Scott SCOTT AIR-PAK NxG2 Installation and operation manual

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SCOTT®AIR-PAK®NxG2™
Pressure-Demand Self Contained Breathing Apparatus (SCBA)
Copyright ©2006 SCOTT Health and Safety, All Rights Reserved.
Typical configurations of SCOTT AIR-PAK NxG2SCBA's with various optional equipment illustrated above.
Appearance of respirators will vary by model. Not all respirators include all features illustrated.
OPERATING & MAINTENANCE INSTRUCTIONS
AIR SAVER
SWITCH
FACEPIECE
FACEPIECE
MOUNTED
REGULATOR
HEADS-UP
DISPLAY
CYLINDER
VALVE
RIC-UAC
CONNECTION
TRI-SLIDE
BUCKLE
CYLINDER AND
VALVE ASSEMBLY
CYLINDER
LATCH
REGULATOR
HOLDER
REGULATOR
QUICK
DISCONNECT
PRESSURE
REDUCER
RIC-UAC
CONNECTION

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Table of Contents
GENERAL DESCRIPTION ............................................................................................................................ 4
SPECIFIC MODEL DESCRIPTIONS ............................................................................................................. 6
SERVICE LIFE ............................................................................................................................................... 7
INTRINSICALLY SAFE LISTING ................................................................................................................... 7
APPROVALS AND CERTIFICATIONS .......................................................................................................... 8
OPTIONS AND ACCESSORIES ................................................................................................................. 10
HEADS-UP DISPLAY ...................................................................................................................................11
REGULAR OPERATIONAL INSPECTION ..................................................................................................12
PREPARATION FOR USE ........................................................................................................................... 15
USE OF RESPIRATOR ................................................................................................................................ 16
TERMINATION OF USE .............................................................................................................................. 18
EMERGENCY OPERATION ........................................................................................................................ 19
RIC-UAC EMERGENCY USE...................................................................................................................... 20
LOW TEMPERATURE OPERATION ........................................................................................................... 22
USE OF THE RIC-UAC IN LOW TEMPERATURE ..................................................................................... 22
CYLINDER REPLACEMENT PROCEDURE ............................................................................................... 23
STANDBY INSPECTION, CLEANING AND STORAGE ............................................................................. 27
BATTERY REPLACEMENT ......................................................................................................................... 29
RESPIRATOR MARKINGS.......................................................................................................................... 31
PERIODIC TESTING ................................................................................................................................... 31
RETIREMENT CRITERIA AND CONSIDERATIONS .................................................................................. 31
ACCESSORIES ........................................................................................................................................... 31
CAUTIONS AND LIMITATIONS................................................................................................................... 32
SPECIFIC LIMITATIONS ............................................................................................................................. 32
SCOTT AIR-PAK NxG2
Pressure-Demand Self Contained Breathing Apparatus (SCBA)

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1Kevlar is a registered trademark of E.I. du Pont de Nemours, Inc.
2Portacount®Plus is a registered trademark of TSI Incorporated
WARNING
THIS RESPIRATOR, IS INTENDED TO
PROTECT THE USER ONLY FROM THE
EFFECTS OF AN OXYGEN DEFICIENT AT-
MOSPHERE AND/OR ATMOSPHERES
CONTAINING TOXIC OR HAZARDOUS
SUBSTANCES BY PROVIDING A SUPPLY
OF RESPIRABLE BREATHING AIR TO A
FACEPIECE SEALED TO THE USER'S FACE.
SOME TOXIC OR HAZARDOUS ATMO-
SPHERES CONTAIN SUBSTANCES WHICH
CAN POISON BY ABSORPTION THROUGH
EXPOSED SKIN. FAILURE TO TAKE ALL
NECESSARY PRECAUTIONS WHEN ENTER-
ING A HAZARDOUS ATMOSPHERE MAY
RESULT IN SERIOUS INJURY OR DEATH.
GENERAL DESCRIPTION
The SCOTT AIR-PAK NxG2self contained breathing apparatus
(SCBA) is a respirator which, when properly maintained and properly
used, is intended to provide respiratory protection to an individual
when entering into, working in and exiting an objectionable, an oxy-
gen deficient and/or unbreathable (toxic) atmosphere.
The SCOTT AIR-PAK NxG2SCBA is to be used only by persons
trained in the use of the respirator and only in conjunction with an
organized respiratory protection program. The SCBA is not to be used
for purposes other than authorized by your respiratory protection pro-
gram. For example, this respirator must not be used underwater.
The SCOTT AIR-PAK NxG2SCBA consists of, at a minimum, a cylin-
der and valve assembly to store a supply of breathing air under
pressure, a backframe and harness assembly to support the cylinder
and valve assembly and pressure reducer on the body, a backframe
mounted pressure reducer to supply air to the breathing regulator, a
facepiece mounted pressure demand breathing regulator, an approved
SCOTT full facepiece and a head harness to secure the facepiece to
the face. All SCOTT AIR-PAK NxG2SCBA's described in this instruc-
tion are equipped with an end of service indicator, a remote pressure
gauge mounted on the wearer's right shoulder strap and an air saver
switch located on top of the breathing regulator. All model respirators
described by these instructions are equipped with shoulder straps,
waist straps and head harnesses made of Kevlar1.
The typical facepiece design incorporates a nose cup, two inhalation
valves and dual voicemitter assemblies which are integral parts of the
approved respirator assembly. The facepiece may be readily detached
from the breathing regulator to allow for utilization of the best fitting
facepiece for an individual user.
The approved facepiece utilized by the SCBA's described by this in-
struction is available in a variety of models and sizes. Users of this
respirator must be properly fitted to a facepiece and trained in the
use of that facepiece with the respirator. The facepiece must be fit-
ted using qualitative or quantitative fit testing procedures in
accordance with OSHA Standard 29 CFR Part 1910 (Occupational
Safety and Health Standards). See also ANSI Standard Z88.2. For
testing in the negative pressure mode using equipment such as a
Portacount®Plus2Respirator Fit Tester, SCOTT facepieces require
use of SCOTT Fit Test Adapter P/N 804057-01. Mask Seal Kit P/N
805655-01 may also be required to attain a proper fit.
WARNING
DO NOT OPERATE THIS EQUIPMENT
WHILE UNDER THE INFLUENCE OF
DRUGS, ALCOHOL, OR ANY MEDICATIONS
OR SUBSTANCES WHICH MAY AFFECT VI-
SION, DEXTERITY, OR JUDGMENT. USERS
OF THIS EQUIPMENT MUST BE IN GOOD
PHYSICAL AND MENTAL HEALTH IN ORDER
TO OPERATE SAFELY. DO NOT USE THIS
EQUIPMENT WHEN FATIGUE PREVENTS
SAFE OPERATION. STAY ALERT WHEN
OPERATING THIS EQUIPMENT. INATTEN-
TION OR CARELESSNESS WHILE
OPERATING THIS EQUIPMENT MAY RE-
SULT IN SERIOUS INJURY OR DEATH.
WARNING
FIT TESTING IN ACCORDANCE WITH OSHA
STANDARD 29 CFR PART 1910 IS RE-
QUIRED AS PART OF THE REQUIRED
TRAINING BEFORE USE OF THIS RESPIRA-
TOR. FAILURE TO PROPERLY FIT AND
TRAIN THE USER IN USE OF THE FACE-
PIECE AND RESPIRATOR MAY RESULT IN
EXPOSURE TO THE HAZARDOUS ATMO-
SPHERE WHICH COULD LEAD TO SERIOUS
INJURY OR DEATH.
WARNING
IMPROPER USE OF THIS RESPIRATOR MAYRESULT IN PERSONAL INJURYOR DEATH. IMPROPER USE
INCLUDES, BUT IS NOT LIMITED TO, USE WITHOUT ADEQUATE TRAINING, DISREGARD OF THE WARN-
INGS AND INSTRUCTIONS CONTAINED HEREIN, AND FAILURE TO INSPECT AND MAINTAIN THIS RESPIRATOR.
READ AND UNDERSTAND ALL INSTRUCTIONS BEFORE ATTEMPTING TO OPERATE OR SERVICE THIS EQUIP-
MENT.
THIS RESPIRATOR IS INTENDED TO BE USED ONLY IN CONJUNCTION WITH AN ORGANIZED RESPIRA-
TORY PROTECTION PROGRAM WHICH COMPLIES WITH THE REQUIREMENTS OF "PRACTICES FOR
RESPIRATORY PROTECTION," Z88.2 AVAILABLE FROM AMERICAN NATIONAL STANDARDS INSTITUTE INC.,
1430 BROADWAY, NEW YORK, N.Y., 10018, OR THE REQUIREMENTS OF OSHA SAFETY AND HEALTH
STANDARD 29 CFR 1910 PARAGRAPH 134 AVAILABLE FROM THE U. S. DEPARTMENT OF LABOR, OC-
CUPATIONAL SAFETY AND HEALTH ADMINISTRATION, OR OTHER PERTINENT NATIONALLY RECOGNIZED
STANDARDS, SUCH AS THOSE PROMULGATED BY THE US COAST GUARD OR THE DEPARTMENT OF DEFENSE.

