Honeywell F90a1050 Owner's Manual

F90A,B

Self-Contained

Commercial Electronic Air Cleaner

PRODUCT DA T A

FEATURES

• Removes up to 95 percent of the staining dirt from the air,
as measured by the Initial Dust Spot Method using
atmospheric dust; refer to the American Society of
Heating, Refrigerating, and Air Conditioning Engineers
(ASHRAE) Standard 52-76.

• Provides Coanda air distribution by drawing in dirty air
from below, cleaning it electronically, and discharging the
clean air in four directions parallel with the ceiling.

• Three-speed fan circulates up to 1250 cfm (35 m3/min) for
F90A and 550 cfm (15.5 m3/min) for F90B.

• Solid state power supply is self-regulating, maintains peak
efficiency over a wide range of cell dirt loading conditions,
and provides nonlethal current levels.

• Interlock switch prevents operation when the cover is
open or the grille is not in place.

• Heavy duty commercial cells, prefilter, and grille are
removable for cleaning.

• Three-position adjustable discharge louvers control the

APPLICATION

The F90A,B Self-Contained Commercial Electronic Air
Cleaners are ceiling-mounted and remove airborne
contaminants such as tobacco and cooking smoke, dust,
pollen, bacteria, and larger viruses from the air circulated
through the unit.

direction of discharged air.

• Light emitting diodes (LEDs) indicate ON and CHECK;
WASH LED optional.

• Test button shows presence of high voltage.

• Available with gray finish or woodgrain with black trim.

• Optional hard-wired remote control assembly (part number
190097B).

• Optional carbon filters (part number 202614) for ozone
and odor control.

The Honeywell Trademark is used under license from Honeywell
Intellectual Properties, Inc. by Air-Pure Systems.
Honeywell International Inc. makes no representations or
warranties with respect to this product.

READ AND SAVE THESE

•

INSTRUCTIONS

Contents

Application .......................................................................... 1

Features ............................................................................. 1

Specifications ..................................................................... 2

Ordering Inform ation .......................................................... 2

Planning the Installation .................................................... 3

Installation .......................................................................... 6

Checkout ............................................................................ 12

Adjustments ....................................................................... 12

Service ................................................................................ 12

Electrical Troubleshooting ................................................. 16

Replacement Parts List/Exploded View ............................ 2 2

Limited One-Year Warranty ................................................ 2 4

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

SPECIFICATIONS

IMPORTANT

The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
a particular unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions, and
some minor differences in performance can be
expected if those conditions are changed.

Model:

F90A,B Self-Contained Commercial Electronic Air Cleaners.
Contains one or two FC37B heavy duty commercial cells, a
power supply assembly, one or two prefilters, cover with
grille, a power and speed control switch, a performance
selection switch, a test button, a three-speed motor driven
fan, an interlock switch for the cover and grille, a power cord,
and LED indication of system operation.

Color:

Available with gray finish or woodgrain with black trim.

Solid State Power Supply Assembly:

F90A, 120 Vac, 60 Hz: 203361E
F90A, 220/240 Vac, 50 Hz: 203361J

Electrical Ratings:

Voltage and Frequency (specify when ordering):

120 Vac, 60 Hz
220/240 Vac, 50 Hz

Current and Power Consumption:

ledoMgnitteSnaF)A(tnerruC)W(rewoP

IH6.2072

021,A09F

zH06,caV

DEM0.2512
WOL8.1581
IH4.1072

,A09F

,caV052/022

DEM0.1512

zH05

WO

L8.0581

Air Flow Capacity:

ledoMgnitteSnaFmfcm

3

IH05210.53

A09F

DEM02010.92

WOL0080.32

Efficiency:

Up to 92% efficient as measured by the Initial Dust Spot
Method using atmospheric dust, according to the American
Society of Heating, Refrigeration, and Air Conditioning
Engineers (ASHRAE) Standard 52-76.

etunim/

Ambient Temperature Rating:

Shipping and Storage: -20°F to +120°F (-29°C to +49°C).
Operating: The F90 is intended for use at ambient

temperatures that usually are not higher than 90°F
(32°C) but for brief periods, may be as high as 120°F

C

))

(49°

ORDERING INFORMA TION

If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:

1. Y our local Honeywell Commercial Air Product s Distributor.

2. Air-Pure Systems

16873 Fish Point Rd. SE
Prior Lake, MN 55372-1714
Phone: [phone]
Fax: [phone]

www.cleanairfacility.com

68-0103-6 Revised 11-07

2

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

8

(203)

24

(610)

LATCHES

POWER
CORD

1

M919

ALLOW AT LEAST 9 INCHES (229 MILLIMETERS) FROM BACK
OF F90B TO WALL FOR REMOVAL OF COVER.

7 (178)

1

2

2

ALLOW AT LEAST 16 INCHES (406 MILLIMETERS) FROM FRONT
OF F90B TO WALL FOR INSTALLATION AND REMOVAL OF CELLS.

