Amerex 08220 - Manual (Page 7)

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4. Use a regulated pressurizing source of ARGON ONLY. Set the regulator to no more than 220
psi (1520 kPa).
5.
Check and calibrate regulator gauge at frequent intervals. The regulator gauge should be
used to determine when the intended charging pressure has been reached. Do not use the
extinguisher gauge for this purpose.
6.
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.
7.
Do not mix types of chemicals in extinguishers, recharge or recovery systems. Mixing ABC,
Regular, or Purple K dry chemicals with a dry powder agent could cause a serious flare up or
explosion if the dry chemical were to contact a combustible metal fire.
RECHARGE PROCEDURE
1.
Perform steps 1 through 4 of the "Complete Maintenance (Six-Year Teardown)" section including
those required in the "Maintenance Procedure."
2.
Thoroughly clean all parts with a soft bristle brush or soft cloth. Blow the valve and downtube
out with air or argon. Inspect the collar o-ring, valve stem, spring and downtube assembly –
replace parts if worn or damaged. Lubricate the collar o-ring on the valve stem with Visilox V-
711. DO NOT LUBRICATE THE VALVE STEM SEAL.
3.
Reassemble the valve assembly, including downtube, and set aside.
4.
Remove any dry powder remaining in the cylinder. Properly dispose of any dry powder that is
contaminated or caked.
5.
Inspect the cylinder interior following CGA Visual Inspection Standard, Pamphlet C-6.
6.
Fill Amerex Model 570/B570 cylinder with 30 pounds (13.6 KG) of Amerex Super D (Sodium
Chloride) dry powder. Use Amerex dry powder that has been kept moisture and contamination
free.
7.
Clean cylinder o-ring seat and threads inside of cylinder collar with a small brush and wipe
surfaces with a clean damp cloth to remove dust. Lightly brush the collar o-ring seat with Visilox
V-711. Install the operating valve/downtube assembly hand tight.
8.
Attach the charging adapter to the valve discharge port.
WARNING: THIS EXTINGUISHER IS FACTORY PRESSURIZED USING ARGON. ARGON
IS AN INERT GAS THAT WILL NOT ADVERSELY REACT WITH COMBUSTIBLE METALS.
NITROGEN PRESSURIZING GAS COULD CAUSE A REACTION WHEN USED ON CERTAIN
TYPES OF COMBUSTIBLE METAL FIRES. DRY AIR PRESSURIZATION SHOULD NEVER
BE USED, AS EVEN THE SLIGHTEST AMOUNT OF MOISTURE WILL CAUSE A VIOLENT
REACTION WITH CLASS D MATERIALS.
9.
With the extinguisher properly secured in an upright position, connect your argon pressurizing
line with a quick connect to the charging adapter. Set the Argon supply cylinder regulator to no
more than 220 psi (1520 kPa). Depress the extinguisher operating valve lever and pressurize