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SECTION IV — SVSTE�11 DESIGN UL EX3470 ULC EX3470 Page 4-43.4 ■ 7-1-09 REV,0 OVERLAPPING NOZZLE COVERAGE(Continued) �Overlapping Coverage—Option 2 General Design Limltatlons For each group of protected applianceS under a common hood(s), . �f overlapping appliance protection is mixed with dedicated appli- the overlapping nozzles must be located from right to leR so that ance protection on the same pipe system,THE OVERLAPPING each end nozzie is located a maximum of 11.5 in.(29.2 cm)inside APPLtANCE PROTECTION PIPING REQUIREMENTS MUST the outside edge of the cooking hazard of each end appliance,and gE FOLLOWED. the inside overlapping nozzles must be located between the two �end nozzles at a maximum spacing of 25.5 in.(64.8 cm). '• Overlapping protection requires the �se of 3.0 gal (1 i.4 l.) Hazard Zone tank(s)and a maximum of six(6)flows per tank. The hazard zone is defined as a theorelical,flat and level,rectan- ' In installations using tanks only intended for overlapping protec- guEar surface,that includes all of the cooking hazards of the pro- tion,a single Double Tank nitrogen expellant gas cartridge can tected appliances under a common hood(s).The purpose of the be utilized with up to three(3)3.0 gal(11.4 L)tanks. hazard zone is to provide a means of Iocating the applfances and • In installations using both overlapping protection and conven- the overlapping nozzles, as well as aiming the overlappfng noz- tional non-overlapping protection (ex. hood/duct or dedicated zles.The hazard zone measures 28 in. (7i 1 mm} deep by the appliance protection), a single Double Tank nitrogen expellant length of the cooking hazard(s).The cen#erline of the hazard zone gas cartridge can be utilized wlth up to three(3)3.0 gal(19 4 L) must bisect ihe 28 in.(711 mm)depth(from(ront to back)and run tanks,as long as none of the 3.0 gal (11.4 L) tanks exceed a from right-to-left for the full width of lhe hazard zone. total flow output ot more than six(6)flows. • If more than six (6} flows wilV be used In a conventional non- Overlapping Nozzle Appliance Protection overlspping tank, it cannot share the same cartridge as tanks Overlapping Nozzle Appliance Protection is defined as protection intended for overlapping protection. In this case,an additionaf of coolcing appliances by nozzles spaced uniformly at unitorm ele- Regulated Actuator Assembly with another expellant gas car- vations under a common hood(s).Overlapping protection of appli- ► tridge will be required. ances is continuous for the tull length of the hood or divided when . �e 245 nozzle,Part No.419340,must be used for"end of zone" group(s) of protected appliances are separated by coun#ers or protection. applfences not requiring protection. Futl hood contlnuous protection is defined as overla in noz- ' The 280 nozzle, Part IVo.419341, must be used for zone pro- pP 9 tection. zle appliance proteCtion that covers the appliance line-up located under the total hood length.All appliances requlring protection are ' ' Maximum depth of zona is 28 in.(71.1 cm). the appliances under the hood that can be an ignition source of • Refer to overlapping system piping requiremants listed ln Table 2. grease in the hood,grease removak device or the duct. ► . Nozzle must be located 0 in.to 12 in.(0 cm to 30.5 cm)forward Group protection is defined as overlapping nozzle appliance pra of zone centerline,aimed back at the zone centerline. tection that protects individual hazard zones located under a com- . . Nozzles must be spaced a maximum of 11.5 in.(29.2 cm)from mon hood.These "groups" of appliances may be separated by � appliances noF requiring protection,such as steam equipment or each end of hazard and then a maximum of 25.5 in.(64.8 em) work iables, or by dedicated appliance protection,such as sala- on center for the remaining overlapping nozzles until the com- mander broilers. plete hazard is covered. �See Figure 95 {full hood continuous protection) and Figure 96 (multiple group protection). • �or appliance hazard surfaces with Ilsted protection exceed- ing ihe standard hazard ione of 28 in.(71 cm)in depth,the haz- Dedlcated�lozzle Appliance Protectlon ard surface(s)must be aligned with the back edge of the hazard Appliance protection using dedicated nozzle coverage is defined zone,with the front edge overhanging the front edge of the zone. as protection of cooking appliances with enclosed cooking haz- See Appliance Chart,Table 1. ards, such as upright broilers, which cannot be protected with • For appliance hazard surfaces that exceed the Ifstect protec- averlapping nozzles and therefore must be proiected with nozzles tlon sizes, multiple zones must be utilized.Align entire hazard dedicated to the appliance. surface area within the multiple zones. • All hood,duct,and individual appliance prokection are as speci- fied in the R-102 Design, InstaAation, Recharge and Mainten- ance Manual,Part No.418087. • All appllance protection currentiy listed in the R-102 Design Manual,Part No.418087,is also approved protection.Zone pro- tection can be consldered optional protection.