•
Fluke No. 8021B multimeter or equivalent
•
Fluke No. 80K-40 high-voltage probe or equivalent.
Step 2—Indication of Electrical Trouble
Air cleaner is equipped with input power LED light (green) and
output voltage LED light (red) for indicating proper unit operation.
When unit is in normal operation, system blower running, access
door in place, control switch in the "ON" position, and indicating
lights go out, there is an electrical problem.
If green light goes out there is a problem in the primary circuit. If
red light goes out the problem is a shorted secondary. Although
failure of indicating lights should not be overlooked, this condition
is unusual and rather remote.
Step 3—Electrical Troubles and Their Conditions
Exercise the usual precautions when working with high
voltage.
When the circuit has been de-energized, always discharge any
residual current in the secondary with an insulated handle
screwdriver. Electrical shock can cause injury or death.
Always ground power supply and ionizing-collecting cell
when bench testing. Electrical shock can cause injury or
death.
PRIMARY CIRCUIT
Normal operation — For normal operation of electronic air
cleaner, system blower should be running and air cleaner switch
should be "ON."
If there is supply line voltage at the service connections and no
input voltage to power supply (green light out), outage can be
located by checking operation of safety switch and interconnecting
wiring with multimeter. Refer to Circuit Diagram, Fig. 17 to check
operation of switches.
Follow these steps:
1. Assure that circuit breaker controlling air cleaner is in "ON"
position. Main fuse not open.
2. Set multimeter for reading AC voltage at a 200-v full scale for
120-v units.
3. Connect 1 lead of multimeter to load side of interlock switch.
Connect other lead to common (white) lead at a convenient
place in power supply assembly. Depress switch and measure
voltage. If there is no voltage reading, switch is defective and
should be replaced.
4. With white lead still connected as in step 3, connect multim-
eter test lead to loadside of the ON/OFF switch. ON/OFF
Fig. 17—Circuit Diagram
A97070
1
2
3
9
4
6
GN
RD
O
O
R
BL
Y
BK
1. Interlock Switch
2. On-Off Rocker Switch
3. 50VA Stepdown Transformer
Class-2 24VAC Output
4. High Frequency Oscillator and
High Voltage Power Supply Board
5. Output LED (Red)
6. Input LED (Green)
7. Ionizer-Collector Cells
8. Cell to Power Supply Contact
9. Jumper Wire (remove to install
optional Air Flow Sensor Kit)
LEGEND
W
Y
W/O
W/O
5
8
7
7
10