840 N BROADWAY 2017-08-21 - Laserfiche WebLink

pressure set point equals 1/3 the total design static C403.3 Economizers(Prescriptive).Air economizers pressure,and 50 percent of design water flow for shall be provided on all new systems including those pumps,based on manufacturer's certified test data. serving computer server rooms,electronic equipment, Variable inlet vanes,throttling valves(dampers), radio equipment,and telephone switchgear.Economizers scroll dampers or bypass circuits shall not be allowed. shall comply with Sections C403.3.1 through C403.3. 4. Exception:Variable speed devices are not Exception:Economizers are not required for the required for motors that serve: systems listed below: 1. Fans or pumps in packaged equipment where 1. Systems complying with Section C403.6 variable speed drives are not available as a Dedicated outdoor air systems(DOAS)with factory option from the equipment year-round cooling loads from lights and manufacturer. equipment of less than 5 watts per square foot. 2. Fans or pumps that are required to operate 2. Unitary or packaged systems serving one zone only for emergency fire-life-safety events with dehumidification that affect other systems (e.g.,stairwell pressurization fans,elevator so as to increase the overall building energy pressurization fans,fire pumps,etc.). consumption.New humidification equipment shall comply with Section C403.2.3.4 C403.2.13.1 Heat rejection equipment.The 3. Unitary or packaged systems serving one zone • requirements of this section apply to heat rejection where the cooling efficiency meets or exceeds equipment used in comfort cooling systems such as the efficiency requirements in Table 0403.3. air-cooled condensers,open cooling towers, closed-circuit cooling towers,and evaporative 4. Water-cooled refrigeration equipment serving condensers. chilled beams and chilled ceiling space cooling Exception:Heat rejection devices included as an systems only which are provided with a water integral part of equipment listed in Tables economizer meeting the requirements of Section C403.2.3(1)through C403.2.3(3). C403.3.4. Heat rejection equipment shall have a minimum 5. Systems complying with all of the following efficiency performance not less than values specified criteria: in Table C403.2.3(8).These requirements apply to all 5.1. Consist of multiple water source heat propeller,axial fan and centrifugal fan cooling pumps connected to a common water loop. towers.Table C403.2.3(8)specifies requirements for 5.2. Have a minimum of 60 percent air air-cooled condensers that are within rating economizer. conditions specified within the table. 5.3. Have water source heat pumps with an • C403.2.13.1.1 Variable flow controls.Cooling EER at least 15 percent higher for cooling tower fans 7.5 hp and greater shall have control and a COP of at least 15 percent higher for devices that vary flow by controlling the leaving heating than that specified in Section fluid temperature or condenser C403.2.3. temperature/pressure of the heat rejection device. 5.4. Where provided,have a central boiler or 0403.2.13.1.2 Limitation on centrifugal fan furnace efficiency of 90 percent minimum cooling towers.Open cooling towers with a for units up to 199,000 Btu/h. combined rated capacity of 1,100 gpm and greater 5.5. Provide heat recovery with a minimum 50 at 95°F condenser water return,857 condenser percent heat recovery effectiveness as water supply and 75'F outdoor wet-bulb defined in Section C403.5 to preheat the temperature shall meet the energy efficiency outside air supply. : requirement for axial fan open circuit cooling 6. For Group R occupancies,cooling units installed towers. outdoors or in a mechanical room adjacent to C403.2.14 Electric motor efficiency.Electric motors, outdoors with a total cooling capacity less than including fractional hp motors,shall comply with the 20,000 Btu/h and other cooling units with a total provisions of Section C405.8. cooling capacity less than 54,000 Btu/h provided . that these are high-efficiency cooling equipment with IEER,SEER,and EER values more than 15 percent higher than minimum efficiencies listed in Tables C403.2.3 (1)through(3),in the appropriate size category,using the same test 2015 Washington State Energy Code CE-59 3��