The Trane American Standard MOT18664 Condenser Fan Motor is an OEM replacement motor designed for compatible Trane and American Standard outdoor air-conditioning and heat pump systems.

Featuring 1/3 horsepower, 1100 RPM, and 200–230V single-phase operation, this motor powers the outdoor condenser fan, helping move air across the condenser coil to release heat from the refrigerant.

The MOT18664 features a 48-frame construction and Totally Enclosed Air-Over (TEAO) motor enclosure. This design uses airflow over the motor housing to assist with cooling during operation.

Its single-speed configuration delivers consistent fan operation when energized by the equipment's controls. The motor also features counterclockwise rotation when viewed from the lead end (CCWLE) and uses a 7.5 MFD run capacitor.

The Trane MOT18664 is intended for equipment-specific replacement where the manufacturer specifies this motor or an approved equivalent.

Key Features & Function

• Brand: Trane / American Standard

• Manufacturer Part Number: MOT18664

• Motor Type: Condenser Fan Motor

• Horsepower: 1/3 HP

• Voltage: 200–230 VAC

• Rated Speed: 1100 RPM

• Electrical Phase: Single Phase

• Number of Speeds: 1 – Single Speed

• Frame Size: 48

• Enclosure: Totally Enclosed Air-Over (TEAO)

• Rotation: CCW Lead End

• Specification Note: Trane's product data identifies the motor as 1100 RPM and lists an 8.81-inch shaft length. Some distributor listings use different speed or shaft-length measurements. Confirm physical dimensions and capacitor requirements against the original motor before installation.

  HVAC Depot Pro Tip

  A condenser fan motor that fails to start, runs slowly, overheats, or makes unusual noises can cause poor condenser airflow and reduced cooling performance.

  Before replacing the Trane MOT18664, check the motor's electrical supply, run capacitor, fan blade, and shaft condition.

  Recommended installation checks:

  1. Verify the outdoor unit model and serial number.

  2. Confirm the original motor part number.

  3. Check the 200–230V power supply.

  4. Inspect the condenser fan blade for damage or imbalance.

  5. Test the 7.5 MFD run capacitor.

  6. Verify counterclockwise lead-end rotation.

  7. Confirm shaft dimensions and mounting requirements.

  8. Check the motor's thermal protection and wiring.

  9. Measure operating amperage after installation.

  10. Verify proper outdoor condenser airflow.

  HVAC Depot Pro Tip: The MOT18664 is rated at 1100 RPM. Do not automatically substitute an 825 RPM or 1550 RPM motor simply because the horsepower and voltage match. Incorrect fan speed can affect condenser airflow and system performance.

  Important: Disconnect power before servicing. Motor capacitors can retain a dangerous electrical charge after power is removed.

  Equipment / Model Compatibility

  The Trane MOT18664 is designed for select Trane and American Standard outdoor condenser units.

  Examples of equipment models identified in replacement-parts listings include:

  • 4A7M3042A1000AA

  • 4A7M3048A1000AA

  • 4A7M3060A1000AA

  • 4TTM3042A1000AA

  • 4TTM3048A1000AA

  • 4TTM3060A1000AA

  These are reference applications, not a complete manufacturer-verified compatibility list. Confirm compatibility using the complete equipment model and serial number before ordering.

  Compatibility Notice: MOT18664 is not a universal condenser fan motor. Matching horsepower, voltage, and RPM alone does not guarantee compatibility.

  Run Capacitor: 7.5 MFD

• Shaft Diameter: 1/2 inch

• Thermal Protection: Yes

• Designed for compatible outdoor condenser assemblies