Scott 2.2 Operating & Maintenance Instructions page 17

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 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 descend-
ing order. Close the purge valve when the gauge needle crosses the
"1/3" mark but before the beginning of the red "EmPTY" band. See
FIGURE 7.
TO TEST THE HEADS-UP DISPlAy, CONTROl THE NEEDlE
BETWEEN 1/3 AND TOP OF "EMPTy"
HEADS-UP DISPlAy ONly
Model 4.5 gauge shown
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) On units equipped with either the PASS or the SEmS II Console,
the gauge shall be illuminated by a RED light.
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 indi-
cator.
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.
PASS or SEMS II CONSOlE
Model 2.2 gauge shown
FIGURE 7
Page 17 of 48
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.
REGUlAR OPERATIONAl INSPECTION
CONTINUED ON NEXT PAGE...
P/N 595279-01 Rev. B 5/14