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Chapter 5 — System Maintenance Page 5 -2 REV. 2 3. Piping and Nozzles. CAUTION ► Piping should be blown out with air or dry nitrogen. Nozzle Before screwing the carbon dioxide pilot cartridge blow off caps should be replaced. into the actuator, ensure that the actuator has an 0-ring installed. 4. System Reset. 8. Inspect the cylinder pressure. Tap the gauge lightly to All fusible links should be replaced. The fusible link line can ensure the needle is moving freely. If the gauge shows a now be put into a set position by applying tension to the loss in pressure indicated by the needle being below the ►fusible link line. This is accomplished by using a 1/2 in. hex green band, the tank should be removed and recharged • wrench on the fusible link line ratchet wheel. The ratchet per the SYSTEM CYLINDER RECHARGE section of wheel will be ratcheted in a clockwise direction until the • Chapter V (System Maintenance) in this manual. spring plate makes contact with the top of the control head box. The fusible Zink line is now in a set position. 2. Annual Maintenance. After setting the fusible link line, the system can be put back into service by following the SYSTEM CHECKOUT 1. Inspect as per six (6) month maintenance instructions. AFTER INSTALLATION Section of Chapter IV. 2. Disconnect and remove the discharge piping from the system. Using air or nitrogen, blow out the discharge REGULAR SYSTEM MAINTENANCE piping. Replace all nozzle caps. • 3. Fixed temperature sensing elements of the fusible alloy 1. Six (6) Month Maintenance. type shall be replaced at least annually or more fre- quently, if necessary, to assure proper operation of the 1. Check that the hazard has not changed. system. • 4. Test thermal detectors and remote pull station per SYS- 2. Check that all nylon ties are in place and the system TEM CHECKOUT AFTER INSTALLATION section located has not been tampered with. in Chapter IV System Installation) of this manual. Per NFPA 72, two (2) or more detectors per circuit should be 3. Check the entire system for mechanical damage. tested. Note individual detector location and date of test- ing. Within 5 years, all detectors in system must be tested. • 4. Check the solenoid monitor. 5. Replace the carbon dioxide pilot cartridge, recording the • 5. Disconnect the control head or pneumatic tubing from date of installation on the cartridge with a felt- tipped each agent cylinder. Remove the carbon dioxide pilot marker. cartridge and exercise the control head to ensure it is functioning properly. Make sure the gas shut -off valve CAUTION and the remote pull station are functioning properly. Before screwing the carbon dioxide pilot cartridge into the actuator, ensure that the actuator has an NOTE 0-ring installed. Before continuing, remove the cover from the control ► head and insert the pull pin in the hole in the slide 3. Six (6) Year Maintenance. plate above the latching arm. This will secure the system, preventing accidental discharge. 1. Inspect as per annual maintenance instructions. 2. Examine the dry chemical. If there is evidence of cak- • 6. Inspect fusible link detectors for excessive grease ing, the dry chemical shall be discarded. buildup. Clean or replace links if necessary. Visually inspect thermal detectors. 4. Hydrostatic Testing. NOTE The dry chemical agent cylinder(s) and pneumatic cylin- der(s) shall be hydrostatically tested at least every twelve Methods and frequency of inspection, testing and (12) years as per NFPA -17. maintenance of detectors should be in accordance with NFPA -72. NOTE • Refer to NFPA -17 for additional maintenance require- • 7. Reinstall the carbon dioxide pilot cartridge and replace ments. the control head cover and nylon tie. ULEX 3437 CEx732 March 17, 2004