New answers tagged fans
If you want anything close to an accurate answer. You're going to have to tell us a bit more about the wiring between the thermostat and the furnace, or include some photos of the wiring. And include make, and model numbers for all the equipment involved. Most furnaces manage the blower themselves during a heat call, i.e. the thermostat simply energizes ...
Could be as simple as not moving air effectively when spinning the wrong way, so no load (or small load) on motor. Spin the right way, air is moved, motor slows down, work is done. Try blocking off the intake or output and see if the lack of air movement causes the fan (& motor) to speed up again.
You need to look at the wiring diagram for the motor, you may have a two or three speed motor and need to change the wire leads to the correct set for a higher speed.
You should be able squeeze one of the connection heads and pull them apart. Some light kit also have a little tab on the side of the connector that have to be push in or pulled apart to release them.
Switching the wire from W to G on both the thermostat and controller board allowed me to use the fan in the summer while disabling the heating call (W). For the winter I'll switch it back since it's a heat-only unit. Otherwise an extra wire from G(thermostat) -> G(controller) would have been needed.
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