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• Chapter 4 — System Installation Page 4 -5 REV. 2 FUSIBLE LINK DETECTOR Fusible Link Line Limitations When Used With INSTALLATION Model MCH3 and NMCH3 Control Heads and Part No. 415670 and 423250 Pulley Elbows Fusible links are always used in conjunction with the Model Maximum # of Detectors: 20 MCH3 /NMCH3 Mechanical Control Head. After mounting • Maximum length of cable: 150 ft. (45.7 m) the cylinder and control head, the fusible link line can be Maximum # of pulleys: 40 installed. The first step to installing the fusible link line is to install the detector bracket(s). These brackets must be ► installed in the plenum area, hazard area, and in each duct. 1. Fusible Link Installation Without Hangers. See Chapter III for detector placement guidelines. Begin installing links at the terminal bracket. The link is con- nected to the far side of the terminal bracket using an "S" hook. Note: Only ML -style Fusible Links can be used. The "S" hook must be crimped closed after the link is installed. A tight loop is then made in the cable and secured by the • Connect the fusible link brackets together using 1/2 in. con- crimp provided. This loop is connected to the other side of the duit and - the conduit connectors supplied in the detector kit terminal link (see Figure 4 -6) and the cable fed through the (Model FLK- 1/1A). A PYRO -CHEM corner pulley must be conduit to the next bracket. The cable proceeding from the ter - used whenever a change in conduit direction is necessary. minal link will be used to connect the series links (see Figure The conduit is connected to the control head through a 4 -7). Series links must be centered in their detector brackets. knockout in the upper left -side corner. In general, fusible links centered in the detector brackets ► are connected in series using 1/16 in. diameter stainless steel cable. The spring plate in the control head maintains tension on this series of fusible links. If the tension is released for any reason (i.e., a fusible link separates), the control head will operate and actuate the system. Maximum limitations for the fusible link detection line are as follows: Fusible links can be installed with or without fusible link hangers (see Chapter II for description). LINK DETECTOR BRACKET TERMINAL LINK S -NOOK Figure 4 -6. Terminal Link Installation. 002849aPC 1 LIN EMT C01:NC::T■F ► ' ti IN S "AINLES0 Si EELCABLE r FCSIB.E UNK SERIES LINK CARL .E CRIMP Figure 4 -7. Series Link Installation. 002849bPC ULEX 3437 CEx732 March 17, 2004