OWNERS SERVICE MANUAL NO. 05614
Contents
1. hose tighten the coupling turn after contacting the hose gasket Coil the hose onto the extinguisher hose rack using the reverse loop procedure Install nozzle with the lever in the closed forward position into the nozzle mount Remove the safety vent plug from the nitrogen cylinder Re connect the high pressure hose securely to the nitrogen cylinder valve Wipe the extinguisher clean Record service data on the inspection tag according to NFPA 10 requirements and attach to extinguisher Return extinguisher to its proper location RECHARGE RECHARGING NFPA 10 4 2 3 is the replacement of the extinguishing agent and also includes the expellant for this type of extinguisher RECHARGE PROCEDURE WARNING BEFORE ATTEMPTING TO RECHARGE BE SURE THIS EXTINGUISHER IS COMPLETELY DEPRESSURIZED THERE IS A CHECK VALVE IN THE SYSTEM WHICH PREVENTS NITROGEN PRESSURE FROM ESCAPING FROM THE AGENT CYLINDER WHEN THE NITROGEN HOSE IS DISCONNECTED THE AGENT CYLINDER MAY BE PRESSURIZED EVEN THOUGH NO PRESSURE ESCAPES FROM THE CYLINDER NITROGEN CONNECTION Note Proper procedure for recharging any dry chemical extinguisher includes the use of a closed recovery system NFPA 10 4 5 3 4 The Getz Model SV1 400 VACU FILL SYSTEM is ideal for this application it provides for the recovery of the remaining agent by direct discharge into the system trapping the fines while allowing the nitrogen to escape and provides a more accurate fill of the e2. OWNERS SERVICE MANUAL NO 05614 INSTALLATION OPERATING AND SERVICING INSTRUCTIONS for 300 350 POUND NITROGEN CYLINDER OPERATED DRY CHEMICAL FIRE EXTINGUISHERS 55 CU FT NITROGEN CYLINDER WHEELED STATIONARY Model 491 ABC 36 Wheels Model 464 ABC Model 492 REGULAR 36 Wheels Model 465 REGULAR Model 493 PURPLE K 36 Wheels Model 466 PURPLE K xkk RECHARGE FIRE EXTINGUISHERS IMMEDIATELY AFTER ANY USE All fire extinguishers should be installed inspected and maintained in accordance with the National Fire Protection Association standard titled Portable Fire Extinguishers NFPA 10 and the requirements of local authorities having jurisdiction When maintenance is indicated it should be performed by trained persons having proper equipment Fire extinguishers are pressure vessels and must be treated with respect and handled with care They are mechanical devices and require periodic maintenance to be sure that they are ready to operate properly and safely Amerex strongly recommends that the maintenance of hand portable and wheeled fire extinguishers be done by atrained professional your local authorized Amerex Distributor Amerex Corp makes original factory parts available to insure proper maintenance use of substitute parts releases Amerex of its warranty obligations Amerex parts have machined surfaces and threads which are manufactured to exacting tolerances O rings hoses nozzles horns and all metal parts meet
3. 5 Open discharge nozzle to vent all residual chemical and nitrogen gas pressure 6 Re open nitrogen valve if additional pressure is required 7 When recharging this unit reset agent cylinder and vent valves install ring pins and lockwire seals CAUTION VALVE SHUT OFF HANDLES MUST BE INTHE POSITIONS SHONN ABOVE WHEN EXTINGUISHER IS ON STANDBY OR IN ACTUAL OPERATION lt 3 gt INSPECTING THE EXTINGUISHER INSPECTION NFPA 10 4 2 1 is a quick check that an extinguisher is available and will operate It is intended to give reasonable assurance that the extinguisher is fully charged and operable This is done by seeing that it is in its designated place that it has not been actuated or tampered with and that there is no obvious physical damage