CAIRE HELiOS Plus Technical & Service Manual page 34

XI
Troubleshooting & Repair Procedures
Figure 20: Pressurizing the HELiOS Portable
9. Repair or replace any fittings, connections, or components
found to be leaky.
CAUTION: Do not apply leak detector to the vent port near the
bottom of the demand flow control valve. Valve malfunction
will occur.
10. Wet a finger with leak detector and lightly place it against
the open end of the vent tube near the bottom of the unit as
shown in Figure 21. If bubbling occurs, verify that the vent
valve closes completely. If bubbling continues, replace the
vent valve (RP15).
NOTE: Continually monitor the test pressure gauge while
leak checking the unit to verify that the pressure in the system
remains above 1.52 bar (22 psi).
11. Disconnect the HELiOS oxygen supply line from the quick
connect on the front cover.
12. Insert an open-ended HELiOS oxygen supply line coupling
(B-701686-00) into the quick connect on the front cover.
Figure 21: Vent Outlet Leak Testing
13. Wet a finger with leak detector and lightly place it against
the open end of the coupling as shown in Figure 22. If bub-
NOTE: Steps 11-13 are not required for newer units
manufactured without the CPC Fitting.
bling occurs, replace the inline check valve (RP24).
14. Disconnect the test pressure gauge and the HELiOS oxygen
supply line.
15. Reinstall the case (RP4).
NOTE: This is not required for newer units manufactured
without the CPC Fitting.
Figure 22: Inline Check Valve Leak Test
NOTE: A large leak in the check valve may bleed down the
pressure before you can insert the coupling for the bubble test.
You will typically hear gas escape from the quick connect
when there is a large check valve leak. Verify that 22psi still
reads on the pressure gauge.
NOTE: If unit was equipped without CPC fittung, remove kit
and install tube in reverse order of RP27.
HELiOS Portables Technical Service Manual • PN 20562190 Rev E
33