FIG 3-1
FIG 3-2
FIG 4
Routine Care & Maintenance
1. Filter replacement and maintenance schedule
Filters need to be replaced or maintained properly to maximize the unit’s performance.
Maintenance schedule is based on pollution level. Following is the recommended maintenance schedule
for most environments. Filters need to be replaced/cleaned more often if unit is being used in a heavily
polluted environment:
2. Filter replacement and maintenance
Replaceable VOC pre-filter - replace every 6 months
Cleanable Poly Mesh Pre-filter and High Energy Grid - clean every 3 months
Main filter - replace every 9-12 months
VOC post-filter - replace every 6 months
WARNING: When DFS needs service, dirt in the high energy grid can create a short circuit. The
power supply PCB shuts off and the RED indicator turns on. Turn the unit off and unplug it; then
perform maintenance as indicated in the
Filter replacement and maintenance
section below.
WARNING: The unit should be turned off, unplugged and the motor should completely stop
before any maintenance.
2-1 Pre-filter set maintenance
• Remove the front cover of main unit by grabbing both sides of about 1/3 of the distance from
the bottom and pulling the bottom part away from the main body of the unit. (Fig 3-1)
• When the bottom of the front cover is a few inches away from the main body, use both
hands to pull the front cover down slowly to disable child lock on top of the front cover. (Fig 3-2)
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