GeneralAire GA52F32 - Manual (Page 7)

7. Turn OFF the Air Cleaner.
8. Remove the high voltage meter.
9. Replace the electrical compartment cover.
10. Turn ON the Air Cleaner.
Testing Voltage At Cell
1. Turn OFF power switch. Open access door to Air
Cleaner. Remove prefilters from track.
2. Close access door to Air Cleaner. Remove one of the
grilles from in front of each cell.
3. Remove the electrical compartment cover.
4. Attach the ground of the high voltage meter on to a
grounded area of the cell.
5. Place the tip of the high voltage probe on the cell
wire.
6. Turn the Air Cleaner ON.
7. Wait until the voltage stabilizes, then take a reading.
Adjust the HV ADJ potentiometer until the voltage
reading matches the voltage in Table 1. If the voltage
fails to stabilize or jumps up and down by more than
100 V, there may be a bad contact in the cell or a bad
contact between the cell contacts and the high
voltage contacts on the contact tray.
8. Test the voltage in both cells. They should read very
close to the same voltage.
9. Turn the Air Cleaner OFF. Replace the grilles,
electrical cover and prefilters.
10. Turn the Air Cleaner ON.
Setting Approximate Voltage Without High Voltage
Meter
A high voltage meter should be used. If one is not
available, this method can be used. This will only set an
approximate voltage. After using this method, the voltage
should be reset with a high voltage meter as soon as
possible.
1. Remove electrical compartment cover.
2. Turn the HV ADJ potentiometer fully counter-
clockwise. Air Cleaner may arc or snap at this point.
3. Turn the HV ADJ potentiometer clockwise slowly until
the arcing and snapping stops.
4. Replace electrical compartment cover.
Testing Cell For Bad Contacts
1. Turn OFF power switch. Open access door to Air
Cleaner. Remove prefilters from track.
2. Close access door to Air Cleaner. Remove one of the
grilles from in front of each cell.
3. Turn the Air Cleaner ON.
4. Place a screwdriver between plates of the cell. There
should be an initial snap when the plates are shorted,
then no sound. If a hissing or ticking occurs, then
there is a bad contact either between the cell and the
high voltage contact or the contacts within the cell.
5. Test the ionizing wires by the same method, shorting
the wire to the grounded extended plate of the cell.
6. Turn the Air Cleaner OFF. Remove the cells and
check to see if the copper contacts along the bottom
of the cell channel are free.
7. With an ohmmeter, check continuity between the top,
outside disc contact and the first plate on the opposite
side of the cell. The reading should be close to 0
ohms. If not, bend the contact to touch the plate.
7
Fig. 5 — Schematic
CONTACTS 2 & 4 - 7000-7300 VDC
CONTACTS 1 & 3 - 4600-4800 VDC