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The regulator utilized by the SCOTT SCBA is a pressure-demand
breathing regulator mounted directly to the facepiece. The regula-
tor may be removed from the facepiece by operating a spring loaded
thumb latch, rotating the regulator 90 degrees and lifting it from the
facepiece. The breathing regulator is equipped with an air saver/don-
ning switch which can be activated by depressing the rubber covered
switch. Activation of the air saver/donning switch will prevent the
rapid loss of air supply when the system is turned on prior to don-
ning the facepiece, if the facepiece is removed from the face or the
regulator is removed from the facepiece while the cylinder valve is
open. The regulator is also equipped with a red purge knob. The
purge knob is an emergency control which allows air to flow into the
facepiece without breathing on the respirator. The purge control is
also used to release residual air from the respirator after the cylin-
der valve is turned off.
The SCOTT AIR-PAK NxG2SCBA is supplied with a stamped alumi-
num frame assembly (P/N 805846-01). The backframe assembly uses
a unique SNAP-CHANGE™ mechanism to engage the cylinder valve
assembly to the pressure reducer. The upper part of the cylinder is
retained in the backframe assembly by a cylinder retention system.
Refer to the CYLINDER REPLACEMENT PROCEDURE section of this
instruction.
The backframe mounted pressure reducing regulator is a redundant
dual path reducing system. During normal use, air is supplied from
the cylinder and valve assembly to the mask mounted breathing regu-
lator through the primary air path of the pressure reducer. In the event
that the primary air path of the pressure reducer becomes blocked
or fails closed, the secondary pressure reducing air path will auto-
matically begin supplying air to the breathing regulator. When the
secondary path is in operation, the VIBRALERT®end of service indi-
cator alarm will be actuated to warn the user that the primary pressure
reducer path has malfunctioned. Whenever the VIBRALERT end of
service indicator alarm actuates, the user must leave the area requir-
ing respiratory protection at once.
AIR-PAK respirators in compliance with NFPA 1981 (edition 2002) are
fitted with a Rapid Intervention Crew/Company Universal Air Connec-
tion (RIC UAC) System which permits emergency replenishment of
an approved SCBA breathing air supply cylinder from an approved air
supply source while in use. This is not a Quick Charge attachment
and must not be used for routine recharging of the cylinder, for "buddy
breathing", for transferring air from another SCBA cylinder, or any un-
approved use. The RIC UAC is for emergency use only when the
respirator user is incapacitated within the hazardous atmosphere.
WARNING
CERTAIN ENVIRONMENTS MAY REQUIRE
THAT PROTECTIVE MATERIAL COVER
SOME OR ALL OF THE RESPIRATOR IN AD-
DITION TO COVERING THE USER. THE
USER MUST BE ABLE TO ACCESS THE
CONTROLS OF THE RESPIRATOR AT ALL
TIMES. INABILITY TO ACCESS CONTROLS
OF THE RESPIRATOR WHEN THE RESPIRA-
TOR IS NEEDED FOR ESCAPE MAY RESULT
IN SERIOUS INJURY OR DEATH.
WARNING
RESPIRATORS SHALL NOT BE WORN
WHEN CONDITIONS PREVENT A GOOD
FACE TO FACEPIECE SEAL. SUCH CONDI-
TIONS MAY INCLUDE, BUT ARE NOT
LIMITED TO, GROWTH OF BEARDS, SIDE-
BURNS, A SKULL CAP THAT PROJECTS
UNDER THE FACEPIECE, OR TEMPLE
PIECES ON GLASSES. ALSO, THE AB-
SENCE OF ONE OR BOTH DENTURES CAN
SERIOUSLY EFFECT THE FIT OF THE
FACEPIECE. USE OF THE RESPIRATOR
WITHOUT A GOOD FACE TO FACEPIECE
SEAL MAY REDUCE THE DURATION OF
USE AND/OR EXPOSE THE USER TO THE
ATMOSPHERE THE RESPIRATOR IS IN-
TENDED TO PROTECT AGAINST WHICH
MAY RESULT IN SERIOUS INJURY OR
DEATH.
WARNING
USE OR MISUSE OF THIS RESPIRATOR IN
SUCH A MANNER AS TO EXPOSE THE
USER TO THE ATMOSPHERE THE RESPI-
RATOR IS INTENDED TO PROTECT
AGAINST MAY RESULT IN SERIOUS INJURY
OR DEATH.
GENERAL DESCRIPTION
CONTINUED ON NEXT PAGE...

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There are two independent end of service indicator alarms: the VI-
BRALERT alarm mounted inside the breathing regulator and the
electronic HEADS-UP DISPLAY end of service time indicator. When
actuated, the VIBRALERT alarm vibrates the breathing regulator and
facepiece to warn the user of diminishing air supply by both an au-
dible and a tactile warning. The HEADS-UP DISPLAY provides a visual
monitor of the air supply with four lights that appear just below the
facepiece field of vision. A separate low battery light warns the user
that the battery must be changed. The HEADS-UP DISPLAY lights
indicate the cylinder air supply is full to three-quarters with constant
green lights, one-half cylinder with a slowly flashing yellow light, and
warns the user that approximately one quarter or 25% of full cylinder
pressure remains with a rapidly flashing red light. The HEADS-UP
DISPLAY detects cylinder pressure directly and is totally independent
of the VIBRALERT.
Both the VIBRALERT and the electronic HEADS-UP DISPLAY end of
service time indicator alarms actuate to warn the user that approxi-
mately 25% of full cylinder pressure remains in the cylinder and valve
assembly. In other words, the alarms actuate when approximately 3/
4 of the total air supply has been used. Although both the VIBRALERT
and electronic HEADS-UP DISPLAY end of service indicator alarms
are set to actuate at the US Government mandated set point of ap-
proximately 25% of full rated service pressure, they are completely
independent of each other and therefore may not actuate at precisely
the same moment. As stated above, the VIBRALERT end of service
indicator alarm will also actuate if the primary pressure reducer mal-
functions or becomes blocked. In this case, the VIBRALERT alarm
alone will actuate and the HEADS-UP DISPLAY will not. Whenever
any alarm actuates, the VIBRALERT end of service indicator alarm
or the HEADS-UP DISPLAY, the user must immediately leave the area
requiring respiratory protection.
WARNING
THE RESPIRATOR USER MUST IMMEDI-
ATELY LEAVE THE AREA REQUIRING
RESPIRATORY PROTECTION WHEN AN
END OF SERVICE INDICATOR ALARM AC-
TUATES. ACTUATION OF AN END OF
SERVICE INDICATOR ALARM WARNS THAT
APPROXIMATELY 25% OF FULL PRESSURE
REMAINS IN THE AIR SUPPLY CYLINDER
(THAT IS, APPROXIMATELY 3/4 OF THE
TOTAL AIR SUPPLY HAS BEEN USED) OR
THAT THERE IS A MALFUNCTION IN THE
RESPIRATOR. A DELAY IN LEAVING THE
AREA AFTER ALARM ACTUATION MAY RE-
SULT IN SERIOUS INJURY OR DEATH.
GENERAL DESCRIPTION CONTINUED...