or condition to prevent operation PERIODIC INSPECTION PROCEDURES Monthly or more often if circumstances dictate NFPA 10 4 3 2 A quick check should be made of the extinguisher for the following Located in designated place No obstructions to access or visibility Operating instructions on nameplate and facing outward Seals and tamper indicators not broken or missing Determine fullness by weighing full weight is noted on the nameplate labell Examine for obvious physical damage corrosion leakage or clogged nozzle Pressure gauge Nitrogen Cylinder reading in the operable area NOOR WON MAINTENANCE MA
4. precise specifications and are subjected to multiple in house inspections and tests for acceptability There are substitute parts available which are incorrectly labeled as U L component parts some are advertised as Amerex type None of these meet U L requirements and all of them void the Amerex extinguisher warranty and U L listing DO NOT SUBSTITUTE REFERENCES IN THIS MANUAL AVAILABLE FROM NFPA 10 PORTABLE FIRE EXTINGUISHERS National Fire Protection Assoc Inc Batterymarch Park Quincy MA 02269 METHODS FOR HYDROSTATIC Compressed Gas Association Inc TESTING OF COMPRESSED GAS CYLINDERS 1235 Jefferson Davis Highway Suite 501 STANDARD FOR VISUAL INSPECTION OF Arlington VA 22202 COMPRESSED GAS CYLINDERS AMEREX CORP P O BOX 81 TRUSSVILLE ALABAMA 35173 0081 PHONE 205 655 3271 FAX 205 655 5112 E MAIL sales amerex fire com INTERNET HOME PAGE http Wwww amerex fire com Printed in U S A MM05614RevC 1 98T AMEREX CORPORATION DOES NOT SERVICE MAINTAIN OR RECHARGE FIRE EXTINGUISHERS THIS MANUAL IS PUBLISHED AS A GUIDE TO ASSIST QUALIFIED SERVICE PERSONNEL IN THE INSPECTION MAINTENANCE AND RECHARGE OF AMEREX FIRE EXTINGUISHERS ONLY NO INSTRUCTION MANUAL CAN ANTICIPATE ALL POSSIBLE MALFUNCTIONS THAT MAY BE ENCOUNTERED IN THE SERVICE OF FIRE EXTINGUISHERS DUE TO THE POSSIBILITY THAT PRIOR SERVICE PERFORMED ON THIS EQUIP MENT MAY HAVE BEEN IMPROPERLY DONE IT IS EXTREMELY IMPORTANT THAT ALL WARNINGS CAUTION
5. agent cylinder Check the couplings hose and hose gaskets for damage or deterioration replace as necessary 8 To perform an operational integrity check on the discharge hose and nozzle combination a Connect the test kit hose adapter to the female end of the discharge hose b Close the discharge nozzle shut off lever and properly secure it c Connect a properly regulated and verified nitrogen pressure source set to the extinguisher operating pressure 235 245 psi to the test kit hose adapter d Slowly pressurize the discharge hose nozzle assembly to the extinguisher operating pressure and check for leaks or distortion e Operate the nozzle lever to ensure proper operation and to clear the hose of any obstructions if hose is obstructed refer to TROUBLE SHOOTING section of this manual f Close the nitrogen pressure source and slowly relieve remaining pressure by fully opening the nozzle lever 9 Remove the agent cylinder fill cap and examine it closely for any signs of damage cracks or thread wear Clean the agent cylinder fill cap threads and thread vent port on the cap with a stiff bristle nylon brush Remove the fill cap gasket and check for wear cracks or tears replace if necessary Lightly lubricate the gasket with Visilox and re install 10 Examine the dry chemical agent for proper type and condition Replace chemical that is contaminated caked or other than the type indicated on the nameplate label Do not trust th
