Specifications
25Routine Maintenance
Chapter 11 Routine Maintenance
Refer to the BiPAP System Service Manual for more complete maintenance information
and requirements.
Changing the Filter
Caution: Failure to replace a dirty filter may cause high operating temperatures, reduce flow, and
reduce the output pressure of the BiPAP unit.
The white filter on the front of the unit is disposable and must be replaced after thirty days of use or
sooner if it seems especially dirty.
1. See Figure 22. Press down (1) and pull out (2) on the
top of the Whisper Cap
®
. You need to press down
only about
1
/
8
” to allow the top lip of the Whisper
Cap to clear the filter retainer.
2. Pull up (3) on the bottom of the Whisper Cap until the
bottom lip clears the filter retainer.
3. Turn OFF (0) the unit and unplug the electrical cord
from the wall outlet and from the back of the unit.
4. See Figure 23. Locate the button in the center of the
filter holder beneath the surface of the filter. Push in
on the button and pull the filter out from all four
sides of the filter holder.
5. Throw away the dirty filter. The filter is not washable.
6. See Figure 24. Center a new filter over the filter holder. Care-
fully push in on the center button and tuck the filter in on all
four sides.
7. Release the button. The filter should be intact and fit securely,
covering the entire holder. Remove and readjust the filter, if
necessary.
8. Insert the bottom lip of the Whisper Cap behind
the inner bottom edge of the filter retainer.
9. Simultaneously press down on the top of the Whisper Cap
and push in until the top lip of the Whisper Cap snaps into
place behind the inner top edge of the filter retainer.
10. Press in on the center of the Whisper Cap to ensure that the
Cap is seated in the filter retainer.
The filter must be in place at all times when the
BiPAP S/T System is being used.
Figure 22
I
0
®
®
Whisper
Cap
Cap
™
1
Press
down
3
Pull
up
Pull
out
2
BiPAP
®
S/T
Figure 23
®
®
I
0
Push
Pull
Button
i
i
P
B
AP S/T
Ventilatory Support System
®
Figure 24
®
®
I
0
Push
Tuck
i
i
P
B
AP S/T
Ventilatory Support System
®