CAIRE Liberator G4 Series, Technical & Service Manual

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Lib
er
at
ors
XI
Troubleshooting Charts
Symptom Probable Cause Corrective Action
1)
Unable to start fill
or excessively
l ong fill times
a)
Transfer line not engaged fully on
Reservoir QDV
Make sure the QDV on the transfer line and reservoir are properly aligned and ensure
that a downward force is being applied to the transfer line assembly.
b)
Low source pressure
Verify that pressure from the source is within the 35-50 psi range to fill the
reservoir.
c)
Vent valve not open or is blocked Ensure that the vent valve is able to be turned to the fully open position.
d) Allow LOX to saturate to proper pressure.
e) Fill connector not opening
properly
Check fill connector and cartridge assembly for damage; make sure fill
connectors fully engage.
f) Vent valve is obstructed
Inspect the valve for blockages and verify that flow passes through during a fill.
Clean by blowing out with compressed gas or replace parts if necessary.
g)
Leak in the system Check the reservoir for leaks (RP16) and repair if needed.
2) Liquid leaks from
the coupled QDVs
during the fill
a) Worn or damaged lip seal Replace the QDV lip seal (RP19)
3) Unable to
disconnect the
transfer line
from the
reservoir after
a fill
a) Pop-off assembly not being utilized
(Does not apply to Liberator 10)
Ensure that the pop-off assembly on t he reservoir is being used. Do not use
force to separate the QDVs.
b) QDVs are frozen together
Leave the units coupled with the vent valve closed and let them sit until they
warm up enough to disconnect. Always ensure that male and female QDV’s are
cleaned and dried prior to each fill.
4)
Liquid leaks from
the QDV poppet
after f illing
a)
Ice crystal preventing the QDV
from closing properly.
Engage and disengage the transfer line onto the reservoir several times to dislodge the
ice crystal . Always be sure that the male and female QDVs are wiped clean and dry
before filling.
b) Dirty or damaged QDV p oppet
Replace the QDV cartridge (RP20) or the entire QDV assembly (RP21)
5) Excessive venting
from relief valves
(hissing sound)
a) Saturation pressure too high.
Inspect the saturation pressure of the reservoir used for filling. Allow at least
30 minutes at no flow for the portable to saturate properly.
b) Relief valve frozen open Allow the portable to warm and thaw. Attempt to re-fill the portable.
c)
Faulty relief valve Test the relief valve (RP13) and replace if necessary (RP14)
d)
Partial or complete loss of vacuum Conduct the NER test (RP32) and return the unit to CAIRE, Inc. if necessary.
6) No flow at
oxygen outlet
a) Reservoir is empty Check the contents indicator/level gauge and fill the reservoir if needed.
b) Flow control valve turned off Ensure the flow control knob is not in the off (“0”) position.
c)
Nasal cannula kinked or disconnected Ensure proper nasal cannula functionality and positioning
f) Leak in the system Perform a leak check on the plumbing (RP16). Repair leaks as necessary.
g) Relief valve is open Ensure that there is no venting from the relief valves. If there is refer to the
corrective actions for “Excessive venting from relief valves (hissing sound)” .
h) Vent valve is open Ensure that the vent valve is fully closed.
i)
FCV inlet filter is obstructed Clean or replace (RP30) the filter screen.
j)
Blockage i n the liquid withdrawal circuit
Check the warming coils and withdrawal tubes for blockages. Replace if necessary.
k) FCV Faulty Replace the FCV (RP30)
7) Low flow at oxygen
outlet on all LPM
settings
a)
Nasal cannula kinked or leaking
Inspect the functionality of the nasal cannula.
b)
Saturation pressure is too low Inspect the saturation pressure of the reservoir. Allow at least 30 minutes at
no flow for the reservoir to saturate properly.
c) Leak in the system Perform a leak check on the plumbing (RP16). Repair leaks as necessary.
Source tank is either under
or over-saturated
Liberators Technical Service Manual • PN 13350704 Rev K
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