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WARNING
THE ATTACHMENT OF COMPONENTS, AC-
CESSORIES, OR DEVICES TO THE SCOTT
AIR-PAK NXG2SCBA WHICH ARE NOT
LISTED ON THE COMPLETE NIOSH LABEL
MAY VOID THE NIOSH APPROVAL AND MAY
DEGRADE THE PERFORMANCE OF THE
RESPIRATOR.
WARNING
THE RESPIRATOR USER MUST IMMEDIATELY
LEAVE THE AREA REQUIRING RESPIRATORY
PROTECTION WHEN AN END OF SERVICE
INDICATOR ALARM ACTUATES. ACTUATION
OF AN END OF SERVICE INDICATOR ALARM
WARNS THAT APPROXIMATELY 25% OF
FULL PRESSURE REMAINS IN THE AIR SUP-
PLY CYLINDER (THAT IS, APPROXIMATELY
3/4 OF THE TOTAL AIR SUPPLY HAS BEEN
USED) OR THAT THERE IS A MAL-
FUNCTION IN THE RESPIRATOR. A DE-
LAY IN LEAVING THE AREA AFTER
ALARM ACTUATION MAY RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
THE USER OF THIS RESPIRATOR MUST
RECEIVE TRAINING IN THE OPERATION OF
THE RESPIRATOR INCLUDING THE OPERA-
TION OF ALL OPTIONS AND/OR ACCESSO-
RIES INCORPORATED IN THE RESPIRA-
TOR. USE WITHOUT PROPER TRAINING
MAY RESULT IN SERIOUS INJURY OR
DEATH. SEE WARNING AT THE BEGINNING
OF PAGE TWO OF THIS INSTRUCTION.
WARNING
ONLY THOSE OPTIONS AND/OR ACCESSO-
RIES AUTHORIZED BY SCOTT AND
APPROVED BY NIOSH MAY BE INSTALLED
IN THIS RESPIRATOR. THE USE OF UNAU-
THORIZED AND/OR UNAPPROVED
OPTIONS OR ACCESSORIES COULD
CAUSE PARTIAL OR COMPLETE FAILURE
OF THE RESPIRATOR WHICH MAY RESULT
IN INJURY OR DEATH.
WARNING
RESPIRATORS SHALL NOT BE WORN
WHEN CONDITIONS PREVENT A GOOD
FACE TO FACEPIECE SEAL. SUCH CONDI-
TIONS MAY INCLUDE, BUT ARE NOT
LIMITED TO, GROWTH OF BEARDS, SIDE-
BURNS, A SKULL CAP THAT PROJECTS
UNDER THE FACEPIECE, OR TEMPLE
PIECES ON GLASSES. ALSO, THE AB-
SENCE OF ONE OR BOTH DENTURES CAN
SERIOUSLY EFFECT THE FIT OF THE
FACEPIECE. USE OF THE RESPIRATOR
WITHOUT A GOOD FACE TO FACEPIECE
SEAL MAY REDUCE THE DURATION OF
USE AND/OR EXPOSE THE USER TO THE
ATMOSPHERE THE RESPIRATOR IS IN-
TENDED TO PROTECT AGAINST WHICH
MAY RESULT IN SERIOUS INJURY OR
DEATH.
OPTIONS AND ACCESSORIES
In order to increase the utility of the respirator and/or to configure the
respirator for specific applications, the SCOTT AIR-PAK NxG2SCBA
may be equipped with one or more options and/or accessories. The
user of the respirator must determine which optional components are
installed on the particular respirator to be used and become thoroughly
familiar with their operation as explained in this instruction and in all
other instructions provided with this respirator. The user must also
identify any accessories installed on the SCOTT AIR-PAK NxG2SCBA
and consult the separate instruction manual provided with the acces-
sory for information on the operation and maintenance of that
accessory.
The SCOTT full facepiece used with the SCOTT AIR-PAK NxG2SCBA
is available in a variety of models and sizes. The organized respira-
tory protection program under which this respirator is to be used shall
provide for fit testing to determine the correct size facepiece for the
user of this respirator as well as the appropriate model facepiece for
the application. The user of this respirator must receive training in the
use of the respirator including, but not limited to, training in the pro-
cedure of donning the facepiece and checking the face to facepiece
seal before use of the respirator. See USE OF RESPIRATOR section
of this instruction.
When the use of corrective eye lenses are required during respirator
use, the corrective lenses must not interfere with a good seal between
the face and the facepiece. For example, spectacles with temple bars
or straps which pass between the face and the seal of the facepiece
must not be used. Each size facepiece may be equipped with a lens
kit if corrective spectacles are required.
Contact lenses will not interfere with the face to facepiece seal, how-
ever, only individuals who regularly use contact lenses without difficulty
should use contact lenses with a respirator. The use of contact lenses
may be restricted, may be limited to certain types of lenses or may
be forbidden by your respiratory protection program or by the regula-
tions under which your respiratory protection program operates. Notify
your respiratory protection director or your employer and obtain spe-
cific limitations and instructions before using contact lenses with a
SCOTT AIR-PAK NxG2SCBA.
The mask mounted breathing regulator may be supplied with a quick
disconnect fitting in the low pressure air hose leading to the regula-
tor. The quick disconnect permits disconnection of the breathing
regulator from the respirator without the use of tools. If the regulator
is equipped with a quick disconnect fitting, see step 7 of the REGU-
LAR OPERATIONAL INSPECTION section of this instruction and the
STANDBY INSPECTION, CLEANING AND STORAGE section of this
instruction for operation of the quick disconnect.
The respirator may be equipped with an integrated PASS DEVICE dis-
tress alarm which monitors the motion of a respirator user and emits
an audible signal when motion has ceased for a period of time. If the
respirator is equipped with a PASS DEVICE distress alarm see the
instructions provided with the PASS DEVICE accessory for details of
operation and maintenance. The SCOTT part number for the required
instructions appears on the PASS DEVICE label on the backframe.
In addition to the options explained above, the respirator may be sup-
plied with accessory components such as various electronic
communications devices
Consult with your SCOTT Health and Safety distributor for details of
available approved accessories for your SCOTT AIR-PAK NxG2. Re-
fer to the operation and maintenance instructions provided with these
and other optional components for details of the operation and main-
tenance of the option.

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APPROVALS AND CERTIFICATIONS
All models of the SCOTT AIR-PAK NxG2SCBA conform to the require-
ments of Title 42 Part 84 of the Code of Federal Regulations and are
certified by the National Institute of Occupational Safety and Health
(NIOSH) under the appropriate approval number for the respirator con-
figuration. See the complete NIOSH approval label, SCOTT document
P/N 10012360, included with these instructions. Also see the CAU-
TIONS AND LIMITATIONS SECTION and the SPECIFIC LIMITATIONS
SECTION of this instruction for the cautions and limitations which
apply to NIOSH certified respirators of this type.
The SCOTT AIR-PAK NxG2respirator is a modular design and is com-
posed of replaceable subassemblies. The SCOTT AIR-PAK NxG2
respirator may also include certain accessories. Each major subas-
sembly and accessory is labeled with its SCOTT part number. In order
to maintain the NIOSH approved status of the respirator, only those
subassemblies and/or accessories listed by part number as applicable
to a particular NIOSH approval number on the complete NIOSH ap-
proval label may be used in conjunction with the particular AIR-PAK
NxG2respirator approved under that approval number. The complete
NIOSH Approval Label, SCOTT document P/N 10012360, is included
with these instructions.
All models of the SCOTT AIR-PAK NxG2SCBA described in these in-
structions are certified by NIOSH for use in ambient temperatures down
to -25° F /-32° C. See LOW TEMPERATURE OPERATION section of
this instruction. To maintain NIOSH certification, AIR-PAK NxG2SCBA
cylinders must be refilled with compressed air which meets the require-
ments for Grade D or higher compressed air as specified in the
Compressed Gas Association publication CGA G-7.1 entitled Commod-
ity Specification for Air, available from the Compressed Gas Association,
Inc., 1725 Jefferson Davis Hwy., Suite 1004, Arlington, VA 22202. In
addition to meeting the requirements of Grade D or higher, the air must
be dry to a dew point of -65° F / -54° C or less. Special training is re-
quired to fill the cylinder and valve assemblies used with this SCOTT
AIR-PAK NxG2SCBA. Contact your SCOTT representative for addi-
tional information on refilling SCOTT SCBA cylinders.
In addition to meeting the requirements of NIOSH, the SCOTT AIR-PAK
NxG2SCBA meets the requirements of the National Fire Protection As-
sociation (NFPA) 1981 (Edition of 2002) Standard on Open-Circuit
Self-Contained Breathing Apparatus for the Fire Service when configured
in accordance with the NFPA approval. Due to the difference between
the NIOSH approval requirements and the NFPA Standard 1981, not all
subassemblies and/or accessories which are approved by NIOSH are
certified under the NFPA standard. Included with this instruction is the
NFPA Compliant Components Listing, SCOTT document P/N 89508-01,
which lists the major subassemblies and/or accessories which may be
used to configure a SCOTT respirator as compliant in accordance with
the requirements of NFPA Standard 1981. When compliance with NFPA
Standard 1981 is required, care must be taken during maintenance and
refurbishment of the respirator to install only subassemblies and/or ac-
cessories that are listed on SCOTT document P/N 89424-01 as
appropriate for use on a "certified model" SCOTT respirator. To main-
tain NFPA compliance, the SCOTT AIR-PAK NxG2SCBA must be used
only in accordance with NFPA standard 1500, entitled Standard on Fire
Department Occupational Safety and Health Program.

