CAIRE Hi Flow Stroller Technical & Service Manual page 20

X
Troubleshooting Chart
Symptom
9) Increased NER
10) Excessive Frost
NOTE: Minimal frost
on the case and on the
plubming is normal,
especially at higher flow
rates. This symptom
applies to frost that is
much greater than what
is normally observed.
11) Unit will not maintain
acceptable pressure
when in use
Probable Cause
a) Saturation Pressure is too high
b) Leak in the system
c) Relief valve open
d) Partial or complete loss of
vacuum
a) Frost is acceptable
b) High humidity level
c) Saturation pressure is too high
d) Leak in the system
e) Relief valve open
f) Partial or complete loss of
vacuum
a) Saturation pressure is unaccep-
table
b) Leak in the system
c) PRV faulty
Corrective Action
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
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)"
Conduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.
Some frost on the outer case and on the plumbing is acceptable,
especially at high flow rates. This is due to the evaporation of
LOX to gas and the temperature difference between the LOX
and room temperature.
High humidity levels can increase frost accumulation.
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
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)"
Conduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
Test the operating pressure (RP25) and replace the relief valve if
necessary (RP22).
Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F
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