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Please identify compressor connections. Original = red to low, white to high left, nothing on high right. New 3n1 has black (common) and red (run) white (start) and twin black power lines.

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The three compressor pins are shaped in a triangle, the common is either directly on the top or directly on the bottom depending on the compressor. The wires of the supco are installed with the red to run, the white to start,and the black to common.(If the common is directly on top, run is lower right and start terminal is lower left) (If the common pin is directly on the bottom, the run is on the upper left, and the start is on the upper right) When you cut out the bad relay overload, the wires hook on the two black wires of the supco with bare ends.

Check for full 120 volts at the outlet, important.
If you have a meter you can ohm out the compressor windings, the run and start are connected to the common. It is easier to explain looking at a picture, so good luck.......... Picture a triangle with three letters c for common, r for run, and s for start........

The other thing to remember is there is a new type of compressor(some variable speed new one I am unfamiliar with) that does not use this setup, check the schematic(95% will) Consider if you still have a warranty on the compressor also. Supco also sells a 3n1 with a hook up for the old capacitor on its part, very handy, just plugs on, you do not mention it, so probably not the one you have. If you get your compressor running and it sounds good, do not buy a fridge full of groceries for a week or so, compressor may fail, let it run for a few days first, hope this helps,
good luck and do not forget to unplug when working on it..........

This is basically general information for a older refrigerator out of warranty....
Also consider the possibility of what could go wrong if you are not sure of your work, do not attempt this if there is a strong burn mark from old electrical s, replace compressor and or buy a new unit.

Posted on Mar 17, 2011


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Iam replacng my home a/c blower motor. My unit hasa red a black and a white wire. My new motor has a black wire a blue wire a red wire and a yellow wire. I need to know which color wire goes to which

On the original motor, red was low speed, black was high speed and white was common. The new motor should either have a diagram on the side of it or within the box for verification, but the black SHOULD also be high speed and the red wire SHOULD be low speed , the blue wire SHOULD be medium and the yellow SHOULD be common. However, you MUST verify those connections on the wiring diagram provided with the new motor before you connect or you will probably let out the MAJIC SMOKE !!! The speed you decide not to utilize can just be taped off and zip tied to the bundle.

You made no comment about two brown wires, and if either motor has two browns, they go to the run capacitor.

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I am installing a 3n1 Hard start. Need to know what each pin on side of compressor is for, so I can install properly

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1 Answer

I took the pump out and repaced with a new one. The wiring lugs are different. the old one has White common, black low red High. The new one has no distinction as to what is low or high. How do I hook...

all US motors should have a wiring diagram on the side of the motor unit. The wires going into the pump would hold their same values. I am assuming the previous pump was two speed as well, if not that is your problem.
assuming that they are both two speed reference the common on the pumps motor diagram, and connect the white wire to that terminal.
reference the diagram for correct low speed and connect the black wire to that termial,
repeat for the high speed.
I deal alot with the flo master pumps and they should all be labeled. The most important thing is to get the common correct, switching the other two wires (black and red) incorrectly would simply result in high coming on when low is supposed to and vice versa.

If there really is not a diagram, here is the most typical setup for that motor.

(if you look closely at the terminals on the motor, there are numbers there)
connect the white common to terminal #5
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Hope this helps.
If this post has helped you, please take the time to vote positively for me on this site.
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1 Answer

Need to wire cap

I am assuming this is a combo fan and compressor capacitor.
In american air conditioners the cap has 3 sections all clear marked. The fan has an F and only 2 terminals, the compressor has a HERM (for hermedically sealed compressor) and only 3 terminals. The cap also Has a C for common with 4 terminals. What you want to do is connect a start wire from the fan which is usually a small plain brown wire to the F terminals. You would want to connect a start wire from the compressor which is a heavy wire to the Herm terminals. Then the compressor and fan both have a common wire those go to the C along with one side of the Power cord. The fan common wire can be purple or white. If you decide NOT to use the white wire for common you be sure to tape it off. Then you can use the brown wire with the white stripe fro common. The other side of the power cord will receive the RUN wires from the fan and the compressor. Note: If the fan has multiple speeds you must ONLY connect one speed at a time. Speeds are normally Black for high, Blue for medium and Red for low. So if your intent was to maybe bypass a switch or board you would tape off the blue wire and the red wire seperately and use the black wire for a high speed fan.

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Hi and welcome to the site,

To my recollection, wiring of a Windjammer:
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The remaining wire (blue or red) you tape off.
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If this helps you please rate me accordingly and good luck.

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RV AC, how to wire fan (blower) motor to capacitor.

You almost have it Look closer at the run capacitor. It has Herm, this is for the compressor, Com or C and F or Fan.

1 of your power wires is the fan speed so connect them accordingly usually black is hi, blue med, & red is low. You are "feeding" voltage to the selector switch on 1 side and coming out to the fan motor speeds.

Next you have a "Common" wire on your fan motor (this means its Common to all the other connections inside the fan motor to me. It is usually white. Connect this to the other line of power usually the Com on the capacitor unless it connects to a strip on the selector switch. But 1 of these 2 places will be the other side of your Power when plugged in. Lastly the brown it is usually the fan capicator only wire and it will connect to the fan "F" terminal on the capicator this terminal will not have any other wires connected to it.

This should make you a happy camper. Please rate me accordingly and good luck.

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