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F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER
68-0103-6 Revised 11-07
15
HIGH VELOCITY
DETERGENT SPRAY
STEAM
M677B
Fig. 15. Using high velocity water or steam to clean cells.
6. Slide the cells into the channel guides until they touch
the backstop of the F90. Assure the cell airflow arrow is
pointing toward the fan. In this position, the ionizer
wires are facing downward (away from the fan).
7. Slide the prefilters into the channel guides until they
touch the back of the channels.
8. Swing the cover up until it closes, engaging the two
latches. See Fig. 13.
Replacing Ionizer Wires
Broken or bent ionizer wires can cause an electrical short to
ground, often resulting in visible arcing or sparking. Do not
use cells until broken wires are removed. Cells can be used
temporarily with one wire missing, but replace the wire as
soon as possible. Replacement wires are supplied cut to
length with eyelets on both sides for easy installation. Order
part no. 136434AA. To install:
1. Hook the eyelet on one end of the wire over the spring
connector on one end of the cell. See Fig. 17. Be
careful to avoid damaging the spring connector or other
parts of the cell.
2. Hold the opposite eyelet with a needlenose pliers and
stretch the wire the length of the cell. Depress the
opposite spring connector and hook the eyelet over it.
3. Check the cell for short circuits using an ohmmeter.
See Fig. 18. Check the resistance between the frame
of the cell and both the ionizer and the collector
contacts. In each case, the resistance should be
infinite.
Modifying to Reduce Ozone Odor
In normal operation, the F90 generates a trace amount of
ozone that is considerably under the limit prescribed by the
U.S. Food and Drug Administration (FDA). During the first
week or two of operation, the amount may be higher because
of sharp edges on some of the new high voltage metal parts.
Normal use dulls these edges in a short time.
M1541
Fig. 16. Reinstalling F90 cells.
M1540B
IONIZER
WIRE
IONIZER
WIRE
NEEDLENOSE
PLIERS
SPRING
CONNECTORS
PRESS
DOWN
EYELETS
REPLACING AN IONIZER WIRE.
TWO EYELETS HOLD IONIZER WIRE TO CELL.
1
1
Fig. 17. Installing new ionizer wire.
A person with an average sense of smell can detect the odor
of ozone indoors in concentrations as low as 0.003 part per
million (ppm). OSHA workplace regulations permit up to
0.100 ppm ozone concentration. The F90 contributes 0.005
to 0.010 ppm of ozone to the indoor air. The U.S. FDA and
Health and Welfare Canada recommend that indoor ozone
concentration should not exceed 0.050 ppm. As a
comparison, the outdoor ozone level in major cities is
sometimes higher than 0.100 ppm.