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// CODE SNIPPET

6.5.5.2 Fan Speed Control

Energy Standard for Buildings Except Low-Rise Residential Buildings 2016 of Illinois > 6 Heating, Ventilating, and Air Conditioning > 6.5 Prescriptive Path > 6.5.5 Heat-Rejection Equipment > 6.5.5.2 Fan Speed Control
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6.5.5.2.1

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
  1. Condenser fans serving multiple refrigerant or fluid cooling circuits.
  2. Condenser fans serving flooded condensers.

6.5.5.2.2

Multicell heat-rejection equipment with variable-speed fan drives shall
  1. operate the maximum number of fans allowed that comply with the manufacturer's requirements for all system components and
  2. 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


6.5.5.2 Heating, Ventilating, and Air Conditioning, Fan Speed Control
factor, totaling 5 hp or more shall have controls and/or devices (such as variable-speed control ) that shall result in fan motor demand ...
Energy Standard for Buildings Except Low-Rise Residential Buildings 2016 of Illinois > 6 Heating, Ventilating, and Air Conditioning > 6.5 Prescriptive Path > 6.5.5 Heat-Rejection Equipment > 6.5.5.2 Fan Speed Control
C403.9.1 [CE] Commercial Energy Efficiency, Fan Speed Control
) or more shall have controls and devices configured to automatically modulate the fan speed to control the leaving fluid temperature or condensing ...
2018 Illinois Energy Conservation Code Standards for Privately Funded Commercial Facilities and Standards for Residential Buildings > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.9 Heat Rejection Equipment > C403.9.1 Fan Speed Control
6.1.1.3.1 Heating, Ventilating, and Air Conditioning,
, " Boiler Turndown" 6.5.4.3, "Chiller and Boiler Isolation" 6.5.5.2, "Fan Speed Control " ...
Energy Standard for Buildings Except Low-Rise Residential Buildings 2016 of Illinois > 6 Heating, Ventilating, and Air Conditioning > 6.1 General > 6.1.1 Scope > 6.1.1.3 Alterations to Heating, Ventilating, Air Conditioning, and Refrigeration in Existing Buildings > 6.1.1.3.1
C403.8.5 [CE] Commercial Energy Efficiency, Fan Control
control. Low or minimum speed shall not be greater than 66 percent of full speed. At low or minimum speed, the fan system shall draw not more than 40 ...
2018 Illinois Energy Conservation Code Standards for Privately Funded Commercial Facilities and Standards for Residential Buildings > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.8 Fans and Fan Controls > C403.8.5 Fan Control
6.1.1.3 Heating, Ventilating, and Air Conditioning, Alterations to Heating, Ventilating, Air Conditioning, and Refrigeration in Existing Buildings
, " Boiler Turndown" 6.5.4.3, "Chiller and Boiler Isolation" 6.5.5.2, "Fan Speed Control ...
Energy Standard for Buildings Except Low-Rise Residential Buildings 2016 of Illinois > 6 Heating, Ventilating, and Air Conditioning > 6.1 General > 6.1.1 Scope > 6.1.1.3 Alterations to Heating, Ventilating, Air Conditioning, and Refrigeration in Existing Buildings
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