9
Specific combinations of respirator subassemblies may also qualify for
Chemical, Biological, Radiological, and Nuclear (CBRN) Approval Sta-
tus under the NIOSH standard. A complete list of the approved
components is provided on the NIOSH CBRN Approval Label, SCOTT
document P/N 595056-01. Before using a respirator for a CBRN appli-
cation, the user must verify that the respirator is comprised of only
CBRN approved components. An approved mask mounted breathing
regulator can be identified by its orange background label. An approved
backframe assembly can be identified by a CBRN sticker. However,
other components must be identified by individual part number as listed
on the NIOSH CBRN Approval Label, SCOTT document P/N 595056-
01. Certain facepieces, such as those with silicone face seals, are not
approved for CBRN applications. Regular Operational Inspection and
Use of a CBRN equipped SCOTT AIR-PAK NxG2SCBA are essentially
the same as for a standard SCOTT AIR-PAK NxG2SCBA. There may
be differences defined by the user’s respiratory protection program or
organization procedures for use in CBRN hazardous environments. It
is the responsibility of the respirator user's respiratory protection pro-
gram to properly identify and maintain respirator equipment for CBRN
applications.
• The attachment of components, accessories, or devices to the
SCOTT AIR-PAK NxG2SCBA which are not listed on the com-
plete NIOSH label may void the NIOSH approval and may degrade
the performance of the respirator.
• The attachment of components, accessories or devices not listed
on the NFPA listing, even if they are listed on the NIOSH approval
label, may void the NFPA certification and may degrade respirator
performance with respect to the NFPA certification requirements.
• The attachment of components, accessories or devices not
listed on the CBRN Approval Label, even if they are listed on
the NIOSH approval label or NFPA listing, may void the CBRN
approval and may degrade respirator performance with re-
spect to the CBRN approval requirements.
WARNING
ONLY THOSE RESPIRATOR COMPONENTS
APPROVED UNDER THE NIOSH CBRN STAN-
DARD MAY BE USED FOR A CBRN APPLICA-
TION. THE USE OF UNAUTHORIZED AND/OR
UNAPPROVED COMPONENTS OR ACCESSO-
RIES FOR A CBRN APPLICATION COULD
CAUSE PARTIAL OR COMPLETE FAILURE OF
THE RESPIRATOR WHICH MAY RESULT IN
SERIOUS INJURY OR DEATH.
INTRINSICALLY SAFE LISTING
The SCOTT AIR-PAK NxG2SCBA is listed by SGS U. S. TESTING
COMPANY, Inc. as intrinsically safe per ANSI/UL Std. UL-913 for use
in Class IDivision 1 Groups A, B, C, and D hazardous locations. To
maintain the Intrinsic Safety Listing, the respirator must be inspected
regularly per the following Regular Operational Inspection proce-
dures. Do not tamper with or substitute components in any manner.
Use only batteries of the type indicated in the Battery Replacement
instructions. Open the battery compartments only in an area known
to be free of flammable or explosive hazards.
WARNING – Substitution of Components May Impair Intrinsic Safety.
To reduce the risk of ignition of a flammable atmosphere, batteries
must only be changed in an area known to be nonflammable, and do
not mix old batteries with unused batteries, or mix batteries from dif-
ferent manufacturers.
WARNING
FAILURE TO REGULARLY INSPECT THE
RESPIRATOR, INCLUDING ALL ELEC-
TRONIC COMPONENTS, AS DESCRIBED IN
THIS INSTRUCTION OR FAILURE TO COR-
RECT DAMAGE TO THE ELECTRONIC
COMPONENTS, MAY IMPAIR THE INTRINSIC
SAFETY OF THE UNIT. THE INSTALLATION
OF INCORRECT BATTERIES OR SUBSTITU-
TION OF ANY OTHER COMPONENTS MAY
IMPAIR THE INTRINSIC SAFETY OF THE
UNIT. IF THE RESPIRATOR IS USED IN AN
EXPLOSIVE OR FLAMMABLE ATMO-
SPHERE, IMPAIRING THE INTRINSIC
SAFETY OF THE UNIT MAY LEAD TO A FIRE
OR AN EXPLOSION WHICH COULD RESULT
IN SERIOUS INJURY OR DEATH.

10
SERVICE LIFE
Each configuration of self-contained breathing apparatus (SCBA) cer-
tified by NIOSH is assigned a "service life" classification by NIOSH.
The "service life" classification is determined by a breathing machine
test conducted by NIOSH. The tests are conducted on a breathing
machine which is designed to simulate an average adult user perform-
ing work at a "moderate work rate" as defined by NIOSH.
The user should not expect to obtain the NIOSH rated service life
from this respirator on each use. The work being performed may be
more or less strenuous than that used in the NIOSH test. Where
work is more strenuous, the duration may be less than one half the
NIOSH rated service time. Likewise, the time remaining after any end
of service indicator alarm actuates may be similarly reduced. The
end of service indicator alarms actuate when approximately 25% of
full cylinder pressure remains in the cylinder and valve assembly.
The VIBRALERT will continue to operate until the cylinder is nearly
depleted. The HEADS-UP DISPLAY end of service time indicator
will continue to operate until it is manually turned off.
The duration of the respirator will depend on such factors as:
1. the degree of physical activity of the user;
2. the physical condition of the user;
3. the degree to which the user’s breathing is affected by excitement,
fear or other emotional factors;
4. the degree of training or experience which the user has with this
or similar equipment;
5. whether or not the cylinder is fully charged at the start of the work
period;
6. the possible presence in the compressed air of carbon dioxide con-
centrations greater than .04% normally found in atmospheric air;
7. the atmospheric pressure; for example, if used in a pressurized
tunnel or caisson at 2 atmospheres (15 psi gauge or approximately
30 psi absolute) the duration will be one-half as long as when used
at 1 atmosphere; and at 3 atmospheres will be one-third as long;
8. loose or improperly fitting facepiece;
9. the condition of the respirator.
WARNING
ONLY THOSE RESPIRATOR COMPONENTS
APPROVED UNDER THE NIOSH CBRN STAN-
DARD MAY BE USED FOR A CBRN APPLICA-
TION. THE USE OF UNAUTHORIZED AND/OR
UNAPPROVED COMPONENTS OR ACCESSO-
RIES FOR A CBRN APPLICATION COULD
CAUSE PARTIAL OR COMPLETE FAILURE OF
THE RESPIRATOR WHICH MAY RESULT IN
SERIOUS INJURY OR DEATH.
QUESTIONS OR CONCERNS
If you have any questions or concerns regarding use of this equipment,
contact your authorized SCOTT dealer or distributor, or contact SCOTT
at 1-800-247-7257 (or 704-291-8300 outside the continental United
States) or visit our web site at www.scotthealthsafety.com.

11
HEADS-UP DISPLAY OPERATION
The HEADS-UP DISPLAY provides a visual monitor of the air supply in
the cylinder and valve assembly. The display is fitted to the facepiece
mounted regulator and appears across the bottom of the user's field of
view through the facepiece. The HEADS-UP DISPLAY consists of four
rectangular lights to represent the cylinder pressure at FULL, THREE-
QUARTERS, ONE-HALF, and ONE-QUARTER. A fifth round red light
indicates LOW BATTERY. The HEADS-UP DISPLAY operates as follows:
1. When respirator use begins, the HEADS-UP DISPLAY will initial-
ize and display either one (1) red light for 2216 psi system or one
(1) green light for a 4500 psi system. If the installed cylinder pres-
sure is above 200 psi, this will be followed by the illumination of
all five lights for twenty (20) seconds. Operation of all five lights
must be verified every time respirator use is begun and with ev-
ery REGULAR OPERATIONAL INSPECTION.
2. After initialization, the rectangular indicator lights will show the
level of the air supply in the cylinder as follows:
a) FULL cylinder is indicated by the two green lights glowing near
the center of the display.
b) THREE-QUARTERS cylinder is indicated by a single green
light glowing.
c) ONE-HALF cylinder is indicated by the yellow light flashing
slowly at once a second.
d) ONE-QUARTER cylinder end of service time indicator is indi-
cated by the red light at the far left flashing rapidly at ten times
a second. WHEN THIS WARNING LIGHT IS FLASHING RAP-
IDLY, THE USER MUST LEAVE THE HAZARDOUS ATMO-
SPHERE IMMEDIATELY.
3. When the batteries require changing, the round LOW BATTERY
indicator at the far right of the display will light for twenty (20)
seconds and then begin to flash slowly at once a second. When
the LOW BATTERY indicator is actuated, the batteries still have
sufficient life to operate the HEADS-UP DISPLAY longer than the
longest duration cylinder installed on the respirator. However, the
batteries must be changed immediately upon termination of use
of the respirator, or before reentry into a hazardous atmosphere.
See the BATTERY REPLACEMENT section of this instruction.
WARNING
THE RESPIRATOR USER MUST IMMEDI-
ATELY LEAVE THE AREA REQUIRING RES-
PIRATORY PROTECTION WHEN AN END OF
SERVICE INDICATOR ALARM ACTUATES.
ACTUATION OF ANY END OF SERVICE IN-
DICATOR ALARM WARNS THAT APPROXI-
MATELY 25% OF FULL PRESSURE RE-
MAINS IN THE AIR SUPPLY CYLINDER
(THAT IS, APPROXIMATELY 3/4 OF THE
TOTAL AIR SUPPLY HAS BEEN USED) OR
THAT THERE IS A MALFUNCTION IN THE
RESPIRATOR. A DELAY IN LEAVING THE
AREA AFTER ALARM ACTUATION MAY RE-
SULT IN SERIOUS INJURY OR DEATH.
WHAT THEY MEANINDICATOR LIGHTS WHAT YOU SHOULD DO
TWO LIGHTS GLOWING
ONE LIGHT GLOWING
ONE LIGHT FLASHING SLOWLY
ONE LIGHT FLASHING RAPIDLY
FULL CYLINDER
3/4 CYLINDER
1/2 CYLINDER
1/4 CYLINDER
CONTINUE USING RESPIRATOR
LEAVE HAZARDOUS AREA IMMEDIATELY
HEADS-UP DISPLAY QUICK GUIDE
FIGURE 1
HEADS-UP DISPLAY
FULL GREEN
LIGHT
3/4 GREEN
LIGHT
1/2 YELLOW
LIGHT
(FLASHING
SLOWLY)
1/4 RED
LIGHT
(FLASHING
RAPIDLY)
LOW BATTERY
WARNING

