URC ASSEMBLY OPERATION
PRECAUTIONS FOR USING URC ASSEMBLY
1. The URC Assembly can only be used to fill approved
SCBA cylinders.
2. The URC Assembly is not to be used as a "Buddy
Breather" such that two (2) users are sharing the air
supplied by one (1) SCBA cylinder simultaneously
doing so will void NIOSH approval.
3. The user is responsible for the air source, which must
meet the requirements of Compressed Gas
Association Specification ANSI/G-7.1, Quality
Verification Level (Grade) D Gaseous Air or better, with
a moisture dew point of not greater than -65°F
(24ppm water vapor, normal). Pressures at the inlet of
the Quick-Fill System hose must not exceed that of
the SCBA (2216psig or 4500psig).
4. Using the 3000psi URC Assembly to fill cylinders, the
cylinder can only be filled to 2216psig. If the pressure
exceeds 2216psig a relief valve in the URC Assembly
will vent at approximately 2525psig or as low as
2400psig. A 3000psig cylinder can only be filled to
3000psig by using a secondary air source; the 3000psi
URC Assembly cannot be used for filling a 3000psig
cylinder.
5. The user also is responsible for connecting the Quick-
Fill hose to an appropriate secondary air source.
6. The cylinder must be inspected for damage before
charging.
7. If filling cylinders in fresh air using the URC Assembly
topping off the cylinder is recommended after the
cylinder has cooled from initial fill. Topping off a cylin-
der after it has cooled will ensure proper service time.
FILLING INSTRUCTIONS FOR USING THE URC
ASSEMBLY
For Rapid Intervention Crews:
Rapid Intervention Crews should use a separate air
supply such as MSA’s RescueAire™ portable air sup-
ply system to fill SCBA in a IDLH atmosphere.
1. To connect the URC Assembly to the Quick-Fill
System hose (P/N 485391 URC Assembly or Quick-Fill
System fitting installed on the air source):
a. Push the female fitting on the male fitting until it
snaps in place. Pull on the hose to be sure the fit-
ting snapped into place.
b. Turn the air source on.
If there are leaks from either female fitting, or along
the hose, depressurize the hose and correct the prob-
lem. Such leakage can result in increased fill time.
2. To attach the Quick-Fill System hose to the URC
Assembly:
a. Remove the rubber dust cap from the male inlet fit-
ting on the URC Assembly. Be sure that the cylinder
valve is fully opened.
b. Remove the rubber dust cap from the female fitting
on the Quick-Fill System hose.
c. Push the female fitting on the male fitting until it
snaps in place.
d. Pull on the hose to be sure the fitting snapped into
place. Filling begins when the female fitting is
snapped on the URC Assembly.
If serious leakage is noticed from either of the two
female fittings, or anywhere along the hose, discon-
nect the female fittings and return to fresh air immedi-
ately. Failure to follow this warning may result in seri-
ous personal injury or death.
Note:
If the secondary air source does not have a suffi-
cient volume of air, the SCBA cylinder will not reach full
service pressure. After approximately 45-60 seconds,
pressure between the secondary air source and the SCBA
cylinder will be equal.
Cylinder temperature will increase by approximately
45°F. The pressure gauge may show FULL immediately
after transfilling, but cylinder pressure may decrease
by as much as 190psig after the cylinder cools to
room temperature. Actual service time may be
reduced accordingly.
3. Compare the SCBA pressure gauge or ICM Unit read-
ing to the secondary air source pressure gauge read-
ing. If the readings are the same, pressure is equal.
4. To disconnect the Quick-Fill System hose after trans-
filling, pull the gray sleeve back. The hose fitting and
the URC Assembly will separate. A hiss or pop may
be heard as the fittings separate and the high-pres-
sure air is sealed off.
5. Immediately install the dust cover on the URC
Assembly male fitting.
6. The SCBA cylinder is ready for service if the cylinder
pressure gauge is on the corresponding color band.
URC ASSEMBLY EMERGENCY OPERATIONS
NIOSH DOES NOT approve the use of the URC
Assembly to transfer air from the cylinder of one
SCBA to another SCBA. Failure to follow the above
warnings may result in serious personal injury or
death.
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TAL 709 (L) Rev. 4 - 10058881
