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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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Hi, the 2 - brown wires are for there own run capacitor they should have sold you. One of the browns will have a white stripe. The new cap has only 2- terminals and you put a brown on each side. The black and yellow wires are both hot which 1- will go to 120 volts on the load or out side of the contactor, and the same with yellow, 120 volts. This gives you 220 volts to run the motor. Look on the new motor and you will have a diagram or on a paper that comes in the box. The old motor used the dual cap to run the compressor to. The green is just a ground wire. Screw it to any metal part or screw. You should be able to put the black and yellow hot wires where the old black, red, or blue were as long as they are 120 volts which I am sure they are. Get a cheap tester when you go get the cap for the new motor, and check the old blk, red, and blue terminals to ground and you should have 120 volts on at least 2 of them. Put the new yellow to 1 and black to another, browns to the new cap and your off and running. Keep me posted. I do this everyday. Please be kind when rating me, thank you.
Shastalaker7
A/C, Heating Contractor

Posted on Jul 09, 2010

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1 Answer

Need wire color diagram


Black = AC hot
Red = switched AC hot
Yellow = AC hot from a another source - another control panel as an example.
White = neutral
red w/white tracer = switched neutral
Green or green w/ yellow tracer = ground/earth ground
blue = DC voltage, ie, 12vdc, 24vdc
white w/blue tracer = dc common
Brown = AC 3 pahse - phase A
Orange = AC 3 pahse - phase B
Yellow = AC 3 Phase - phase C
shileds: think of current loops
2 cond
clear or red = +
black = -(neg)
3 cond
red = power (24vdc typically for transducers)
clear = + (signal output)
black = - (signal common)
Hope this helps, oh, and any panel I have design and wired this way is easily understaood by 99% of all service and electrical people I have worked with.

Apr 15, 2015 | Cars & Trucks

1 Answer

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.

Dec 23, 2014 | GE Heating & Cooling

1 Answer

Need to change a broken blower motor in RUUD central air unit. Old central air blower motor (GE electric) was connected with brown and orange wire to 15 MHD capacitor. Another orange wire from central air...


on the motor should be a diagram detailing the wires. brown white goes to either side of the capacitor and brown wire to other side of capacitor. hi speed goes to normally open contact on the indoor fan relay and the wire designated common on the motor goes to the other side of power from the relay contacts.

Oct 03, 2012 | Heating & Cooling

1 Answer

I have a new fan motor for a ge for a ac unit for outside home and the old is a 4 wire and new is a 3 wire has black,yellow,brown the old 1 has black,brown,red,blue or purple wire how do i rewire thie...


this soounnds as though it for a 2 spped fan motor look at the old motor and see the RPM and then look at the new motor plate it shuld show ou which wire is for the speed required. Hope this helps ..Jon

Jul 25, 2011 | Heating & Cooling

1 Answer

I have a bryant model 702b packaged unit with 5 wire thermostat wiring coming out of the unit. R Y B G and W. The thermostate in the house is 5 wire and goes to the old central unit and them has a 4 ire...


R-Red is power
Y-Yellow is cool
B-Blue is cool as well
G-Green is fan leg
W-White is usually heat Leg


If you have no indoor unit and this is a ac/gas or
electric outdoor unit try this.

R to R/Red to Red
G-G/Green to Green
Y-Y/Yellow to Yellow
W-W/White to White
-Dont Hook up Blue.

Turn power back on turn the fan to on,fan should run
Turn to Heating, heating should come on
Turn on Cooling,if cooling does not come on switch yellow with blue.

Jul 02, 2010 | Heating & Cooling

1 Answer

Thermostat Wiring Problems!!!


. your blue is probably common and if you hooked it to Y you shorted the transformer or blew the low voltage fuse. Green is fan, yellow is AC, Red is 24volt. Is it a heatpump or just ac? I think its probably a heat pump and your brown is your Reversing valve it needs to be hooked to O on the new stat. If its a heatpump your tstat must be a 2heat 1 cool stat w/ aux heat. Without knowing what terminals the wire were hooked to on the old stat you may have to look at whats hooked up at airhandler( furnace) and on A/C (heatpump) tobe able to determine what goes where on the new one.

Sep 20, 2009 | Heating & Cooling

1 Answer

I am replacing the a/c blower motor and capacitor. The old motor has 1 brown wire to the capacitor, 1 yellow wire to the capacitor (the yellow then loops from the capacitor over to the wiring panel), 1...


Motor Wiring
Old Motor
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
New Motor
White goes to the Yellow wire from the capacitor
Black goes to the Black wire you took off of high speed on old motor
Of course both Brown wires go to the capacitor and Green to ground
If a capacitor doesn’t discharge it doesn’t mean it’s bad
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.

Apr 27, 2009 | Heating & Cooling

1 Answer

Replacing blower motor in furnace w/Fasco brand #D727


Some one missed the wiring diagram. I believe its like this:
L1 = Line 1 = (Hot all are same thing)
Black Hi
Blue Med
Red LO
Now usually the black is for AC and connects to a normally Open (NO) contact on the blower relay.
The heater speed (either red or blue) go the the normally Closed (NC) on the blower relay and on one side of this wire or contact on the relay it goes to the heating blower thermostat on the furnace.
The remaining wire (blue or red) you tape off.
L1 also feeds the Run Capacitor on 1 side and the Brown wire feeds the opposite side

The white wire is Neutral and goes to the neutral on the main line.

If this helps you please rate me accordingly and good luck.








Mar 13, 2009 | Kitchen Appliances - Others

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