Scott AIR-PAK 75i 2.2 Operating & Maintenance Instructions page 15

9. Push in and rotate the cylinder valve knob clockwise to close. When
the cylinder valve is fully closed, open the purge valve slightly to
vent residual air pressure from system. As the residual air pres-
sure 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
descending order. Close the purge valve when the gauge needle
crosses the "¼" mark but before the beginning of the red "EMPTY"
band (see FIGURE 9).
CONTROL NEEDLE BETWEEN
1/4 AND TOP OF "EMPTY"
FIGURE 7
Remote Gauge
a) The VIBRALERT end of service indicator alarm shall actuate (rapid
clicking).
b) The red light on the far left of the HEADS-UP DISPLAY shall flash
rapidly at ten (10) times per second.
c) If installed, the PASS device with electronic end of service time
indicator will actuate (audible signal from Sensor Module and
flashing display "LOW AIR").
10. After verifying that all alarms are functioning, open the purge valve
slightly to vent the remaining residual air pressure from the sys-
tem.
a) All alarms shall cease operation when the system pressure drops
to zero except the accessory electronic end of service time indica-
tor.
b) To terminate the electronic end of service time indicator, press the
Manual Reset button on the Control Console twice and then twice
again after the flashing green light sequence.
11. When air flow stops completely, return purge valve to the fully closed
position (pointer on knob upward).
IF ANY DISCREPANCY OR MALFUNCTION IS NOTED DURING
T H E I N S P E C T I O N , D O N O T U S E T H E R E S P I R A T O R . R E M O V E
THE RESPIRATOR FROM SERVICE AND TAG IT FOR REPAIR BY
AUTHORIZED PERSONNEL.
Page 15 of 44
CAUTION
OVERTIGHTENING THE CYLINDER VALVE
MAY CAUSE DAMAGE THAT COULD RESULT
IN LEAKAGE OF AIR FROM THE CYLINDER.
USE NO TOOLS TO CLOSE THE CYLINDER
VALVE.
WARNING
LEAKAGE OF AIR FROM A RESPIRATOR
MAY INDICATE A POTENTIALLY SERIOUS
DEFECT. AIR LEAKAGE MAY REDUCE THE
D U R A T I O N O F U S E A N D / O R T H E T I M E
REMAINING AFTER THE END OF SERVICE
ALARM ACTUATES OR MAY PREVENT THE
END OF SERVICE ALARM FROM ACTUAT-
ING. USE OF A RESPIRATOR EXHIBITING AN
AIR LEAK MAY RESULT IN EXPOSING THE
RESPIRATOR USER TO THE ATMOSPHERE
THE RESPIRATOR IS INTENDED TO PRO-
TECT AGAINST WHICH COULD LEAD TO
SERIOUS INJURY OR DEATH.
P/N 595236-01 Rev. B 10/11