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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.
DO YOU HAVE A WIRING DIAGRAM OF THE NEW MOTOR? TYPICALLY NEW MOTOR WILL HAVE OPTION FOR MULTIPLE SPEED MOTORS.
WIRES ON UNIT NEW MOTOR
OPTION 2 YELLOW=MED/LOW
OPTION 3 BLUE=MED/HI
OPTION 4 BLACK=HI
the (white) wire is likely the neutral, red - low speed, blue - high speed.they would typically be connected thru a selector switch. however, best guess is that white would hook to incoming white neutral, and blue (or red, but not both at the same time) would hook to incoming black (hot) wire.
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.
I have a GE P547BS fan motor. I find replace it with a Mars 10584 fan motor. GE has five wires, BRN, YEL,PUR,BLK,RED. Goes through the capacitor with the yellow going on to 200 V the purple and black go to 220 V. Mars motor as a six wire connection two Brown's go to the capacitor. yellow I'm assuming goes to the hot/neutral and a black I would say would be high-speed blue is medium and red is low. Now when I connect with this way it blows the fuse. Anybody run into this problem before? Any help? By the way, it's a 240 V single phase system.
These wire colors are the different speeds for the motor. You will have 1 wire going to the heat, 1 wire going to the cool, and 2 wires on the park terminals on the board if available. It will actually tell you the speeds of the colors provided on the motor itself i.e. BLACK=High and so on. Without knowing what model of unit you are working on, it's hard to say where exactly the wires will hook up, but the majority of the time you will have a electrical board inside the furnace and the terminals that I described will be marked. Hope this helps and good luck!