Amerex 18764 - Manual (Page 10)

Manual 18764 Rev - Page 10
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 thru 12 of the “COMPLETE MAINTENANCE (SIX YEAR TEARDOWN)” section.
2. Remove down tube, spring and valve stem assembly from the operating valve and thoroughly clean all
parts with a soft bristle brush or soft cloth. Blow the valve and down tube out with air or nitrogen. Inspect
the collar o-ring, valve stem, spring and down tube assembly - replace parts if worn or damaged.
Lubricate the collar o-ring and small o-ring on the valve stem with Visilox V-711 (DO NOT LUBRICATE
THE VALVE STEM SEAL). Visilox V-711 is provided as part of the Model 781K Recharge station
assembly.
3. Reassemble the valve assembly, including down tube and set aside.
4. Remove agent fill cap and place to the side. Remove any chemical remaining in the cylinder and check
the condition. Properly dispose of any chemical that is contaminated or caked.
5. Inspect the interior of the cylinder following CGA Visual Inspection Standard, Pamphlet C-6.
6. Clean cylinder collar o-ring seat and collar threads with a small brush and then wipe off surfaces with a
clean damp cloth to remove dust. Lightly brush the collar o-ring seat with Visilox V-711. Install operating
valve/down tube assembly HAND TIGHT.
7. Stand the extinguisher upright on an accurate scale of sufficient size and capacity. Use the Amerex Fill
Station Assembly to accomplish this process. Fill cylinder through chemical agent fill opening with the
correct amount and type of dry chemical specified on the label (nameplate). Use AMEREX chemical
(Included with the Model 781K or 783K Recharge Kit) which has been kept free of moisture and
contamination.
WARNING: FILLING BY EYE ALONE COULD CAUSE POTENTIALLY DANGEROUS OVER-FILLING -
ALWAYS USE A SCALE.
8. Remove agent fill cap 0-ring. Clean cap and cylinder threads with a small brush and wipe surfaces with
a clean damp cloth to remove dust. Inspect o-ring and replace if damaged or deformed. Install o-ring and
lightly brush it and all threads with Visilox V-711. Install agent fill cap HAND TIGHT.
9. Attach the nitrogen charging adapter to the male hose connector on the operating valve.
10. With the extinguisher properly secured in an upright position, connect your nitrogen pressurizing line
with a quick connect to the nitrogen charging adapter. Rotate the operating Tee Handle Pressurizing
Adaptor valve lever to the OPEN position and pressurize extinguisher with dry nitrogen to 240 psi. When
the desired pressure has been reached, rotate the operating lever to the CLOSED position. Shut off
nitrogen supply and remove the quick connect.