5
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 NxG
2
SCBA 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
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