I bought a direct replacement blower for my furnace but when it arrived I noticed two wires were crossed. the original motor has a red, white, and black wire in the connector. The new one has a fourth (blue) wire and it is in the slot where the black wire is on the old motor. Would it be safe to assume that this blue wire can be removed and the black wire moved into the same spot without causing problems? The old motor had a green wire connected from motor chassis to fan housing.
I managed to find a photo of the old motor and found an image of the replacement online. Hope this helps, thanks for all the help.
Best Answer
Yes you are correct. That will increase your fan speed a little in cooling or fan only mode. The white wire is the common the colored wires are the speed taps. Black is high, red is low and blue is medium. Cap one of the colored wires and use the other two. Usually the black is for cooling and the red is for heating but having the 3 wires gives you options for the fan speed. If you are unsure if there is enough air to cool the furnace properly use the highest speed. The brown wires are for the capacitor which must be replaced at the same time with the matching micro farad rating as the motor.