12
REGULAR OPERATIONAL INSPECTION
The following procedure shall be used when you first receive the res-
pirator and for daily or periodic inspection of the respirator.
Respirators in regular use must be inspected at the start of each use
period and during cleaning after each use. Respirators maintained for
emergency use must be inspected at least monthly or as frequently
as required to assure the respirator will function properly when re-
quired. The US Labor Department (OSHA) requires, pursuant to 29
CFR 1910.134, at least monthly inspection of respirators maintained
for emergency use. NIOSH recommends an inspection for cylinder
pressure at least weekly.
The condition of storage at your location or the regulations which ap-
ply to your respiratory protection program may require more frequent
periodic inspections.
All respirators shall be inspected after each use. If any discrepancy
or malfunction is noted during the inspection, do not use the respira-
tor. Remove the respirator from service and tag it for repair by
authorized personnel.
Refer to the OPERATION AND MAINTENANCE INSTRUCTIONS for
the PASS DEVICE distress alarm installed on this respirator for addi-
tional inspection procedures. The required instructions are identified
by part number on the PASS DEVICE distress alarm label located on
the respirator backframe.
1. Visually inspect the complete respirator for worn or aging rubber
parts which exhibit cracking, splitting, or brittleness. Also inspect
for worn or frayed harness webbing and for other damaged com-
ponents.
2. Check the latest cylinder hydrostatic test date to ensure it is cur-
rent. All cylinders used with SCOTT AIR-PAK NxG2SCBA's must
be visually inspected regularly and hydrostatically tested by a li-
censed cylinder re-tester in accordance with the appropriate US
Department of Transportation (DOT) specification or the applicable
DOT exemption. For a complete listing of retest date requirements,
refer to the current revision of Safety Precautions for AIR-PAK Cyl-
inders, SCOTT P/N 89080-01, available on request from SCOTT
Health and Safety. Composite cylinders (those cylinders utilizing
fiber over wrap) must be tested in accordance with the DOT ex-
emption status up to the maximum life of fiber overwrapped cyl-
inders which, at the time of the publication of this instruction, is
15 years from the date of manufacture. The date of manufacture
marked on the cylinder is also the date of the first hydrostatic test.
It is the responsibility of your organized respiratory protection pro-
gram to arrange for visual inspection and hydrostatic testing of
cylinders by a licensed re-tester.
3. Visually inspect cylinder and valve assembly for physical damage
such as dents or gouges in metal or in composite wrapping. Cyl-
inders which show physical damage or exposure to high heat or
flame, such as paint turned brown or black, decals charred or
missing, pressure gauge lens melted or elastomeric bumper dis-
torted, and cylinders which show evidence of exposure to chemi-
cals such as discoloration, cracks in the cylinder or the composite
wrapping, peeling of the outer layers of the composite wrapping
and/or bulging of the cylinder wall, shall be removed from service
WARNING
THE INFORMATION BELOW IS MEANT TO SUPPLEMENT, NOT REPLACE, THE INSTRUCTIONS,
TRAINING, SUPERVISION, MAINTENANCE, AND OTHER ELEMENTS OF YOUR ORGANIZED RESPI-
RATORY PROTECTION PROGRAM. SEE WARNING ON THIRD PAGE OF THIS DOCUMENT. FAILURE
TO HEED ANY WARNINGS IN THIS INSTRUCTION MAY RESULT IN SERIOUS INJURY OR DEATH.
WARNING
FOLLOW THE REGULAR OPERATIONAL IN-
SPECTION PROCEDURE EXACTLY. IF THE
END OF SERVICE INDICATOR ALARMS DO
NOT ACTUATE AS DESCRIBED IN THIS IN-
STRUCTION, THE PURGE DOES NOT
ACTUATE AS DESCRIBED IN THIS IN-
STRUCTION OR ANY OTHER OPERATIONAL
MALFUNCTION IS NOTED, DO NOT USE
THE RESPIRATOR. REMOVE THE RESPIRA-
TOR FROM SERVICE AND TAG IT FOR
REPAIR BY AUTHORIZED PERSONNEL.
FAILURE TO PROPERLY IDENTIFY MAL-
FUNCTIONS MAY RESULT IN SERIOUS
INJURY OR DEATH.
WARNING
DAMAGED CYLINDERS MAY SUDDENLY
LEAK OR RUPTURE IF LEFT CHARGED
WITH COMPRESSED AIR. FAILURE TO IN-
SPECT FOR DAMAGE AND TO EMPTY THE
AIR FROM DAMAGED CYLINDERS MAY RE-
SULT IN SERIOUS INJURY OR DEATH.

13
and emptied of compressed air. Refer to current applicable pub-
lications on compressed gas cylinder inspection available from
Compressed Gas Association Inc., 1725 Jefferson Davis Hwy.,
Suite 1004, Arlington, VA 22202, (703-412-0900) for a detailed ex-
planation of cylinder inspection procedures.
4. Check cylinder pressure gauge for “FULL” indication. If cylin-
der pressure is less than “FULL,” replace with a fully charged
cylinder.
5. Check to ensure reducer coupling is secure to the cylinder valve
outlet.
6. Check that the breathing regulator purge valve (red knob on regu-
lator) is closed (full clockwise and pointer on knob upward).
7. If the hose to the breathing regulator is equipped with a quick dis-
connect (See STANDBY INSPECTION, CLEANING AND STOR-
AGE Section for instruction on operation of the quick disconnect
coupling on regulator assemblies), check that the quick discon-
nect is engaged properly by tugging on the coupling. The Pull-back
Sleeve Quick Disconnect is shown in FIGURE 2.
8. Fully depress the center of the air saver/donning switch on the
top of the regulator and release.
9. Slowly open the cylinder valve by fully rotating knob counterclock-
wise. VIBRALERT alarm shall actuate and then stop. The HEADS-
UP DISPLAY will initialize with all five lights on for twenty seconds
followed by display of cylinder supply level. If the LOW BATTERY
light at the far right of the display remains lit or begins to flash,
replace the battery according to the BATTERY REPLACEMENT
section of this instruction before proceeding.
If the respirator is equipped with the PASS DEVICE distress alarm,
the distress alarm will be actuated when the cylinder valve is
opened. Refer to operating and maintenance instructions of the
PASS DEVICE distress alarm for the operational inspection of the
PASS DEVICE distress alarm.
10. Don the facepiece or hold the facepiece to the face to effect a
good seal. Inhale sharply to automatically start the flow of air.
Breathe normally from the facepiece to ensure proper operation.
11. Remove facepiece from face. Air shall freely flow from the face-
piece.
12. Fully depress the center of the air saver/donning switch on the
top of regulator and release. The flow of air from the facepiece
shall stop. Examine the complete respirator for air leaks. There
shall be no leakage of air from any part of the respirator.
13. Rotate purge valve 1/2 turn counterclockwise (pointer on knob
downward). Air shall freely flow from the regulator.
14. Rotate purge valve 1/2 turn clockwise to full closed position
(pointer on knob upward). Air flow from regulator shall stop.
WARNING
FAILURE TO CHECK ENGAGEMENT OF THE
COUPLING AS DESCRIBED MAY LEAD TO
HOSE SEPARATION AND LOSS OF BREATH-
ING AIR RESULTING IN SERIOUS INJURY
OR DEATH.
REGULAR OPERATIONAL INSPECTION
CONTINUED ON NEXT PAGE...
FIGURE 2
PULL-BACK SLEEVE QUICK DISCONNECT
CAUTION
DO NOT USE TOOLS TO OPEN OR CLOSE
THE PURGE VALVE. OPEN OR CLOSE BY
USING FINGER-PRESSURE ONLY. ROTA-
TION OR THE PURGE VALVE IS LIMITED TO
1/2 TURN. USE OF TOOLS TO OPEN OR
CLOSE PURGE VALVE MAY RESULT IN
DAMAGE TO THE PURGE VALVE.

14
15. Push in and rotate cylinder valve knob clockwise to close. When
cylinder valve is fully closed, open purge valve slightly to vent re-
sidual air pressure from system. As the residual air pressure vents
from the system, the remote pressure gauge needle will swing
from “FULL” and move towards “EMPTY.” Observe the lights of
the HEADS-UP DISPLAY and verify that they light properly in de-
scending order. Close the purge valve when the gauge needle
crosses the “¼” mark but before the beginning of the red “EMPTY”
band (see FIGURE 4).
The VIBRALERT end of service indicator alarm shall actuate. The
red light on the far left of the HEADS-UP DISPLAY shall flash rap-
idly at ten (10) times per second. After verifying that all alarms
are functioning (rapid clicking of the VIBRALERT Alarm and rapid
flashing of the HEADS-UP DISPLAY red light) open the purge
valve slightly to vent the remaining residual air pressure from the
system. All alarms shall cease operation when the system pres-
sure drops to zero. When air flow stops completely, return purge
valve to the fully closed position (pointer on knob upward).
FIGURE 3
REMOTE GAUGE
TO TEST ALARMS,
CONTROL NEEDLE
BETWEEN 1/4 AND
TOP OF "EMPTY" WARNING
IF ANY END OF SERVICE INDICATOR
ALARM DOES NOT ACTUATE AS DE-
SCRIBED IN THIS INSTRUCTION, DO NOT
USE THE RESPIRATOR. REMOVE THE RES-
PIRATOR FROM SERVICE AND TAG IT FOR
REPAIR BY AUTHORIZED PERSONNEL.
USE OF AN IMPROPERLY OPERATING END
OF SERVICE INDICATOR MAY RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
AIR LEAKAGE MAY REDUCE THE DURA-
TION OF USE AND/OR THE TIME
REMAINING AFTER AN END OF SERVICE
ALARM ACTUATES OR MAY PREVENT AN
END OF SERVICE ALARM FROM ACTUAT-
ING. THE USE OF A RESPIRATOR
EXHIBITING AN AIR LEAK MAY RESULT IN
SUDDEN TERMINATION OF THE AIR SUP-
PLY WHICH COULD RESULT IN SERIOUS
INJURY OR DEATH.
REGULAR OPERATIONAL INSPECTION CONTINUED...

