Question about Carrier 38CKC036 Air Conditioner

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Wiring compressor Replaced defective fan motor on my a/c unit. Old motor had three wires: black, yellow, brown. New generic motor has black, white, brown, brown w/white stripe. This new motor came with a new two terminal capacitor. Old cap. had three terminals. The black and white wires from motor connect across the line voltage and the other two wires connect across the capacitor. After install and trying to run the unit, found that compressor turns on for about two seconds and shuts down, but fan keeps going. This repeats every 4-5 minutes. Compressor has three wires, two for line voltage and a third that connected to old capacitor. This third wire I connected to the new capacitor, but not sure if connection is right. Could this be the problem with compressor not working properly or is it something different?

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  • Anonymous Mar 20, 2014

    grey white and black wires, to which terminals on the pressure switch do i fix them

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The two terminal cap is only for the new fan motor. Connect the compressor wire back where you found it, on the 3 terminal cap. It's the terminal marked, "herm". The "common" terminal on the 3 terminal cap must still be connected to one side of the 220 power at the contactor. One side of the 220 goes to the common on the compressor. The other side of the 220 goes to the run winding on the compressor AND the common terminal on the 3 terminal capacitor.

Posted on Jul 22, 2008

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The new motor will have the diagram showing this. you need the capacitor that goes with the new motor. the grainger guy should have sold that to you with the motor.

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Your new fan motor should have a diagram with it or at least printed on the side of the motor, that will help a lot from your end. As for me, I don't know what unit you have, so I will try to help you with just the basics.

Your old motor probably had 3 wires. One went to the contactor, that is the "Line Voltage", one went to the Common terminal on the old capacitor (COM), that's the other "Line Voltage" wire, and the last one went to the "FAN" terminal on the old capacitor. The reason the old capacitor looks different is because it works for both the compressor and the fan motor (split capacitor). You still need this hooked up for the compressor to work.

The new fan motor.
These vary in brands and wiring so I can not tell you the colors without knowing exactly which motor you have. On the new motor wiring diagram, you should see the "Line Voltage" as described above that 2 of the wires are ran to each other (just on the diagram, not wired together on the unit). This is your power wire that goes to the contactor on the unit, usually black, and your Common wire that runs to the capacitor. You can still run this wire (COM) to the common terminal on the old capacitor since you still have to use the old capacitor for the compressor and the common terminal should still be jumper-ed from the contactor to the (COM) terminal. Then you will probably have 2 wires for the new capacitor, usually Brown and Brown/White. These wires run to each side of the new capacitor and doesn't matter which terminal. Then you will take a new jumper wire from the (COM) terminal on the old capacitor to the terminal on the new capacitor that has your Brown/White lead. Make sure you secure the capacitors inside the unit so not to touch anything surrounding them. Your new motor might also be a "Reversible" motor that has reversing wires also. Again, your new motor diagram can tell you how to hook these up. You have to have it spinning the right way, most of the time it is CCW (counter-clockwise).

I'm sorry I can't be any clearer on this, but without knowing the brands, models, etc, I'm in the dark. If you need any additional help, I would be glad to help! Good luck and hope you get to cooler days!

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Replaced fan motor for outdoor ac unit old fan has blue,black,red,and green wires new fan has brown,black,yellow,brown/white and green what goes where


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Shastalaker7
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How do I wire a new condensor fan motor to the new capacitor? The old capacitor is longer and it has 3 terminals. the new capacitor is much smaller and oval. It has 2 terminals. the fan motor has 3 wires,...


Before attempting any of these recommendations, First disconnect all the power sources and check your wiring diagrams on the motor and condensing unit.
On the old capacitor if you look on the top near each of the three terminals. Are they marked, fan - C - herm? If they are that is a dual capacitor and that needs to stay because that is also your compressor capacitor.
The Red wire from the conductor is Run and it's connected to C on the old capacitor.
Follow the Yellow wire and see if it goes to the S or start terminal on the compressor, if it does then that is the Start wire for your compressor and it connects to herm on the capacitor.
For the fan motor a lot of times the wiring connections are printed on the motor label.
Check the label, Purple should be run and connect to C on the old capacitor.
Black should be Common and it connects to the opposite side of the contactor as the Red wire. If the Red wire connects to T1 then the Black wire connects to T2.
The Brown wire shoud be the start wire on the fan motor and it connects to the Fan terminal on the old capacitor.
Now if you want to use the new fan capacitor. Take the Purple wire from the motor and look for any marks (red paint or a dash) on or beside the terminals on the new capacitor. If there is an identifying mark then connect the Purple wire to that terminal, if no marks you can connect it to either terminal. Then you need a jumper wire from C on the old capacitor to the purple side of the new capacitor. Then take the brown wire and connect it to opposite terminal of the new capacitor.

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1 Answer

EMERSON FAN MOTOR WHICH HAS A BLK WIRE PURPLE WIRE AND A BROWN WIRE WENT DEAD. SO I BOUGHT A NEW FAN EMERSON CAME WITH 4 WIRES BLK ,WHITH, BR AND BRW AND BRW WITH WHITE STRIPE. I WIRED IT BLK TO THE...


The two brown wires go to the fans capacitor. The capacitor should always be changed with the fan motor.

It sounds like your unit has a dual capacitor. One side for the fan and the other for the compressor. All you will be doing (After rewiring the compressor wires as they were originally.) is abandoning the fan side of the capacitor, and wiring your new capacitor to the brown and brown with stripe wires. It does not matter which terminals the brown wires go on.

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I have a tempstar 2000 heat pump approx 5 years old. The condenser fan blades will not rotate/operate; however, I can hear the motor hummming. When the unit is off, I can rotate the fan freely. When the...


I think this is a double problem post,so I will answer the top first.
The fan capacitor may be bad or the motor it's self is seizing up and will need replaced.

Second portion of post:
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  2. Black To the contactor where the black was originally connected
  3. yellow to the contactor where the red was originally connected

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Brown wire is Start
Yellow wire is run or Power
Black wire is High Speed or Common
The other two taps are speed taps, but you have a single speed application
And high speed is what you need ,that’s why there’s not any wires
on Red and Blue if high speed was to much then you would move the
Black wire to one of the other taps RED low speed or Blue Medinm speed
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Black goes to the Black wire you took off of high speed on old motor
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but the capacitors don’t last as long as they used.
Any time you put in a new motor always replace the capacitor
It will save you a lot of time and grief later on.

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Thank Youe461749.jpeg

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