Filter
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41674-01 20
Air Purifier Maintenance
6. Install the grill back onto the unit. First, line up the tabs on the bottom of the grill
with the openings on the purifier base and then push the top of the grill forward
until it is closed.
7. Plug in the air purifier. NOTE: This unit will not oper-
ate unless the grill is in the correct position. The display
will read “door” if the grill is not attached properly.
8. Finally, reset the pre-filter counter by pressing the
DISPLAY key until the pre-filter counter is displayed.
Then, hold the FILTER RESET key for 2 seconds. The
pre-filter counter will return to zero and resume nor-
mal operation.
Changing the Filter
When the Filter Counter exceeds 8000 hours (approximately 1 year of use), the display
will automatically switch to the Filter Display and the Filter indicator will flash (refer to
Filter Run-time Counters for additional information pg. 12). This is a reminder that you
should check the filter and replace if necessary. The proper time to change the filter depends
upon usage and the environment. Use the following list to help determine if the filter should
be changed:
• Compare the color of the filter to the color coded chart on the inside of the housing. If the
filter color matches the darkest color on the chart, you should replace the filter.
• If you notice a decrease in air output or an increase in noise at any time during normal
operation, the filter may be clogged. Replace the filter to return to normal operation.
To change the filter and reset the filter run-time counter:
1. First, turn off and unplug the air purifier.
2. Next, remove the front grill. Place your fingers in the recesses on either side of
the top of the grill and pull firmly.
3. Gently pull on the filter to remove it from the unit. While removing the
filter, note the direction of the arrows on the top of the filter. The new filter
will be installed with the same orientation. Once removed, the used filter can
be discarded.
4. Remove the new filter from its wrapping. The arrows on the top of the filter
should be pointing towards the air purifier. Place the filter into the air purifier
and press the filter firmly into place. To avoid damaging the filter media, you
should press on the frame of the filter only.
5. Reinstall the grill by first lining up the tabs on the bottom of the grill with the
openings on the air purifier base and then pushing the top of the grill forward
until it is closed.
Fig. 27
DISP
FILT
RST
41674-01_REV 3-11-05.pmd 3/11/05, 5:01 PM20