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<br />It <br /> <br />. <br /> <br />. <br /> <br />SECTION 5 <br /> <br />MODIFIED PIPING <br /> <br />To supplement the basic surface appliance pro- <br />tection, described in Section 4, extra surface ap- <br />pliances may be protected by taking one branch <br />pipe from any duct or plenum tee. If a %-inch <br />restrictor (Part No. 256296) is inserted into the pip- <br />ing adjacent to the nozzle, an SW-2 nozzle can be <br />substituted for an SP-2 nozzle and used to protect <br />the extra appliance. If both a duct and a plenum <br />nozzle are available, both may be used to protect <br />appliances. <br /> <br />The piping size, and piping and elbow limitations <br />for these two cases is spelled out in the following <br />paragraphs. <br /> <br />Duct Piping for Appliance Protection <br /> <br />If an extra duct nozzle is available, it can be used <br />for appliance protection by rerouting the piping; <br />substituting an SW-2 nozzle for an SP-2 nozzle; <br />and adding a Vz-inch restrictor, Part No. 256296, in <br />the piping just before the nozzle. (See Figure 5-1). <br />NOTE: The SW-2 nozzle has a 1/2-inch male pipe <br />thread. The restrictor has 3/4-inch <br />female threads. Therefore, bushings <br />must be used to mate the nozzle and <br />restrictor. <br /> <br />Table 5-1 gives piP.e size, and piping and elbow <br />limitations for this nozzle substitution. <br /> <br /> <br />* SEE BELOW TABLE <br /> <br />DUCT MuST NOT <br />EXCEED 75 INCHES <br />IN PERIMETER <br />/,,", <br />'- <br /> <br />RESTRICTOR <br />PN 256296 <br /> <br />SW-2 NOZZLE <br /> <br /> <br />Figure 5-1. Spare duct nozzle for appliance pro- <br />tection. <br /> <br />* SEE BELOW TABLE <br /> <br />~~ <br />Q <br /> <br /> <br />RESTRICTOR <br />PN 256296 <br /> <br />SW- 2 NOZZLE <br /> <br />Figure 5-2. Spare plenum nozzle for appliance <br />protection. <br /> <br />TABLE 5-t <br /> <br />PIPING AND ELBOW LIMITATIONS <br />MODIFIED PIPING <br /> <br />Fig. 5-1 <br />REF. <br /> <br />DESCRIPTION <br /> <br />PIPE LENGTH <br />MAX. MIN. <br /> <br />PIPE DIAM. <br />INCHES <br /> <br />P <br /> <br />Duct tee, T 1 to SW-2 nozzle <br /> <br />10'6" <br /> <br />ELBOWS <br />MAX. MIN. <br /> <br />0" <br /> <br />4 <br /> <br />1 <br /> <br />1/2 <br /> <br />*Dimensions C (Figure 5-1) and F (Figure 5-2) refer to Table 4-1. <br /> <br />UL Ex 2153 <br />1 November 1981 <br /> <br />i r.N1PA BAY FIRE EQUIPMENT <br />P.O. Box 4823 <br />4I(-"MINOLE, FLORIDA 34642 <br />(813) 392-9200 <br /> <br />5, 1 <br />