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Chapter 4 — System Installation <br /> Page 4 -10 <br /> REV. 3 <br /> NOTE GAS SHUT-OFF VALVE <br /> INSTALLATION <br /> Crimps must always be used in conjunction with two <br /> (2) cable lengths. Loops are the accepted method of <br /> connecting the cable to mechanical components. The 1. Mechanical Gas Shut -Off Valve <br /> crimp must never be used on a single cable. Installation. <br /> Exception: Single cable crimp allowed in detection <br /> and gas valve ratchet wheel using stop sleeve, Part The Model MCH3 /NMCH3 Control Head is used to operate <br /> No. 26317 (packages of 10: Part No. 24919). the mechanical gas shut -off valve. This valve is located in <br /> the fuel gas supply line. The valve body has an arrow which <br /> Cut and thread the cable through the hole in the latching indicates direction of gas flow through the valve. The gas <br /> arm of the control head and pull the cable tight. Crimp the shut -off valve is spring loaded and requires five pounds of <br /> • cable 6 in. (15.2 cm) below the latching arm. force to hold it open. This force is supplied by a 1/16 in. <br /> Pull the pull handle until the crimp touches the latching arm. diameter stainless steel cable that is connected to the con - <br /> Coil the excess cable in the pull box and attach the cover trot head. After the valve is installed in the gas line, 1/2 in. <br /> plate with the four screws provided. Insert the pull handle conduit must be run from the top center knockout of the gas <br /> into the cover plate and insert the pull pin through the bush- valve box to the lower right-hand knockout in the control <br /> ing and the pull handle. Secure the pull pin with the nylon head. A PYRO-CHEM corner pulley is used wherever a <br /> tie provided. See Figure 4 -17. change in conduit direction is required. <br /> Gas Valve Cable Run Limitations When Used With <br /> 2. Model RPS -E2. Model NMCH3 or MCH3 Control Heads and <br /> Part No. 415670 and 423250 Pulley Elbows <br /> The Model RPS -E2 remote electrical pull station is used for Maximum length of cable: 100 ft. (30.5 m) <br /> remote actuation of the Model ECH3 Control Head. It is to <br /> be located near an exit in the path of egress from the haz- Maximum # of pulleys: 30 <br /> and area no more than 4 ft. (1.2 m) above the floor. The <br /> Model RPS -E2 is installed in the detection /actuation circuit <br /> and wired in accordance with the instructions included. See <br /> Figure 4 -14.1 for typical circuit wiring. <br /> HINS <br /> PULI_STATIGN P N <br /> PULL STATION IUl <br /> 1.1 CONNECTION CONNECTION <br /> las <br /> al <br /> - <br /> 1 ECH3 — � <br /> �'�� �1 �� CONTROL <br /> � HEAD ' .,, <br /> 1 `' M� � ! I� <br /> MCH3 1 ��r PULL PECL <br /> ;TArION 11 <br /> CONTROL TFR?� "JNAT'.6fd <br /> HEAD <br /> REMOTE <br /> PULL PUL STATION <br /> TERMINATION <br /> Figure 4 -17. Model RPS -M Remote Pull Station Termination. <br /> 002885PC/003647PC <br /> 1/2 N. EMT CONNECTOR <br /> ,:' CONTROL BOX <br /> i <br /> VALVE BODY <br /> JNON <br /> UNION <br /> ;A <br /> 115111i 111: 1s <br /> Figure 4 -18. Gas Valve Installation. <br /> 002886PC <br /> ULEX 3437 CEx732 <br /> September 1, 2006 <br />