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Chapter 4 — System Installation Page 4 -14 REV. 2 • MAIN /RESERVE SYSTEM When a reserve system is being utilized, two 1 in. swing check valves, Part No. 417788, must be installed in the dis- tribution piping network. They should be positioned as close ■ as possible to the "Y" fitting joining the piping from the main and reserve tanks to one common supply pipe. See Figure 4 -28. Note: Make certain to install swing check valves in the direction of dry chemical flow as shown with an arrow stamped on the valve body. • „ IN. (30.5 cm) SWING CHECK VALVE MAXIMUM 12 TO 15 IN. MAIN SYSTEM (30.5 to 38.1 cm) SUPPLY PIPE FROM TANK VALVE � ( $ s 4 5° r � _- BRANCH RESERVE ` DISTRIBUTION SYSTEM SUPPLY PIPE FROM TANK PIPING TO VALVE � NOZZLE(S) 111.1111111.00) ► Figure 4 -29. Pressure Switch Installation. 003025PC Figure 4 -28. Main/Reserve System. SYSTEM CHECKOUT AFTER INSTALLATION PRESSURE SWITCH INSTALLATION 1. Model MCH3 /NMCH3 Mechanical Control The Model PS- SPDT -X Pressure Switch is available for use Head. when an electrical output is required. It must be installed in ►the discharge piping within 12 in. (30.5 cm) of the valve dis- Before putting the system into service, all components must • charge port as shown in Figure 4 -29. An inline tee is used for the installation. The switch is isolated from the chemical be checked for proper operation. During this checkout, • by a 12 in. to 15 in. (30.5 to 38.1 cm) column of air in the assure that the carbon dioxide pilot cartridge is not installed form of a vertical pipe nipple. The switch is then mounted at in the control head actuator. Remove the pull pin from the the top of this nipple. hole in the slide plate. To check satisfactory operation of the control head, cut the NOTE terminal link or the "S" hook holding the link. This will relieve Piping for pressure switch must be included in total all tension on the fusible link line and operate the control cylinder to T1 piping limitations. The fitting used to • head. The slide plate will move fully to the right. The gas connect the pressure switch to the distribution piping • valve cable will be released, causing the gas valve to close. counts as one (1) elbow in that section. Any auxiliary equipment connected to the dry contacts of • the solenoid monitor and /or the Micro Switch in the control ► head will operate. As an alternate, the switch may be connected directly to the copper tubing of a remotely mounted control head or a PAC If any of these events fail to occur, the problem must be cylinder. The PS- SPDT -X counts as one cylinder in this sec- investigated and repaired. tion, and the limitations on copper tubing and /or pipe previ- ously stated in this manual apply. Repair the terminal link and put the fusible link line back • into the set position. This is accomplished by using a 1/2 in. • hex wrench on the fusible link line ratchet wheel. The ratch- et wheel will be ratcheted in a clockwise direction until the spring plate makes contact with the top of the control head box. Once the fusible link line is set, the control head can be placed in the set position. To set the control head, the slide plate is moved from right to left, ensuring the bolt extending ULEX 3437 CEx732 March 17, 2004