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I <br /> Chapter 3-System Design <br /> CHAPTER III <br /> ! SYSTEM DESIGN <br /> ' G�'NERAI. � a maximum of 34 in.It can also protect a round duct with a <br /> � This section wi12 caver the proger design of the Protex Series II , maximum diameter of 31-718 in. <br /> Restanrant Fire Suppression System.It is divided into four(4) <br /> sections: Two(2)NL2D duct nozzles can protect a square or rectangular <br /> � duct with a maximum of 150 in.perimeter,with the Iongest side <br /> •Cylinder Sizing being a maximurn of 5J.in.They can also protect a round duct <br /> with a maximum diameter of 47-112 in. <br /> •Nozzle Coverage and Placement <br /> When two(2)NL2D duct nozzles are used to protect a single <br /> •Piping Limitations ; duct,the cross sectional area of the duct must be divided inta two <br /> equal syrnmetrical areas.The nozzle must then be installed on the <br /> •Detectar Requirements centerline of the area it pratects and aimed directly into the duct <br /> opening. <br /> Each of these sections must be completly understaod before <br /> attempting any installation. The nozzle(s)must be instaIled on the centerline of the duct,with <br /> ! the tip lacated 0 to 6 in.into the opening,and aimed directly into <br /> 1. SYSTEM CYLINDER SIZING � the duct opening.See Figure 3-1. <br /> i Each of the nazzles in the section,"Nazzle Caverage and <br /> Placement"has its own fIow point value.Each of the four ! <br /> different agent tanks can support a maximum number of <br /> ' flowpaints,based on the volume af the pipe used.Select the <br /> system tank(s)by calculating the total number of flow points <br />� associated with the appIiances{s},plenum,and ducts,pIus the total <br /> piping volume. °-s tN. <br /> , ` INTO C1UCT <br /> \ <br /> 2D NOZaE �'1 <br /> 'i` <br /> �s. C1�.UTION ._i� � <br /> Do not exceed the m�imum number of flawpoints as shown � <br /> on the Tank Chart,page 48,If the number of flow points � <br /> or the pipe volume required exceeds the arnounts shown, � �tz w <br /> ------......a---_.__.---�--• w <br /> additional tank(s)ar changes in pipzng design are required. , � <br /> � <br /> �i!2 L <br /> 2.Nt3ZZLE COVERAGE ANI7 <br /> PLACEMENT ` <br /> This section will provide guidelines for determining nozzle <br /> type,pasitioning,and quantity for duct,plenum,and appliance Figure 3-1 <br /> protection. QNE-FLOW DUCT PROT�CTIUN WITH iL NOZZLE <br /> �P/N NL1L) <br /> A.DUCT PRC}TECTI{}N <br /> It is not required that the fan be shuC down ar the exhaust duct � The 1L Nozzle(P/N NT,1L)is capable af protecting square or <br /> be dampered far the system to aperate properly.Each nozzle is i rectangutaz ducts with a maacimun perimzter af50 in.{127 cm.}, <br /> approved to protect eachaust ducts ofunlimited length. ' with the longest side being a maacimum of 17 in.(43.2 em.).It can <br /> also protect a round duct with a ma�cimum diameter of 16 in.{40.6 <br /> Duct protection requires thaY a nozzle be positioned to discharge em.}See figures 3-2&3-3. <br /> up,into the duct.Either a P/N NL1L or a P/N NL2D can be <br /> i used.The NL2D duct naazle is a two(2)flow nozzle.A singIe ,.�-+ <br /> NL2D nozzle is capable of protecting square or rectangular duct �`�Y���''�+��'.�:� ��� <br /> with a maximum of lOQ in.perimeter,with the longest side being P�' �'�'��'�'��'��`��A u� <br /> �,�t+��;s,�,��-aq�1,�.5. <br /> UL EX4521 December 12,2006 11 Page rev.C <br /> Part#10053 <br />� I <br />