Rp9 Prv Test; Rp10 Prv Rr - CAIRE Companion C1000 Technical & Service Manual

XI
Troubleshooting & Repair Procedures
RP9 - PRV Test
1) Remove the covers (RP4).
2) Connect the pressurizing setup to the C1000/T as shown in
Figure 9.
3) Place one drop of SNOOP on the PRV or PRV silencer.
4) Slowly pressurize the unit with gaseous oxygen by adjusting
the oxygen regulator until tiny, foam-like bubbles begin to
form to indicate that the PRV has opened. You can also lis-
ten for an audible hissing sound.
5) Verify that the PRV opens (bubbles appear on the silencer)
at a pressure less than 1.62 bar (23.5 psi).
6) If the opening pressure is not within the specified range, re-
peat the procedure. If the PRV fails to open in the specified
range a second time, replace the PRV (RP10).
7) Slowly reduce the gaseous oxygen source pressure until the
stream of bubbles begins to diminish.
8) Verify the PRV closes (bubbles begin to diminish) at a pres-
sure greater than 1.28 bar (18.5 psi).
9) If the closing pressure does not meet the acceptable
range,repeat the procedure. If the PRV fails to close at the
specified range a second time, replace the PRV (RP10).
10) Remove the pressurizing setup and reinstall the covers
(RP4).
RP10 – PRV RR
1) Remove the covers (RP4).
2) Loosen and remove the silencer from the end of the primary
relief valve (Figure 15).
NOTE: Some older models may not be equipped with a silencer.
These units may be retrofitted with a silencer, but this will require
replacing the primary relief valve.
Figure 15: Removing the PRV Silencer
3) Use a 1/2inch open-end wrench to loosen and remove the
primary relief valve while simultaneously holding the re-
lief valve adapter stationary with another 1/2inch open-end
wrench.
4) Install the PRV by reversing steps 1-3.
Figure 16: PRV Removal
NOTE: Inspect the relief valve adapter for cracks caused from
overtightening. Replace as necessary.
NOTE: Some older models contain a blue, anodized relief valve
adapter. Some of these adapters may be susceptible to cracking.
The blue relief valve adapter has been replaced by a clear ano-
dized adapter that has a longer thread engagement length.
NOTE: The primary relief circuit tubing on some older models
consists of a "pig-tailed" section of aluminum tubing. The cur-
rent primary relief circuit tube is a long, U-shaped section of alu-
minum tubing.
Companion Portable Technical Service Manual • PN 20562220 Rev B
33