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9
ELECTRONIC FILTER CLEAN REMINDER
HFD300 & HFD310 Series
• This model air purifier has an electronic filter check to remind you when to
check the washable ifD
®
filter based on the air purifier’s hours of use.
• When the ifD
®
filters need to be cleaned, the LED light will remain on until it is
RESET. You may unplug the air cleaner without interrupting the filter check.
• You should periodically check the filter. Depending on operating conditions, the
filters should be cleaned at least once every three months.
HFD320 Series
• This model air cleaner has an electronic filter check to remind you when to
check the washable ifD
®
filter based on the air purifier’s hours of use.
• When the ifD
®
filters need to be cleaned, the LED light ‘bar’ will remain full and
the light will be illuminated until it is RESET. You may unplug the air cleaner
without interrupting the filter check.
• You should periodically check the filter. Depending on operating conditions,
the filters should be cleaned at least once every three months.
To RESET the Electronic Filter Check:
All Models
• When the filter monitor light remains on, it is time to check/clean the
ifD
®
filters and reset the filter monitor, if needed.
• After the filters have been cleaned and placed back in the unit (dry), you will
want to reset the indicator. To do this, ‘touch’ the ‘OK’ button for 2 or more
seconds until the LED light is off and the fill ‘chart’ is not illuminated.
(HFD320 series only)
Fig. 8
Fig. 9
Fig. 10
REMOVING THE FILTERS
CAUTION: Turn off the unit and wait 60 seconds before removing
the grille to clean filters.
The ifD
®
filters are supplied within the air cleaner.
• Turn-off the air cleaner. Wait 60 seconds and unplug the unit before removing
the grille. While pressing down on the notch along the rear grille, pull the grille
down and towards you and remove it (Fig. 11). Gently push along the edge of
the filter frame and pull forward. Repeat for the second filter.
• Place back into the air cleaner housing and snap filter grille back into place.
NOTE: If the odor reducing pre-filter is used in lieu of the permanent washable
pre-filter, it will need to be replaced approximately every 3 months.
Fig. 11
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