6. valve seat Replace with a properly charged nitro gen cylinder Clean and lubricate Agent cylinder may be pressurized Make no further attempt to remove the cap until this is checked See the RECHARGE PROCEDURE for proper depressurization method Replace hose assembly with Amerex P N 7292 Inspect safety outlet for tightness or damage Tighten if necessary Only tighten the large hex nut of the assembly The small round nut containing the holes is factory set to specific torgue value Do not attempt to adjust If damaged leaking or ruptured replace complete Amerex P N 3787 Safety Disc Assembly 300 350 LB WHEELED STATIONARY DRY CHEMICAL Extinguishers 55 CU FT Nitrogen Cylinder PARTS LIST Men NGS for 6993 DESCRIPTION Cap Forged Brass Agent Cylinder Cap Forged Brass Agent Cylinder with Pressure Indicator Gasket Cap Safety Disc Ass y 491 492 493 Safety Disc Ass y 464 465 466 7C B 7E WHEELED MODELS Nitrogen Hose Ass y 491 300 LB ABC 1387 Lock Wire Seal Yellow for T Handle Valve 492 350 LB REGULAR 4195 Lead Wire Seal for Nitrogen Valve 493 300 LB PURPLE K 2233 Nitrogen Valve Handwheel with Gauge STATIONARY MODELS 12467 Nitrogen Valve T Handle with Gauge 464 300 LB ABC 6373 pas T Handle with Roll Pin and nobs 4 nee 350 LB REGULAR 10213 Gauge 3000 PSI 66 300 LB PURPLE K 989
7. 7 Valve Stem Ass y 7 12466 Spring 8 6809 Nitrogen Cylinder 55 cu ft charged Including Valve Gauge and Protective Cap 11021 Retaining Strap Nitrogen Cylinder 9 11970 Bolt Washer and Wing Nut Nameplate Mylar Label Non U L SPECIFY MODEL NUMBER OF THE EXTINGUISHER 7B Pictogram 491 amp 464 492 493 465 466 7A Wheel Ass y 36 X 6 Red Wheel Ass y 36 X 6 with Rubber Tread Hub Cap Metal with Washer and Cotter Pin 7 D Moisture Seal Includes Disc amp Clear Vinyl Gasket 1 Connect hose coupling to outlet on the extinguisher Lay hose straight on ground to its full 50 ft length Start first regular loop counter clockwise by placing between side brackets and over the top bracket Gasket Hose Nozzle Ball Valve Ass y Nozzle Tip 491 492 464 465 531 493 466 469 Hose Ass y 1 x 50 Ft Nozzle Ass y Ball Valve amp Tip 491 492 464 465 493 466 Hydrotest Adapter Cylinder Fill Adapter Hose Hydrotest Adap Female 22 5723 Hose Hydrotest Adapter Male Plug K PART NOT PICTURED 2 The second loop is a REVERSE loop Notice that the hose passes behind the loop on this reverse loop If instructions are followed the hose will uncoil without kinks Guide to Proper Installation of Hose on Wheeled or Stationary Fire Extinguishers 3 The next loop is a regular hose in front loop
8. FETY PIN Pull T handle to OPEN CYLINDER VALVE This will pressurize the extinguisher Remove nozzle from the mount and with the nozzle lever in the CLOSED position PULL OUT HOSE from rack lt 2 gt 4 STAND BACK 30 FEET from the fire AIM NOZZLE AT BASE OF FLAMES nearest you Hold hose and nozzle firmly to allow for discharge recoil OPEN NOZZLE by pulling handle toward you SWEEP SIDE TO SIDE extending beyond the edges of the fire and progressively follow up and extinguish the fire CAUTION USE OF DRY CHEMICAL AGENT EXTINGUISHERS ON FIRES IN DELICATE ELECTRONIC EQUIPMENT IS NOT RECOMMENDED IT MAY SUCCESSFULLY EXTINGUISH THE FIRE BUT MAY DAMAGE THE EQUIPMENT BEYOND REPAIR Consult your Amerex Distributor for more details DISCHARGE TIME APPROXIMATE 60 to 70 SECONDS EFFECTIVE RANGE OF THE AGENT THROW 30 to 40 FEET HOSE LENGTH 50 FEET amp RECHARGE EXTINGUISHER IMMEDIATELY AFTER ANY USE SHUTDOWN lle After making sure that the fire has been completely extinguished close the nozzle valve and then close the T handle nitrogen valve Wheeled extinguisher Tip over until it rests on both wheels and handle in this position much of the remaining chemical will stay in the cylinder Stationary extinguisher See instructions below 2 Open the nozzle valve slowly to clear the hose of any remaining pressure and chemical be prepared for recoil and discharge of agent WARNING MAKE SURE THAT ALL PRES
