3M SCOTT AIR-PAK X3 PRO Installation and operation manual

OPERATING & MAINTENANCE
INSTRUCTIONS
3M™ SCOTT™ AIR-PAK™ X3 PRO
CGA & SNAP-CHANGE
Pressures 2.2, 4.5, 5.5
READ ALL INSTRUCTIONS BEFORE USE
P/N 595373-01 Rev C 202004
Self-Contained Breathing Apparatus (SCBA)
NFPA-1981 (2018 Edition) Compliant

READ ALL INSTRUCTIONS BEFORE USE
P/N 595373-01 Rev C 202004
3M™ SCOTT™ AIR-PAK™ X3 PRO
Self-Contained Breathing Apparatus (SCBA)
NFPA-1981 (2018 Edition) Compliant
CGA & SNAP-CHANGE
Pressures 2.2, 4.5, 5.5
OPERATING & MAINTENANCE
INSTRUCTIONS

All information, illustrations, and specifications in this manual are based on the latest product information available at
the time of publication. 3M reserves the right to make changes at any time without notice.
The contents of this manual may not be used, reproduced, or disclosed to any third party in whole or in part without
obtaining express written permission and authorization from 3M.
Cautionary Notice
While the manufacturer has attempted to detail in this manual all areas of possible danger to personnel in connection
with the use and servicing of this equipment, personnel should use caution when installing, inspecting, operating, and
servicing this equipment, especially when handling pressurized air cylinders. When maintaining or operating all
electronic equipment, care should be taken to avoid electrical shock in all circuits where substantial currents or
voltages may be present through design or component failure. Caution should be observed in lifting and hoisting
heavy equipment.
The manufacturer is specifically not liable for any damage or injury arising out of a user’s failure to follow the
instructions contained in this manual or failure to exercise due care and caution in the installation, operation,
inspection, and service of this equipment.
Import and Export
The international transport of this equipment and any related documentation is regulated under United States export
laws and regulations and may be regulated by the import or export laws and regulations of other countries.
If you have any questions or concerns regarding these regulations, contact 3M at 1-800-247-7257 (704-291-8300
outside the continental United States).
Questions or Concerns
If you have any questions or concerns regarding use of this equipment, contact your authorized 3M distributor, or
contact 3M at 1-800-247-7257 (704-291-8300 outside the continental United States) or
[email protected].
For all National Fire Protection Association (NFPA)-compliant versions of this respirator, report any operational
malfunctions to the certification agency Safety Equipment Institute (SEI), 1307 Dolley Madison Blvd, Suite 3A,
McLean, VA 22101, [phone], Fax [phone].
For all National Institute for Occupational Safety and Health (NIOSH)-compliant versions of this respirator, report
any complaints of damage, malfunction or failure of the breathing apparatus that may represent a hazard to the user
to the certification agency NIOSH/NPPTL/Respirator Branch, P.O. Box 18070, Pittsburgh, PA 15236, (412)
386-4000.

