URC ASSEMBLY OPERATION
The URC (Universal Rescue Connection) Assembly is a
male quick-fill inlet for use by Rapid Intervention Crews
for emergency filling operations. The system also includes
an automatically resetting pressure relief valve. The SCBA
can also be equipped with a shoulder-mounted Quick-Fill
System, unless using a 3000psi URC Assembly, the
3000psi URC Assembly cannot be used with Quick-Fill
System.
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) approved SCBA cylinder simulta-
neously; doing so will void NIOSH approval. Failure to
follow the above warnings may result in serious per-
sonal injury or death.
The URC Assembly must be used by trained Rapid
Intervention Crews only using procedures developed
for rapid intervention. Improper use can result in seri-
ous personal injury or death.
Note:
The URC Assembly may be used for transfill opera-
tions as described in this manual. Standard operating pro-
cedures should be developed for use of the URC
Assembly or Quick-Fill System.
An air mask using the 3000psig URC Assembly with-
out Quick-Fill System can receive (be a Receiver)
cylinder pressure through the 3000psig URC
Assembly. Do not use air mask with Quick-Fill System
and 3000psig URC Assembly on the same air mask.
Air mask with Quick-Fill System and 3000psig URC
Assembly on same air mask will not allow the relief
valve in the 3000psig URC Assembly to open as
designed. Failure to follow the above warnings may
result in serious personal injury or death.
The URC Assembly must be used only by qualified,
trained personnel who have carefully read and understood
these instructions, cautions, and warnings. NIOSH
approvals of SCBA from MSA are maintained while trans-
filling air ONLY if appropriate Quick-Fill hose assemblies
from MSA are used. URC Assembly or Quick-Fill hose
assemblies and fittings are rated for a maximum working
pressure of 4500psig.
NIOSH approval is maintained only when using the follow-
ing hose assemblies:
485331, 802687, 802688, 802689, 802690, and 48332, for
filling cylinders in IDLH atmospheres.
DO NOT Transfill (be a Donor) using a 3000psi URC
Assembly. The 3000psi URC Assembly has a check
valve that does not allow cylinders to Transfill (be a
Donor). Using the 3000psi URC Assembly to fill cylin-
ders, 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. Failure to follow the above warnings
may result in serious personal injury or death.
For filling operations using the URC Assembly, do not
use any transfilling hose assembly or fittings other
than those supplied by MSA specifically for the URC
Assembly or Quick-Fill System. Use of any other
transfilling hose assembly, fitting, or cylinder may
result in serious personal injury or death, and will void
NIOSH approval. Failure to follow the above warning
may result in serious personal injury or death.
DO NOT lubricate the URC Assembly fittings. Do not
permit oil, grease, or other contaminants to come in
contact with the Quick-Fill fittings. The Quick-Fill hose
assemblies and fittings are designed to be used with
Quality Verification Level (Grade) D or better air as
defined by ANSI/CGA G-7.1. TRANSFILLING AIR FROM
A SECONDARY AIR SOURCE. Failure to follow the
above warnings may result in serious personal injury
or death.
A secondary air source stores compressed breathing air
until needed to refill SCBA air cylinders. Secondary air
source pressure must be greater than air mask cylinder
pressure. Examples of air sources include: cascade air
cylinder refilling systems; high pressure compressor sys-
tems with a fixed reservoir; and an SCBA air cylinder
which is not installed on an SCBA.
DO NOT connect a High Pressure SCBA to a sec-
ondary air source with a pressure greater than
4500psig. The high pressure air mask is rated for a
maximum working pressure of 4500psig. Failure to fol-
low the above warnings may result in serious personal
injury or death.
21
TAL 709 (L) Rev. 4 - 10058881
