HELiOS Portables Technical Service Manual • PN 20562190 Rev E
37
HELiOS P
or
tables
Troubleshooting & Repair Procedures
XI
RP7 – Primary Relief Valve Test
1. Remove the covers (RP4).
2. Set the container assembly on the portable test fixture (B-
778202-00).
3. Stand the front cover, with tubing still connected, next to the
container assembly as shown in Figure 19.
4. Set the flow control knob in the off position (0).
5. Attach the DISS nut end of a HELiOS oxygen supply line
(B-701656-SV) to an 0-6.90 bar (0-100 psi) source of gase-
ous oxygen.
6. Insert the opposite end of the HELiOS oxygen supply line
into the quick connect.
7. Disconnect the flexible vent tube from the barbed fitting at
the vent valve outlet.
8. Connect the test pressure gauge tube to the vent valve
barbed fitting and secure it with a tie wrap as shown in fig-
ure 28.
9. Use a 3/16 inch tubing nut (B-775067-00) or 2 inch (5.08
cm) spacer to prop the vent valve lever in the open position.
10. Place one drop of leak detector on the R/E valve bronze vent
port silencer disk shown in Figure 29.
11. Slowly increase the gaseous oxygen source pressure until
tiny, foam-like bubbles just begin to form on the surface of
the silencer disk to indicate that the PRV has opened. You
can also listen for an audible hissing sound.
12. Verify that the PRV opens at ≤1.90 bar (≤27.5 psi) on the
H300, or 1.79-2.07 bar (26-30 psi) on the H850.
13. If the opening pressure is not within the acceptable range,
repeat the PRV test. If the PRV fails to open in the accept-
able range a second time, replace the R/E valve (RP10).
14. Slowly reduce the gaseous oxygen source pressure until the
stream of bubbles begins to diminish.
15. Verify that the PRV closes (bubble begin to diminish) at a
pressure greater than 1.59 bar (23psi) for the H300, or 1.72
bar (25 psi) for the H850.
16. If the closing pressure does not meet the acceptable range,
repeat the test. If the PRV fails to re-seat in the acceptable
range a second time, replace the R/E valve (RP10).
17. Remove the test pressure gauge and nut/spacer from the vent
valve.
18. Reconnect the flexible vent tube to the vent valve barbed fit-
ting.
19. Re-install the case (RP4).
Figure 28:
Test Pressure Gauge Set-Up
Figure 29:
PRV Liquid Leak Testing
NOTE: For newer units manufactured without the CPC
Connector, the CPC Connector Kit will need to be installed,
please refer to RP27.
NOTE: If unit was equipped without CPC fitting, remove kit
and reinstall tube in reverse order of RP27.