P/N 595373-01 Rev C 202004 iii
Contents
About This Manual .....................................................................................................................vii
Intended Readers...................................................................................................................................... vii
How to Read This Manual ...................................................................................................................... vii
Warnings, Cautions, and Notes ..................................................................................................... vii
Appendices .........................................................................................................................................viii
Before You Begin ......................................................................................................................................viii
Maintenance and Repairs ................................................................................................................viii
Retirement Criteria and Considerations ......................................................................................viii
Related Manuals........................................................................................................................................viii
Safety Information ......................................................................................................................ix
All 3M Scott Fire & Safety Products......................................................................................................ix
3M Scott Air-Pak SCBAs.......................................................................................................................... x
Chapter 1 Introduction .................................................................................................................................... 1
Before You Begin .........................................................................................................................................1
Overview ........................................................................................................................................................ 1
Major Components of the Respirator ....................................................................................................1
Backframe and Harness Assembly ................................................................................................. 2
Cylinder and Valve Assembly .......................................................................................................... 2
Dual-Redundant Pressure Reducer ................................................................................................ 2
Full Facepiece with Head Harness ................................................................................................. 2
Mask-Mounted Regulator .................................................................................................................3
Vibralert............................................................................................................................................................... 3
Heads-Up Display............................................................................................................................................. 3
Chapter 2 Inspecting the Respirator ............................................................................................................ 5
Before You Begin ........................................................................................................................................5
Inspecting the Respirator Components................................................................................................6
Performing a General Inspection ....................................................................................................6
Inspecting the Breathing Air Cylinder ............................................................................................6
Inspecting the RIC/UAC Connection ............................................................................................ 7
Inspecting the Facepiece ..................................................................................................................8
Inspecting the Regulator ................................................................................................................. 10
Performing Operational Testing.............................................................................................................12
General Testing ...................................................................................................................................12
Testing the Regulator ........................................................................................................................12
Testing the Heads-Up Display ....................................................................................................... 13
Testing the Sensor Module Lights ................................................................................................ 15
Testing the Batteries ......................................................................................................................... 16
Chapter 3 Operating the Respirator ............................................................................................................ 17
Before You Begin .......................................................................................................................................17
Donning the Respirator............................................................................................................................ 18
Donning the Facepiece ........................................................................................................................... 19
Starting the Respirator.............................................................................................................................23
Using the Respirator.................................................................................................................................25
Shutting Off the Respirator ....................................................................................................................25
Rev C
202004
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CONTENTS
iv P/N 595373-01 Rev C 202004
Replacing Air Cylinders...........................................................................................................................27
Replacing a CGA Cylinder ..............................................................................................................28
Replacing a Snap-Change Cylinder .............................................................................................29
Special Use Situations............................................................................................................................. 30
Resuming Use of the Respirator ................................................................................................... 30
Using the Respirator in Standby .................................................................................................... 31
Emergency Operation ...................................................................................................................... 31
Using the RIC/UAC Connection ...................................................................................................32
Using Alternate Cylinders ............................................................................................................... 33
Low Battery ........................................................................................................................................ 34
Low Temperature Operation ........................................................................................................ 34
Using the RIC/UAC in Low Temperatures.............................................................................................. 34
Using Scott Sight in Low Temperatures (AV-3000 HT Facepieces).............................................. 35
Chapter 4 Cleaning & Storing the Respirator ........................................................................................... 37
Before You Begin ......................................................................................................................................37
Cleaning the Respirator...........................................................................................................................37
Cleaning the Facepiece .................................................................................................................. 38
Cleaning the Mask-Mounted Regulator ..................................................................................... 39
Cleaning the Shoulder Harness and Waist Pad ......................................................................... 41
Storing the Respirator.............................................................................................................................. 41
Chapter 5 Replacing Batteries .....................................................................................................................43
Before You Begin ..................................................................................................................................... 43
Replacing Batteries in Respirators with PASS.................................................................................. 43
Chapter 6 NIOSH Cautions & Limitations .................................................................................................45
Cautions and Limitations ....................................................................................................................... 45
Cautions and Limitations of Use for CBRN SCBA .......................................................................... 45
S—Special or Critical User’s Instructions.......................................................................................... 45
EBSS—Special or Critical User’s Instructions.................................................................................. 46
Appendix A Air-Pak X3 Pro Models .............................................................................................................. 47
Appendix B Approvals & Certifications .........................................................................................................49
NIOSH Certification................................................................................................................................ 49
NFPA Compliance................................................................................................................................... 49
Appendix C Intrinsic Safety ..............................................................................................................................51
Appendix D Safety Listings ..............................................................................................................................53
FCC Compliance ..................................................................................................................................... 53
FCC Compliance Statement (Part 15.19) ................................................................................... 53
FCC Warning (Part 15.21) ............................................................................................................... 53
Class B Digital Device............................................................................................................................. 53
Industry Canada Compliance ............................................................................................................... 54
Industry Canada Statement ........................................................................................................... 54
La Declaration de Canada d’Industrie ......................................................................................... 54
Appendix E Service Life ................................................................................................................................... 55
Appendix F Respirator Testing........................................................................................................................ 57
DOT Specifications ..................................................................................................................................57

