How can I do this? My previous motor was only 1 speed. The new one is 3. I am assuming this my cause a conflict but Ive heard you dont have to use 3 speeds. But how exactly do I adjust this?
You should wire the new motor the same way the old motor was wired up speed wise. Before removing any wires have a full understanding of what the equipment needs are. Many Air Handlers have two speeds for a reason, and say if you leave out the low speed for heat you will open the fuse links in the heater next time you use them.
It will only be one speed unless your furnace is wired for a multi-speed fan it's hooked up to a thermostat that has several fan speed options. A multi-speed fan is more efficient - you may want to rethink your question check and see if the furnace is set up for multiple speeds.
if you look at the instructions for the motor you just purchased it should show you what wires to hook up for low med and hi speeds. Most of these motors also tell you what wires to use for single speed use. If not then find what speed your motor was operating at and hook the new motor up to operate at approx the same rpm's.
The white wire is neutral, always. The rest are speeds. The black is normally high speed. Red is normally medium, and blue is low. . A quick check on the side of the motor will verify this, but if you are using this for air conditioning, high speed is what you want.
Just use the common and the wire that is designated for the speed you need, wire nut and tape the unused wires individually. Speed changes are usually accomplished by means of a relay, switching connections to the different wires which lead to the motor windings. Air conditioning usually runs on high and heat on a lower speed but this is not true for all systems. Usually, using a system as it iwas designed is best.
