840 N BROADWAY 2017-08-21 - Laserfiche WebLink

TABLE C403.2.4.11.5 FAN CONTROL Cooling System Fan Motor Mechanical Type Size Cooling Capacity DX cooling Any >65,000 Btu/h Chilled water and >5 hp An evaporative > /a hp Any cooling C403.2.11.4 Group R occupancy exhaust fan of the power at full fan speed.Low or minimum efficacy.The Group R occupancies of the building speed shall be used during periods of low : shall be provided with ventilation that meets the cooling load and ventilation-only operation. requirements of the International Mechanical Code, 3. Units that include an airside economizer in as applicable,or with other approved means of accordance with Section C403.3 shall have not . ventilation.Mechanical ventilation system fans with fewer than two speeds of fan control during 400 cfm or less in capacity shall meet the efficacy economizer operation. requirements of Table C403.2.11.4. Exceptions: Exceptions: 1. Modulating fan control is not required for ■ 1. Group R heat recovery ventilator and energy chilled water and evaporative cooling units recovery ventilator fans that are less than 400 with fan motors of less than 1 hp(0.746 kW) cfin. where the units are not used to provide 2. Where whole house ventilation fans are ventilation air and the indoor fan cycles with integrated with forced-air systems that are the load. tested and listed HVAC equipment,they shall 2. Where the volume of outdoor air required to be powered by an electronically commutated comply with the ventilation requirements of : motor where required by Section C405.8 the International Mechanical Code at low : 3. Domestic clothes dryer booster fans,domestic speed exceeds the air that would be delivered range rood exhaust fans,and domestic range at the minimum speed defined in this section, booster fans that operate intermittently. the minimum speed shall be selected to C403.2.11.5 Fan airflow control.Each cooling provide the required ventilation air. system listed in Table C403.2.11.5 shall be designed C403.2.12 Heating outside a building.Systems to vary the indoor fan airflow as a function of load and installed to provide heat outside a building shall be shall comply with the following requirements: radiant systems. 1. Direct expansion(DX)and chilled water Such heating systems shall be controlled by an cooling units that control the capacity of the occupancy sensing device or a timer switch,so that the mechanical cooling directly based on space system is automatically deenergized when no occupants temperature shall have not fewer than two are present. stages of fan control.Low or minimum speed C403.2.13 Variable flow capacity.For fan and shall not be greater than 66 percent of full pump motors 7.5 hp and greater including motors in speed.At low or minimum speed,the fan or serving custom and packaged air handlers system shall draw not more than 40 percent of serving variable air volume fan systems,constant the fan power at full fan speed.Low or minimum speed shall be used during periods of volume fans,heating and cooling hydronic pumping low cooling load and ventilation-only systems,pool and service water pumping systems, domestic water pressure boosting systems,cooling operation. tower fan,and other pump or fan motors where 2. Other units including DX cooling units and variable flows are required,there shall be: chilled water units that control the space 1. Variable speed drives;or temperature by modulating the airflow to the space shall have modulating fan control. 2. Other controls and devices that will result in Minimum speed shall be not greater than 50 fan and pump motor demand of no more than percent of full speed.At minimum speed,the 30 percent of design wattage at 50 percent of fan system shall draw no more than 30 percent design air volume for fans when static CE-58 2015 Washington State Energy Code