Testing Voltage At Cell
1. Open access door to Air Cleaner. Air Cleaner will
shut off.
2. Insert a thin shafted screwdriver 2 to 3 inches into
the hole in the round end plate insulator. See Fig.
9.
3. Attach the ground of the high voltage meter on to a
grounded area of the cell.
4. Place the tip of the high voltage probe on the shaft
of the screwdriver. Press down the safety interlock.
Power to Air Cleaner will come on.
5. Wait until the voltage stabilizes, then take a
reading. Adjust the HV ADJ potentiometer until the
voltage reading matches the voltage in Table 2. 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.
6. Let up on the safety interlock. Remove high
voltage meter.
7. Remove screwdriver and close access door.
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 power box cover.
2. Turn the HV ADJ potentiometer fully clockwise. Air
Cleaner may arc or snap at this point.
3. Turn the HV ADJ potentiometer counterclockwise
slowly until the arcing and snapping stops.
4. Replace power box cover.
Testing Cell For Bad Contact
1. Open access door to Air Cleaner.
2. Place a screwdriver between plates of the cell, or
place a small screwdriver into the hole in the end
plate insulator and short with another screwdriver
to cell end plate. See Fig. 10.
3. Press safety interlock switch to start Air Cleaner.
There should be an initial snap when the plates are
shorted, then no sound. If a hissing occurs, then
there is a bad contact. Look along the top of the
cell, with the short still in place. If there is a small
arc between the cell top and copper contact, then
that is the bad contact. Pull cell out and gently pull
copper contact down.
If an arc is not seen and there is a bad contact,
then the problem may be the internal contact of the
cell. With an ohmmeter, check continuity between
the top disc contact and the first plate. the reading
should be close to 0 ohms. If not, bend the contact
to touch the plate. On dual voltage units (three disc
contacts), there are two internal contacts, one on
each side. Test each contact.
4. Let up on safety interlock.
5. Remove
screwdrivers.
6. Close access door.
Removing Power Box
1. Turn the main system switch off or disconnect the
power source.
2. Remove the power box cover.
3. Disconnect the source wires to the Air Cleaner.
Cap off the wires so the system can still be
operated.
4. Disconnect high voltage leads from power board.
5. Remove three nuts holding the power box to the
cabinet. Do not remove the nut at the center front,
located between the switch and the light. This nut
holds the high voltage tray onto the power box.
Removing High Voltage Contact Tray
1. Turn off power to Air Cleaner.
2. Remove cells, prefilters and carbon filters from Air
Cleaner.
3. Remove the high voltage wires from the power
board.
4. Remove the four screws securing the contact tray
to the cabinet. Two screws are located at the rear
of the cabinet, behind the power box. The other
two screws are located behind the door at the front
of the cabinet. Support the tray as you remove the
screws. As you lower the tray, feed the high
voltage wire(s) down through the plastic wire
bushing.
5. To reinstall the contact tray, reverse the procedure.
When reconnecting the high voltage wire(s) to the
power board, attach the wire with clear or no
sleeving to HV1. The wire with the blaack sleeve (if
used) is connected to HV2 on the power board.
6. To reinstall high voltage contact tray, reverse
above procedure.
Fig. 10 — Testing For Bad Contacts
Screwdriver
