CAIRE HELiOS Plus Technical & Service Manual page 29

XI 1
Troubleshooting & Repair Procedures
Symptom
10) Flow stops sud-
a) Cannula is disconnected
denly on con-
tinuous setting
NOTE: For continu-
b) Cannula is blocked or kinked
ous flow to continue
a inhalation must
be detected periodi-
c)
cally. Refer to the
Theory of Operation
d)
section of this
manual for more in-
formation.
e)
f)
11) Unit flows continu-
ously on demand
a) Saturation Pressure is too high
settings
b) Faulty FCV
12) Increased NER
a) Saturation Pressure is too high
b) Leak in the system
c) Relief valve open
d)
13) Excessive Frost
NOTE: Minimal
frost on the case and
a) Frost is acceptable
on the plumbing is
normal. This symp-
tom applies to frost
that is much greater
b) High humidity level
than what is nor-
mally observed.
c) Saturation pressure is too high
d) Leak in the system
e) Relief valve open
f)
Table 6 (cont.)
Probable Cause
Cannula tips not positioned prop-
erly in the nose
Patient is breathing with their
mouth open.
Saturation pressure is out of
specification
Faulty FCV
Partial or complete loss of vac-
uum
Partial or complete loss of vac-
uum
Corrective Action
Ensure the nasal cannula is firmly attached to the barb(s). Must be
using a dual lumen cannula connected to both ports.
Inspect the cannula for kinks, bends, or water droplets. Replace
the cannula if necessary.
Ensure the cannula remains in the nostrils and do not slide to one
side.
Patient must inhale through their nose to initiate continuous flow.
Reference symptom 14. Inspect the saturation pressure of the res-
ervoir used for filling. Allow at least 30 minutes at no flow for the
portable to saturate properly.
Test the FCV (RP19) and replace (RP20) 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.
Test the FCV (RP19) and replace (RP20) 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.
Perform a leak check on the plumbing (RP2). Repair leaks as nec-
essary.
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 (RP22) 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 during continuous use. This is due to
the evaporation of LOX to gas and the temperature difference be-
tween 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 (RP2). Repair leaks as nec-
essary.
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 (RP22) and return the unit to CAIRE, Inc. if
necessary.
HELiOS Portables Technical Service Manual • PN 20562190 Rev E
28