5700 23RD DR W 2017 Plans 2022-10-27 (5)

o (DOAS)which delivers 100 percent outdoor air without of this section,impractical means that an HVAC system : � e requiring operation of the heating and cooling system fans complying with Section C403.6 cannot effectively be : � a for ventilation air delivery. utilized due to an unusual use or configuration of the a v Exceptions: building. � a 1. Occupied spaces that are not ventilated by a : o mechanical ventilation system and are only C403.7 High efficiency variable air volume(VA� . o ventilated by a natural ventilation system per systems.For HVAC systems subject to the requirements s : Section 402 of the International Mechanical of Section C403.6 but utilizing Exception 2 of that � . section,a high efficiency VAV system may be provided . o Code. without a separate parallel DOAS when the system is : . 2. High efficiency variable air volume(VAV) designed,installed,and configured to comply with all of o � o systems complying with Section C403.7.This the following criteria(this exception shall not be used as a : � exception shall not be used as a substitution for a substitution for a DOAS per Section C406.6 or as a : o DOAS per Section C406.6 or as a modification modification to the requirements for the Standard ° o to the requirements for the Standard Reference : o Design per Section C407 Reference Design per Section C407): � ■ 1. The VAV systems are provided with airside a : C403.6.1 Energy recovery ventilation with DOAS. economizer per Section 403.3 without exceptions. : : The DOAS shall include either energy recovery 2. A direct-digital control(DDC)system is provided tl : ventilation that complies with the minimum energy to control the VAV air handling units and ' : recovery efficiency and energy recovery bypass associated terminal units per Section C403.2.4.12 : : requirements,where applicable,of Section C403.5.1. regardless of sizing thresholds of Table : Exceptions: C403.2.4.12.1. : : 1. Occupied spaces under the threshold of 3. Multiple-zone VAV systems with a minimum � 0 Section C403.5 with an average occupant load outdoor air requirement of 2,500 cfm(1180 L/s)or : s gr2 ater than 25 people per 1000 square feet(93 greater shall be equipped with a device capable of o s m )of floor area(as established in Table measuring outdoor airfiow intake under all load a 0 403.3.1.1 of the International Mechanical conditions.The system shall be capable of � s Code)that include demand control ventilation increasing or reducing the outdoor airflow intake a . configured to reduce outdoor air by at least based on feedback from the VAV terminal units as a � � 50%below design minimum ventilation rates required by Section C403.4.4.3,without : s when the actual occupancy of the space served exceptions,and Section C403.2.6.2 demand : � by the system is less than the design controlled ventilation. e � occupancy. 4. Multiple-zone VAV systems with a minimum � . 2. Systems installed for the sole purpose of , : providing makeup air for systems exhausting outdoor airrequirement of 2,500 cfm(1180 L/s)or . � toxic,flammable,paint,or corrosive fumes or greater shall be equipped with a device capable of a : dust,dryer exhaust,or commercial kitchen measuring supply airflow to the VAV terminal . : hoods used for collecting and removing grease units under all load conditions. � : vapors and smoke. 5. In addition to meeting the zone isolation � ; requirements of C403.2.4.4 a single VAV air � . C403.6.2 Heating/cooling system fan controls. handling unit shall not serve more than 50,000 : : Heating and cooling equipment fans,heating and square feet(2323 m2)unless a single floor is o � cooling circulation pumps,and terminal unit fans shall greater than 50,000 square feet(2323 m2)in which : a cycle off and terminal unit primary cooling air shall be case the air handler is permitted to serve the entire r : shut off when there is no call for heating or cooling in floor. : : the zone. 6. The primary ma�cimum cooling air for the VAV � � Exception: Fans used for heating and cooling using terminal units serving interior cooling load driven s . less than 0.12 watts per cfm may operate when space zones shall be sized for a supply air temperature e a temperatures are within the setpoint deadband that is a minimum of 5°F greater than the supply air � : (Section C403.2.4.1.2)to provide destratification and temperature for the exterior zones in cooling. � : air mixing in the space. ■ . 7. Air terminal units with a minimum primary airflow ■ o C403.6.3 Impracticality. Where the code official setpoint of 50%or gre�ter of the maximum �e s determines full compliance with all of the requirements primary airflow setpoint shall be sized with an inlet : : of Section C403.6.1 and C403.6.2 would be velocity of no greater than 900 feet per minute. a � impractical,it is permissible to provide an approved 8. DDC systems be designed and configured per the o n alternate means of compliance that achieves a guidelines set by High Yerformance Seyziences of . : comparable level of energy efficiency.For the purposes Operation for HfiAC Systems(ASHRAE GPC 36, : RP-1455). a 2015 Washington State Energy Code CE-69