// CODE SNIPPET
6.5.5.2 Fan Speed Control
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The fan system on a heat-rejection device powered by an individual motor or an array of motors with a connected power, including the motor service factor, totaling 5 hp or more shall have controls and/or devices (such as variable-speed control) that shall result in fan motor demand of no more than 30% of design wattage at 50% of the design airflow and that shall automatically modulate the fan speed to control the leaving fluid temperature or condensing temperature/pressure of the heat-rejection device.
Exceptions to 6.5.5.2.1
- Condenser fans serving multiple refrigerant or fluid cooling circuits.
- Condenser fans serving flooded condensers.
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 and
- 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.
Related Code Sections
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