Both motors should have wiring diagrams printed on them.. this could happen if a 3-speed motor is used to replace a 4-speed motor, and the installer choose which speed to disable.. Also, make sure your fan limit switch on your furnace is working (turn on thermostat to high and fan to auto and listen for furnace to start heating and watch.. Disclaimer. Not a good idea to plug wires into an outlet. Should use an extension cord or something. This was a testing set up for ease of filming and video.
The wiring diagram for a furnace blower motor typically includes information about the electrical connections, voltage requirements, and the various components involved.. The blower wheel is a fan-like component connected to the motor shaft.. The high-speed lead is usually marked with an "H" and is connected to the highest speed.. To the speed wire of the terminal, connect the speed terminal 1 to it. Then connect the speed terminal 2 to the medium-low speed wire of the motor. For speed terminal 3, connect it to the medium high-speed wire. Lastly, for speed terminal 4, connect it to the high-speed wire of your unit's Fasco blower motor. If there are any splices on the.