Since a condenser fan motor will get rained on and be exposed to the elements, it’s rated for use outdoors sealed up on the ends and sides to keep water out. These motors are usually one speed and come in horsepower ranges from 1/6 hp to 1/3 hp. They always have a capacitor, usually a dual capacitor if it’s an original motor and a single capacitor if it’s a replacement aftermarket motor. The factory motor usually has three wires and the aftermarket version usually has 4 wires.
The main thing to remember on a condenser fan motor is the main service issue is usually a bad capacitor. This issue generally surfaces during summer, when the weather is hottest. If the motor is bad, measure the fan blade height to the finger guard before you ever remove it. The placement of the blade is absolutely paramount to the operation of the condenser, even more so than its original placement on the motor shaft. Consequently, you should always keep any replacement fan blades at the exact same height, since getting this blade height wrong by even an inch can mean the compressor will overheat and burn out.
If you need to replace the condenser fan motor and capacitor, take note of these key pieces of information first:
Above all, never try to force the replacement blade onto the motor. After all, a motor is easy to replace while the correct fan blade might take you weeks to find.
Finally, don’t fall back on the assumption that you can simply substitute a different pitch blade when necessary. The wrong size or type will not work and may overheat the fan motor or simply not move enough air, meaning that the AC unit won’t do its job. Airflow at the condenser is critical.
Contact Person: Ms. Amanda Gu