C403.4.3.2.1 Fan Motors Not Less Than 7.5 HP
Each fan powered by a motor of 7.5 hp (5.6 kW) or larger shall have the capability to operate that fan at two-thirds of full speed or less, and shall have controls that automatically change the fan speed to control the leaving fluid temperature or condensing temperature/pressure of the heat rejection device.
Exception: The following fan motors over 7.5 hp (5.6 kW) are exempt:
- Condenser fans serving multiple refrigerant circuits.
- Condenser fans serving flooded condensers.
- Installations located in Climate Zones 1 and 2.