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SECTION III—SYSTEM COMPONENTS <br /> • UL EX. 5174 6-5-98 Page 3-7 <br /> REV 1 <br /> MANUAL RESET RELAY PRESSURE SWITCHES <br /> The manual reset relay, Part No 14702, is required when using an The pressure switch, Part No. 53133 (SPDT) and Part No. 24377 <br /> electrical gas valve shut-off system. After the electric gas valve (DPDT), is a pneumatically operated electrical switch intended for <br /> has closed, either due to system actuation or power failure, the use with electric gas valves, alarms, contactors, lights, contractor <br /> vaive can not be re-opened, allowing gas to flow, until the reset supp�ied electric power shut-off devices, and other electrical <br /> relay button is manually pressed, re-energizing the circuit. The devices that are designed to shut off or turn on when the fire sup- <br /> reset relay is available 120 VAC. The manual reset relay is also pression system is actuated. The switches are rated at 20 amp, <br /> recommended for electrical shut down. 125,250,or 480 VAC—with 10 amp at 125 VAC"L"1 hp-115 VAC, <br /> 2 hp-230 VAC, 1/2 amp at 125 VDC, 1/4 amp at 250 VDC,and are <br /> available in SPDT or DPDT models. The switch enclosure con- <br /> tains an external reset button for convenient resetting. <br /> � <br /> � <br /> m <br /> a � <br /> I FS�r � <br /> FIGURE 23 <br /> 0000e� <br /> ELECTRICAL SWITCHES FIGURE 25 <br /> 000168 <br /> ►The electrical switches are intended for use with electric gas <br /> valves, alarms, contactors, lights, contractor supplied electric BURSTING DISC <br /> power shut-off devices and other electrical devices that are The Bursting Disc is installed in the tank adaptor assembly. The <br /> designed to shut off or turn on when the system is actuated. bursting disc eliminates the siphoning of the agent up the pipe dur- <br /> Switches are available in kits: One Switch Kit, Part No. 423878, ing extreme temperature variations. The bursting discs are avail- <br /> Two Switch Kit, Part No 423879, Three Switch Kit, Part No. able in packs of 10, Part No 426666. <br /> 423880, and Four Switch Kit, Part No 423881 Each switch has a <br /> set of single-pole, double-throw contacts rated at 21 amp, 1 HP, <br /> 125, 250, 277 VAC or 2 HP, 250, 277 VAC Mounting hardware is <br /> provided with each kit, / /� <br /> / <br /> COMMON -► � N.0 <br /> FIGURE 26 <br /> 000,�z <br /> � � REGULATOR TEST KIT <br /> � The Test Kit Assembl Shi in Part No 56972 is re uired to <br /> N.o. Y � PP� 9 ) � q <br /> test the regulator setting and nitrogen flow during 12-year mainte- <br /> nance examinations. This will ensure that the regulator is func- <br /> tioning property. <br /> . <br /> FIGURE 24 <br /> oms,z <br /> FIGURE 27 <br /> Q00,69 <br />