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 and 6.
2. Release circuit board from plastic spacers by
pinching end of spacer and pulling board out.
3. Install new APS on plastic spacers. Ensure sensor
protrudes slightly through plastic bushing.
4. Connect wiring to terminals on APS. Wiring from
power source is connected to terminals 2 and 3.
Wiring to power board is connected to terminals 1
and 4.
5. Test the new APS.
Testing For High Voltage At Power Board
A high voltage meter capable of measuring up to
10,000 VDC is required to test the voltage.
1. The Air Cleaner should be
ON
with the door
closed. The unit fan should be running. The Air
Cleaner should be on at least 5 minutes to allow
voltage to stabilize.
2. Remove cover from power box.
3. Connect the ground of the high voltage meter to an
unpainted surface in the power box.
4. Check terminals HV1 and HV2 (where applicable)
on the power board to determine if voltage is
present.
5. If no voltage present, remove both cells from the
Air Cleaner and replace access door.
a. Check the voltage at HV1 and HV2 (where
applicable) again.
b. If voltage is present, the problem is with one of
the cells or the copper contact on the high
voltage tray.
c. With a flashlight, look into the cabinet to check
condition of the copper contacts.
d. If the contacts are not bent, replace one cell
and retest voltage. If cell is OK, test the other
cell. If the problem is with a cell, see
Troubleshooting Guide.
e. Check the APS to make sure that it is
functioning correctly.
f. Check the transformer to make sure power is
being supplied to the Air Cleaner.
6. If there is voltage present, but the performance
light does not come on, replace light.
7. High voltage can be adjusted with high voltage
potentiometer if required.
Replacing Performance Light
Before replacing performance light, turn off power
to the Air Cleaner at the source.
1. Remove the power box cover.
2. Disconnect the performance light wiring connected
to the LED terminals on the power board.
3. Push the light out through the front of the power
box.
4. Push the new light into the power box.
5. Connect the wiring to the LED terminals on the
power board. See Fig. 5 and 6.
6. Replace
cover.
7. Return power to Air Cleaner. Test light.
Replacing A Power Board
Before replacing power board, turn off power to the
Air Cleaner at the source.
1. Remove the power box cover.
2. Disconnect wiring from the LED, HV1 and 120
VAC power board terminals (A/ GSAS-10 and A/
GSAS-11) or LED, HV1, HV2 and 24 V terminals
(A/ GSAS-12 and A/ GSAS-18) and ground. See
Fig 5 & 6.
3. Remove the 2 hex nuts from the power board.
4. Release the power board from the 2 plastic board
spacers, by pinching the end of the spacers and
pulling the board out.
5. Push new board onto spacers. Make sure spacers
click into place to hold down board.
6. Screw on 2 hex nuts saved from Step 3. Ensure
the star washer is in place over the steel spacer for
proper grounding.
7. Reconnect wiring to LED, HV1 and 120 VAC (A/
GSAS-10 and A/ GSAS-11) terminals or LED,
HV1, HV2, and 24 V terminals (A/ GSAS-12 and A/
GSAS-18) and ground on the new power board.
8. Replace power box cover.
9. Return power to Air Cleaner. Test power board.
Note:
Although the power board has been set before
shipping, it may be necessary to reset the voltage to
the correct load for optimum efficiency. Refer to
Testing Voltage At Power Board section for more
information.
Testing The 24 V Transformer
(A/ GSAS-12 and A/ GSAS-18 Only)
1. The Air Cleaner should be
ON
. The system fan
should be running. The access door should be
closed.
2. Remove power box cover.
3. Disconnect the leads of the 24 V transformer from
the power board. See Fig. 6.
4. Measure voltage across leads with a voltmeter.
Voltage should read 24 - 27 VAC.
5. If no voltage present, check the operation of the
APS.
6. Before replacing transformer, check the resistance
of the power board input. Input should read above
40 Kohm. If resistance is below 40 Kohm, the
power board may be the cause of the transformer
failure.
7. Reconnect leads to power board.
8. Replace power box cover.
