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Chapter 4 – System Installation <br /> Page 4 -12 <br /> REV. 3 <br /> R ING <br /> PIN END -OF -LINE RESISTOR <br /> PULL STATION r ! <br /> CONNECTION 1e. i FIRE ALARM <br /> OR NEXT DEVICE <br /> � CONTROL PANEL <br /> r ALARM REMOTE CIRCUIT <br /> PULL STATION <br /> TERMINATION '� •'•'Di' <br /> ALARM INITIATING <br /> • SWITCH <br /> Figure 4 -22. Micro Switch Installation in Model ECH3 <br /> Control Head. <br /> 003647PC / <br /> rti <br /> __. <br /> NOTE — <br /> The Model ECH3 Control Head is supplied with a Model • <br /> MS -DPDT Micro Switch. This switch can be used in the <br /> actuation /detection circuit and for electrical output. <br /> These switches may be used to provide an electrical signal r <br /> to the main breaker and /or operate electrical accessories IN OU OUT <br /> provided the rating of the switch is not exceeded. Wiring CORRECT- SEPARATE INCOMING AND OUTGOING CONDUCTORS <br /> connections are shown in Figure 4 -23. The contact ratings Figure 4 -24. Wiring Diagram for Alarm Initiating Switch. <br /> for the switches are as follows: 004891/004905 <br /> Contact Ratings For Micro Switches PIPE AND NOZZLE INSTALLATION <br /> 21 amps, 1 HP, 125, 250, 277 VAC <br /> or 2 HP, 250, 277 VAC General Piping Requirements <br /> 1. Use Schedule 40 black iron (if used in a relatively non- <br /> corrosive atmosphere), galvanized, chrome - plated, or <br /> BLACK 1 stainless steel pipe conforming to ASTM Al20, A53, or <br /> A106. Fittings must be a minimum of 150 Ib. Class. <br /> However, the PCI 35, 50, and 70 Ib. cylinders must have <br /> RED a minimum of two (2) nozzles per cylinder to utilize the <br /> 150 Ib. Class fittings. If the PCI 35, 50, or 70 Ib. cylinder <br /> has one (1) nozzle, then a 300 Ib. Class fitting must be <br /> BROWN used. The remaining Monarch cylinders have no limita- <br /> Figure 4 -23. Wiring Diagram For tions for the 150 Ib. Class fittings. Distribution pipe sizes <br /> Model MS -SPDT Micro Switch. are 3/4 in. or 1 in. depending on number of nozzles. <br /> 002903PC <br /> 2. Pipe unions are acceptable. <br /> The Alarm Initiating Switch, Part No. 550077, must be used 3. Use reducing tees for all pipe splits. <br /> ■ to close a supervised alarm circuit to the building main fire <br /> alarm panel when the control head actuates. This will signal 4. Reducing bushings are not acceptable. <br /> the fire alarm panel that there was a system actuation in the 5. Cast iron pipe and fittings are not acceptable. <br /> hazard area. This switch can be field installed in the control <br /> head. Refer to Instruction Sheet, Part No. 550081, included 6. Pipe thread sealant or pipe joint compound is not <br /> with the switch shipping assembly, for detailed mounting allowed for distribution piping. <br /> instructions. Wiring connections are shown in Figure 4 - 24. 7. Bell Reducer or any non - restrictive fittings are allowed. <br /> The switch is rated at 50mA, 28VDC. <br /> 8. Before assembling the pipe and fittings, make certain all <br /> ends are carefully reamed and blown clear of chips and <br /> scale. Inside of pipe and fittings must be free of oil and <br /> dirt. <br /> ULEX 3437 CEx732 <br /> September 1, 2006 <br />