15
BATTERY TEST
On respirators equipped with a PASS DEVICE distress alarm, the battery
condition can be tested manually as follows:
1. Make sure the PASS DEVICE distress alarm is in the off condi-
tion (cylinder valve closed with no flashing green lights)
2. Press and hold the RESET button on the console. Observe the
FINAL light color in the sequence to determine the status.
NOTE
THE BACKFRAME LIGHTS WILL DISPLAY A BRIGHT LIGHT FOL-
LOWED BY THE FINAL STATUS COLOR.
a) GREEN lights illuminated on the control console and
backframe lights indicate sufficient battery power remaining
b) RED lights on the control console and backframe lights indi-
cate that the batteries are low must be replaced before the
respirator is to be used again. See BATTERY REPLACEMENT
section of these instructions.
If a low battery message occurs, SCOTT recommends that ALL batteries
be changed before the respirator is used. See the BATTERY REPLACE-
MENT section of this instruction for details.
If the respirator is equipped with an integrated PASS device, verify that
the Backframe Lights are operating as described below:
When performing the REGULAR OPERATIONAL INSPECTION, verify that
the Backframe Lights are operating as described below:
OPERATION OF BACKFRAME LIGHTS
NOTE
THE ORANGE LIGHT IS A COMBINATION OF THE RED, GREEN,
AND WHITE LIGHTS THAT APPEARS ORANGE FROM A DISTANCE.
AT CLOSE RANGE THE INDIVIDUAL LIGHTS MAY BE VISIBLE.
ACTION... BACKFRAME LIGHTS WILL…
Normal Operation .......................................................... Flash GREEN
Install Cylinder ............................................................... Flash BLUE
Remove Cylinder ........................................................... Flash RED
Respirator Low air (1/4 cylinder) ................................. Flash ORANGE (alternately)
Low Battery while ON ................................................... Flash ORANGE once a second
Shut down ....................................................................... Lights OFF
Press RESET w/unit OFF (BATTERY TEST)........... Bright Light then:
Flash GREEN if Good/Flash RED if Low
Press MANUAL ALARM with unit OFF ...................... Flash GREEN then Full Alarm Flash RED
Press RESET from manual alarm .............................. Returns to Flash GREEN
Start up PASS device ................................................... Bright Light then Flash GREEN
PASS Pre-Alarm............................................................ Flash RED (alternately)
PASS Full alarm............................................................ Flash RED (simultaneously)
ACTION... BACKFRAME LIGHTS WILL…

16
WARNING
USE OF THE RESPIRATOR WITHOUT FAS-
TENING AND ADJUSTING THE SHOULDER
STRAPS AND THE WAIST BELT AND SE-
CURING LOOSE ENDS OF BELT AS
DESCRIBED IN THIS INSTRUCTION MAY
RESULT IN SHIFTING OF THE RESPIRATOR
ON THE USER'S BODY, SNAGGING THE
BELT, OR IN SEPARATION OF THE RESPI-
RATOR FROM THE USER'S BODY WHICH
COULD DISTURB THE FACE TO FACEPIECE
SEAL AND WHICH MAY RESULT IN EXPO-
SURE OF THE USER TO THE ATMOSPHERE
THE RESPIRATOR IS INTENDED TO PRO-
TECT AGAINST RESULTING IN SERIOUS
INJURY OR DEATH.
WARNING
IF PASS DEVICE DISTRESS ALARM FAILS
TO FUNCTION IN ACCORDANCE WITH THE
INSTRUCTIONS SUPPLIED WITH THE DIS-
TRESS ALARM, DO NOT USE THE
RESPIRATOR. REMOVE IT FROM SERVICE
AND TAG FOR REPAIR BY AUTHORIZED
PERSONNEL. USE OF A RESPIRATOR WITH
A MALFUNCTIONING DISTRESS ALARM
MAY RESULT IN SERIOUS INJURY OR
DEATH.
WARNING
IF THE END OF SERVICE INDICATOR
ALARMS DO NOT ACTUATE AS DESCRIBED
IN THIS INSTRUCTION, DO NOT USE THE
RESPIRATOR. REMOVE THE RESPIRATOR
FROM SERVICE AND TAG IT FOR REPAIR
BY AUTHORIZED PERSONNEL. USE OF A
RESPIRATOR WITH A MALFUNCTIONING
END OF SERVICE INDICATOR MAY RESULT
IN SERIOUS INJURY OR DEATH.
WARNING
THE CYLINDER VALVE MUST BE FULLY
OPENED FOR PROPER OPERATION OF
THE RESPIRATOR. USE OF A RESPIRATOR
WITH THE CYLINDER VALVE PARTIALLY
OPENED MAY CAUSE A REDUCTION OF
THE AIR SUPPLIED TO THE USER AND/OR
A SUDDEN AND COMPLETE LOSS OF AIR
SUPPLIED TO THE USER. A REDUCTION
OR LOSS OF AIR TO THE USER MAY RE-
SULT IN SERIOUS INJURY OR DEATH.
PREPARATION FOR USE
1. If carrying case is used for storage, proceed as follows:
Place carrying case on ground or level surface, open lid (hard case) or
top flap (soft case). Check cylinder gauge for “FULL” indication. If not
full, replace cylinder before use. A gauge indication of other than full
may indicate an air leak in the cylinder and valve assembly or a mal-
function of the gauge assembly. Ensure that the cylinder is firmly locked
in position by the cylinder retention assembly. Stand the respirator on
the cylinder valve with cylinder toward you and the shoulder straps
away from you. Grasp both shoulder straps by the top, one in each
hand. Pick up the respirator and swing it around behind you. Re-
lease your grasp while sliding your arms under the shoulder straps.
Ensure that the shoulder straps fall into place on the shoulders. Pull
down on the side straps to adjust the harness to fit your body.
If storage bracket is used, proceed as follows:
Check the cylinder gauge for “FULL” indication. If not full, replace
cylinder before use. A gauge indication of other than full may in-
dicate an air leak in the cylinder and valve assembly or a mal-
function of the gauge assembly. Ensure that the cylinder is firmly
locked in position by the cylinder retention assembly. Follow the
instructions of the bracket manufacturer for placing arms through
shoulder straps and freeing the respirator from the bracket.
2. Connect the waist belt buckle and adjust by pulling forward on the
two (2) side-mounted belt ends. Tuck belt ends into waistband.
3. Readjust shoulder straps to ensure the weight is carried on the
hips. Tuck in ends of shoulder straps.
4. Fully depress center of the air saver/donning switch on top of regu-
lator and release. The regulator may be, but does not have to be,
installed in the facepiece at this time (see step 6 below).
5. Slowly open cylinder valve fully by turning the valve knob coun-
terclockwise until it stops (approximately 2 1/2 full turns of the
knob). The VIBRALERT end of service indicator alarm will actu-
ate and then stop. The HEADS-UP DISPLAY shall initialize for
twenty (20) seconds and then display the cylinder level.
The respirator is equipped with a PASS DEVICE distress alarm
which will actuate when the cylinder valve is opened and will sound
three quick audible chirps accompanied by a green flashing on the
PASS DEVICE control console. Refer to the operating and main-
tenance instructions for PASS DEVICE distress alarm for complete
information on the distress alarm operation.
If the air saver/donning switch has not been depressed prior to
opening the cylinder valve, the VIBRALERT Alarm will not actu-
ate due to the air flowing freely on the facepiece.
6. The user of the respirator is now in “standby” condition. The res-
pirator is in place on the user's body but the facepiece is not
donned (sealed to the face) and the respirator is not being used.
The regulator is retained in the facepiece by a 1/4 turn port and
is locked in the facepiece retainer with a lock tab. To detach the
regulator from the facepiece while in “standby” condition, place
your right hand over the cover with your thumb on the lock tab.
Pull the lock tab toward the cover and rotate the regulator 1/4 turn
clockwise (viewed from inside of facepiece). When the red purge
valve is in the 12 o’clock position remove regulator from the face-
piece. An optional regulator holder which attaches to the user’s
belt and a facepiece neck strap are available for use during
“standby” condition. See the ACCESSORIES section of this in-
struction.