3 (76)

16

(406)

5-3/4 (146)

3-1/4

(83)

29-1/4

(743)

19-1/4 (489)

14-1/2 (386)

Shipping and Installation Weight:

ledoMsdnuoPsmargoliK

ytuDyvaeH

lleClaicremmoC

A09F

thgieWgnippihS0.075.13

)hcaE(2.9)hcaE(2.4

thgieWdellatsnI0.565.

Dimensions:

See Figs. 1 and 2.

Approvals:

Underwriters Laboratories Inc. listed: File No. E30954,

Guide No. AGGZ (120 Vac units only).

Canadian Standards Association listed: File No. LR19060

(120 Vac units only).

U.S. FCC Class B limits for RFI, Computing Devices

Rules, Canadian EMI Standard.

Replacement Parts and Accessories:

See Parts List on page 22.

POWER
CORD

7/8 (22) 
DIAMETER 
KNOCKOUT


4

(102)



29-1/4 (743)

24 (610)

16 (406)

92

Fig. 2. F90B installation dimensions in in. (mm).

29-1/4 
(743)

24

16

(610)

(406)

1 INCH RADIUS

LATCHES

5-3/4 (146)

7 (178)

1

2

1

ALLOW AT LEAST 16 INCHES (406 MILLIMETERS) FROM FRONT
OF F90 TO WALL FOR INSTALLATION AND REMOVAL OF CELLS.

ALLOW AT LEAST 9 INCHES (229 MILLIMETERS) FROM BACK
OF F90 TO WALL FOR REMOVAL OF COVER.

Fig. 1. F90A installation dimensions in in. (mm).

2 (51)

M1530

PLANNING THE INST ALLATION

WARNING

Explosion Hazard.
Can cause property damage, severe injury, or
death.

1. Do not install or use the F90 where there is any

danger of gas, vapor, or dust explosion.

2. Do not install or use the F90 if explosion-proof
electrical fixtures are specified.

Application and Operation

The F90 Self-Contained Electronic Air Cleaner is used where

2

overhead air cleaning is required (restaurants, conference
rooms, lounges, and offices).

The F90 provides its own air circulation and is used in any
situation that requires the removal of contamination from an
enclosed area.

The F90 is not explosion-proof. Do not use the F90 where
dangerous levels of potentially explosive gases, vapors, or
dusts are present in the cleaning area.

3

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

The F90 is equipped with two standard light-emitting diodes
(LEDs) and one optional LED.

ON LED: Lights when the solid state power supply is

powered and operating normally.

CHECK LED: Lights if the F90 requires service or if the

test button is pressed.

WASH LED (if used): Lights when cell washing is overdue.

To understand the operating sequence of the F90, refer to
Fig. 3.

Determine Number of F90 Needed

The sizing procedure determines the number of F90s needed
for any application. The correct number required for a
particular application depends on:
— type of contamination.
— number of occupants.
— volume of the room.
— use of the room.
— outdoor air quality.

1

AIR CLEANER IS POWERED.

2

FAN DRAWS CONTAMINATED AIR INTO
THE BOTTOM OF THE F90.

3

LARGE PARTICLES ARE CAUGHT IN
THE PREFILTER.

SMALL PARTICLES PASS THROUGH
THE PREFILTER.

This sizing information in the following Examples 1, 2, and 3
was generated using the ASHRAE Handbook of
Fundamentals, 1990 and the ASHRAE Standard 62-1989,
Ventilation for Acceptable Indoor Quality. These examples
simplify the sizing procedure for most applications. Use this
information as a guide; however, keep in mind that the F90
has different capacities for each fan speed (see
Specifications section).

The number of air changes per hour determines the number
of F90s needed. More air changes per hour than indicated
are unnecessary because the ASHRAE data from which
these examples were constructed is conservative. Fewer air
changes per hour can be compensated for by bringing in
more outdoor air to maintain low contaminant levels or
tolerating a partially cleaned atmosphere. Either may be
acceptable to some users.

Regardless of the method used for calculation, the
architectural features, lighting fixtures, sprinkler system,
ducts, and grilles in the room to be cleaned may influence the
number of F90s required. For ambient air cleaning, establish
a uniform airflow pattern throughout the entire space. When
there is a lack of mounting space, fewer F90s than indicated
may be installed. More F90s may be required for oddly­shaped rooms that do not have even airflow.

If any questions should arise, consult your full-service
distributor Honeywell Commercial Air Products.

To calculate the number of F90s needed using occupant
load, refer to Example 2 (page 6).

To calculate the number of F90s needed using air changes
per hour and room volume, refer to Example 1 (page 5) or
Example 3 (page 6).

4

SMALL PARTICLES REMAINING IN THE
AIR ENTER THE IONIZER SECTION.

IN THE IONIZER SECTION, SMALL 
PARTICLES RECEIVE AN INTENSE
ELECTRICAL CHARGE.

