Rp8 Secondary Relief Valve Test - CAIRE HELiOS Plus Technical & Service Manual

XI
Troubleshooting & Repair Procedures
RP8 – Secondary Relief Valve Test
1. Remove the covers (RP4).
2. Set the container assembly on the portable test fixture.
3. Place the front cover, with tubing still connected, next to the
container assembly as shown in Figure 19.
NOTE: Note: For newer units manufactured without the CPC
Connector, the CPC Connector Kit will need to be installed,
please refer to RP27.
CAUTION: Disconnect and clamp off the demand flow
control valve oxygen inlet tube before performing the
secondary relief valve test. High test pressure can damage
the FCV.
4. Disconnect the 1/16 in (0.15 cm) diameter urethane tube
from the demand flow control valve inlet barbed fitting
(toward the front of the valve). Clamp the inlet tube with a
tubing clamp or hemostat.
inlet
fitting
Figure 30: Disconnecting the FCV Inlet Tube
5. Set the flow control knob in the off position (0).
6. Attach the DISS end of a HELiOS oxygen supply line
(B-701656-SV) to a 0-6.90 bar (0-100 psi) source of gaseous
oxygen.
7. Insert the opposite end of the HELiOS oxygen supply line
into the quick connect on the front cover.
8. Disconnect the flexible vent tube from the barbed fitting at
the vent valve outlet.
9. Connect the test pressure gauge tube to the vent valve
barbed fitting as shown in Figure 28 and secure it with a tie
wrap.
10. Use a 3/16 in (0.48 cm) tubing nut (B-775067-00) or 2 in
(5.08 cm) spacer to prop the vent valve lever in the open po-
sition.
11. Obtain a 6 in (15.24 cm) micro clamp bar and size 00 rubber
stopper. Trim the rubber stopper so that it is about 0.5 in
(1.27 cm) long. Place the smaller end of the rubber stopper
over the R/E valve vent port. Position the bar clamp station-
ary arm on the larger end of the stopper and the moveable
arm on the R/E valve body. Tighten the clamp to seal the
vent port.
Figure 31: Bar Clamp Sealing the R/E Port
12. Slowly pressurize the H300 or H850 by adjusting the gase-
ous oxygen source regulator.
13. Verify that the secondary relief valve opens (audible hiss) at
5.24-5.79 bar (76-84 psi).
NOTE: If the SRV opens at a pressure slightly higher than the
SRV setting, reduce the oxygen source pressure to 3.45 bar (50
psi). Release the tubing clamp or hemostat until the pressure
in the H300 or H850 drops to 3.45 bar (50 psi). Re-clamp the
inlet tube and repeat the test a second time. If the SRV fails the
test again, replace the SRV (RP11).
14. Slowly reduce the pressure of the gaseous oxygen source
hemostat
until the audible hissing noise is no longer heard.
clamp
15. Verify that the SRV closes (audible hiss no longer heard) at
a pressure greater than 4.41 bar (64 psi).
NOTE: If the SRV does not close within this range the first
time, repeat the SRV test. If it fails to close within an acceptable
range the second time, replace the SRV (RP11).
16. Reduce the oxygen source pressure to 0 bar/psi and discon-
nect the HELiOS oxygen supply line from the quick connect
on the front cover.
17. Disconnect the test pressure gauge from the vent valve and
vent the pressure in the unit through the open vent valve.
18. Connect the flexible vent tube to the vent valve barbed fit-
ting and remove the nut or spacer propping the vent lever
open.
19. Remove the bar clamp and the tubing clamp/hemostat.
20. Connect the urethane tube to the FCV.
NOTE: If unit was equipped without CPC fitting, remove kit
and reinstall tube in reverse order of RP27.
21. Re-Install the covers (RP4).
HELiOS Portables Technical Service Manual • PN 20562190 Rev E
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