CONTENTS
P/N 595373-01 Rev C 202004 v
Appendix G Facepiece Fitting .........................................................................................................................59
About Fit Testing ..................................................................................................................................... 59
CBRN SCBA or APR ............................................................................................................................... 60
Fit Testing Procedure ............................................................................................................................. 60
Negative Pressure Leak Test .........................................................................................................60
Quantitative Fit Testing .................................................................................................................. 60
Routine Testing .................................................................................................................................. 61
Facepiece Sizes......................................................................................................................................... 61
Appendix H Options & Accessories................................................................................................................63
Appendix I Related Manuals...........................................................................................................................65

CONTENTS
vi P/N 595373-01 Rev C 202004

P/N 595373-01 Rev C 202004 vii
ABOUT THIS MANUAL
This manual provides operating and maintenance instructions for the 3M Scott Air-Pak X3 Pro Self-Contained
Breathing Apparatus (SCBA).
Intended Readers
3M provides manuals for individuals with different levels of training. This manual is written for Trained Operators.
•A Trained Operator is an individual who has had minimum-level training in the use of 3M Scott Fire & Safety
equipment in an immediately dangerous to life or health (IDLH) environment. This individual is often a firefighter
or the wearer of an SCBA. He or she is familiar with the instructions provided in this manual and is capable of
performing basic maintenance tasks as outlined.
•A Certified Technician is an individual who has successfully completed the Air Supplied Certified Technician
class offered by 3M. Certified technicians are able to use specialized equipment, including the Posi 3 USB™ 1
SCBA testing equipment, and are able to make repairs to the SCBA that involve the air flow path.
How to Read This Manual
Warnings, Cautions, and Notes
Throughout this manual, special references are made when deemed important. The following classifications
distinguish these references by their level of importance:
1. Posi3 USB is a trademark of Honeywell Analytics, Inc., Lincolnshire, IL.
WARNING
Indicates a hazardous situation which, if not avoided, could result in serious injury or death
CAUTION
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury and/or
property damage
NOTE
Indicates a situation which, if not avoided, could result in property damage
TIP
Indicates helpful information
P/N 595373-01
202004
Rev C

ABOUT THIS MANUAL
viii P/N 595373-01 Rev C 202004
Appendices
The appendices are located in the back of this manual and contain important material such as warranty details,
certifications, and license agreements.
Before You Begin
Before beginning any procedures, review the manual in its entirety. Thoroughly read all warnings, cautions, and
notes. Ensure that the proper tools, kits, parts, and materials are at hand and ready for use; any required tools and
other supporting materials are listed at the beginning of the procedure. When performing any maintenance checks or
services on any 3M Scott Fire & Safety product or device, proceed only as far as necessary and as instructed by this
manual.
Maintenance and Repairs
Comply with all instructions and warnings contained in all applicable manuals.
It is your responsibility to obtain and use the most current instructions that apply to the operations being performed.
The instructional material must include the most current materials: manuals or manual modules, Operation and
Maintenance Instructions, Inspection and Cleaning Instructions, Installation and Use Instructions, and any additional
3M-approved support material required to maintain the equipment.
Current service literature is available from 3M. The Certified Technician I Training Manual contains additional
maintenance information that goes beyond the routine cleaning and regular operational inspection of the respirator
but is less advanced than Certified Technician II-level maintenance available at a 3M Authorized Service Center. A
person with good mechanical ability using standard hand tools is capable of performing Technician I-level tasks.
Contact 3M or your 3M distributor for details.
Because this equipment may be used to support human life in a hazardous atmosphere, do not attempt
maintenance beyond that described in this instruction or in the Certified Technician I Training Manual. If
disassembly or adjustment other than described in this manual or the Certified Technician I Training Manual is
required, the equipment must be serviced by a 3M Authorized Service Center in accordance with the appropriate
3M Technician Service Manuals. You can arrange service by an Authorized Service Center through your authorized
3M distributor or by contacting 3M.
If you note a discrepancy while performing operation or maintenance checks and services, tag the equipment as
“Out of Service” and refer it to a 3M Certified Technician II.
While an attempt has been made to address all foreseeable operation/service conditions, exercise careful
judgment in removing from service any equipment that does not appear to function correctly, even if all operator-
level maintenance checks and services have been completed. If there is any doubt regarding the safe operation of
the equipment, remove it from service and tag it for repair.
Retirement Criteria and Considerations
Retirement criteria and considerations to be determined by technicians with Certified Technician II qualifications in
accordance with NFPA 1852.
Related Manuals
For information about other user manuals related to this product, see "Appendix I: Related Manuals” on page 65.

