Carrier Airaaxcc20a Owners Manual

							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.
ADDITIONAL CHECKOUT PROCEDURES
The following instructions are for use by qualified service person-
nel only:
The following procedures will expose energized electrical
components. Disconnect power between checks and proceed
carefully. Electrical shock can cause injury or death.
The secondary circuit can also be checked for proper output
voltages using multimeter and high-voltage probe. To check for
proper operation, follow these steps:
1. Remove power supply access cover.
2. Make sure control switch is on and input voltage is as
specified.
3. Make connections from high-voltage probe to multimeter in
accordance with owners manual. Meter should be set for
reading DC voltage on 20-v full scale. Check control board
assembly prior to checking cells for damage or carbon patch.
NOTE:The cell contact should be visually checked for corrosion,
excessive dirt build up, and electrical arc tracking (carbon path
from stainless steel spring to grounded metal).4. Remove cell access door. Attach high-voltage ground lead
from high-voltage probe to cabinet. While depressing safety
switch lever, touch ionizer wire support bar with end of
high-voltage probe. (See Fig. 18.) Meter should read 6.2
kVDC±0.2 kVDC.
5. If no voltage is measured, remove cell and check second cell.
Meter should read 6.2 kVDC±0.2 kVDC.
6. If proper voltage is measured, the first cell is shorted. (Refer
to Table 2.)
7. If no voltage is present, remove the second cell. Install first
cell and measure voltage as described above. If voltage is
present, the second cell, which is now out of cabinet, is
shorted. (Refer to Table 2 for cell checkout procedure.)
8. If no voltage is present, remove both cells and measure power
supply output. While depressing safety switch, touch end of
high-voltage probe to either front or rear contact board
assembly. (See Fig. 19.) Meter should read 6.2 kVDC or
higher.
9. If no voltage is measured, check power supply as outlined in
power supply section.
10. Set multimeter for reading AC voltage at 200-v full scale.
With test leads attached to multimeter, touch 2 transformer
output lead junctions to printed circuit board and read meter.
11. If there is no output voltage from 24-v transformer, replace
24-v transformer and power supply.
12. If there is proper output voltage from 24-v transformer,
replace power supply.
OTHER FACTS YOU SHOULD KNOW
Step 1ÐWhite Dust
Occasionally white dust might be noticed in bedrooms or newly
furnished rooms. This is mainly composed of lint which, because
of its weight, settles before it reaches your unit. This dust is not
mixed with airborne dirt, therefore, it is clean and has no staining
or soiling properties. It will lessen as excess lint works out of
fabrics.
Step 2ÐOzone
Under normal operating conditions all electrostatic air cleaners
produce minute quantities of ozone as an incidental by-product, as
do televisions and other electrical appliances. Design of this unit
has been tested and is far below published permissible limits. The
level of detection (when it is noticed) varies from individual to
individual, some being more sensitive to ozone.
Usually a new unit will produce more ozone than 1 that has been
in operation for several weeks. This is due to the normal amount
of sharp corners or manufacturing burrs on the ionizing-collecting
cell. The voltage working on these areas, however, tends to round
them off and the problem is self-correcting.
Table 2ÐCell Checkout Procedure
CAUSES CORRECTIONS
Loose ionizing wire(s)Replace loose wire(s)
Excessively dirty cellClean as outlined in Maintenance Section
Damaged (bent) platesStraighten or replace collector cell
Improper ground
This is a spring located on cabinet assemblyCheck ground
Large pieces of foreign matter lodged between
platesRemove
Very dirty insulatorsClean
Broken ionizing wiresRemove all pieces of broken wires
Replace broken wire(s)
Excessively bent or misaligned components
due to mishandlingStraighten bent plates or replace collector cells
Externally broken or cracked insulatorsReplace insulator
11 
						

