Multicell heat rejection equipment with variable-speed fan drives shall:
- Operate the maximum number of fans allowed that comply with the manufacturer's requirements for all system components.
- Control all fans to the same fan speed required for the instantaneous cooling duty, as opposed to staged (on/off) operation. Minimum fan speed shall comply with the minimum allowable speed of the fan drive system per the manufacturer's recommendations. [ASHRAE 90.1:184.108.40.206.2]