PREPARING THE C420 PAPR FOR USE
CHECKPOINTS BEFORE USE
1. Check that all parts of the respirator are complete and
undamaged. See the Inspection section for inspection
procedures.
2. Check that the cartridge or canister approval is appro-
p
riate and effective against the contaminant in the use
environment. Always use two MSA cartridges or can-
i
sters of the same type.
DO NOT cross thread any C420 PAPR components
during assembly. Cross threading can cause the con-
nection to feel tight, but a sufficient seal would not be
achieved. Failure to follow this warning can result in
serious personal injury or death.
INSTALLING THE WAISTBELT
1. Note the lacing path of the belt through the male
buckle.
2. Remove the male buckle and keeper loop from the
end of the belt.
3. Thread the belt through the two belt loops on the back
of the blower assembly.
4. Replace the keeper loop and lace the male buckle
back onto the belt.
Note: Ensure the belt is properly tightened so that the
C420 PAPR blower does not fall off or slide down the
body during use.
INSTALLING THE BATTERY PACK
Note: Each battery cap assembly has a retaining lanyard
to prevent loss.
Lithium-Sulfur Dioxide (LI-SO2) Battery Pack
When powering the blower assembly with the LI-SO2
Battery Pack, use the black battery cap assembly sup-
plied with the C420 PAPR blower assembly.
Nickel-Metal Hydride Battery Pack
Note: Before initial battery pack use, or if battery pack
has not been used for an extended period of time (several
months), perform (3) 6-hour charge/4-hour discharge
cycles for optimum battery performance. The discharge
cycles should be completed with the blower running in a
non-hazardous environment, with no breathing tube or
cartridges attached to the blower.
Note: See the Charging the C240 Rechargeable Battery
section for detailed battery charger use instructions.
When powering the blower assembly with the NiMH
B
attery Pack, use the green battery cap assembly sup-
plied with the NiMH Battery Pack.
D
O NOT completely discharge a rechargeable battery.
Rechargeable batteries must not be used for more
t
han four (4) hours at a time. Failure to follow this cau-
tion can result in reduced airflow and can cause the
battery to be permanently damaged.
Installing the Green Battery Cap Assembly (for NiMH
Battery Packs only)
1. Remove the black battery cap assembly by turning it
counter-clockwise.
2. Feed the split ring on the retaining lanyard through the
securing hole on the C420 PAPR blower housing.
3. Retain the black cap assembly for possible future use
with LI-SO2 Battery Packs.
4. Attach the green battery cap assembly by feeding the
split ring on the retaining lanyard completely through
the securing hole on the C420 PAPR blower housing.
Installing the Battery Pack into the Battery
Compartment of the Blower Assembly
DO NOT use any battery which shows signs of dam-
age, such as bulging, swelling, disfigurement, or liquid
in the plastic wrap. Failure to follow this warning can
result in serious personal injury or death.
1. Ensure the blower switch is in the “OFF” position.
Note: Damage may occur to the battery if the switch is
left in the “ON” position when the battery is installed.
2. Remove the battery cap assembly from the C420
PAPR blower by turning it counter-clockwise.
3. Remove the battery from its packaging.
4. Inspect the battery for signs of damage.
The Lithium-Sulfur Dioxide (LI-SO2) Battery Pack used
in this equipment contains pressurized Sulfur Dioxide
(SO2) gas. The gas is toxic and the battery must not
be abused in any way which may cause the battery to
rupture. DO NOT handle the battery directly if you
detect an odor like that of vinegar or rotten eggs.
Such odor indicates exposure to battery gas leakage,
which can lead to serious personal injury or death.
9
TAL 706 (L) Rev. 2 - 10072074
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