Replacing Condenser AC Fan Motor (Step by Step Instructions!)

Introduction

This tutorial provides step-by-step instructions for replacing a condenser AC fan motor, a common issue when your air conditioning unit is not functioning properly. By following these steps, you can save on labor costs and ensure your AC is running efficiently.

Step 1: Prepare for Replacement

• Safety First: Disconnect power to your AC unit to avoid electrical hazards.
• Allow Cooling Time: Let the existing fan motor cool down, as it can be extremely hot.
• Remove Face Plate: Unscrew and take off the face plate that covers the fan motor.

Step 2: Access the Electrical Components

• Remove the Panel: Take off the access panel to reach the contactor and capacitor.
• Disconnect Wires: Follow the wires from the fan motor to the capacitor and contactor, and disconnect them carefully.

Step 3: Remove the Old Fan Motor

• Feed Wires Through: Pull the wires through the unit to free up space for the new motor.
• Lubricate Connections: Apply lubricant where the fan blade attaches to the shaft to ease removal.
• Remove Fan Blade:
  • Loosen the set screw on the blade.
  • If it's stuck, use a fan blade puller for assistance.
• Unscrew Motor: Remove the nuts fastening the fan motor to the face plate.

Step 4: Prepare the New Fan Motor

• Compare Motors: Check the new motor against the old one to ensure compatibility.
• Extend Wires if Necessary: If the new motor's wires are shorter, cut the old wires and splice them to extend.
  • Use butt splice couplers or wire nuts to secure connections.
• Insulate Connections: Wrap any exposed wire ends with electrical tape for safety.

Step 5: Install the New Fan Motor

• Attach Sleeve: Reattach the sleeve from the old motor to the new one.
• Connect Wires:
  • Connect the ground wire to the motor frame.
  • Wire according to your capacitor setup; typically, black goes to the contactor, yellow to the capacitor marked ‘C’, and the br wire to the fan terminal.
• Secure Motor: Tighten all screws to fasten the motor to the face plate.

Step 6: Final Adjustments and Testing

• Cut Shaft if Necessary: If the shaft extends too far, trim it down for better blade positioning.
• Zip Tie Wires: Organize and zip tie any loose wires to prevent them from moving during operation.
• Reattach Panel: Put the access panel back in place securely.

Step 7: Power Up and Test

• Turn on System: Restore power to the AC unit.
• Check Airflow Direction: Ensure the air is blowing upwards. If not, swap the connections of the reversible motor wires.
• Set Thermostat: Adjust the thermostat to the desired setting and check if the system operates properly.

Conclusion

Replacing a condenser AC fan motor is a manageable task that can save you money. Remember to follow safety precautions, ensure proper wiring, and confirm airflow direction after installation. If you encounter difficulties or the problem persists, consider consulting a professional. Happy DIYing!