F90A,B
Cleaning the F90
The F90 removes a variety of contaminants from the air. As it cleans the air, the F90 cells and prefilters become dirty, lowering the cleaning efficiency. To maintain the F90 reliability and efficiency, regularly clean, inspect, and service the F90 cells and prefilters.
Clean cells with an alkaline base detergent solution. Soaking the cells in commercial or home electric dishwasher detergent, powder or liquid, works well. Use the hottest water possible (hotter than 160°F (71°C)). If soaking does not clean the cells, use high velocity detergent spray or steam. Full service distributors provide a regular cleaning service to commercial establishments.
The WASH LED (if used) lights when cell washing is overdue. When the WASH LED lights, wash the cells and wipe the ionizer wires. Frequent cell cleaning keeps WASH LED
from lighting.
The F90 needs servicing if it is damaged or if efficiency is substandard, if abnormal voltages are measured, or if the CHECK LED lights.
Opening the Cover and Removing the Cells and Prefilters
CAUTION
1.Before servicing the F90, turn off power to the F90.
2.When servicing the F90, stand on a stable work platform or ladder.
1.Open the cover by pulling the two latches located on the front of the cover and swinging the cover down until it hangs. See Fig. 13.
2.Remove the prefilter and the cell from the channel guides.
3.Replace the activated carbon filter (if used), if it needs replacement.
Cleaning the Prefilter
1.Shake out or vacuum the accumulated contaminants from the prefilter. If necessary, soak the prefilter in alkaline detergent solution. Do not soak the prefilter in an acid detergent solution or use high pressure water, air, or steam to clean the prefilter.
NOTE: Wash the cell before washing the prefilter. If the prefilter is washed first, lint residue from the prefilter will contaminate the wash water and deposit inside the cell. Dispose of the wash water after each use.
Cleaning the Cell Using Alkaline Base Detergent
WARNING
Hazardous Chemical.
Can cause personal injury.
Wear rubber gloves, eye protection, and a rubber apron for protection from the strong cleaning chemicals. Keep detergent solution out of reach of children.
1.Use a container such as a laundry tub or plastic tank that is large enough to hold at least one cell.
2.Mix the alkaline base detergent with hot water, carefully following the instructions on the detergent package.
•Use commercial or home electric dishwasher detergent (either powder or liquid). Do not use soap or acid base cleaners or solvents.
•Assure the water temperature is between 150°F and 190°F (66°C and 88°C).
•If using cold water detergent, follow the instructions included with the detergent.
NOTE: Cold water detergent cleans less effectively than hot water detergent.
WEAR GLOVES
TO PROTECT
HANDS FROM
DETERGENT
SOLUTION.
M922A
Fig. 14. When cleaning cell, agitate in detergent solution.
3.Carefully wipe off ionizer wires before prerinsing.
4.Prerinse the cell in hot water before submerging in detergent.
5.Soak the cell in the solution for up to 15 minutes. Agitate the cell in the solution if necessary. See Fig. 14.
6.Remove the cell from the detergent solution.
7.Place the cell in another container of clear hot water (150°F to 190°F (66°C to 88°C)) for final rinsing. Rinse the cells for five to ten minutes.
8.Remove the cell from the rinse water. Allow the cell to drain and dry before energizing. Stand cell on one corner for optimum water drainage.
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