Scott AIR-PAK 75i 2.2 Operating & Maintenance Instructions page 24

USE OF RESPIRATOR CONTINUED...
BEGIN USE OF THE RESPIRATOR
1. Fully depress the center of the air saver/donning switch on top of
regulator and release.
2. If the regulator is not attached to the facepiece, proceed as follows:
a) Verify that the regulator gasket is not damaged and is in place
around the outlet port of the regulator.
b) Align the two flats of the regulator outlet port with the corre-
sponding flats in the facepiece port (the red purge valve on the
regulator will be in the 12 o'clock position). Insert the regulator
into the facepiece port.
c) Rotate the regulator counterclockwise (as viewed from inside
of facepiece) until the red purge valve knob is on the left side
of the facepiece. The lock tab on the regulator will lock into the
facepiece retainer with a "click." When the lock tab is properly
engaged, the regulator will not rotate.
3. Slowly open cylinder valve fully by turning the valve knob counter-
clockwise until it stops (approximately 2 1/2 full turns of the knob).
Install regulator on facepiece.
Fully open the cylinder valve
knob by turning counterclock-
wise (approximately 2½ turns).
VIBRALERT alarm on regulator
will sound momentarily.
FIGURE 12
4. The VIBRALERT end of service indicator alarm will actuate and then
stop. If the air saver/donning switch has not been depressed prior
to opening the cylinder valve, the VIBRALERT Alarm will not actuate
due to the air flowing freely on the facepiece.
5. With facepiece sealed to face, inhale sharply to actuate respirator.
Air will then be supplied during inhalation.
IF AIR IS NOT SUPPLIED ON FIRST INHALATION, CHECK THAT THE
CYLINDER VALVE IS FULLY OPEN, THE REMOTE GAUGE INDICATES
PRESSURE IN THE CYLINDER, AND THE FACEPIECE IS SEALED TO
THE FACE.
6. Always check the facepiece seal, the system seal, and the operation
of the end of service alarm using the following procedure:
a) Completely close the cylinder valve by pushing in on the cylinder
valve and rotating it clockwise.
b) Breathe on respirator. As the air pressure falls in the respirator,
the VIBRALERT end of service indicator alarm will actuate (rapid
clicking of the VIBRALERT Alarm).
c) Resume breathing on the respirator until all air stops flowing from
the breathing 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.
d) Open cylinder valve and breathe normally.
P/N 595236-01 Rev. B 10/11
NOTE
Page 24 of 44
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 SUP-
PLIED 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 RESULT IN EXPOS-
ING THE USER TO THE ATMOSPHERE THE
RESPIRATOR IS INTENDED TO PROTECT
AGAINST.
WARNING
FAILURE TO CHECK THE FACE TO FACE-
PIECE SEAL BEFORE USE MAY RESULT IN
USE OF THE RESPIRATOR WITH A POOR
FACE TO FACEPIECE SEAL. A POOR FACE
TO FACEPIECE SEAL MAY RESULT IN LOSS
OF AIR WHICH MAY CAUSE REDUCED DU-
RATION OF USE AND/OR EXPOSURE OF THE
USER TO THE HAZARDOUS ATMOSPHERE
WHICH COULD RESULT IN SERIOUS INJURY
OR DEATH.