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SECTIONS IV - SYSTEM DESIGN ■Ul.EX3470 ULC EX3470 Page 4-46 REV.6 7-1-U9 OVERLAPPING NO2ZLE COVERAGE{Continued) 4. On protected appliances, all hazard surfaces locaked in a Overlapping Qppliance Nozzle and Hazard 2one locations- 9roup must be within 40-45 in.(1-1.1 m)from the nozzle(s). Group Protectian(Continued) Once that dimension is exceeded,a new group must be start- ► ed.See Figure 99. 2. When obstructions are located adjacent to app6ance(s) pro- tected by over3apping nozzles,the overfapping appliance noz- Note:The supply pipe feeding nozzle groups is to be at ihe zle spacing must start with the appliance(s) adjacent to the same elevation.Adjust height for each graup oniy by varying . obstruction.See Figure 97. IengEhs of nozzle drops. 25.5 IN 25.5 IN. 25.5 IN. 25.5 IN. � 11.5 SN.(28.2 em) ► 71.5 IN. (gq.8 cm) (84.8 cm) (64.8 cm) (64.8 cm)I MAXIMUM ► (292 cm) _� 11.5 IN. MAX. + MAX. + MAX. MAX. + MAX ,� (2g2 cm) � 245 26D 280 280 245 M�� 1 i I` � END OF � � I f � I/�ZONE ! NOZZLES f OUTSIDE � � � NOZZLES � EDGE OF � I ao iN. i � COOKING 45IN. � ��.0 m) � Hn7AR� (>>m� END OF � aD ItJ. � ZON£ ^-� (1.0 m) 45 ItJ. I ' � 1 � (1.1 m) t r I� � �---HAZARD AREA-�----►I O6S7RUCTION NOTE;On continuous appliance protactbn,slart and end with 245 nozzles and 260 nozzle(5)in lhe midale. � FIGURE 97 �--GHOUP'A'--►�+-GROUP`B'---r� 001)53 N07E:On group appGance proteclion,stazt antl end of EACH zone 3. When an appliance requires dedicated protection with a pro- y,o�P mus�ne P�oc�ciea wun a zas�ouie. tected area intended for overlapping appliance nozzie protec- , tion,the group protection opEion will be required for appliances FIGURE 99 �� on either side of the appliances using dedicated protection. Group protection using overlapping appliance nozzies must petectton Requirements For Overtapping Appllance begin with the protected appliance(s)adjacent to the dedtcat- protection ed appllance protected. An overlapping appliance nozzle(s) y�hen utillzing overlapping appliance protection,fusible link detec- ► must be positioned within 11.5 in.(29.2 cm)of the edge(s)of tors must be installed on a maximum of 2 fl (O.6i m) centers, the appliance hazard surface area(s)adJacent to the dedicat- starting wilh detectors locafed in(under}the duct opening(s). ► ed nozzle protection.See Figure 98. Starting from the detector under the duct opening,add detectors on 2 it(0.61 m)maxlmum spacing until the complete length of the plenum area is covered,from one enc!to the other.The bcation of the last detector on each end of the plenum must not exceed EDGE OF COOKtNG 2 ft(0.61 m)irom end of plenum. HAZARD � Note: Standard detector placement can also be utitized when i zs.s�w.i y using overlapping proiection. However, Ehe overlapping detector 11.5 IN. r 25_5 IN. 25.5 IN.t o tion cannot be used when utilfzEn standard R-102 rotection. ► (292 cm)-► (64.6 cm) (64.8 cm)(fi4.8 an) i 1.5 IN. P 9 P MAX. MAX. � � MAX MAX. 1282 cm) ►Refer to Pages 4-57 and 4-58 for detector placement. MAX. � HDGE� 11.51N. 1S.5IN.(292 cm) EDGE OOOKING {292 cm�MAX. MAXtMUM OF CAOKING HAZARD HAZARD QEDICATE�NOZZLE APPLIANCE NOTE:On group appliance pro�ection,slan and end of EACH zone � group m�st be protected wiih a 2as nozzle. FIGURE 98 ooi�sc