P/N 595373-01 Rev C 202004 ix
SAFETY INFORMATION
Read all of the safety information before beginning any of the procedures in this manual. The safety information in
this section is organized as follows:
•“All 3M Scott Fire & Safety Products” on page ix
•“3M Scott Air-Pak SCBAs” on page x
All 3M Scott Fire & Safety Products
The following safety directives apply to all 3M Scott Fire & Safety products.
•Many 3M Scott Fire & Safety products are intended to support human life in hazardous atmospheres. Failure to
carefully read, understand, and follow the instructions and warnings in this manual may result in serious injury or
death.
•Improper use of this equipment may result in serious injury or death. Improper use includes, but is not limited to,
use without adequate training, disregard of the warnings and instructions contained herein, use of the equipment
for purposes not included in these instructions, and failure to inspect and maintain the equipment.
•Apply only the instructions offered within this manual. Maintenance procedures beyond the scope of this manual
must not be performed. Additional disassembly may cause operation errors and/or component failure and result
in serious injury or death. If a discrepancy or malfunction cannot be corrected using the procedures contained
within this manual, the product must be tagged to indicate that it is unserviceable and referred to a 3M certified
technician for evaluation and repair.
•Exercise caution when using chemicals. Prior to using any chemical substance, thoroughly review and understand
the product label, Safety Data Sheet (SDS), and manufacturer’s use instructions. Chemical substances may
present serious hazards such as flammability and human-specific health hazards, which can affect the nervous
and reproductive systems. Failure to adhere to the manufacturer’s product instructions and warnings may result
in serious injury or death.
•Comply with all instructions and warnings contained in this and all applicable manuals and modules. While an
attempt has been made to address all foreseeable operating conditions, you must exercise careful judgment
when operating any equipment. If there is any doubt regarding the safe operation of equipment, remove the
equipment from service and tag it for repair.
•Failure to use 3M-approved lubricants and replacement parts will invalidate all certifications and warranties
issued to the 3M Scott Fire & Safety product.
•You are responsible for any damage, improper function, or injury as a result of user-applied markings, etchings,
labeling, material additions, or modifications to the equipment.
Rev C
202004
P/N 595373-01

SAFETY INFORMATION
xP/N 595373-01 Rev C 202004
3M Scott Air-Pak SCBAs
The following safety directives, warnings, and cautions apply to 3M Scott Air-Pak respirators.
•Improper use of this equipment may result in serious injury or death. Improper use includes, but is not limited to,
use without adequate training, disregard of the warnings and instructions contained herein, and failure to inspect
and maintain this equipment. Read and understand all instructions before attempting to operate or service this
equipment.
•The information in this instruction is meant to supplement — not replace — the instructions, training, supervision,
maintenance, and other elements of your organized respiratory protection program.
•Use this equipment only in conjunction with an organized respiratory protection program that complies with the
requirements of the following:
•American National Standard Practices for Respiratory Protection, Z88.2, current edition, available from
American National Standards Institute, Inc., 1430 Broadway, New York, NY, 10018
•OSHA Safety and Health Standard 29 CFR 1910, Paragraph 134, available from the US Department of Labor,
Occupational Safety and Health Administration
•Other pertinent nationally recognized standards, such as those of the US Coast Guard or the Department of
Defense
•This equipment is designed and intended to function properly in reasonable/ordinary firefighting conditions. It
has been certified to the NFPA 1981, 2018 Edition standard. The functionality of this equipment may be
compromised by extreme fire conditions.
•Training is required before use of this equipment. Use this equipment only if you have been trained in its use and
only in conjunction with an organized respiratory protection program. Do not use this equipment for purposes
other than those authorized by your respiratory protection program. Do not use this equipment underwater.

