GeneralAire GA52F32 - Manual (Page 5)

approximately 12-24 hours. A hair dryer may be used
to speed up drying time.
6. To wash prefilters, spray with DAX Detergent, rinse
and let dry. Do not wash in the same water as
collecting cells.
7. Place cells and prefilters back into cabinet. Close door
and turn power switch ON. If the performance light
does not come on or arcing occurs, turn Air Cleaner
OFF and allow air from system fan to dry cells
completely.
Fig. 4
— DAX Detergent
is available from your installer
or dealer.
SERVICE
Testing Air Proving Switch (APS)
The APS sensor must protrude into the airstream to
work effectively. The sensor is very sensitive and
operation may be affected by cold temperatures, an air
exchanger, or a fresh air duct connected to the cold air
return near the Air Cleaner.
The APS uses a Triac in its output circuit, which
affects the voltage sine wave. Using a regular digital
voltmeter will give a false reading. To check the output
from the APS, use a true RMS (root mean square) meter
to measure the output at terminals 1 and 4 of the APS.
The output should be between 105 and 115 VAC,
depending on the airflow across the sensor.
A 125 volt neon lamp may be used to test the output
of the APS. Place the leads of the lamp across terminals 1
and 4 of the APS. If the lamp lights, the voltage is
sufficient for proper operation.
When the Air Cleaner is turned on without airflow, the
APS sensor heats up and within 30 seconds, opens the
circuit to turn off the power board. When the fan starts up
(the sensor is cooled), the circuit will close, the power
board is turned on, and the performance light will come
on.
If the power board fails to come on with the fan on,
check that the sensor is properly set in the airstream
behind the cell next to the switch. To check the APS for
proper operation, turn the unit on and activate. The power
board should come on immediately, and then turn off
within 30 seconds as the sensor heats up. When the
system fan is turned on, this should activate the power
board within 10 seconds. Service the sensor carefully.
The sensor leads are 120 V.
Adjusting the APS Sensor Depth
Turn the power switch OFF and wait 15 seconds then
open the door to the collecting cells. Remove the cells
and prefilters. Loosen the two screws on the hold down
strap and pull out on the slide mechanism. (See Fig. 2)
Do not pull on the sensor!
Once the sensor is in the desired position tighten the
two screws on the hold down strap. Replace the cells and
prefilters and test the unit for activation on all air speeds.
Replacing An Air Proving Switch (APS)
Before replacing the APS, turn the power to the Air
Cleaner OFF at the source.
1. Disconnect wiring from terminals 1, 2, 3, and 4 on the
APS.
2. Release circuit board from plastic spacers by pinching
end of spacer and pulling board out.
3. Remove hold down strap of the slider.
4. Install new APS on plastic spacers.
5. Install slider hold down strap loosely and adjust
sensor to desired position in the air flow. Tighten
strap.
6. Connect wiring to terminals on APS. Wiring from
power source is connected to terminals 2 and 3.
Wiring to the transformer is connected to terminals 1
and 4.
7. Test the new APS.
Testing For High Voltage At Power Board
A high voltage meter capable of measuring up to
10,000 VDC is required to test the voltage.
1. Turn the Air Cleaner OFF. Remove cover from
electrical compartment.
2. The Air Cleaner should be ON with the door closed.
The unit fan should be running. The Air Cleaner
should be on at least 5 minutes to allow voltage to
stabilize.
3. Connect the ground of the high voltage meter to the
ground stud of the power board.
4. Check terminals HV1 and HV2 on the power board to
determine if voltage is present.
5. If no voltage is present, remove both cells from the Air
Cleaner and close access door.
a. Check the voltage at HV1 and HV2 again.
b. If voltage is present, the problem is with one of
the cells or the copper contact on the high voltage
tray.
c. With a flashlight, look into the cabinet to check
condition of the copper contacts.
d. If the contacts are not bent, replace one cell and
retest voltage. If cell is OK, test the other cell. If
the problem is with a cell, see Troubleshooting
5
WARNING
Electronic Air Cleaners use high voltage (low
amperage). Only trained personnel should perform
service. Use caution. Electric shock can cause injury
or death. Disconnect power source before replacing
parts.