Scott AIR-PAK 75i 2.2 Operating & Maintenance Instructions page 29

6. Connect the RIC UAC filling hose assembly by pushing the quick discon-
nect coupling on the RIC UAC filling hose assembly on to the coupling
on the respirator until the quick disconnect sleeve "clicks" into place. See
FIGURE 14.
7. Slowly open the RIC UAC filling hose assembly valve to pressurize the
supply line and begin air flow to the cylinder.
WHEN THE REGULATED FILLING PRESSURE IS HELD CONSTANT AT THE
CYLINDER RATED PRESSURE THROUGHOUT THE CHARGING CYCLE
THE FLOW MUST BE MONITORED TO NOT EXCEED 1500 PSIG/MINUTE
FOR MOST CYLINDER AND VALVE ASSEMBLIES.
IF AT ANY TIME DURING THE FILLING PROCESS A LEAK IS DETECTED,
IMMEDIATELY DISCONTINUE THE FILLING PROCEDURE AND LEAVE THE
IDLH ATMOSPHERE.
8. Continually monitor the pressure gauge on the respirator user's cylinder
while filling. When the pressure gauge on the user's cylinder reads
"FULL," immediately terminate filling and disconnect the air supply
source. A check valve in the RIC UAC coupling on the respirator will
prevent air from flowing out of the respirator user's cylinder.
a) If the respirator user's cylinder is being filled from a portable air
supply cylinder (such as a SCOTT RIT-PAK portable air supply), the
air from the supply cylinder will stop flowing when the pressure in
the respirator user's cylinder equals the remaining pressure in the
portable air supply (pressures will balance). Disconnect the RIC UAC
filling hose assembly.
b) If the respirator user's cylinder is being filled from a supply hose con-
nected to a high pressure air supply source, extra care is required to
prevent over filling the respirator user's cylinder. If the supply pres-
sure exceeds the pressure rating for the complete respirator, the RIC
UAC relief valve will open when the respirator user's cylinder is full
and will reset after the high pressure air supply is disconnected. The
cylinder pressure gauge should indicate "full" at this time. Disconnect
the RIC UAC filling hose assembly.
THE RIC UAC MANIFOLD IS FITTED WITH A RELIEF VALVE TO VENT AIR
IF THE RATED PRESSURE OF THE RESPIRATOR IS EXCEEDED. IF THIS
OCCURS, SHUT OFF THE AIR FROM THE RIC UAC FILLING HOSE AS-
SEMBLY AND DISCONNECT THE AIR SUPPLY. THE RELIEF VALVE WILL
RESET AFTER EXCESS PRESSURE IS RELEASED.
THE RIC UAC ASSEMBLY IS DESIGNED WITH INTEGRAL PROTECTION
DEVICES. DO NOT DISASSEMBLE OR MODIFY ANY PART OF THIS AS-
SEMBLY.
9. When charging is complete, disconnect the RIC UAC filling hose assembly
from the RIC UAC coupling on the respirator. To disconnect RIC UAC fill-
ing hose assembly, pull the coupling sleeve away from the respirator until
the coupling disengages. Install the dust caps on the RIC UAC coupling
and on the RIC UAC filling hose assembly coupling.
10. Charging the cylinder will increase the temperature of the air within the
cylinder. When charging is complete and the cylinder cools to ambient
temperature, the pressure within the cylinder will fall slightly. If practical
in the situation, top off the cylinder to ensure optimum service time.
IF CHARGING IN COLD AMBIENT CONDITIONS WHERE THE TEMPERA-
TURES ARE BELOW FREEZING, SEE THE USE OF THE RIC UAC IN LOW
TEMPERATURE SECTION OF THIS INSTRUCTION.
11. After charging is complete, monitor the cylinder pressure on the respira-
tor and repeat the above procedure as needed until the respirator user
can be removed from the hazardous atmosphere.
NOTE
NOTE
NOTE
NOTE
NOTE
Page 29 of 44
WARNING
IF AT ANY TIME DURING THE FILLING PROCESS
A LEAK IS DETECTED, IMMEDIATELY DISCON-
TINUE THE FILLING PROCEDURE AND LEAVE
THE IDLH ATMOSPHERE. CONTINUING TO FILL
A RESPIRATOR THAT HAS EXHIBITED A LEAK
MAY CAUSE A FAILURE OF THE EQUIPMENT
WHICH MAY RESULT IN SERIOUS INJURY OR
DEATH.
P/N 595236-01 Rev. B 10/11