SAFETY INFORMATION
xi P/N 595373-01 Rev C 202004
WARNING
The following table lists hazardous situations which, if not avoided, could result in serious injury or death.
Read all of the warning statements before beginning any of the procedures in this manual.
Follow the instructions below...
... to reduce the risk associated with...
Dermal exposure
to contaminants
Entanglement Explosion Exposure to
contaminants
Exposure to CBRN*
environments
Exposure to
extreme heat
Fire Impact
Impact from falling or tripping Loss of air supply Oxygen-deficient
atmospheres
Reduced service
life
Always wear the appropriate personal protective equipment in accordance with your Environmental Health and Safety
(EHS) program. This respirator protects only your respiratory system and part of your face. X X
Any contaminants must be identified and effectively removed. Contaminated components must be removed and disposed
of in accordance with applicable regulations. X
Stay alert when operating this equipment. Do not operate this equipment while fatigued or under the influence of drugs,
alcohol, or medication that may affect vision, dexterity, or judgment. X X X X
Do not perform maintenance beyond the scope of these instructions without proper training, equipment, and authorization
from 3M. X X X X
Use only 3M-approved replacement parts for maintenance and repair of this equipment. X X X X X
Use only those respirator components, accessories, or devices listed on the NIOSH label located on the respirator. Use
only approved air cylinders and valve assemblies specified by the NIOSH label located on the respirator. X X X X X X
Do not apply labels or markings to the respirator or its accessories. Labels or markings could interfere with the operation of
the respirator. X X X
Do not apply labels or markings to the existing labels on this equipment or its accessories. Labels or markings could
interfere with the proper identification of the assemblies that may result in errors in maintenance. X X X
Do not drop the respirator. Dropping the respirator may result in damage to the respirator that may affect its performance
or release high-pressure breathing air. X X X
Follow the regular operational inspection procedures exactly as written. If the respirator does not operate as described or
if any other operational malfunction is noted, do not use the respirator. Remove it from service and tag it for repair by
authorized personnel.
X X X X X
Inspect the respirator for worn parts. If the coating is worn through and bare metal is showing on the male
quick-disconnect locking ridge, remove the regulator assembly from service and tag it for replacement. X X X
Regularly inspect the electronic components, as described in the instructions, for loose or worn electrical conductors. X X
Conduct regular operational inspections of all battery-operated devices on this equipment. Confirm that the batteries are
properly installed and that the devices function. X X X X
Use only batteries from the list provided in these instructions for this equipment. X X X X
Replace batteries in an area free of flammable gases, vapors, and dust. X X X X
Do not mix old and new batteries. X X X X
Do not mix batteries from different manufacturers. X X X X

