69-0976B—1
8
F58F DUCT MOUNTED ELECTRONIC AIR CLEANER
TROUBLESHOOTING AND SERVICE
WARNING
Electrical Shock Hazard.
Can cause personal injury or
equipment damage.
The following procedures expose hazardous live
parts. Disconnect from power between checks and
proceed carefully. The instructions are for use by
only qualified personnel.
Tools And Equipment
Troubleshooting the electronic air cleaner requires:
•
Needle nose pliers for stringing ionizer wires and
inserting edge connectors.
•
Test meter.
The electronic air cleaner troubleshooting charts show how
to quickly isolate a problem in the air cleaner. Although a
meter is needed for some steps, the primary diagnostic
tools are the
neon light and the test button. See Fig. 12.
Neon Light (On Power Box)
The neon light is powered through the power supply and is
on when the power supply output voltage is normal.
Test Button
When pushed, the
test button shorts from collector voltage
to ground. The resulting arcing sound indicates that high
voltage is being supplied to the collector. The solid state
power supply controls current flow to the collector. On air
cleaners with a W8600F, the FAULT indicator will activate
when the
test button is held down.
FAULT Indicator (Air Cleaners with W8600F)
The FAULT indicator is on the W8600F. It indicates the
following problems: excessive dirt loading, partial shorting
of the collector, continuous ionizer or collector arcing,
power supply failure, excessive ionizer current, or any
condition causing a major reduction in high voltage.
Power Box
WARNING
Electric shock hazard.
Can cause personal injury.
Always turn off power and remove access door
before removing power supply or its cover.
The solid state power supply within the power supply box
can be replaced. If troubleshooting indicates a power
supply problem, replace the entire power box or replace
the power supply within the box. See form 69-1136. See
Fig. 10 for power box removal.
Modification To Reduce Ozone Odor
WARNING
Electric shock hazard.
Can cause personal injury.
Always disconnect power and open the access
door before opening the power supply cover.
The electronic air cleaner generates a small amount of
ozone in normal operation. 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.
The average person can detect the odor of ozone in
concentrations as low as 0.003 to 0.010 parts per million
(ppm). The electronic air cleaner contributes 0.005 to
0.010 ppm of ozone to the indoor air. The U.S. Food and
Drug Administration 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 as high 0.100 ppm.
However, if desired, the ozone generated by the air
cleaner can be reduced in one of two ways:
1. Install an activated carbon filter downstream from
the air cleaner. Make sure particles from the air filter
cannot fall into the air cleaner.
WARNING
Electric shock hazard.
Can cause personal injury.
Only a trained service technician should perform
the following procedure.
2. Move J5 shorting bar. This will reduce ozone
production about 20-25 percent and reduce effi-
ciency about 7-10 percent depending on actual
airflow delivered by the furnace blower.
a.
Unplug or disconnect power to the air cleaner.
b.
Open the access door.
c.
Remove the power box cover. See Fig. 13.
d.
Locate J5 shorting bar on the power supply.
See Fig. 14. Remove the shorting bar and
reinstall so it is on only one pin.
NOTE:
The ozone will be reduced, but the shorting
bar is available for reinstallation if needed.
e.
Replace the power supply cover and access
door. Turn on the power.
f.
Repeat the checkout procedure before leaving
the job.