switch shall be in "ON" position. Actuate interlock switch and
measure voltage. If there is no voltage reading, ON/OFF
switch is defective and should be replaced.
SECONDARY CIRCUIT
1. Ionizing-Collecting Cell
Cell is electrically energized through a contact terminal
located at top center of cell. Ionizing wires and every other
collector plate are electrically charged while each interleaving
plate is grounded.
If space between charged and grounded plates is bridged with
conductive or semi-conductive material, a short circuit devel-
ops. The bridging or short may be caused by damaged plates
or foreign material lodged between or on plates.
Since cell is periodically removed from unit to wash away
collected dirt, it is susceptible to physical damage. Also, cell
contains ionizing wires which, due to their function, have to be
designed with minimal structural support and are susceptible
to breakage. However, trouble related to a shorted collector
cell is readily shown by output indicating light and can be
quickly isolated by the following procedure:
If red performance light dims or goes out during normal
operation, a short may exist in one or both collector cells.
To determine if a short exists in 1 or both of the collector cells,
turn electronic air cleaner "OFF" and remove both electronic
cells from cabinet. Close door and re-power unit. If red
performance light comes on, an electrical short exists in 1 or
both of the electronic cells. Replace cells in unit, 1 at a time,
to determine which cell is shorted.
Most troubles in the cell can be visually detected and
corrected. (See Table 2.)
NOTE:
Ionizer collector cells are not designed for field repair.
Ionizing wires and insulators can be field replaced. It is not
recommended to attempt to replace other cell components, such as
collector plates, end plates, ionizer supports.
2. Ionizing Wire Replacement
Ionizing wire breakage is minimal because of the constant
tension design and fixed location of ionizing wire supports. If
necessary to replace a broken wire follow these instructions.
Wires are supplied in coiled spring configuration, with clinch
nut on each end of wire.
Wire replacement requires pair of needle-nose pliers. Exercise
caution in removing any broken wires in collector cell. This
will prevent accidental shorting of cell and reduce need for
further maintenance.
Use the following procedure when replacing ionizing wire.
Handle with care as parts are sharp.
a. Carefully remove all remains of broken wire.
b. Grip new wire at each end with your thumb and index
finger. While stretching wire to approximately 6 in. allow
1 end of wire to uncoil between your thumb and index
finger.
c. Place 1 end of wire in slot in stainless steel support on
collector cell from front of cell. This support is partially
covered by cell brace in front of support.
d. Grip other end of ionizing wire with needle-nose pliers and
insert terminated end of wire into slot of support bar of
opposite end of collector cell.
e. Wire should be tight enough to be self supporting and
remain suspended between 2 support slots in support bar.
POWER SUPPLY
If output light remains out with cells removed, the trouble is in the
power supply. Specific problems in power supply assembly can be
isolated by using a multimeter and high-voltage probe to check for
proper output voltages.
To properly check power supply, follow these steps.
1. Remove power supply access cover.
2. Make sure control switch is on and input voltage is 120v, 60
Hz.
3. Set multimeter to read AC voltage. Use 200-v full scale
setting. With test leads attached to multimeter, touch 2
transformer output lead junctions to printed circuit board and
read meter.
4. If there is no output voltage from 24-v transformer, replace
24-v transformer and power supply board.
5. If there is proper output voltage from 24-v transformer,
replace power supply board.
NOTE:
Air cleaner is designed for easy wiring and installation;
attaching 2 leads to nearest 120-v power source to put unit into
operation. Electronic air cleaner cannot be wired into motor leads.
On multiple speed blower taps, voltages can exceed 190 VAC
(120-volt motors). This kind of input voltage will damage both
power supply and void the warranty.
Table 2—Cell Checkout Procedure
CAUSES
CORRECTIONS
Loose ionizing wire(s)
Replace loose wire(s)
Excessively dirty cell
Clean as outlined in Maintenance Section
Damaged (bent) plates
Straighten or replace collector cell
Improper ground
This is a spring located on cabinet assembly
Check ground
Large pieces of foreign matter lodged between
plates
Remove
Very dirty insulators
Clean
Broken ionizing wires
Remove all pieces of broken wires
Replace broken wire(s)
Excessively bent or misaligned components
due to mishandling
Straighten bent plates or replace collector cells
Externally broken or cracked insulators
Replace insulator
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