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R-102 Restaurant Fire Suppression Manual SECTION 4–SYSTEM DESIGN ' UL EX3470 ULC EX3470 2014-SEP-01 REV. 11 PAGE 4-71 • DETECTION SYSTEM REQUIREMENTS - • - Once the fire suppression system design has been determined, a detection system design must be completed. This section ► contains guidelines and limitations for detection system instal- I Ir lation. 1 "a—.--4r--m,. ,——' Detector Identification The two types of detectors are distinguished from each other by 1111 their location in the detection system. 20 Fr�s.o m) MAXIMUM ► 1.The Terminal Detector is the last in a series of detectors, or the only detector used in a single-detector system.This detector is thus named because it is at the point at which the wire rope ends, or"terminates." ► 2.A Series Detector is any detector located in-line between the I #. .- . regulated release mechanism and the terminal detector. . Detector/Pulley Elbow/Conduit Offset Design Limitations • FIGURE 4-139 1.Conduit runs, pulley elbows, and number of detectors per 000271 system must be within the approved system guidelines.The following requirements must not be exceeded: NOTICE Maximum Maximum Maximum When gas appliances are used and the flue Number of Number of Length of gases from the burner are exhausted into the Detectors Elbows 1/2 in. Conduit duct, the detector must be kept out of the air • per System per System per System stream of these exhaust gases.These gases fir, Scissors Style 15 20 150 ft(45.7 m) can be very hot and could actuate the system Detector unnecessarily. (Without Duct openings that are long and narrow or Offset Conduit large enough to require multiple duct nozzles Scissors Style 15 16 150 ft(45.7 m) may require additional detectors. Detector(With Offset Conduit ELECTROSTATIC PRECIPITATOR 2.If the hazard requires more than 15 detectors, up to five If an electrostatic precipitator is located at or near the base of 101 Remote Releases (Part No. 433485) can be used for the exhaust duct, it is necessary to locate a detector below the system actuation. Each 101 remote release allows the use precipitator, at the base of the duct, and also locate one in the of a maximum of 15"scissor"style detectors(14 series and duct,just above the precipitator.See Figure 4-140. 1 terminal)for a total of 75 detectors if needed. When installing the detector bracket and system conduit, make Detector Placement Requirements certain they do not interfere with the operation of the precipitator. EXHAUST DUCTS Note: On secondary filtration units utilizing multiple filter stages/ Each exhaust duct must have at least one detector installed ,media, contact Technical Services for instructions. in the duct entrance, located in the airstream of the cooking vapors,or at a maximum of 20 ft(6.0 m) into the duct opening. See Figure 4-139 MI c.,,,.) . —r-------------------Hemiiii.... /'''----- /O.: FIGURE 4-140 000268