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CYLINDER REPLACEMENT
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WARNING
SEE THE COMPLETE NIOSH APPROVAL
LABEL (SCOTT DOCUMENT P/N 10012360)
SUPPLIED WITH THESE INSTRUCTIONS
FOR CYLINDER AND VALVE ASSEMBLIES
APPROVED FOR USE WITH SPECIFIC
SCOTT AIR-PAK MODELS.
THE USE OF ANY AIR CYLINDER OTHER
THAN A CYLINDER AND VALVE ASSEMBLY
APPROVED FOR USE WITH THE SPECIFIC
SCOTT AIR-PAK RESPIRATOR MODEL BE-
ING SERVICED MAY RESULT IN LOSS OF
AIR FROM THE CYLINDER OR IMPROPER
OPERATION OF THE RESPIRATOR WHICH
COULD LEAD TO SERIOUS INJURY OR
DEATH.
WARNING
NEVER USE A CYLINDER WITH A DAM-
AGED CYLINDER VALVE ASSEMBLY OR A
CYLINDER VALVE ASSEMBLY WITH DAM-
AGED THREADS. LEAKAGE MAY OCCUR
WHICH COULD CAUSE A LOSS OF
BREATHING AIR OR A SUDDEN RELEASE
OF HIGH PRESSURE AIR RESULTING IN
SERIOUS INJURY OR DEATH.
FIGURE 6
CYLINDER RETENTION
RETENTION
STRAP
LATCH
PLATE
CYLINDER REPLACEMENT PROCEDURE
Depleted or partially depleted SCBA cylinders should be replaced with
full cylinders as soon as possible. The cylinder replacement proce-
dure can be carried out by the user of the respirator provided the user
removes the backframe assembly and places it on solid support. See
CHANGING THE CYLINDER BY THE RESPIRATOR USER section of
this instruction. Cylinder replacement may be performed while the user
is wearing the backframe assembly, if the user is assisted by a sec-
ond individual. See CHANGING THE CYLINDER WITH AN
ASSISTANT section of this instruction.
Only cylinders of the correct rated pressure may be used as replace-
ment cylinders. SCOTT AIR-PAK NxG2 model 2.2 SCBA’s must use
only cylinder and valve assemblies marked for 2216 psig service.
SCOTT AIR-PAK NxG2 model 4.5 SCBA’s must use only cylinder and
valve assemblies marked for 4500 psig service.
When replacing cylinders on SCOTT AIR-PAK NxG2 model 2.2 SCBA’s,
there is one 30-minute rated cylinder capacity which may be used on in
the model 2.2 SCBA. When replacing cylinders on SCOTT AIR-PAK NxG2
model 4.5 SCBA’s, there are three different capacity cylinders which may
be used interchangeably in the model 4.5 SCBA: the 30-minute rated
cylinder, the 45-minute rated cylinder, and the one hour rated cylinder.
Always inspect the cylinder valve assembly and the SNAP-CHANGE
connector on the cylinder valve assembly before connecting to the
pressure reducer coupling. Never use a cylinder with a damaged cyl-
inder valve assembly or a cylinder valve assembly with damaged
SNAP-CHANGE connector.
CHANGING THE CYLINDER BY THE RESPIRATOR USER
To replace a depleted or partially depleted cylinder proceed as
follows:
1. Leave the area requiring respiratory protection and be certain that
respiratory protection is no longer required. Doff the facepiece.
(See TERMINATIONS OF USE section of this instruction.)
2. Push in and rotate the cylinder valve knob clockwise and com-
pletely close the cylinder valve. Release residual air pressure in
the respirator system by opening the purge valve slightly. When
the flow of air from the facepiece stops, close the purge valve fully.
3. Release the waist belt, loosen the backframe harness, and remove
the respirator. Lay the respirator on a solid support with the cyl-
inder facing up.
4. Disengage the cylinder retention strap by gripping the latch plate
as shown in FIGURE 6 and lifting on the end of the latch.
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