3M SCOTT AIR-PAK SCBAS
P/N 595373-01 Rev C 202004 xii
Do not use the respirator if the PASS device fails to function as described. Remove the respirator from service and tag it for
repair by authorized personnel. X X X X X
Replace the batteries in the PASS device when the low battery alarm sounds. X X X X
The PASS device may malfunction due to radio frequency interference (RFI). See the user instructions provided for the
PASS device for information about and instructions to identify RFI sources and associated symptoms due to RFI. X X X X
Regularly inspect cylinders for damage and empty the air from damaged cylinders. X
The breathing air cylinder must be inspected and refilled only by trained and authorized personnel. X X
Never use a cylinder with a damaged cylinder valve assembly or damaged cylinder valve assembly threads. X X X X X
Do not fill the cylinder if the respirator or the cylinder to be charged is known or suspected to have been dropped, exposed
to direct flame impingement, or damaged in any way. X
Never charge a cylinder to more than the rated pressure marked on the cylinder. X X X X X
Verify that the cylinder connector is clean and free of dirt and debris. Dirt in the connector can contaminate the breathing
air path and may cause the respirator to malfunction. X X X
Use the tri-slide buckle on the retention strap to secure the cylinder tight against the backframe.X X
Start with a full cylinder. Use a partially filled cylinder only in emergency conditions if a full cylinder is not available. If you
resume use of the respirator after the air has been partially consumed, you must be certain that the cylinder contains
sufficient air to allow time for completion of the tasks involved and your return to a safe atmosphere with an adequate
margin for safety.
X X X
Open the cylinder valve fully before operating the respirator. A partially opened cylinder valve may cause a reduction of air
supplied and/or a sudden and complete loss of air supply. X X X X X
The cylinder valve should always be fully open when the respirator is in use, except in situations in which the air supply
flows freely into the facepiece. For more information, see “Emergency Operation” on page 31. X X X
Understand the hazards of heat exposure including, but not limited to, temperature, duration, and repeat exposure when
using facepieces that incorporate heat-resistant materials. X X
Your facepiece must be properly fitted using a respirator quantitative fit test before use, and you must be properly trained
in the use of the respirator. X
Verify that the facepiece is properly donned according to the donning procedures provided in these instructions and that
the protective hood does not interfere with the face-to-facepiece seal. X X
If any donning problems are found as described in these instructions, remove the facepiece and follow the applicable
donning procedure for your facepiece. X X X X X
Do not use the respirator when you do not have a good seal between the face and facepiece. To maintain a good seal, the
respirator facepiece must be clear of obstructions, including, but not limited to, beards, facial hair, and sideburns. Nothing
should interfere with the smooth and close fit of the head harness to the head.
X X X
If you detect an air leak into the facepiece while checking the face-to-facepiece seal, do not use the respirator. X X X X
Install the nose cup on the facepiece. Failure to use the nose cup may cause obscured vision. X X
Confirm that the regulator latch is engaged with the facepiece. If the regulator latch is not engaged, the regulator could
rotate and fall out. X X X X
Confirm that all hose couplings are engaged. If they are not engaged, the hoses may separate. X X X X
Follow the instructions below...
... to reduce the risk associated with...
Dermal exposure
to contaminants
Entanglement Explosion Exposure to
contaminants
Exposure to CBRN*
environments
Exposure to
extreme heat
Fire Impact
Impact from falling or tripping Loss of air supply Oxygen-deficient
atmospheres
Reduced service
life

SAFETY INFORMATION
xiii P/N 595373-01 Rev C 202004
Do not use the respirator if the heads-up display (HUD) lights do not operate as described. Remove the respirator from
service and tag it for repair by authorized personnel. X X X X
Ensure that you can access the controls on this equipment at all times. Verify that other personal protective equipment
does not interfere with the protection provided by the equipment and does not interfere with the access to the controls. X X
Do not attach anything to, or carry anything on, the respirator shoulder strap buckles, as this could cause them to loosen
during use of the respirator. X X X X
Ensure the respirator straps and waist belt are properly adjusted and the loose ends of the straps and belt are secured so
that the respirator does not shift on your body and the face-to-facepiece seal is not disturbed. X X X X
Do not use the drag rescue loop as a handle for lifting a user off the ground or for lowering a user from a height. X
Leave the area if the Vibralert actuates before the air supply is depleted to approximately 33%. This may indicate a failure
of the respirator. X X
Leave the contaminated area immediately when any end-of-service indicator alarm (Vibralert or HUD) actuates. This
occurs at 33% of the full pressure of the cylinder. X X X
Follow the low temperature operation instructions when using the respirator in temperatures at or below freezing (32° F /
0° C). X X
The RIC/UAC system is for emergency use only. Do not use the RIC/UAC system to charge an air cylinder while the
respirator is being worn unless there is a compelling reason to assume the risk of injury. X X X
If a leak is detected while performing an emergency filling process using RIC/UAC system in a IDLH** atmosphere,
discontinue the filling process and leave the IDLH atmosphere immediately. X X X
When performing an emergency replenishment of a breathing air supply cylinder using the RIC/UAC, do not exceed 1500
psig/minute while the filling pressure is held constant at the cylinder's rated pressure. X
When performing an emergency replenishment of a breathing air supply cylinder using the RIC/UAC where the
temperature is below freezing, see “Using the RIC/UAC in Low Temperatures” on page 34.X X
Verify that all moisture has been removed from the regulator after cleaning. X X X
Do not store the respirator with worn or damaged components. X X X X
Do not use an RFID tag reader that has an output power greater than 6 Watts while in a flammable atmosphere. X X
Follow the instructions below...
... to reduce the risk associated with...
Dermal exposure
to contaminants
Entanglement Explosion Exposure to
contaminants
Exposure to CBRN*
environments
Exposure to
extreme heat
Fire Impact
Impact from falling or tripping Loss of air supply Oxygen-deficient
atmospheres
Reduced service
life

