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3.  Push the light out through front of power box.
4.  Push the new light into the power box.
5.  Connect the wiring to the LED terminals on the power

board. P3 - red; P4 - black. Route the wires away
from the high voltage wires or contacts.

6. Replace cover.
7. Return power to Air Cleaner. Test light.

Replacing A Power Board

Before replacing the power board, turn

OFF

power to

the Air Cleaner at the source or remove the plug.
1. Remove the power box cover.
2. Disconnect wiring from the LED, HV1, HV2 and 24 V

terminals. Make note of position of wires.

3.  Remove the three hex nuts from the power board.
4.  Remove the power board from the studs.
5.  Place the new board onto studs with the 24 volt input

close to the transformer.

6. Replace the hex nuts removed in Step 3. Ensure the

star  washer  is  in  place  over  the  steel  spacer  at  the
ground  location  on  the  power  board.  For  proper
grounding the  washer must be located on the top of
the steel spacer, under the power board.

7. Reconnect wiring to LED, HV1, HV2, and 24 V

terminals on the new power board. See Fig. 5.

8. Return power to Air Cleaner. Test power board.
9. Replace power box cover.

Note:

The power board has been set before shipping. It

is not usually necessary to reset the voltage to the new
load. If you do need to adjust the voltage refer to Setting
Voltage of Power Board section for more information.

Testing Air Proving Switch (APS)

The APS sensor must sit in the plastic bushing to

operate correctly.

The sensor is very sensitive and

operation may be affected by cold ambient temperatures,
an air exchanger, or a fresh air duct connected to the
return air duct just upstream of the Air Cleaner.

The APS uses a Triac in its output circuit, which

affects  the  voltage  sine  wave.  Using  a  regular  digital
voltmeter may 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  210  and  240  VAC,
depending on the airflow across the sensor.

A 220 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 operation.

Do not use performance light.

When the Air Cleaner is turned on without airflow, the

APS sensor heats up, and after 20-30 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.

The light on the power switch will be lit even when

the APS is open.

If the power board fails to come on with the fan on,

check that the sensor is properly set down, to the bottom
of the plastic bushing, in the front of the power box. To
check the APS for proper operation remove the collecting
cells, turn the unit

without the fan on. The power

board  should  come  on  immediately,  and  then  turn  off  in
20-30 seconds as the sensor heats up. To check sensor,
blow  directly  on  it lightly. This should activate the  power
board  within  10  seconds.  Service  the  sensor  carefully.
The sensor leads are 220 V. If the APS does not turn the
power  board  and  performance  indicator  on,  by-pass  the
APS  by  placing  a  jumper  between  wires  3  &  4  on  the
APS. This removes the APS from the circuit.
See Troubleshooting Guide for more information.

Note:

If the air flow through the Air Cleaner is less than

360 CFM the APS sensor may not have enough air flow
to  activate  the  Air  Cleaner.  See  Wiring  for  information
how  to  wire  the  Air  Cleaner  to  the  EAC  module  of  the
system. In very  low  air applications the  Air Cleaner  may
need to be wired through the EAC contacts and the APS
disabled by connecting wires 3 & 4 together.
If  there  is  no  EAC  module  or  it  is  not  powered  on  low
speed then a relay will have to be installed to activate the
Air Cleaner when the fan starts. The APS will have to be
disabled.

Replacing An Air Proving Switch (APS)

Before replacing the APS, turn

OFF

the power to the

Air Cleaner at the source.
1. Disconnect wiring from terminals 1, 2, 3, and 4 on the

APS. See Fig. 5.

2. Remove the circuit board from the studs by removing

the two nuts. Do not remove the spacers.

3. Install the new APS on the studs and secure with the

nuts. Ensure sensor protrudes only to the bottom of
the plastic bushing.

4. Connect wiring to terminals on APS. See Fig. 5.

Wiring from the power switch is connected to
terminals 2 and 3. Wiring to the transformer is
connected to terminals 1 and 4.