							An ionizing-collecting cell that has been damaged, where the
designed spacing between electrically charged and ground com-
ponents has been decreased, may also produce an abnormal
amount of ozone.
Step 3ÐHigh Altitude Operation
Because air is less dense at higher altitudes, there is a possibility
of nuisance arcing. To reduce this annoyance, refer to the
following note. Cutting of red jumper wire will reduce voltage and
eliminate arcing. The red jumper wire must be cut in installations
of over 5,000 ft elevations. (See Fig. 20.)
NOTE:There is a red jumper wire on the power supply printed
circuit board, cutting this jumper will slightly reduce output
voltage and reduce ozone level.
If there appears to be excess ozone, check for:
· Damaged (bent) plates Ð Straighten or replace collector cell.
· Loose ionizing wires Ð Replace.
· Dirty cell Ð Clean.
· Loose high voltage connections Ð Repair or replace.
· Radio and/or television interference Ð This trouble is not
common, but when it occurs it is usually due to either
continuous high voltage leak or discharge, or due to the
absence of a good common electrical ground. Refer to condi-
tions listed under Crackling and Snapping in Fig. 23.Step 4ÐAirflow Sensor (optional)
An optional electronic airflow sensor kit is available (Part No.
KEAAC0101AAA) if air cleaner cannot be wired directly to the
EAC-1 or EAC-2 terminals. Location of airflow sensor is shown in
Fig. 21.
NOTE:Be extremely careful not to cover airflow sensor orifice
when sealing air cleaner and duct work. This hole is located on
right hand side (when facing unit) of power supply assembly. The
hole is 3/16-in. diameter and is located approximately 3 in. from
front and 1 in. from bottom of power supply assembly.
If air cleaner is installed in crawl spaces or attics that are dusty and
dirty, sensor on airflow switch over a period of time will be
covered with dirt and become inoperative because airflow over
thermistor is unable to cool it. The result is air cleaner will not
energize. In these applications, periodically cleaning the sensor
through side of power supply assembly with a cotton swab dipped
in rubbing alcohol will restore it to full operational use.
On continuous blower applications, after servicing air cleaner,
cleaning cells, or power outages by utility company, airflow sensor
must be reset. This reset requires that air handler in furnace/air
conditioner be stopped for minimum of 2 minutes to allow airflow
sensor to reset. To stop air handler, turn off the fan at the
thermostat. Reset thermostat to heating/cooling as required.
Fig. 18ÐHigh Voltage Check of Ionizer Wire
Support Bar
A97171
Fig. 19ÐHigh Voltage Check of Contact Board
Assembly
A97172
12 
						

							Fig. 20ÐWiring for High Altitude Operation
A97173
Fig. 21ÐAirflow Sensor Kit Installation
A97174
AC AC TR TR
C1
D1 R5R4
PC BOARD 
MOUNTING
CLIPS
BLUE
YELLOW
13 
						

							Fig. 22ÐView of Major Components
A97175
OPTIONAL
CELL CONTACT
14 
						

							Fig. 23ÐTroubleshooting the Duct Mount Electronic Air Cleaner
A97176
Is green light on?
Ye sYe s
Ye s
Ye s
Ye s
Ye s No No No No No No
No No No Ye s
Ye s
Ye s
Ye s Ye s
Ye s
Ye s No No
No Is red light on?
Is cell crackling and snapping?
Is cell sizzling?Is transformer defective? Is power supply defective? Is power supply wiring OK? Are contact boards OK? Is cell dirty or defective? Is ON/OFF switch working? Is the safety interlock system OK? Is input AC power available? Is unit operating?1.	 Repair or replace any loose wires or bad connections
	 to green light.
2.	 Replace defective green indicating light.
1.	 Replace any blown fuses and reset any tripped
	 breakers.
2.	 Repair or replace any loose wires or bad connections.
1.	 Check that access door is not open or ajar.
2.	 Repair or replace any loose wires or bad connections.
3.	 Replace any defective momentary contact switch.
1.	 Assure that ON/OFF switch is turned ON.
2.	 Repair or replace any loose wires or bad connections.
3.	 Replace defective ON/OFF switch.
1.	 Remove any objects between adjacent collector plates.
2.	 Replace corroded or carbonized insulators.
3.	 Replace any broken ionizing wires.
4.	 Wash dirty cell.
1.	 Replace contact board if contacts are corroded or
	 carbonized.
2.	 Replace any defective wires.
3.	 Clean dirt build-up on contacts with alcohol and let dry
	 thoroughly.
1.	 Repair or replace any loose wires or bad connections.
1.	 Replace defective high frequency power supply.
1.	 Replace power supply.
2.	 Replace transformer.
1.	 Wash dirty cell including any powder build-up on
	 ionizing wires.
2.	 Straighten any bent plates.
3.	 Replace any broken or loose ionizing wires.
1.	 Assure good contact between cell, and contact
	 boards. Replace defective contact boards.
2.	 Assure good contact between cells and ground
	 contact.Repeat these
steps until all
problems are
eliminated START HERE
15 
						

							A94328
SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase your 
knowledge of the equipment discussed in this manual, including:
		 • Unit Familiarization		 • Maintenance
		 • Installation Overview	 • Operating Sequence
A large selection of product, theory, and skills programs is available, using popular 
video-based formats and materials.  All include video and/or slides, plus companion 
book.

Classroom Service Training plus hands-on the products in our labs can mean 
increased confidence that really pays dividends in faster troubleshooting, fewer 
callbacks.  Course descriptions and schedules are in our catalog.

CALL  FOR  FREE  CATALOG  1-800-962-9212

[  ] Packaged Service Training	 [  ] Classroom Service Training
Copyright 1997 CARRIER Corp. · 7310 W. Morris St. · Indianapolis, IN 46231aira1si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 7a 9a
PC 101 Catalog No. 03AI-RA0 Printed in U.S.A. Form AIRA-1SI Pg 16 6-97 Replaces: New