9. INTENANCE NFPA 10 4 4 1 amp 4 4 2 At least once a year or more frequently if indicated by an inspection MAINTENANCE should be performed MAINTENANCE is a thorough check of the extinguisher It is intended to give maximum assurance that an extinguisher will operate effectively and safely It includes a thorough examination and any necessary repair or replacement It will normally reveal the need for hydro static testing Note The Getz Mfg P N 52576 Universal Wheeled Extinguisher Service Kit is available so that you can perform the maintenance functions now required by NFPA 10 ANNUAL MAINTENANCE PROCEDURES WARNING BEFORE SERVICING BE SURE THE EXTINGUISHER AGENT CYLINDERIS NOT PRESSURIZED Note This procedure will be best accomplished with the extinguisher in an upright position and on a level surface 1 Clean extinguisher to remove dirt grease or foreign material Check to make sure that the instruction nameplate is securely fastened and legible Inspect the cylinders for corrosion abrasion dents or weld damage If damage is found hydrostatically test in accordance with instructions in CGA Pamphlet C 1 and C 6 and NFPA Pamphlet 10 2 Inspect the extinguisher for damaged missing or substitute parts A careful inspection should be made of the safety relief to make sure that it has not ruptured corroded or been tampered with Only factory replace ment parts are approved for use on Amerex fire extinguishers 3 Check the da
10. S AND Notes IN THIS MANUAL BE CAREFULLY OBSERVED FAILURE TO HEED THESE INSTRUCTIONS COULD RESULT IN SERIOUS INJURY AMEREX ASSUMES NO LIABILITY FOR SERVICE MAINTENANCE OR RECHARGE OF FIRE EXTINGUISHERS BY PUBLISHING THIS MANUAL PREPARING YOUR NEW EXTINGUISHER FOR USE WARNING THIS FIRE EXTINGUISHER IS SHIPPED FROM THE FACTORY EMPTY AFTER INITIAL PREPARATIONS CAREFULLY FOLLOW THE RECHARGING INSTRUCTIONS BEFORE PLACING IT INTO SERVICE 1 Remove all wrappings straps and pallet retaining bolts 2 Examine the extinguisher for shipping damage Check to make sure that you have received the dry chemical charges which are shipped with the extinguisher ABC and PURPLE K 6 50 lb pails REGULAR 7 50 Ib pails 3 Fill the extinguisher by carefully following the RECHARGE instructions Page 6 4 Remove the nitrogen cylinder protective shipping cap Save the cap as it must be installed whenever a charged nitrogen cylinder is transported Remove temporary shipping ring pin and install large ring pin 5 Install new lockwire seal Check the nitrogen cylinder pressure The gauge should read approximately 2015 psig 13 9 mPa at 70 F 21 C ambient temperature See the Troubleshooting Guide for pressure temperature allowances 6 Remove and save the Safety Vent Plug installed on all T handle nitrogen valves Connect the nitrogen supply hose firmly to the nitrogen cylinder valve Make sure that there are no kinks in this h
11. SURE HAS ESCAPED BEFORE ANY FURTHER DISASSEMBLY 3 Stand unit upright after complete depressurization Note Nitrogen pressure in the agent cylinder cannot escape through a disconnected nitrogen hose assembly due to a check valve in the system Always be careful when removing the fill cap 4 Coil the extinguisher hose onto the storage rack and position the nozzle onto the mount in preparation for transport to the recharge location CAUTION DO NOT TRANSPORT A NITROGEN CYLINDER WITH ANY REMAINING PRESSURE WITHOUT INSTALLING THE PROTECTIVE SHIPPING CAP VENTING DEVICE STANDARD onall Stationary extinguishers OPTIONAL on Wheeled extinguishers A venting device has been installed