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41674-01 12
Operation
Filter Run-Time Counters
The pre-filter and filter are critical to the proper operation of the air purifier. To help you
know when to change the filters, your Hunter Air Purifier has Filter Run-Time Counters that
will monitor the number of hours your filters have been in use. Although the exact life of the
filters depends on the environment, the table below gives typical usage times of the filters.
Table 2: Typical Usage Times of the Filters
To check the run-hours for each filter:
1. Press the DISPLAY key to toggle among the 3 display modes – Clock, Pre-Filter,
and Filter. The Filter or Pre-Filter indicator will illuminate when the run hours
for that filter are displayed.
2. The display shows the number of run hours since the counter was reset.
Although the maximum display value is 9,999 hours, the counters can go indefinitely. To
indicate that the counter is over 9,999 hours, the display will flash. For example, a run time
of 12,000 hours is represented by a flashing 2,000 hours.
The values of the Pre-Filter and Filter Counters are stored in the air purifier’s memory.
The unit may be unplugged and moved without losing the pre-filter and filter counter
values.
To properly track filter usage, the Pre-Filter and Filter Counters should be reset each time
the filters are changed. Refer to Changing the Pre-Filter (pg. 19) or Changing the Filter (pg.
20) for instructions on how to reset the counters.
Filter Type Typical Usage
Activated Carbon Pre-Filter 2000 hours
HEPA Filter 8000 hours
DISP
41674-01_REV 3-11-05.pmd 3/11/05, 5:01 PM12