3M SCOTT AIR-PAK SCBAS
P/N 595373-01 Rev C 202004 xiv
* CBRN: chemical, biological, radiological, and nuclear
** IDLH: immediately dangerous to life or health
CAUTION
The following table lists hazardous situations which, if not avoided, could result in minor or moderate injury and/or property damage
Read all of the caution statements before beginning any of the procedures in this manual.
Follow the instructions below...
... to reduce the risk associated with...
Dermal exposure
to contaminants
Entanglement Explosion Exposure to
contaminants
Exposure to CBRN*
environments
Exposure to
extreme heat
Fire Impact
Impact from falling or tripping Loss of air supply Oxygen-deficient
atmospheres
Reduced service
life
Inspect the coupling seal and replace if missing or damaged. A missing or damaged seal will result in an air leak, reduce the
duration of use, or may prevent the end-of-service alarm from actuating. X X X
Inspect the high-pressure seal and replace if missing or damaged when replacing the cylinder. A missing or damaged seal
will result in an air leak and reduce the duration of use. X X X

P/N 595373-01 Rev C 202004 1
Rev C
202004
P/N 595373-01 CHAPTER 1
INTRODUCTION
This chapter describes the 3M Scott Air-Pak X3 Pro respirator and its major components.
Before You Begin
Carefully read “Safety Information” on page ix before beginning any of the procedures in this manual.
Overview
The Air-Pak X3 Pro self-contained breathing apparatus (SCBA) is a respirator that provides respiratory protection to
an individual when entering, working in, or exiting an objectionable, oxygen-deficient, or unbreathable (toxic)
atmosphere. This equipment is designed to withstand exposure to certain environmental conditions as defined by the
applicable approvals.
For information about the available configurations of the Air-Pak X3 Pro SCBA, see "Appendix A: Air-Pak X3 Pro
Models” on page 47.
Major Components of the Respirator
The basic Air-Pak X3 Pro consists of the following components (see Figure 1-1):
•Backframe and Harness Assembly (includes the backframe, shoulder harness, and waist pad)
•Cylinder and Valve Assembly
•Dual-Redundant Pressure Reducer
•Full Facepiece with Head Harness
•Mask-Mounted Regulator
All Air-Pak X3 Pro respirators described in this instruction are equipped with at least two independent end-of-
service time indicators, a remote pressure gauge mounted on the shoulder harness, an air-saver mechanism
located on the breathing regulator, and a Rapid Intervention Crew/Company Universal Air Connection (RIC/UAC).
TIP
Batteries are required for the proper operation of this equipment. Refer to “Chapter 5: Replacing
Batteries” on page 43 for more information.