on all Stationary extinguishers to provide a means of safely and easily relieving residual nitrogen pressure from the agent cylinder while utilizing the same pressure to evacuate or blow down the hose OPERATION AFTER THE FIRE HAS BEEN SUCCESSFULLY EXTINGUISHED AND IT HAS BEEN DETERMINED THAT IT IS COMPLETELY OUT A Confirm that the nozzle lever is in the CLOSED position VALVE Close the nitrogen valve move T handle to CLOSED position Remove ring pin and CLOSE agent cylinder valve Q Valve A in drawing to prevent further chemical from on gt Or DISC ASY Ce entering the hose 4 Remove ring pin and OPEN pressure vent valve Valve B in drawing to allow nitrogen gas to by pass the chemical and pressurize the hose
12. Succeeding loops are alternated reverse front reverse etc for six full loops 4 Adjust the loops so that the nozzle fits into the nozzle mount Loops should be approximately the same size lt 8 gt
13. e height of the chemical in the cylinder when determining agent fill Dry chemical settles and the only true indication of agent fill is to weigh the extinguisher and compare with the weight indicated on the nameplate label 11 Place the service kit VENT SPACER P N 01530 on top of the agent cylinder fill opening collar Check again to see that the fill cap thread vent is clean and that the agent fill cap gasket is in place Install the agent fill cap securely over the vent spacer CAUTION STEP 12 THE AGENT CYLINDER CAP THREADS MUST BE CLEAR AND THE CAP SE CURELY INSTALLED ONTO THE VENT SPACER AND AGENT CYLINDER TO ALLOW PRES SURE TO SLOWLY VENT AFTER PERFORMING THE SIPHON TUBE CLEARING AND GAS TUBE INTEGRITY CHECKS 12 To perform a siphon tube clearing and gas tube integrity check a Remove the service kit AGENT HOSE ADAPTER P N 01455 from the discharge hose assembly and install it securely onto the agent cylinder siphon tube outlet b Using a regulated nitrogen pressure source set to the extinguisher operating pressure slowly and briefly pressurize the agent cylinder the siphon tube should clear within a couple of seconds and the agent cylinder pressure slowly vent from the fill cap thread vent Pressure and or dry chemi cal leaks from the gas tube inlet port where the hose connects will indicate a defective gas tube and will require that the agent cylinder be emptied and the gas tube replaced c Close the nitrogen pressure
14. ed moisture seal and moisture seal gasket from female hose coupling Replace with new P N 07411 Moisture Seal Assembly Follow instructions printed on the P N 07411 package Remove agent fill cap and gasket Clean lubricate and set parts aside Check the condition of remaining chemical replace any dry chemical that is contaminated or caked Fill extinguisher with the type and amount of dry chemical shown on the extinguisher label verify gross weight Install the fill cap and tighten securely lt 6 gt 10 1 WARNING DO NOT OVERFILL THE EXTINGUISHER THIS COULD CAUSE A MALFUNCTION OR PREMATURE RUPTURE OF THE SAFETY DISC DO NOT MIX TYPES OF AGENTS THIS CAN CAUSE A DANGEROUS PRESSURE BUILD UP AND REDUCE EXTINGUISHER EFFECTIVENESS Install the 55 ft nitrogen cylinder pressurized to 2015 psi remove the shipping cap remove temporary shipping ring pin install large ring pin and lockwire seal T quick release valve Place nitrogen cylinder on the extinguisher tighten nuts securely and attach the nitrogen hose On a handwheel type nitrogen valve a lead wire seal tamper indicator must be in place Re attach the discharge hose to the extinguisher tighten hand tight plus a 1 4 turn Properly coil the hose onto the storage rack Reattach the shutoff nozzle firmly to the hose and store it in the mount with the shutoff lever in the CLOSED forward position Record the service date on the inspection tag and place the
15. extinguisher in its proper location TROUBLESHOOTING GUIDE WARNING BEFORE ATTEMPTING TO CORRECT ANY LEAKAGE PROBLEM BE SURE THAT THE AGENT CYLINDER IS COMPLETELY DEPRESSURIZED ALWAYS USE CAUTION WHEN OPENING THE SHUTOFF NOZZLE OR ANY OTHER CONNECTION AS A LEAKING NITRO GEN CYLINDER VALVE SEAT MAY HAVE PRESSURIZED THE AGENT CONTAINER REFER TO THE RECHARGE PROCEDURE FOR PROPER METHOD OF DEPRESSURIZATION PROBLEM Nitrogen cylinder gauge reads low or high Nitrogen pressure is too low Valve is closed Tamper seal is intact Pressure in agent cylinder and the nitrogen cylinder Nitrogen pressure is too low Valve is closed Tamper seal is intact No pressure observed in the agent cylinder Shutoff nozzle lever does not move freely Unable to remove the agent cylinder cap Nitrogen hose cut cracked or abraided Chemical agent and pressure leaking from the safety disc assembly CORRECTIVE ACTION Temperature may have affected the pressure reading Temperature F 35 70 120 Temperature C 2 21 49 Recommended Pressure psi 1880 2015 2200 mPa 13 0 13 9 15 2 Minimum Pressure psig 1590 1700 1900 mPa 11 0 11 7 13 1 No corrective action is required if the pressure is 2 Note lt 7 gt within parameters stated above Valve seat has leaked and has pressurized the agent cylinder Follow RECHARGE PROCEDURE for restoring the extinguisher to service Leakage in the nitrogen valve at other than the
16. ose T Disconnect the discharge hose assembly from the agent cylinder Make sure that the hose and nozzle are unobstructed and that the P N 7411 Moisture Seal is undamaged and properly seated on the agent cylinder discharge fitting Reconnect the discharge hose to the agent cylinder and with the nozzle in the closed forward position place it on the storage rack See Page 8 Record the date the unit is being placed into service on the inspection tag and attach it to the extinguisher Remove the caution not charged tag INSTALLATION Do not place this extinguisher close to a potential fire hazard Amerex recommends location at a 50 foot minimum distance from the hazard with an unobstructed access Avoid placing itin an extremely hot or cold place The temperature range for this extinguisher is 65 to 120 F 54 to 49 C Keep the extinguisher clean and free from dirt ice chemicals and other contaminants which may interfere with its proper operation DO NOT FUNCTIONALLY TEST THIS FIRE EXTINGUISHER Testing or any use may cause the extinguisher to gradually lose pressure and become ineffective OPERATION NOTE Persons expected to use this extinguisher should be trained in initiating its operation and in the proper fire fighting technique Familiarize all personnel with this information before an emergency occurs Move the extinguisher to within approximately 50 feet of the fire site KEEP EXTINGUISHER UPRIGHT REMOVE RING SA
17. source and allow all pressure to slowly vent from the thread vent port on the fill cap d AFTER ALL PRESSURE HAS BEEN RELIEVED SLOWLY OPEN THE FILL CAP AND REMOVE TEST KIT VENT SPACER e Re examine the dry chemical agent to determine if any obstructions were cleared from the siphon tube and have risen to the surface f Clean the fill cap and agent cylinder thread surfaces Install fill cap gasket and securely install fill cap 13 Disconnect the high pressure hose from the nitrogen cylinder valve Securely install the service kit NITROGEN CYLINDER PRESSURE CHECK GAUGE ASSEMBLY P N 01300 to the nitrogen cylinder valve outlet and verify the indicated cylinder gauge pressure Nitrogen pressure should conform to the tem perature correction chart provided in the Trouble Shooting section of this manual Close the nitrogen cylinder valve and disconnect the Pressure Check Gauge Assembly WARNING IF THE NITROGEN CYLINDER VALVE HAS A T HANDLE QUICK OPENING OR A HANDWHEEL QUICK OPENING TRIP LEVER RELEASE THE SAFETY VENT PLUG SHIPPED WITH THE EXTINGUISHER OR THE TEST KIT SAFETY VENT PLUG P N 01560 MUST BE INSTALLED TO PROTECT SERVICE PERSONNEL FROM A HIGH VE LOCITY DISCHARGE IN CASE THE LEVER IS ACCIDENTALLY OPENED 14 Install a new Amerex P N 7411 Moisture Seal per instructions in the package Securely connect the dis charge hose to the extinguisher When assembling the hose to the agent cylinder or nozzle to the lt 5 gt 15 16
18. te of manufacture on the extinguisher nameplate or on the agent cylinder dome The agent cylinder discharge hose assembly and nitrogen supply hose must be hydrostatically tested every 12 years Test pressures agent cylinder 500 psi 3447 kPa hose assembly 300 psi 2068 kPa nitrogen supply hose 3 000 psi 20 682 kPa 4 Check the hydrostatic test date on the crown of the nitrogen cylinder The nitrogen cylinder must be retested in accordance with D O T regulations every 5 years 5 Check the gauge on the nitrogen cylinder If the pressure is below 1700 psig 11 7 mPa repressurize the cylinder to 2015 psig 13 9 mPa or replace it A low gauge pressure may indicate leakage Check for leaks A low gauge reading may also result from low temperature See the temperature pressure relationship chart in the Troubleshooting Guide Check the tamper indicator lockwire seal on the nitrogen valve and replace if necessary 6 Wheeled extinguishers inspect the wheels to insure they rotate freely Lubricate as required Stationary extinguishers check to insure that any mounting fixtures are secure WARNING OPEN THE SHUTOFF NOZZLE HANDLE SLOWLY ANY PRESSURE IN THE AGENT CYLINDER WILL CAUSE THE EXTINGUISHER TO DISCHARGE BE PREPARED FOR A POSSIBLE DIS CHARGE AND NOZZLE RECOIL ANY EVIDENCE OF AGENT IN THE NOZZLE INDICATES THAT THE UNIT MAY HAVE BEEN USED AND THE USE NOT REPORTED lt 4 gt 7 Disconnect the discharge hose from the
19. xtinguisher IF A CLOSED RECOVERY SYSTEM IS NOT AVAILABLE PROCEED AS FOLLOWS To depressurize Close the T handle on the nitrogen valve or handwheel valve if so equipped b Carefully tip extinguisher over until it rests on both wheels and handle In this position much of the agent will remain in the cylinder c Open nozzle valve slowly to clear hose of any remaining pressure and chemical be prepared for a recoil and discharge of agent d Insure that all pressure has escaped before further disassembly e Stand extinguisher upright after complete depressurization Complete items 1 6 of Maintenance Procedures Carefully remove the fill cap While performing this procedure all parts and seals should be cleaned inspected and replaced where necessary Remove shutoff nozzle assembly from discharge hose and clean thoroughly Check to make sure that the valve is closed when the lever is in the foward position toward the nozzle tip Detach the nitrogen hose from the nitrogen cylinder T handle valve remove and save large ring pin and install temporary ring pin Install the shipping cap Unscrew the nitrogen cylinder brackets and remove the nitrogen cylinder from the extinguisher Remove the 50 ft discharge hose from the storage rack and disconnect the hose from the agent cylinder fitting Blow out any dry chemical agent remaining in the hose Clean hose agent cylinder fitting and gaskets Remove remainder of ruptur
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