Amerex 18764 - Manual (Page 7)

Manual 18764 Rev - Page 7
MAINTENANCE PROCEDURE
(Annually or more often if circumstances dictate)
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 cylinder for corrosion, abrasion, dents or weld
damage. If any of these conditions are found and you doubt the integrity of the cylinder, hydrostatically
test to factory test pressure (480 PSI), using the proof pressure method in accordance with CGA
Pamphlet C-6 and NFPA Pamphlet 10. See proper method of depressurizing and reclaiming chemical in
RECHARGE procedures.
Note: When cleaning, avoid use of solvents around the pressure gauge. They could seriously
damage the plastic gauge face.
2. Inspect the extinguisher for damaged, missing or substitute parts. Only factory replacement parts are
approved for use on Amerex fire extinguishers.
3. Weigh extinguisher and compare with weight printed in the “Recharge” section on the nameplate
(label). Recharge extinguisher if weight is not within indicated allowable tolerances. The Model 781K is
filled using 3-50# pails of Amerex ABC Dry Chemical Model 550. The Model 783K is filled with 3-50# pails
of Amerex PK Dry Chemical Model 515. The unit must be completely empty prior to recharge so as to
accommodate the full recharge agent. DO NOT FILL WITH MORE THAN 150 POUNDS OF DRY
CHEMCIAL AS THE UNITS PERFORMACE WILL BE AFFECTED.
4. Check the date of manufacture stamped on the extinguisher cylinder dome. Cylinder must be
hydrostatically (proof pressure) tested every 12 years to the test pressure indicated on the nameplate
(480 PSI per DOT Requirements).
5. Visually inspect the pressure gauge:
a. if bent, damaged or improper gauge, depressurize and replace
b. if pressure is low, check for leaks
c. if over pressurized (overcharged), depressurize the extinguisher and follow recharge
instructions
6. Remove Ring (Safety) Pin from the manual actuator and discharge nozzle checking for freedom of
movement. Replace if bent or if removal appears difficult.
7. Check the nozzle shutoff lever for freedom of movement (open and close several times). If the
operation is impeded, disassemble the nozzle, replace parts and/or properly lubricate as necessary.
Make sure that the nozzle tip is clear and unobstructed.
WARNING: ALWAYS OPEN THE SHUTOFF NOZZLE HANDLE SLOWLY. ANY EVIDENCE OF
AGENT IN THE NOZZLE INDICATES THAT THE UNIT MAY HAVE BEEN USED AND THE USE NOT
REPORTED. BE PREPARED FOR A POSSIBLE DISCHARGE AND NOZZLE RECOIL.
8. After making sure that there is no residual pressure in the discharge hose, disconnect it from the
operating valve. Blow air through the hose and nozzle assemblies to insure that the passage is clear of
foreign material. Check the couplings, hose and hose gasket for damage or deterioration - replace as
necessary.