INTRODUCTION
2P/N 595373-01 Rev C 202004
Figure 1-1 3M Scott Air-Pak X3 Pro SCBA respirator
Backframe and Harness Assembly
All model respirators described by these instructions feature an aluminum backframe equipped with a shoulder
harness and a waist pad made of Kevlar® fiber 1 and 3M™ Scotchlite™ Reflective Material 2. The drag rescue loop
is a strap integrated into the shoulder harness of the SCBA to assist with rescuing a downed user. The optional
Universal Emergency Breathing Support System (UEBSS) connects to the waist pad and provides an accessory hose
to supply air to or receive air from another respirator user or to connect to an extended duration air supply hose
line.3
Cylinder and Valve Assembly
The cylinder mounts on the Air-Pak X3 Pro CGA with a CGA-threaded hose coupling and on the Air-Pak X3 Pro
Snap-Change with a Snap-Change connector. Both types of cylinders are available as 2.2 (2216 psig), 4.5 (4500
psig), or 5.5 (5500 psig) pressures.
Dual-Redundant Pressure Reducer
The dual-redundant pressure reducer provides two pressure reducers in one, interconnected through an automatic
transfer valve. A reduction in primary pressure triggers an automatic transfer to the secondary circuit to provide an
uninterrupted supply of air. When the transfer occurs, the Vibralert end-of-service indicator alarm on the regulator
actuates (see “Vibralert” on page 3).
Full Facepiece with Head Harness
The full facepiece is available in specific models and sizes. Before use, the facepiece must be properly fitted as
outlined in "Appendix G: Facepiece Fitting” on page 59.
1. DuPont™ and Kevlar® are trademarks or registered trademarks of E.I. du Pont de Nemours and Company.
2. 3M and Scotchlite are registered trademarks of 3M Company and its affiliates.
3. The Universal EBSS fittings are not compatible with older 3M Scott Air-Pak SCBAs. For SCBAs manufactured prior to
the NFPA 1981, 2018 edition standard, please contact 3M for upgrade options.
Dual-Redundant Pressure
Reducer
Cylinder & Valve
Assembly
Mask-Mounted
Regulator
Waist Pad
Backframe Remote Pressure
Gauge
UEBSS Pouch
(optional)
Quick-Disconnect
(optional)
Shoulder Harness
Drag Rescue Loop

MAJOR COMPONENTS OF THE RESPIRATOR
P/N 595373-01 Rev C 202004 3
Fit testing per OSHA Standard 29 CFR Part 1910.134 Appendix A, or ANSI/AIHA/ASSE Z88.10, current edition,
requires testing in the negative pressure mode using Quantitative Fit Test (QNFT) protocols deemed acceptable by
those standards. For quantitative fit testing, 3M Scott Fire & Safety facepieces require use of a Fit Test Adapter or
equivalent and appropriate negative pressure testing equipment. A Mask Seal Kit may also be required to attain a
proper fit. See "Appendix G: Facepiece Fitting” on page 59.
Mask-Mounted Regulator
The removable pressure-demand breathing regulator mounts directly to the facepiece and is equipped with an air-
saver mechanism and a red purge knob.
Vibralert
All models of the Air-Pak X3 Pro respirator are equipped with the Vibralert end-of-service indicator alarm in the
mask-mounted regulator. The Vibralert serves as an end-of-service time indicator and alerts you of a malfunction in
the dual-path pressure reducer. In normal operation, the Vibralert vibrates the breathing regulator and facepiece to
warn you by both sound and feel that approximately 33% of full cylinder pressure remains. In addition, if the
primary air path of the pressure reducer becomes blocked or should fail closed, the secondary air path will
automatically begin supplying air to the breathing regulator, and the Vibralert will warn you of the malfunction.
Heads-Up Display
The Heads-Up Display (HUD) is an independent end-of-service time indicator alarm attached to the
mask-mounted regulator and is standard on respirators required to have two independent redundant alarms. The
HUD provides a visual indication of the air supply with four lights that appear just below the field of vision within the
facepiece. A separate low battery light warns you when the batteries must be replaced. The HUD detects cylinder
pressure directly and is totally independent of the Vibralert end-of-service indicator alarm.
TIP
The auto air-saver switch on the E-Z Flo C5 regulator (compatible with the 3M Scott Vision C5
facepiece) is located on the latch for mounting the regulator to and removing it from the facepiece. When
properly engaged, the latch locks the regulator in place on the facepiece and prevents it from rotating.
TIP
The HUD of the 3M™ Scott™ E-Z Flo C5 regulator (compatible with the 3M Scott Vision C5 facepiece)
includes three additional lights to indicate the following:
•Initiation of a PAR request
•Initiation of an evacuation command or a system integrity alarm
•Actuation of a Personal Alert Safety System (PASS) full alarm (distress alarm)
There is also an externally facing light that indicates the air supply in the cylinder.
For more information about HUD lights, see “Testing the Heads-Up Display” on page 13.

INTRODUCTION
4P/N 595373-01 Rev C 202004