CAIRE HELiOS Marathon H850 Use Manual page 46

Troubleshooting
3. Excessive frost and hissing.
WARNING
Do not touch liquid oxygen or parts that have been
in contact with liquid oxygen. Liquid oxygen is
extremely cold (-297 °F / -183 °C). When touched,
liquid oxygen, or parts of the equipment that have
been carrying liquid oxygen, can freeze skin and
body tissue.
4. Portable oxygen unit stops pulsing during use.
42 HELiOS Marathon
a. Some hissing and frosting on the portable
oxygen unit is normal. If, however, the hissing
continues after a fill or anytime during usage and
there is excessive frosting on the portable oxygen
unit, stop using the portable oxygen unit and
contact your homecare provider for service.
b. Excessive frost formation on the portable oxygen
unit 30 minutes after a fill while the Flow Control
knob is in the OFF position may be a result of
possible system malfunction. Stop using the
portable oxygen unit and contact your homecare
provider for service.
a. Verify there is sufficient oxygen in the portable
oxygen unit.
b. Check your flow setting and make sure it is set to
a Demand Mode (D1.5 to D4) setting.
c. Ensure both connections of the dual-lumen
cannula are firmly attached to the oxygen outlet
and sensor connectors.
d. Change the cannula if excessive water droplets
are present, since this reduces oxygen flow.
Replace the cannula with a dry one, which should
enable the portable oxygen unit to pulse.
e. Verify the cannula is not kinked or pinched.
f. Check the cannula. Ensure the cannula tips
remain in your nostrils and do not slide to one
TM
H850 Portable Oxygen Unit Home Use Guide