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Chapter 4 — System Installation Page 4 -7 REV. 2 The fusible link line can now be put into a set position by LATCHING ARM applying tension to the fusible link line. This is accomplished PULL PIN • by using a 1/2 in. hex wrench on the fusible link line ratchet wheel. The ratchet wheel will be ratcheted in a clockwise direction until the spring plate makes contact with the top of .:Iiimr;»'. the control head box. The fusible link line is now in a set position. See Figure 4 -8. Check to ensure that the fusible link hanger(s) remain centered in the bracket after the fusible link line is set. See Figure 4 -12. SLIDE CAM ARM F USISL LINK KI 1 (SOLDSEPAHAI EC G) Figure 4 -13. Control Head In Set Position. 2. Model ECH3 Electrical Control Head. Male Once the thermal detectors have been installed, the control ' ':1 head can be placed in the set position. To set the control FU_IB , INK head, the slide plate is moved from right to left, ensuring Lµ tl- /-I S oLDS EPARAILL, the bolt extending from the cam arm is in the slot provided FUSIBLE LINK - - , I in the slide plate. Continue moving the slide plate to the left HANGER until the latching arm is in the locked position. Insert the pull Figure 4 -12. Fusible Link /Hanger In Set Position. pin into the hole in the slide plate above the latching arm. 002850PC This will lock the control head in the set position, eliminating accidental actuation during the rest of the installation THERMAL DETECTOR procedure. INSTALLATION Once the Model ECH3 Electrical Control Head is in the set position, it can be connected to the detection /actuation Thermal detectors are always used in conjunction with the circuit. Model ECH3 Electrical Control Head. After mounting the cylinder and control head, the thermal detector(s) can be NOTE installed. See Chapter III for detector placement guidelines. No electrical connections shall be made inside the Follow the instructions included with the detector for proper control head. All electrical wiring shall exit the control detector mounting procedures. head through the knock -out on the side of the box. All electrical connections must be made in an approved SETTING THE CONTROL HEAD electrical box. ► Model MCH3 /NMCH3 Mechanical Connect one of the black wires on the solenoid in the con - Control Head. ► trol head to the red wire of the Model MS -SPDT Micro • Switch. The brown wire from the micro switch is then con - Once the fusible link line is set, the control head can be nected to one side of the first thermal detector in series. placed in the set position. To set the control head, the slide Connect the other side of the first thermal detector in series plate is moved from right to left, ensuring the bolt extending and the remaining black wire on the solenoid in the control from the cam arm is in the slot provided in the slide plate. head to the appropriate power source after installing the Continue moving the slide plate to the left until the latching Model SM- 24/120 Solenoid Monitor. arm is in the locked position. Insert the pull pin into the hole in the slide plate above the latching arm. This will lock the CAUTION control head in the set position, eliminating accidental actu- The solenoid must never be wired "hot" (not through ation during the rest of the installation procedure. See the micro - switch). If wired this way, the non -field Figure 4 -13. replaceable solenoid will be damaged and the com- plete control head will require replacement. ULEX 3437 CEx732 March 17, 2004