Using Alternate Cylinders - 3M SCOTT AIR-PAK X3 PRO Operating & Maintenance Instructions

3 Connect the RIC/UAC charging hose assembly by
pushing the quick-disconnect coupling on the
RIC/UAC charging hose assembly on to the coupling
on the respirator until the quick-disconnect sleeve
clicks into place. See
4 Slowly open the RIC/UAC charging hose assembly
valve to pressurize the supply line and begin air flow to
the cylinder.
.
5 Continually monitor the pressure gauge on the cylinder during filling. When the pressure gauge on the cylinder
reads full, immediately terminate filling and disconnect the air supply source. A check valve in the RIC/UAC
coupling on the respirator prevents air from flowing out of the cylinder.
•
If the cylinder is being filled from a portable air supply cylinder (such as a 3M Scott Fire & Safety RIT-Pak
portable air supply), the air from the supply cylinder will stop flowing when the pressure in the cylinder equals
the remaining pressure in the portable air supply (i.e., pressures will balance). Disconnect the RIC/UAC
charging hose assembly.
•
If the cylinder is being filled from a supply hose connected to a high-pressure air supply source, take extra
care to prevent over-filling the cylinder. If the supply pressure exceeds the pressure rating for the complete
respirator, the RIC/UAC relief valve will open when the 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 charging hose assembly.
TIP
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 charging hose assembly and disconnect the air
supply. The relief valve will reset after excess pressure is released.
6 When charging is complete, disconnect the RIC/UAC charging hose assembly from the RIC/UAC coupling on
the respirator.
a Pull the coupling sleeve away from the respirator until the coupling disengages.
b Install the dust caps on the RIC/UAC coupling and on the RIC/UAC charging hose assembly coupling.
7 After charging is complete, monitor the cylinder pressure on the respirator and repeat the above procedure as
needed until the respirator user can be removed from the hazardous atmosphere.
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 you are charging a cylinder in cold ambient conditions where the
temperatures are below freezing, see

Using Alternate Cylinders

If 3M Scott Fire & Safety cylinder and valve assemblies of different pressures are used in emergency situations, the
following conditions will be observed:
•
A fully charged 2216 psig rated cylinder or 3000 psig rated cylinder installed on an Air-Pak model 4.5 SCBA will
cause the remote pressure gauge to indicate less than full and the end-of-service indicator alarms will activate
well before approximately two-thirds of the air has been consumed.
P/N 595373-01 Rev C
Figure 3-21.
"Low Temperature
202004
Figure 3-21 Connecting the high-pressure charging wand
Operation" on page 34.
SPECIAL USE SITUATIONS
33