Rp20 Fcv Rr; Rp21 Back Flushing The Fcv; Rp22 Operating Pressure Test - CAIRE Companion C1000 Technical & Service Manual

XI
Troubleshooting & Repair Procedures
RP20 – FCV RR
WARNING: Liquid oxygen discharge from the FCV can occur
if a 0-15LPM C1000T FCV is installed on a C1000. Always
check the flow rating decal on the FCV before installing the
valve on a portable. DO NOT install a 0-15LPM valve on a
C1000.
1) Remove the top bezel (RP5).
2) Use a 1/2 inch open-end wrench to loosen the 3/16inch tube
nut on the back of the flow control valve. Remove the tube
and nut from the flow control valve.
3) Use a 1/16 inch Allen wrench to loosen the set screw in the
flow control valve knob. Remove the flow control valve
knob and decal. If the knob does not use a set screw, insert
the Allen wrench into the hole in the knob. Simultaneously
push in and pull up on the Allen wrench to remove the knob.
4) Use a small flat-blade screwdriver to loosen and remove the
two flat-head screws from the flow plate. Remove the flow
plate and the flow control valve.
5) Use a dental pick or similar tool to carefully remove the in-
let filter screen from the flow control valve. Be careful not
to scratch any part of the flow control valve inlet port when
removing the screen (Figure 26).
6) Install the FCV by reversing steps 1-5.
Figure 26: Removing the Filter Screen
Figure 27: FCV Assembly
RP21 – Back Flushing the FCV
1) Remove the FCV (RP20) and its filter screen.
2) Temporarily reinstall the oxygen outlet barbed fitting in the
flow control valve. Connect 3.45-5.18 bar (50-75 psi) oxy-
gen to the valve's outlet barbed fitting. Temporarily install
the valve knob on the rotor shaft.
3) Slowly rotate the valve knob through all flow settings
(Figure 28). Gas flow should be audible at each flow posi-
tion, indicating that the appropriate orifice is open.
Figure 28: Backflushing the FCV
RP22 – Operating Pressure Test
1) Fill the C1000/T with liquid oxygen from a properly satu-
rated reservoir.
2) Attach the test pressure gauge w/ tubing (B-701732-00) to
the cannula outlet barb on the top of the C1000/T.
3) Open the FCV to the highest flow setting.
4) Read the operating pressure on the gauge. The pressure
should be between 1.28 – 1.62 bar (18.5 – 23.5 psi).
Companion Portable Technical Service Manual • PN 20562220 Rev B
39