Product Manual

PN 05618 04/2020
5. Check the horn shutoff lever for freedom of movement (squeeze and release several times). If the
operation is impeded, disassemble the nozzle, replace parts, and/or properly lubricate as necessary.
Make sure that the horn is clear and unobstructed.
WARNING: SQUEEZE HORN SHUT OFF LEVER SLOWLY. CARBON DIOXIDE MAY HAVE BEEN
LEFT IN THE HOSE FROM A PREVIOUS DISCHARGE. BE PREPARED FOR A
POSSIBLE DISCHARGE AND NOZZLE RECOIL.
6. Remove hose and horn and visually inspect inside valve body. Inspect the hose, and replace if the hose
is cut or cracked. Inspect the horn assembly for damage, and replace if it is brittle, cracked, or deformed.
Blow air through the hose and nozzle assemblies to insure passage is clear of foreign material.
CAUTION: CARBON DIOXIDE HOSE ASSEMBLIES HAVE A CONTINUOUS METAL BRAID
THAT CONNECTS TO BOTH COUPLINGS TO MINIMIZE STATIC SHOCK. A HOSE
CONTINUITY TEST SHALL BE PERFORMED USING A BASIC CONDUCTIVITY
TESTER CONSISTING OF A FLASHLIGHT HAVING AN OPEN CIRCUIT AND A SET
OF TWO WIRES WITH A CONDUCTOR (CLAMPS OR PROBE) AT EACH END.
NFPA 10
NOTE: Carbon Dioxide hose assemblies require hydrostatic testing every 5 years to the same
test pressure as the cylinder (3000 psi [20.69 MPa])
7. Inspect the valve assembly for corrosion or damage to hose thread connection. Replace valve assembly
or component parts as necessary following the proper depressurization and recharge procedures. If valve
removal is necessary, complete all steps in the Recharge Procedure. Valve removal and/or valve part
replacement shall be made only after completely discharging the contents of the cylinder.
8. Inspect the wheels to insure they rotate freely. Lubricate as required.
9. Check carriage assembly for loose nuts, bolts, frame distortion, or damage. Check welds for damage or
corrosion. Replace damaged parts, or make repairs as necessary
10. Reinstall horn to shut off valve and valve to hose. Reconnect the hose to the agent cylinder. Properly coil
the hose on the rack and horn in the clips.
11. Weigh extinguisher, and compare with the weight printed on the Pictogram operating instruction on the
label (plus the weight of the cylinder(s) stamped on the cylinder valve(s). Recharge extinguisher if weight
is not within indicated allowable tolerances (more than 5 lbs. per cylinder).
12. Install a new tamper seal(s), and record service data on the extinguisher inspection tag.
13. If the extinguisher has been moved to perform service, make sure it is returned to its proper location.
RECHARGE
RECHARGING NFPA 10 is the replacement of the extinguishing agent.
RECHARGING PROCEDURE
WARNING: Before attempting to recharge, be sure the extinguisher is completely empty and
depressurized. Use only an approved source of carbon dioxide (see minimum specifications
in NFPA 10 Inspection, Maintenance, and Recharging). Do not use dry ice converters. Use
an approved pump, hose, and recharge adapted to insure safe and efficient recharge
operations.
1. Perform steps 1 through 10 of the Maintenance procedure.
2. Discharge all remaining carbon dioxide from the extinguisher.
NOTE: The Model 334 & 335 (100 lb.) extinguishers have two 50 lb. cylinders manifolded to a
common discharge hose. The manifold must be removed before attempting to recharge the
cylinders.
3. Place 50-lb. cylinder on an accurate scale (the full weight – cylinder, valve, and CO2 is stamped on the
valve). Install recharge adapter. Connect carbon dioxide supply line to the recharge adapter.
4. Move “T” handle on the cylinder valve to the open position, and pump 50 lbs. (22.7 KG) of clean, dry
carbon dioxide into the cylinder.