9
RECHARGE
WARNING
a.
Before attempting to disassemble, be sure the extinguisher is completely depressurized.
To depressurize – hold the extinguisher in an inverted position and slowly squeeze the
discharge handle and lever. See trouble shooting section for more details.
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
minus 70
o
F (minus 57
o
C). Set the regulator to no more than 25 psi above the operating
pressure.
e. 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.
f.
Never leave an extinguisher connected to a regulator of a high-pressure source for an
extended period. A defective regulator could cause the cylinder to rupture due to excessive
pressure.
RECHARGING PROCEDURE
RECHARGING is the replacement of the extinguishing agent and the propellant gas
1. Perform steps 1 through 10 of the "Complete Maintenance (Five Year Teardown)" section.
2. Thoroughly rinse and 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 collar O-ring, valve stem, spring,
and dip tube assembly, and replace parts if worn or damaged. Ensure siphon tube screen is not
blocked. Ensure handle and lever move freely. Lubricate the collar O-ring and small O-ring on the
valve stem with Visilox V-711 (do not lubricate the valve stem seal).
3. Reassemble the valve assembly, ensuring siphon tube is firmly tightened securely and set aside.
Squeeze and release handle and lever to ensure freedom of movement and stem returns freely.
4. Remove any water remaining in the cylinder. Rinse the cylinder with clean water.
5. Inspect the cylinder interior following CGA Visual Inspection Standard C-6.
6. Ensure overfill tube correctly fully inserted into threaded neck. Then, using an accurate scale, fill
cylinder with the correct amount of
deionized water
specified on the label (nameplate).
Only
refill with deionized water with conductivity of less than 1.0 us/cm
.
Non deionized water will
invalidate the class C capability. Do not mix deionized water with non-deionized in
extinguisher content.
When filled correctly within stated weight limits, the deionized water level should not enter the
overfill tube.
Deionized water volume range for WM6L is 5.85-6.15L and for WM2.5GAL is 2.438-2.563 Gal.
CAUTION: Filling by eye alone could cause potentially dangerous overfilling – always use a
scale.
7. Carefully center the dip tube and install valve assembly aligning center of gauge with center of
Summary of Contents for WM2.5GAL
Page 14: ...14 APPENDIX A...
