CAIRE HELiOS Marathon H850 Use Manual page 22

Using Your HELiOS Marathon H850 Portable Oxygen Unit
6. Pulling down and holding vent valve
Caution
Do not allow the portable oxygen unit to move upward
until fill is complete.
Note:
When the portable oxygen unit is empty, it may take as
long as four minutes to fill. The amount of time to fill the
portable oxygen unit depends on the amount of oxygen
remaining in the portable oxygen unit and on the
pressure in the reservoir.
7. Closing the valve—When the sound of venting
Caution
If the vent valve fails to close and the hissing continues,
remove the portable oxygen unit by pressing the
portable oxygen unit release button on the reservoir.
Keep the portable oxygen unit upright and do not tip at
all during this time. The portable oxygen unit will stop
venting in a few minutes. Allow the portable oxygen
unit to warm until you can close the vent valve. The
portable oxygen unit may require as much as 60
minutes to restore adequate pressure for accurate
oxygen flow. If necessary, use an alternate source of
oxygen such as an external flow control device,
18 HELiOS Marathon
lever—While holding the portable oxygen unit
in the fill position, pull down and hold the vent
valve lever in the open position (90° from the
normal OFF position). Listen for a hissing noise.
Maintain a constant downward pressure on the
portable oxygen unit with the hand on top to
keep the portable oxygen unit steady, and
maintain proper filling position. See Holding the
Vent Valve Lever, Figure 7.
gas changes, and a dense, white vapor begins
forming around the reservoir cover, close the
portable oxygen unit vent valve by returning the
vent lever to the upright position.
B-701655-00. See Accessories, page 47.
TM
H850 Portable Oxygen Unit Home Use Guide