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E 503.5.8.2 Variable-Speed Fan Drives
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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 90.1:126.96.36.199.2]