F90A,B
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.
REPLACING AN IONIZER WIRE.
SPRING |
CONNECTORS |
PRESS |
DOWN |
EYELETS IONIZER
WIRE
1
IONIZER
WIRE
NEEDLENOSE
PLIERS
1 TWO EYELETS HOLD IONIZER WIRE TO CELL. | M1540B |
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.
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