CAIRE HELiOS Marathon H850 Home Use Manual page 25

How To Use Your H850 Personal Oxygen System
push down
and hold
Figure 2: Filling the H850 Portable
Note: Fill time is usually between 60 and 80 seconds
WARNING: Do not leave the H850 Portable unattended
during the filling operation.
7. When you notice a change in the sound of venting gas
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when the H850 Portable is empty. The amount of
time to fill the H850 Portable depends on the
amount of oxygen remaining in the H850 Portable.
followed by a dense, white vapor forming around the
Reservoir cover, close the H850 Portable vent valve
by returning the vent lever to the upright position.
vent valve
H850 Home Use Guide