17
WARNING
FAILURE TO DON THE FACEPIECE AND/OR
FAILURE TO ADJUST THE HEAD HARNESS
AS DESCRIBED IN THIS INSTRUCTION MAY
RESULT IN A POOR FACE TO FACEPIECE
SEAL OR MAY RESULT IN THE FAILURE OF
THE FACE TO FACEPIECE SEAL DURING
USE. A POOR OR FAILED FACE TO FACE-
PIECE SEAL MAY REDUCE THE DURATION
OF USE OF THE RESPIRATOR AND/OR EX-
POSE THE USER TO THE HAZARDOUS
ATMOSPHERE WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
FIT TESTING IN ACCORDANCE WITH OSHA
STANDARD 29 CFR PART 1910 IS RE-
QUIRED AS PART OF THE REQUIRED
TRAINING BEFORE USE OF THIS RESPIRA-
TOR. FAILURE TO PROPERLY FIT AND
TRAIN THE USER IN USE OF THE FACE-
PIECE AND RESPIRATOR MAY RESULT IN
EXPOSURE TO THE HAZARDOUS ATMO-
SPHERE WHICH COULD LEAD TO SERIOUS
INJURY OR DEATH.
USE OF RESPIRATOR
Training and fit testing are required before use of this equipment.
If respirator use is expected at temperatures near or below freezing,
or if respirator is to be used after being kept at temperatures near or
below freezing, refer to LOW TEMPERATURE OPERATION Section
for additional information and supplemental procedures.
If regulator is not attached to facepiece, be sure the regulator gasket is in
place around the outlet port of the regulator and not damaged. With the
red purge valve in the 12 o’clock position, align the two flats of the outlet
port with corresponding flats in the facepiece port and insert. Rotate the
regulator counterclockwise (viewed from inside of facepiece) so that the
red purge valve knob is situated on the left side of the facepiece. The lock
tab on the mask-mounted regulator will lock into the facepiece retainer
with a “click.” If properly engaged, the regulator will not rotate.
To begin use of respirator, don the facepiece (i.e., place facepiece
on face and obtain a proper seal) as follows:
1. Examine the facepiece assembly to be certain the nose cup in-
halation valves are installed, the nose cup is correctly positioned
inside the face seal chin cup, and nose cup is properly seated be-
tween the flanges of the voicemitter ducts. See FIGURES 9 and
10 in the STANDBY INSPECTION, CLEANING AND STORAGE
section of this instruction.
2. Adjust the head straps to the full outward position.
3. Hold the head harness out of the way with one hand while plac-
ing the facepiece on the face with the other hand.
NOTE
ENSURE THAT THE CHIN IS PROPERLY LOCATED IN THE CHIN
POCKET OF THE FACEPIECE.
4. Pull the head harness over the head and ensure that straps are
lying flat against the head and neck with no twists.
NOTE
IF THE FACEPIECE IS EQUIPPED WITH A RUBBER HEAD HAR-
NESS, POSITION THE TOP CENTER PORTION OVER THE CROWN
OF THE HEAD. MAINTAIN THE HEAD HARNESS IN THIS POSITION
WHILE TIGHTENING THE STRAPS.
5. Tighten the neck straps by pulling the two lower strap ends to-
ward the rear of the head.
6. Verify that the head harness is lying flat against the back of the
head using one or both hands. Retighten neck straps.
7. Adjust the temple straps by pulling the two upper strap ends to-
ward the rear of the head. Use caution pulling temple straps as
overtightening may cause discomfort.
8. Retighten the neck straps if required. On subsequent use by the
same wearer, release and retightening of the temple straps may
not be required.
9. With facepiece sealed to face, inhale sharply to actuate respira-
tor. Air will then be supplied during inhalation.
NOTE
IF AIR IS NOT SUPPLIED ON FIRST INHALATION, CHECK THAT
CYLINDER VALVE IS FULLY OPEN, REMOTE GAUGE INDICATES
PRESSURE IN CYLINDER, AND FACEPIECE IS SEALED TO FACE.
USE OF THE RESPIRATOR
CONTINUED ON NEXT PAGE...

18
WARNING
IF LEAKAGE OF AIR INTO THE FACEPIECE
IS DETECTED DURING CHECK OF THE
FACE TO FACEPIECE SEAL, DO NOT USE
THE RESPIRATOR. REMOVE FACEPIECE
AND REPEAT THE DONNING PROCEDURE.
IF FACEPIECE CANNOT BE ADJUSTED TO
SEAL TO FACE, A FACEPIECE FIT TEST
AND/OR A DIFFERENT SIZE FACEPIECE
MAY BE REQUIRED BEFORE USE OF THE
RESPIRATOR. USE OF A RESPIRATOR
WITH A POORLY FITTING FACEPIECE MAY
EXPOSE THE USER TO THE HAZARDOUS
ATMOSPHERE AND RESULT IN SERIOUS
INJURY OR DEATH.
WARNING
CHECK THE FACE TO FACEPIECE SEAL
BEFORE USE. A POOR FACE TO FACE-
PIECE SEAL MAY RESULT IN LOSS OF AIR
WHICH MAY CAUSE REDUCED DURATION
OF USE AND/OR EXPOSURE OF THE USER
TO THE HAZARDOUS ATMOSPHERE WHICH
COULD CAUSE SERIOUS INJURY OR
DEATH.
10. Check face to facepiece seal and end of service indicator alarm op-
eration by pushing in on the cylinder valve and rotating it clockwise to
completely close it. Breathe on respirator. As the air pressure falls in
the respirator, one of the end of service indicator alarms will actuate.
Immediately on actuation of an end of service indicator alarm, hold
breath momentarily and make certain that the VIBRALERT and
HEADS-UP DISPLAY both actuate (rapid clicking of the VIBRALERT
Alarm, rapid flashing of the HEADS-UP DISPLAY red light). Resume
breathing on the respirator until all air stops flowing from the breath-
ing regulator. Inhale slowly and hold breath momentarily. No leakage
of air shall be detected into the facepiece and the facepiece shall be
drawn slightly to the face. Open cylinder valve and breathe normally.
If the environment is suitably quiet, leakage from the facepiece
can also be detected by listening for a flow of air while holding
your breath. Inhale and hold your breath momentarily after don-
ning the facepiece. Do not depress air saver/donning switch. Air
should not be heard flowing into the facepiece from the regulator
and no flow of air shall be detected outward from the facepiece.
If leakage of air is detected during either of the above procedures,
depress the air saver/donning switch on the top of the regulator, doff
the facepiece and repeat donning steps 1 through 8 above. If a user
seal check is unsatisfactory either per the user instructions above
or the OSHA fit testing process, the use of Mask Seal Kit P/N
805655-01 is required. The Mask Seal Kit is provided with the full
facepiece. Refer to the INSTALLATION AND USE INSTRUCTIONS,
SCOTT P/N 89462-01, included with the Mask Seal Kit. This is a
NIOSH approved kit to enhance the fit of the facepiece.
If leakage persists, do not use the respirator.
11. Put on, or replace, helmet or other required protective head gear and
put on or properly position and close any required protective cloth-
ing such as turn out gear. The user of the respirator must make
certain that any protective head gear, helmet or protective clothing
does not interfere with the use of the respirator and that the head
can move freely without dislodging the facepiece or disturbing the
face to facepiece seal. See ANSI Standard Z88.2 entitled Practices
for Respiratory Protection for additional information. When the res-
pirator is used in conjunction with fire fighting, see NFPA Standard
1500, entitled Standard on Fire Department Occupational Safety and
Health Program for additional information.
NOTE
DO NOT ATTACH ANYTHING TO, OR CARRY ANYTHING ON, THE
AIR-PAK NXG2SCBA SHOULDER STRAP BUCKLES AS THIS
COULD CAUSE THE SHOULDER STRAPS TO LOOSEN DURING
USE OF THE RESPIRATOR.
WARNING
IF THE END OF SERVICE INDICATOR
ALARMS DO NOT ACTUATE AS DESCRIBED
IN THIS INSTRUCTION, DO NOT USE THE
RESPIRATOR. REMOVE THE RESPIRATOR
FROM SERVICE AND TAG IT FOR REPAIR
BY AUTHORIZED PERSONNEL. USE OF A
RESPIRATOR WITH A MALFUNCTIONING
END OF SERVICE INDICATOR MAY RESULT
IN SERIOUS INJURY OR DEATH.
USE OF RESPIRATOR CONTINUED...

