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Operating Your Air Purifi er
On/Speed Control: Rotate the Speed Control knob to set the desired speed. A set-
ting of zero (0) indicates that the unit is off, one (1) is low speed, two (2) is medium
speed, and three (3) is high speed. The fan speed can be adjusted at any time.
Pre-Filter and Filter Timers
This air purifi er contains timers that indicate when the pre-fi lter and fi lter should
be changed. The timer automatically counts the number of hours that each fi lter has
been in use. When the pre-fi lter counter reaches 2000 hours (approximately three
months of use), the pre-fi lter indicator will be lit to show that the pre-fi lter should
be changed. When the HEPA fi lter counter reaches 8000 hours (approximately one
year of use), the HEPA fi lter indicator will be lit to indicate that the fi lter should be
changed. The exact life of the pre-fi lter and fi lter will depend upon the environment.
If necessary, the fi lters should be changed more frequently.
To reset the pre-fi lter or fi lter timers when one indicator (or both) is lit:
1. Change the fi lter and/or pre-fi lter as described in the Maintenance section of
the manual.
2. To reset the counter to zero hours and turn off the indicator, simply press and hold
the fi lter reset key for three seconds. If both the pre-fi lter and fi lter indicators are
lit, the reset key will fi rst turn off the pre-fi lter indicator. Then, you must release
the reset key and then press and hold the fi lter reset key again for three seconds to
turn off the fi lter indicator.
To reset the pre-fi lter or fi lter timers before the indicators are lit:
In some environments, you may want to change the pre-fi lter or fi lter more frequently
than indicated by the fi lter indicators. This procedure allows you to reset the pre-fi lter
or fi lter counter before the indicators are lit.
1. Change the fi lter and/or pre-fi lter as described in the Maintenance section of
the manual.
2. Now, you must choose which timer you want to reset. Press and hold the fi lter
reset key (approximately three seconds) until the pre-fi lter indicator fl ashes. Press
the reset key again to alternate between the two indicators. The timer that will be
reset is designated by the fl ashing indicator.
3. Once you have the correct indicator fl ashing, press and hold the reset key for three
seconds to reset that timer to zero hours. The indicator will stop fl ashing when it
has been reset. If needed, repeat these steps to reset the other timer.
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