Hello, I have a 4 year old Trane XR12 unit. Recently the compressor fan is noisy, and now stops when when under power after 5-10 min. The main fuses and breakers are fine, the fan spins freely when turned, the contactor pulls in fine, the dual capacitor checks out. But, the wiring of the capacitor does not match wire diagrams. Could this have caused the fan motor to prematurely fail?..............................Terminal: C red wire, FAN brown wire, HERM has both orange and purple. Schematic shows the purple wire should be with red wire on common C. The purple also leads to fan.
Hi, I looked at the schematic on-line. If you still have the original fan motor in the unit then you are correct. The center terminal on the capacitor should have the red wire from the T1 terminal of the contactor, the red wire from the compressor, and the purple wire from the fan. The FAN terminal should have the brown wire from the fan. The HERM terminal should have the orange wire from the compressor. The black wire from the fan and the black/blue wire from the compressor should lead back to the T2 terminal of the contactor. Again, that is if the motor is the original motor. If it was replaced at some point in time, the wiring colors can change from manufacturer to manufacturer, in which case it's possible that the new motor is wired correctly. There should be a diagram on the motor to show you the correct wiring configuration.
