F90A,B
If desired, the ozone generated by the F90 can be reduced in one of two ways:
• Install the optional activated carbon filters.
• Open the cover and move the F90 performance switch to the LO setting. Close the cover. With the switch in LO, the cleaning efficiency is reduced 5 to 15 percent, depending on airflow.
NOTE: The performance switch must be set solidly in either HI or LO position and not between, or the F90 may not function properly. See Fig. 19.
ELECTRICAL
TROUBLESHOOTING
WARNING
Electrical Shock Hazard.
Can cause personal injury or equipment damage. 1. Electrical troubleshooting must be performed by
only qualified personnel.
2. The following procedures expose hazardous levels of electrical current. Disconnect the power supply between checks and proceed carefully.
Tools And Equipment
Troubleshooting the F90 requires:
• Needlenose pliers for stringing ionizer wires and inserting edge connectors.
• Test meter with 15 kVdc probe.
Troubleshooting Procedure
The F90 troubleshooting charts quickly isolate F90 problems. See Fig. 20. If removing power box, follow instructions below. See Fig. 21. For the F90 schematic diagrams, see Fig. 22 through 25.
Removing The Power Box
Open the power box and remove the power supply assembly as follows:
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 guide.
3. Loosen the screws holding the power supply assembly cover plate and remove the cover plate. See Fig. 21.
AB
COLLECTOR
TERMINAL
IONIZER
TERMINAL
COLLECTOR
TERMINALIONIZER CONTACT
COLLECTOR
CONTACT
THE FRAME OF
THE CELL SERVES
AS GROUND
M921A
Fig. 18. Checking cells for short circuits.
3.Loosen two screws on inner wall of power supply assembly and three screws on the top of the assembly. Slide the power supply assembly toward the center of the air cleaner and disconnect the two Molex connectors and the one quick disconnect. See Fig. 21.
4.Remove the power supply assembly to a table or workbench.
PERFORMANCE
SWITCHHI
LO
M682
Fig. 19. Setting performance switch in either HI or LO.
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