LOCK OPEN AND TAG heater electrical disconnect before working on this equipment. Otherwise, one leg of the 3-leg heater remains energized.
Controls: No periodic preventive maintenance is necessary.
Fan Motor and Wheel
The fan motor and wheel are accessible from the bottom of the unit. Remove the bottom panel to check the wiring or remove the fan wheel or motor.
The PSC motors are equipped with long life sleeve bearings with non-detergent SAE 20 oil biannually
NOTE: The ECM motor has permanently lubricated ball bearings that require NO maintenance.
Disconnect power to unit before touching fan motor wiring, or electrical shock or personal injury could result.
Fan Motor Wiring: Refer to the fan motor wiring details shown on the wiring diagram attached to the unit. Failure to reconnect the fan properly can cause damage to the motor and/or serious personal injury.
Fan Motor Maintenance
Unit motors are equipped with permanently lubricated bearings. Inspect fan and motor assembly for accumulation of dust and dirt as required by operating environment. Clean as necessary. See Fig. 18-20 for motor wiring.
If fan motor does not run:
If fan motor runs, excessive noise:
If fan motor runs, insufficient airflow:
If repair or replacement is required:
Source: Carrier (www.shareddocs.com)