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cooling to the zonr.. <br /> �• Outdoor air supply and ezhaust systcros must have motoriml dampers that automatically shut when .he systans or <br /> spaces scrvcd;uc not in usc. Dampers must bc capablc ofautomatically shutting offduring prcoccvpancy building <br /> � wann-up, cool�own, and setback, exce�t when ventilation roduc� energy costs (e.g., night purge)or when <br /> vrntilation must be supplicd to mect codc rcquimnalls. Both outdoor air supply and exhaust air dampers must have <br /> a maximum leakagc rate of3 c8n/Y2 az 1.0 in w.g, whrn tcsted in accordance with AMCA Standard 500. <br /> -lxccption: Grevity(non-mororized)damP� ��>table in buildings less than three stories in height. <br /> -Excep(ion: Systans with a design oulside air intake or exhaust capacity of300 c6n (140 Us)or Iess that are <br /> al�ipped with motor opetatcd dampers that open and close whrn the unit is energized and de<nergizcd, re�p�i���y <br /> 9. Stair and elevator shat vents must be equipped wuh motoriud dampers ca�ay�e ofbeing automatically closed during <br /> nortnal building operation and interlocked to open ac reyuirod by firc and smokc dMection systems. All grdvity <br /> outdoor air snPP�Y�d cxhaust hoods, vrnts, and ventilators must be equippcd with motorizod dampers that will <br /> autamatically shut when the sPxes served are nol in use. <br /> Exttptions: <br /> -Gravity(non-motorizod)damppS a�c a�ptable in buildings Icss than thtec storics in height above grade. <br /> -Ventilation systems serving unconditioned spaces, <br /> 10. Whae a mne is servoc;by a systcm(s)with both humidification and dchumidification capability, means (such u <br /> limit switd�es, mcchaniral stops, or sotwarc p�ugrunm�no)must bc provided to p�v¢nt simultancous operation of <br /> humidification and dehumidi6cation equipment. <br /> -Exaption: Zones s�xved by desiccant systems, usod with dirtxt evapora�ive cooling in saies; Systems serving <br /> zoncs whcre spaific hwuidity levcls an;rcyuitod. <br /> 1 L All feeze protaction systems, including selEregulating h�t tiacing, must include automatic controls capable of <br /> shutting offthe systems whrn outside air temperat�res a���e 40 dcgrce F or w1�cn the conditions ofthe protacted <br /> �uid will prevent i��g. Snow-and icc-mclting systems must include automatic controls capab�e ofshutting offthe <br /> systems when the pavem¢�t temPe�ature is above 50 degree F and no precipitatfon is 511ing, and an automatic or <br /> manual conlrol that will allow shutoffwhen the outdoor tanppature is above 40 degree F. <br /> i 12. Systans with design outside air capacities>3,ppp cin serving amas having an average dcsigr.oavpancy density <br /> ��1°g ��!'�P�z P� 1000 i2 must include means to automatically reduce outside air intake below design rates <br /> when spaas a�e part�al�y�P�� y����ation controls must be in compliance with ASHRAE Standar+d 62 and local <br /> standards. <br /> 13. Duct and pipe insulation exposed to weather must be suitable 6r outdoor service; e.g., proteded by aluminum, sheet <br /> mMal, paintal camas, or plastic cover, Cellular 6am insulation must be protectecl as above or painted with a coazing <br /> that is watcr rctanla�t and P�o��da shielding fom solar rddfazion that can puse dcgredation ofthe matetial.Insulation <br /> covering chilled water pip�ng, refigerant suction piping, or cooling ducts located outside the conditioned space must <br /> include a vapor retardant �oca�e�outside the insulation(unless the insulation is inhercntly vapor ayardan�)� �� <br /> penetrations and joints ofwhich must be sealed. <br /> 14. R-6 supply and retum air duct insulation in unconditioned spaces <br /> R-8 supply and rctum air duct insulation outsidc the building <br /> R-8 insulalion bMwccn ducts and thc building p;tcrior whrn duds arc part ofa building asscmbly <br /> R-3 supply and rtum air duct insulation underground <br /> 15. Dun Spling Itcquircmrnts: <br /> -Prcsswc scnsitivc tapc prohibitcd as thc primary sealant <br /> -Longitudinal and transverse savns 6r duMs in unconditioned spaces <br /> -Longitudinal and tcuisverse seams a��d duct wall penMrations 6r ducts outside the building <br /> -Trnnsvcrsc sr.uns on buricd ducts <br /> 16. HVAC contmi systems must be tested ro ensum control elements are caliyrated� adjusted, and in proyer working <br /> condition.For projccts larger than 50,000 t2 conditioned arp except warchouscs and semihqted spaccs, dMailod <br /> ins�mctions f�r commissioning HVAC systems must be providcd by the dcsigna in plans and spoci6cations. <br /> 17• Wherc humidistatic controls arc pro��de�i� such controls must p�eve�t reheating, mixing ofhot and cold air streams, <br /> or othcr mc��s ofsimulta�icous hcating and moling ofthc samc air strcam. <br /> � Exccptiuns: <br /> -canability to first reduce Auw ratc <br /> � J <br />