Hi Flow Stroller Technical Service Manual • PN 14314465 Rev
F
19
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Troubleshooting Chart
X
Symptom
Probable Cause
Corrective Action
9) Increased NER
a) Saturation Pressure is 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) Leak in the system
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
c) Relief valve 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)”
d) Partial or complete loss of
vacuum
Conduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.
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.
a) Frost is acceptable
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.
b) High humidity level
High humidity levels can increase frost accumulation.
c) Saturation pressure is 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.
d) Leak in the system
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
e) Relief valve 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)”
f) Partial or complete loss of
vacuum
Conduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.
11) Unit will not maintain
acceptable pressure
when in use
a) Saturation pressure is unaccep-
table
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) Leak in the system
Preform a leak check on the plumbing (RP18). Repair leaks as
necessary.
c) PRV faulty
Test the operating pressure (RP25) and replace the relief valve if
necessary (RP22).
