Ac Trips Breaker After Replacing Capicitor

[LARRYC100]

MY AC/HEAT PUMP UNIT WAS NOT WORKING SO I REPLACED BOTH THE LARGE AND SMALL CAPICATORS. NOW THE UNIT HUMS AND THE FAN MOTOR TURNS SLOW. WHEN I TURN THE THEROMSTAT TO COOL IT TRIPS THE BREAKER FOR THE OUTSIDE UNIT AND THE FAN STOPS. WHAT SHOULD I CHECK NEXT TO GET COOL AGAIN? (RUUD UNIT)
CAN ANYONE HELP? :wall:

[GWIZ]

You may have.
Purchased the wrong value Caps
Purchased bad Caps
Wired them wrong.

[LARRYC100]

GWIZ

SUGGESTED THE FOLLOWING:
You may have.
Purchased the wrong value Caps
Purchased bad Caps
Wired them wrong.

I MATACHED THE CAPS WITH THE ONES THAT WERE IN THE A/C. I WILL REVERSE THE WIRING TO SEE IF THAT CORRECTS THE PROBLEM. MAYBE THE CAPS ARE MOUNTED BACKWARDS.

ANY OTHER IDEAS? :wall:

[GWIZ]

What are the values.
you can do more damage if you reverse the wires.
You can burn up the motors.

[GWIZ]

Generally speaking not all motors.

The motors have a run winding and a start winding.
a cap goes across from the run to the start windings
the start winding are Not meant to get the full voltage like the run side.

Some have a type of starting/relay that removes power from the start winding after the motor gets up to speed or the start winding can burn up.

[LARRYC100]

GWIZ,
THANKS FOR REPLYING. I WENT TO CHURCH TO DAY SO I COULD COOL OFF :) . I DID NOT REVERSE THE WIRING YET; I AM CHECKING THE WIRING DIGRAM AND YOUR COMMENTS BEFORE I PROCEEDE. tHE VALE OF MY CAPS ARE : THE SMALL (START CAP I THINK) 5 MFD/ 370V.
THE LARGE (RUN CAP) 40 MFD/440V .

NOTE THE COMPRESSOR IS NOT MAKING ANY SOUND THE FAN IS JUST TURNING SLOW UNTIL I TURN THE UNIT TO COOL.

ANY SUGGESTIONS? :confused:

-UPDATE-

I REVERSED THE WIRES ON THE CAP AND GOT SAME RESULTS. WHEN EVER I TURN THE INSIDE THREMO TO COLL IT TRIPS BREAKER TO OUTSIDE UNIT.

HOW CAN I TELL WHAT IS CAUSING IT TO TRIP? AND ALSO TEST THE COMPRESSORF TO START UP? :thinker: CAN I TEST THE COMPRESSOR TO SEE IF IT IS THE CORPORATE?

[GWIZ]

Just a Guess I don't have a drawing.

(START CAP I THINK) 5 MFD/ 370V.
THE LARGE (RUN CAP) 40 MFD/440V .


The 5 mfd is the start/running cap for the fan.

The 40 mfd is the start cap for the pump.

[LARRYC100]

I Think You Are Correctabout The Caps. But What Might Cause The Unit To Trip The Breaker And The Compressor To Not Come On?

Thanks Again

[GWIZ]

What was the problem before you changed the caps ?
Did the motors run ?

Purchased bad Caps
Wired them wrong.
shorted wire any place.
Starting relay on pump motor bad if its has one.
shorted motor.
Froze/Locked motor.

[LARRYC100]

Before Changing Caps The Motor Did Not Run.

After The Change The Fan Runs Slow Until I Turn Thermo To Cool Then The Unit Trips The Breaker.

I Don't Think The Compressor Is Coming On.

The Fan Turns Slowly But Should Speed Up When The A/c Is Switched On?

I Am Not Sure About Start Relay On Pump. The Compressor Has Little 3 Wire Connector May Be Over Load Protector.

Still Looking
Thanks

[Grady]

The compressor could be drawing so much power there isn't sufficient energy to bring the fan up to full speed. Try disconnecting the compressor & see what happens.

[GregH]

LARRY,

If you are trying to diagnose a compressor that will not run by replacing the capacitor you will need to go to the next step.
That would be to use a meter to check the windings for continuity and a clamp on ammeter to see if there is current flowing to the windings.

A service call by a qualified mechanic may be in order.

[LARRYC100]

THANKS GUYS FOR YOUR INPUT.

GregH
ARE YOU REFERING TO THE FAN WIRING IN YOUR CLAMP ON AMP METER TEST?

I WILL TRY TEST AND SEE WHAT I GET

THANKS AGAIN :coffee:

[dougm]

Wait a minute. You say the outside fan runs (slowly) without a call for cooling?? That doesn't sound right at all. There shouldn't be power to anything until the contactor is closed by a call for cooling from the thermostat. May be a problem at the contactor or in the wiring that's causing all these symptoms. I'd examine all the wiring carefully, especially the wiring to and around the contactor and look for a short. By now, I'm guessing it'll be fairly obviouse. If not, it might be time to call in a pro.

Doug M.

[LARRYC100]

THANKS DOUGM

I AM TRACING AND CHECKING ALL CONNECTIONS BASE ON THE DIGRAM UNDER THE COVER. ONE WIRE LOOKS A LITTLE BURNED I WILL REPLACE IT AND SEE WHAT I GET AND CHECK ALL CONNECTIONS TO SEE IF THEY MATCH DIAGRAM. :alarm:

THANKS AGAIN

[LARRYC100]

I just finished taking the fan out and tried the compressor by it self and it triped breaker. 2. then I cut power and tested the overload protector on the compressor. not sure but some flux on one of the three leads.

The overload proctector is sticking inside the compressor is it possible to replace it or do you have to replace the entire compressor?

Can anyone help with this one?

THANKS GUYS :thinker:

[Slidell]

NOT an a/c guy here but have you checked the breaker itself? I had an a/c that kept tripping breaker, ended up getting a new unit after several service calls, the breaker still tripped after the new unit was installed. Finally guy at Lowes said its prob a bad breaker, I replaced it myself 2 months ago for under $10 and has not tripped since although I do have another prob now. Breakers do go bad.

[LARRYC100]

THANKS SLIDELL,

I'LL CHECK THE BREAKER OUT.

HOWEVER THE COMPRESSOR DOESNOT COME ON????

THANKS AGAIN :confused: