Amerex Vehicle Suppression Systems

 

Maintenance

Semi Annual Maintenance:

 
NFPA 17 requires the following minimum maintenance on a semi-annual basis. Any deficiencies that are found and corrected should be documented with one copy provided to the equipment owner and a second copy kept for permanent record. Maintenance may be performed only by Amerex factory trained personnel.

[1] Check that the hazards have not changed. Look for changes in vehicle operation or cleaning procedures that may have increased the hazard. Compare with the original vehicle hazard analysis.
[2] Examine all thermostats, agent cylinders, valves, piping/hose assemblies, nozzles, alarms, and auxiliary equipment.
[3] Verify that the discharge network hoses are not obstructed. (Specific tests follow in the Amerex semi-annual maintenance instructions)
In addition, Amerex requires the following minimum maintenance on a semi-annual basis.
[4] Consult vehicle operating and maintenance personnel to determine if any problems with the extinguishing system or with the vehicle itself have been encountered that may have affected the extinguishing system.
[5] Service the agent cylinders. Clean cylinder to remove dirt, grease or foreign material. Check to make sure that the instruction nameplate is securely fastened and legible. Inspect the cylinder for corrosion, abrasion, and dents or weld damage. Hydro test the cylinder if any of these conditions are found or you doubt the integrity of the cylinder. (See Section 9)
WARNING: ALWAYS INSTALL SHIPPING PLATE AND ANTI-RECOIL PLATE WHEN TRANSPORTING A PRESSURIZED AGENT-CYLINDER:
NOTE: When cleaning, avoid use of solvents around the pressure gauge. They could seriously damage the plastic gauge face.
[6] Service the Discharge Valve. Inspect the discharge valve for damaged, missing, or substitute parts. Only factory replacement parts are approved for use on Amerex fire suppression systems. Check the air valve, cap or agent cylinder pressure switch as applicable to make sure they are tight and providing a good seal.
Check the fusible plug pressure relief to confirm that it is free of corrosion and has not been altered.
Remove control head and check the valve stem return spring and retaining washer in the top of the valve for corrosion. Depressurize cylinder and rebuild valve if defects are found. See proper method of depressurizing and reclaiming chemical in System Recharge procedures in Section 9. System rebuilding and recharging may only be done by individuals certified by Amerex and those having jurisdiction in your area.
[7] Visually inspect the pressure gauge on the discharge valve:
a. If gauge is bent or damaged, depressurize and replace.
b. If pressure is low, check for leaks, or partial discharge. Depressurize the agent cylinder and recharge if gauge pressure is low.
c. If over pressurized (overcharged), depressurize the agent cylinder and follow recharge instructions.
If any of the above conditions are found, contact your Amerex servicing distributor for corrective action.
[8] Service the discharge networks. Clean the discharge fitting and all nozzles to remove dirt, grease or foreign material. Disconnect discharge hose from agent cylinder by unbolting retaining flange. Inspect discharge outlet for extinguishing chemical residue. Extinguishing chemical residue is often the sign of an unreported discharge. Confirm that all hoses are free of obstructions: Remove all nozzle blow-off caps.
Attach an Amerex P/N 12129 Discharge Network test adapter to the discharge fitting and connect to a compressed air source. Blow air through the hose. Confirm that free flow is present at each nozzle.
Part Number 13980 Rev. F April 2001 Page 8-2 Follow each discharge hose along its entire length checking for cuts or abrasions. Replace any damaged sections of hose. Check all hose connections for tightness. Repair any loose joints.
Confirm that all nozzles are properly aimed. Inspect all blow-off caps with the retaining loop arching downward. Discard any caps that are worn or cracked, or that have lost their flexibility. Reapply silicone grease sparingly to the inside of skirt of each blow-off cap and replace all blow-off caps. Inspect discharge fitting o-ring and replace if worn. Reconnect discharge fitting to discharge valve. Bolt retaining flange securely in place.
[9] Service the electric control head. See Section 10 for exploded drawing. Remove the electric control head from the agent cylinder discharge valve by removing the two 5/16 in. bolts. Inspect the retaining ring, piston and control head body. Remove the electric actuator from the top of the control head by unplugging the wiring connector and then unscrewing it from the control head. Inspect all items for damage or corrosion. The retaining ring should be loose and visible from the bottom side of the Electric Control Head. Replace if the integrity of any component is in doubt. Electric Actuator P/N 14036 must be replaced after being in service six years. Note manufacturing date on tag. Replace if six years has elapsed.
[10] Service the detection network (Automatic system installations only). Clean all thermostats and Firetrace tubing if so equipped. Also clean the Circuit Monitor or Control Panel to remove dirt, grease and foreign material. Thermostats may be pressure washed. Control Panel surfaces should be cleaned with a damp cloth and mild soap and water solution. Check thermostats for dents, punctures, or other damage.
Thermostats must not be painted. Replace if damaged or painted. Check all exposed wiring for cuts, abrasion, or heat damage. Check power supply (battery) connections for tightness and wire fatigue. Check that all other wiring connections are tight and sealed from the weather. Correct any deficiencies discovered.
[11] Test the detection network. Unplug the electric actuator and attach it to the Alarm Test Module, Amerex P/N 14027. Check that the reset button on the alarm module is depressed. When the alarm test module is connected, the circuit-monitor or control panel should indicate a normal condition. Only the green "System OK" LED should be illuminated. Test the function of each spot thermostat. Hold an electric heat gun or other suitable heat source near the spot thermostat until the contacts close. Do not use an uncontrolled heat source such as a torch as thermostats may be permanently damaged! For Firetrace detectors, relieve air pressure from the air cylinder by pressing the valve stem pin. Do not heat Firetrace sensor tubing to test. After testing re-tighten the valve stem cap once re-pressurized, and check that the ferrule nut holding the tubing to the cylinder is wrench tight.
Check each Manual Actuation Switch by pressing and releasing. The Control Panel must go into alarm when each Manual Actuation Switch is pressed.
Warning: Do not perform this test on the system if the electric actuator and control head is installed and connected. System discharge will result.
Warning: Exercise extreme care when following this procedure. Make certain that no hazards exist that could be ignited by the heat source.
Part Number 13980 Rev. F April 2001 Page 8-3 When the thermostat or detector contacts close, the Circuit Monitor or Control Panel will enter alarm mode. The green “System OK” LED on the Circuit Monitor/Control Panel will turn off, the red "Fire" LED and “Service System” LED will illuminate, the audible alarm will sound and the time delayed relay (engine shut down) will begin to count down. Remove the heat source or re-pressurize the Firetrace air cylinder to 70 psi as applicable. When the thermostat cools and the contacts reopen, or the Firetrace air cylinder has been re-pressurized to 70 psi. The red “Fire” and “Service System” LEDs will remain lit and the alarm will continue to sound. If the yellow LED on the Squib Simulator is off, then the detector has reopened or is reset. Press the button of the Alarm Module. The Circuit Monitor or Control Panel will return to the normal mode. The system will not reset until the thermostats are cooled or reset. Repeat this test for each thermostat. Repair any circuits and replace any thermostats that do not function properly. Verify that all thermostats have cooled as indicated by an illuminated green "SYSTEM OK" LED on the front of the Circuit Monitor or Control Panel and reconnect squib connector lead to squib.
Detail of Alarm Test Module:
[12.] Test the agent cylinder pressure switch circuit. On installations so equipped, unplug the switch at its plug socket. The Control Panel will enter the fault mode (red “Service System” LED illuminated) as previously described. Reconnect the pressure switch when testing is complete. Repair any circuits and replace any switches that do not function properly.
[13.] Test the function of the internal back-up battery. Insure that the system has been powered by the vehicle battery for at least 24 hours. This insures that the back-up battery is fully charged. Unplug the electric actuator, and attach it to the Alarm Module, Amerex P/N 14027. Check that the reset button on the Alarm Module is depressed. With the connection of the Alarm Module, the Circuit Monitor or Control Panel should now indicate normal condition. Remove the vehicle power supply to the panel by unplugging the fuse holder on the power supply lead. Only the “Service System” LED should be illuminated on the panel. Hold an electric heat gun or other suitable heat source near the spot thermostat until the contacts close. For Firetrace detectors, relieve air pressure from the air cylinder by pressing the valve stem pin. Do not heat Firetrace sensor tubing to test. After testing re-tighten the valve stem cap once re-pressurized, and check that the ferrule nut holding the tubing to the cylinder is wrench tight. Do not press the red button on the Squib Simulator at this time. Restore vehicle battery power to the system by plugging in the fuse holder on the power lead. The system should come up in alarm condition when vehicle battery power is restored. This indicates that the back-up battery has actuated the system. Press the reset button on the Alarm Module and the panel should return to normal condition. Reconnect the electric actuator lead.
[14] Check the last recharge date on the agent cylinder inspection tag. As required by NFPA 17, the dry chemical in stored pressure systems such as the Amerex system must be examined every 6 years to confirm that the chemical is free flowing. If 6 years have elapsed, follow instructions in SYSTEM RECHARGE (Section 9) for proper depressurization and chemical reclaim. Check the date of manufacture stamped on the extinguisher cylinder dome. Cylinder must be hydrostatic (proof pressure) tested every 12 years to the test pressure indicated on the nameplate (700 psi 4827 kpa). If hydro-test is due. See Section 9.

 
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