses direction when compressor kicks on


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Originally Posted by yuri View Post
LOTS of charge! Capacitor= capacity=ability to hold a charge. Wear leather gloves when changing one or discharge it with a screwdriver to ground. 1% chance it could explode without using a resistor to discharge it but in 30 yrs it has not happened to me.


You've never used your tounge to check the cap?? Just Like checking 9 v batt
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Old 05-24-2009, 09:17 AM   #20
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Fan on Outside Unit reverses direction when compressor kicks on


I just did a little searching and found the answer to my quesiton about discharging the capacitors. it seems like you could get a pretty strong zap from what is stored in there. I haven't found anything that says it is lethal like the ones in a TV or other high voltage caps.

pretty cool stuff..
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Old 05-24-2009, 09:18 AM   #21
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Fan on Outside Unit reverses direction when compressor kicks on


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You've never used your tounge to check the cap?? Just Like checking 9 v batt
that almost made me spit my coffee on the screen!!
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Old 05-24-2009, 09:20 AM   #22
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Fan on Outside Unit reverses direction when compressor kicks on


Worked with a few electricians named Sparky and have done the human voltage tester trick myself on occasion. LOL. Worked with 600 volt 3 phase stuff for awhile. Now that is SCARY!
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Old 05-24-2009, 09:21 AM   #23
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Fan on Outside Unit reverses direction when compressor kicks on


As far as lethal.That would depend on how strong your heart is also.I've taken more then one hit from them. Its no fun.
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Old 05-24-2009, 09:24 AM   #24
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Fan on Outside Unit reverses direction when compressor kicks on


Actually my heart is in pretty damn good shape. Bought a treadmill and am running like the wind on it. Can get the old ticker up to 165 BPM and maintain it. Blood pressure optimal. Must be all the good slavic lifestyle, eat lots of garlic, scares the werewolves away. Awoo.
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Old 05-24-2009, 09:39 AM   #25
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Fan on Outside Unit reverses direction when compressor kicks on


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is there any charge in an HVAC capacitor?
Depends on when during the AC cycle you disconnect it, but most of the time there is enough voltage to shock you.
If the cap sees 120vac in use then the peak voltage left on the cap could be ~170vdc, occasionally.

One joule of stored energy is at the bottom end of the scale as to what can be fatal and these caps may occasionally store that much.
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Old 05-24-2009, 09:41 AM   #26
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Fan on Outside Unit reverses direction when compressor kicks on


Beenthere, and others, I edited my post earlier, do you think the motor is shorted to ground as he said it runs backwards when the compressor is off? I checked the wiring diagram and apparently they used a contactor that breaks both poles so in theory it should get no power if it is complety open in the off cycle. If it was replaced with one that breaks only one contact then we have a different scenario.

Last edited by yuri; 05-24-2009 at 09:45 AM.
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Old 05-24-2009, 09:46 AM   #27
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Fan on Outside Unit reverses direction when compressor kicks on


A system that only needs a 370 volt cap.Has a cap that sees as much as 524 VAC at the peak and bottom end of the sinewave.
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Old 05-24-2009, 09:50 AM   #28
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Fan on Outside Unit reverses direction when compressor kicks on


Actually. It could be either the condeser fan motor, or the compressor motor that has a short in it.He needs a tech that knows how to do more then just replace the part that is showing a symptom.
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Old 05-24-2009, 09:53 AM   #29
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Fan on Outside Unit reverses direction when compressor kicks on


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A system that only needs a 370 volt cap.Has a cap that sees as much as 524 VAC at the peak and bottom end of the sinewave.
So Vp-p is 524 v? This would be 524/(2.828) = 185v RMS, 262v peak.

Does the cap always see 60 Hz, or does it depend on motor speed? Because if it always sees 60 Hz you can check the cap in circuit with a voltmeter and a clamp-on ammeter. You don't need a C-meter.
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Old 05-24-2009, 09:56 AM   #30
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Fan on Outside Unit reverses direction when compressor kicks on


The motor just don't know which way to turn.. It wasn't trained properly when it left the factory... Seriously,,, IMO There is something wrong in the start windings

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