19
WARNING
THE RESPIRATOR USER MUST IMMEDI-
ATELY LEAVE THE AREA REQUIRING
RESPIRATORY PROTECTION WHEN AN END
OF SERVICE INDICATOR ALARM ACTU-
ATES. ACTUATION OF ANY END OF
SERVICE INDICATOR ALARM WARNS THE
USER THAT APPROXIMATELY 25% OF FULL
PRESSURE REMAINS IN THE AIR SUPPLY
CYLINDER (THAT IS, APPROXIMATELY 3/4
OF THE TOTAL AIR SUPPLY HAS BEEN
USED) OR THAT THERE IS A MALFUNCTION
IN THE RESPIRATOR. A DELAY IN LEAVING
THE AREA AFTER ALARM ACTUATION MAY
RESULT IN SERIOUS INJURY OR DEATH.
WARNING
ALWAYS START WITH A FULL AIR SUPPLY
CYLINDER. PARTIALLY FILLED CYLIN-
DERS SHOULD ONLY BE USED IN
EMERGENCY CONDITIONS IF FULL CYLIN-
DERS ARE NOT AVAILABLE. BEFORE
ENTERING A POTENTIALLY HAZARDOUS
ATMOSPHERE, THE USER MUST DETER-
MINE THAT THE CYLINDER CONTAINS
SUFFICIENT AIR TO ALLOW TIME FOR
COMPLETION OF THE TASK INVOLVED
AND RETURN TO A SAFE ATMOSPHERE
WITH AN ADEQUATE MARGIN FOR
SAFETY. ENTERING A HAZARDOUS ATMO-
SPHERE WITH INSUFFICIENT AIR OR
AFTER THE END OF SERVICE TIME INDI-
CATOR HAS ACTUATED MAY RESULT IN
SERIOUS INJURY OR DEATH.
12. Proceed with use of respirator in accordance with your respira-
tory protection program.
EVERY ENTRY INTO A CONTAMINATED OR UNKNOWN ATMO-
SPHERE SHOULD BE PLANNED TO ENSURE THAT THERE IS
SUFFICIENT AIR SUPPLY TO ENTER, CARRY OUT THE TASKS
REQUIRED AND RETURN TO A SAFE BREATHING AREA. THE
USER SHOULD CHECK THE REMOTE READING PRESSURE
GAUGE ON THE SHOULDER STRAP PERIODICALLY TO DETER-
MINE THE RATE OF AIR CONSUMPTION. IN ANY EVENT, THE
USER MUST BE CERTAIN TO ALLOW SUFFICIENT AIR FOR
EGRESS FROM THE CONTAMINATED AREA. IF ENTRY IS AT-
TEMPTED AFTER THE AIR HAS BEEN PARTIALLY CONSUMED
(CYLINDER LESS THAN FULL), THE USER MUST BE CERTAIN
THAT THE REMAINING AIR WILL BE SUFFICIENT FOR SAFETY.
If either end of service indicator alarm, the VIBRALERT alarm or the
HEADS-UP DISPLAY actuates either individually or together, leave
the area requiring respiratory protection immediately. When in a safe
area where you are certain that respiratory protection is not required,
terminate the use of the respirator, (see TERMINATION OF USE sec-
tion of this instruction) and determine the cause of the alarm. Where
the cause of the alarm activation is determined to be a depleted air
supply cylinder, replace the cylinder in accordance with the CYLIN-
DER REPLACEMENT PROCEDURE section of this instruction. Do
not resume the use of a respirator where any end of service indica-
tor alarm has actuated for an unknown reason. Remove such a res-
pirator from service and tag it for repair by authorized personnel.
LOW BATTERY
As the batteries begin to approach the end of their useful life, the low battery
condition will be signified by the following:
1. The backframe module will begin to sound a chirp approximately
every two seconds.
2. The round LOW BATTERY indicator at the far right of the HEADS-
UP display will light for twenty (20) seconds and then begin to flash
slowly at once a second.
3. If the respirator is equipped with a PASS DEVICE distress alarm,
the green lights on the control module and backframe will go out.
While in low battery condition, the HEADS-UP display and the PASS DE-
VICE distress alarm will continue to operate for a period of time greater then
the longest duration cylinder available for the respirator. However, the batter-
ies must be replaced before the respirator is used again. See BATTERY
REPLACEMENT section of these instructions.
WARNING
FAILURE TO REPLACE THE BATTERIES AND/
OR CONTINUING WITH MULTIPLE USES OF
THE RESPIRATOR AFTER THE LOW BAT-
TERY CONDITION HAS BEEN INDICATED BY
THE PASS DEVICE DISTRESS ALARM MAY
RESULT IN FAILURE OF THE PASS DEVICE
DISTRESS ALARM DURING USE AND POS-
SIBLE INJURY OR DEATH OF THE USER.

20
CAUTION
FAILURE TO RELEASE TENSION ON
SHOULDER STRAPS BEFORE REMOVING
RESPIRATOR MAY CAUSE PREMATURE
WEAR OR DAMAGE TO STRAPS AND/OR
RESPIRATOR ASSEMBLY.
CAUTION
DO NOT LEAVE CYLINDER VALVE OPEN
WHEN RESPIRATOR IS NOT IN USE.
CAUTION
FAILURE TO RELEASE TENSION ON NECK
STRAPS BEFORE REMOVING FACEPIECE
MAY CAUSE PREMATURE WEAR OR DAM-
AGE TO STRAPS AND/OR FACEPIECE AS-
SEMBLY.
CAUTION
AN IMPACT TO THE REGULATOR WHILE
THE CYLINDER VALVE IS OPEN AND THE
AIR SAVER SWITCH IS ACTIVATED MAY
CAUSE AIR TO FLOW FROM THE REGULA-
TOR AND DEPLETE THE AIR REMAINING IN
THE CYLINDER.
WARNING
IF RESPIRATOR USE IS RESUMED AFTER
THE AIR HAS BEEN PARTIALLY CONSUMED
(CYLINDER LESS THAN FULL), YOU MUST
BE CERTAIN THAT THE REMAINING AIR
WILL BE SUFFICIENT FOR YOUR SAFETY.
USE OF A RESPIRATOR WITH INSUFFI-
CIENT AIR SUPPLY MAY RESULT IN
SERIOUS INJURY OR DEATH.
WARNING
DO NOT ALLOW RESPIRATOR TO DROP
WHEN HANDLING. DROPPING OF RESPIRA-
TOR MAY CAUSE DAMAGE TO RESPIRATOR
THAT MAY RESULT IN INJURY OR DEATH.
WARNING
AN IMPACT TO THE REGULATOR WHILE
THE CYLINDER VALVE IS OPEN AND THE
AIR SAVER SWITCH IS ACTIVATED MAY
CAUSE AIR TO FLOW FROM THE REGULA-
TOR AND DEPLETE THE AIR REMAINING IN
THE CYLINDER. DEPLETION OF THE AIR
SUPPLY MAY RESULT IN SERIOUS INJURY
OR DEATH.
WARNING
IF AIRFLOW FROM THE REGULATOR CAN-
NOT BE STOPPED BY DEPRESSING THE
AIR SAVER SWITCH, IMMEDIATELY CLOSE
THE CYLINDER VALVE TO PREVENT
DEPLETION OF THE AIR REMAINING IN
THE CYLINDER. DEPLETION OF THE AIR
SUPPLY MAY RESULT IN SERIOUS INJURY
OR DEATH.
TERMINATION OF USE
To doff the facepiece (i.e., remove the facepiece and terminate res-
piratory protection), proceed as follows:
1. Leave contaminated area or be certain that respiratory protection
is no longer required.
2. Loosen the neck straps by simultaneously lifting the lower buckle
release levers outward (away from the head) and lifting facepiece
away from face. The buckle release levers are the “U-shaped” ex-
tensions of the facepiece buckle assemblies.
NOTE
THE USER MAY FIND IT MORE COMFORTABLE TO FIRST RELIEVE
TENSION ON THE UPPER STRAP BY LIFTING THE UPPER BUCKLE
RELEASE LEVERS.)
3. To stop the flow of air from the facepiece, fully depress the air
saver/donning switch on top of the regulator and release.
NOTE
OPERATION OF THE AIR SAVER/DONNING SWITCH IS INTENDED
TO PREVENT A FREE FLOW OF AIR AND THE DEPLETION OF THE
AIR SUPPLY WHEN THE FACEPIECE DOFFED. WITH THE AIR
SAVER/DONNING SWITCH ACTIVATED, THE PURGE VALVE AND VI-
BRALERT WILL FUNCTION NORMALLY. IF THE PURGE VALVE HAS
BEEN ADJUSTED TO PRODUCE A FLOW, OR IF THE VIBRALERT IS
IN OPERATION, THE AIR WILL CONTINUE TO BE DEPLETED FROM
THE RESPIRATOR CYLINDER UNTIL THE CYLINDER VALVE IS
CLOSED.
4. Remove the facepiece by pulling it up and over the head.
NOTE
IF THE RESPIRATOR IS NOT GOING TO BE USED FOR A PERIOD
OF TIME, CLOSE THE CYLINDER VALVE. LEAVING THE AIR
SAVER/DONNING SWITCH ACTIVATED AND THE CYLINDER VALVE
OPEN FOR AN EXTENDED PERIOD OF TIME, MAY RESULT IN IN-
TERMITTENT ACTIVATION OF THE VIBRALERT EVEN WHEN
MORE THAN 25% OF THE AIR SUPPLY REMAINS.
5. To resume use of the respirator, repeat the facepiece donning pro-
cedure (see USE OF RESPIRATOR Section). If respirator use is
resumed, the user must make certain that the remaining air sup-
ply in the cylinder is sufficient to accomplish the purpose for which
respirator use has been resumed. It is recommended that, when-
ever practical, partially depleted cylinders be replaced with full cyl-
inders before respirator use is resumed. Never resume use of a
respirator where termination of use has occurred because of the
activation of an end of service indicator alarm without first deter-
mining and correcting the reason for the end of service indicator
alarm activation.
6. When respirator operations are completed and only when in a safe
breathing area, check that the cylinder valve is closed, and vent
the residual air from the respirator by opening the purge valve. After
waiting until the air flow stops, close the purge valve. Slightly loosen
shoulder straps by lifting ends of shoulder strap slide buckles up,
release waist belt by pressing release button in center of waist belt
buckle, and remove the unit from your back. Proceed in accordance
with the requirements of your respiratory protection program for
service of the respirator. The respiratory protection program should
include procedures for replacement of the cylinder with a fully
charged cylinder (see the CYLINDER REPLACEMENT Section of
this instruction) and for carrying out the instructions in the
STANDBY INSPECTION, CLEANING AND STORAGE section of
this instruction for respirator and accessories.