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DISTRIBUTION PIPING REQUIREMENTS (Continued) Distribution Piping Requirements - 1.5 Gallon System ~ DUCT, PLENUM, AND APPLIANCE PROTECTION 1. This option allows for duct protection, plenum protection, appliance protection, or any combination. .. 2. When using a combination of plenum and duct protection only, only one duct nozzle, either a 1W, 1100, or a 2W, may be used. 3. All distribution piping, supply and branch, must be 3/8 in. Schedule 40 black iron, chrome-plated, or stainless steel. 4. Each 1.5 gallon tank allows a maximum of five flow numbers. * 5. The pipe leng1h between the start of the first branch line and the start of the last branch line nwst not exceed 8 ft. (2.4 m). When the supply line is split, th~ combined length of both legs of the supply line (start of first branch line to start of last branch line) must not exceed 8 ft. (2.4 m). See Rgure 82. 6. The combined leng1h of all branch lines must not exceed 22 ft. (6.7 m). See Figure 83. 7. The requirements of the following table must not be exceeded: .. .. .. Requirements Pipe Size Maximum Length ~ 3/8 in. 40 ft. (12.2 m) 6 ft. (1.8 m) Duct Branch Line 3/8 in. 6 ft. (1.8 m) 4 ft. (1.2 m) Maximum Rise Maximum 900 Elbow 9 4 Maximum Tees Maximum Flow Numbers 5* 2 SECTION IV - SYSTEM DESIGN UL EX. 3470 ULC CEx747 Page 4-45 10-1-02 REV. 1 START OF LAST BRANCH LINE START OF FIRST \ BRANCH LINE ! ~ FIGURE 82 llOO784 1W NOZZLE (BRANCH LINES IN BOLD) COMBINED LENGTH MUST NOT EXCEED 22 FT. (6.7 m) ~ FIGURE 83 000785 Plenum Branch Line 3/8 in. 4 ft. (1.2 m) 2 ft. (.6 m) Appliance Branch Line 3/8 in. 10 ft. (3 m) 2 ft. (.6 m) 4 6 2 3 2 3 o Exception.: 1. Six (6) flow numbers are allowed when a duct branch line Is the lest branch line on the piping network and no 1N nozzles, Part No. 56930, ere used to protect woks or griddles. 2. Six (6) flow numbers are allowed when six (6) 1N nozzles. Part No. 56930, are used and none of the nozzlea are used to protect woks end griddles. NOTE: Only five (5) flow numbers are allowed if a 1N nozzle is used for wok or griddle protection. .. 3. Six (6) flow numbers are allowed when only two (2) 3N nozzles. Part No. 76782, are used.