Item Brochure

PN 05616 04/2020
9. Remove hose and horn assembly and visually inspect inside valve body. Chemical in the valve body may
indicate that the extinguisher has been partially discharged and shall therefore be recharged. Inspect the
hose and horn assembly for damage and replace if necessary. Blow air through the hose and horn to
insure passage is clear of foreign material.
10. Disassemble valve assembly by removing downtube, spring, and valve stem assembly. Remove collar
O-ring from valve
11. Complete steps 2 through 13 of Recharge Procedure.
RECHARGE
WARNING:
a. Before attempting to disassemble, be sure the extinguisher is completely depressurized.
b. Never have any part of your body over the extinguisher while removing the valve assembly.
c. Use a protective shield between you and the pressure gauge while charging an
extinguisher. Do not stand in front of the gauge if a shield is not available.
d. Use a regulated pressurizing source of dry nitrogen only with a minimum dew point of -
70ºF (-57ºC). Set the regulator to no more than 265 psi (1827 kPa).
e. Check and calibrate regulator gauge at frequent intervals. The regulator gauge shall be
used to determine when the intended charging pressure has been reached. Do not use the
extinguisher gauge for this purpose.
f. Never leave an extinguisher connected to a regulator of a high-pressure source for an
extended period of time. A defective regulator could cause the cylinder to rupture due to
excessive pressure.
g. Do not mix types of dry chemicals in extinguishers, recharge, or recovery systems. Mixing
ABC (acidic base) with Regular, Purple-K, Super-K, or Monnex (alkaline base) dry
chemicals may result in a chemical reaction capable of developing a dangerous pressure
buildup.
RECHARGING PROCEDURE
1. Perform steps 1-12 of the "Complete Maintenance (Six-Year Teardown)" section.
2. Thoroughly clean all parts of the disassembled valve with a soft bristle brush or soft cloth. Blow the valve
out with air or nitrogen. Inspect the spring and downtube assembly, and replace parts if worn or damaged.
Replace the valve stem and collar O-ring. Lubricate the collar O-ring and small O-ring on the valve stem
with V-711 (do not lubricate the valve stem seal).
3. Reassemble the valve assembly, including downtube, and set aside.
4. Remove any chemical remaining in the cylinder and check the condition. Properly dispose of any
chemical that is contaminated or caked.
5. Inspect the cylinder interior following CGA Visual Inspection Standard C-6.
6. Using an accurate scale, fill cylinder with the correct amount and type of dry chemical specified on the
label (nameplate). Use Amerex chemical which has been kept free of moisture and contamination. See
Warning (g) – DO NOT MIX TYPES OF CHEMICALS.
7. Clean cylinder collar O-ring seat and collar threads with a small brush and then wipe off surfaces with a
clean cloth to remove dust. Lightly brush the collar O-ring seat with V-711.
8. Carefully center the downtube, and install valve assembly hand tight to the cylinder (the bottom of the
valve body shall touch the top of the cylinder collar). Attach the nitrogen charging adapter to the male
hose connector. Valve installation can be made easier by tapping the sidewall of the cylinder with a rubber
mallet as the downtube is eased into the cylinder.
9. With the extinguisher properly secured in an upright position, connect your nitrogen pressurizing line with
a quick connect to the nitrogen charging adapter. Pressurize extinguisher with dry nitrogen to 240 psi.
Nitrogen supply regulator shall be set to no more than 265 psi. This will insure proper aeration of the
chemical.
10. Check extinguisher for leaks by applying detecting fluid or a solution of soapy water to the nitrogen
charging adapter orifice, around the collar O-ring sealing area, cylinder welds, and gauge. Remove the