5

THE SMALL CHARGED PARTICLES
ENTER THE COLLECTING SECTION
WHERE THEY ADHERE TO THE
COLLECTOR PLATES OF OPPOSITE
CHARGE.

CARBON FILTERS (IF USED) ABSORB
ODORS AND OTHER GASEOUS
CONTAMINANTS.

6

CLEAN AIR PASSES THROUGH THE
FAN AND IS DISCHARGED IN FOUR
DIRECTIONS INTO THE ROOM,
PARALLEL TO THE CEILING TO
CREATE A COANDA AIR FLOW
PATTERN.

M1527A

Fig. 3. F90 operating sequence.

Choose Location

Mount the F90 on the ceiling near the center of the room. A
45° diagonal mounting prevents stale air build-up in corners
and may allow use of F90s at lower speeds. See Fig. 4. In
larger rooms, divide the area into sections and mount an F90
in the center of each section. In rooms requiring varying
levels of air cleaning, concentrate F90s where air cleaning is
required most. See Fig. 4.

NOTE: To assure even air distribution, the F90 draws air

into the bottom of the air cleaner and discharges air
in four directions as shown in Fig. 5. This Coanda
air flow pattern assures that the clean air is
distributed to all parts of the space. Also, if possible,
mount the F90 to aid the air circulation already
established in the room.

68-0103-6 Revised 11-07

4

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

F90

F90

F90

BAR

F90

T

A

B

L

E

S

M1528A

F90

F90

F90

STAGE

LOW SMOKING LEVEL AT 
STAGE AND DANCE FLOOR. 
USE ONE F90.

HEAVY SMOKING LEVEL AT 
TABLES AND BAR.
USE THREE F90s.

F90

DANCE FLOOR

F90

F90

Fig. 4. F90 mounting considerations.

M923

Fig. 5. F90 Coanda air flow pattern.

Outdoor Air

ASHRAE Standard 62-89 specifies that every commercial
space be provided with fifteen cfm per occupant of outdoor
air to replenish oxygen and dilute CO2. If other internal
sources of gaseous contamination are present, additional
outside air is needed to dilute the contamination.

EXAMPLE: An office requires 20 cfm per person because

the standard estimates some smoking, some
copy machine operation, etc. The standard
assumes outdoor air will be cleaned to less
than 75 micrograms per cubic meter prior to
introduction into the space. ASHRAE Standard
62-89 states that supplemental air cleaning to
control smoke or additional outside air must
be provided as required.

Example 1. Sizing by Air Changes per Hour and Room V olume

An office measures 40 x 45 feet (12 x 14 meters) with a 15 foot (4.5 meter) ceiling. How many F90As should be installed?

Solution:

1. Find the room volume: 40 x 45 x 15 feet = 27,000 cubic feet, (12 x 14 x 4.5 meters = 756 cubic meters).

2. Assuming seven air changes per hour, with 27,000 cubic feet (756 cubic meters) volume, the graph below indicates three

F90As are required.

3. Clean outdoor air is also required to replenish oxygen and dilute gaseous contaminants. 20 cfm per person is required for
offices.

AIR 

CHANGES 

PER HOUR

25

20

BARS

15

10

5

0

10,000

[283]

20,000

[567]

ROOM VOLUME IN CUBIC FEET AND [CUBIC METERS]

30,000

[850]

40,000

[1133]

50,000

[1416]

60,000

[1700]

70,000

[1983]

10

9
8
7
6
5
4
3

F90As REQUIRED

2
1

M1524

BOWLING
CENTERS

PLACES OF
ASSEMBLY

CAFETERIAS

LUNCHEONETTES

RESTAURANTS

STORES

OFFICES

5

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

Example 2. Sizing by Occupant Load

A cocktail lounge averages 85 occupants. How many F90As should be installed?

Solution:

F90As Required = ASHRAE Recommended Air Circulation/Minute

1. ASHRAE recommended minimum air circulation is 30 cubic feet per minute (cfm) (0.85 m
people, the recommended air circulation would be: 85 people x 30 cfm (0.85 m
minute).

2. F90A capacity (HI setting) is 1250 cfm (35 m

F90A Capacity

3

/minute).

3

3

/minute) per person = 2550 cfm (72 m

/minute) per person. For 85

3

Number of F90A's Required =

3. Clean outdoor air is also required to replenish oxygen and dilute gaseous contaminants. 30 cfm per person is required for
bars and cocktail lounges.

A shop proprietor wants to use F90As to remove high levels of smoke from the air. The shop is 25 x 40 feet (8 x 12 meters) with
a 15 feet (4.5 meters) ceiling. How many F90As are required?

Guideline: In the absence of other information, select the correct number of F90A units to provide between 10 and 20 air

Solution:

F90As required =

1. Calculate the volume of the room: 25 x 40 x 15 feet = 15,000 cubic feet, (8 x 12 x 4.5 meters = 432 cubic meters).

2. Determine the volume of air to be circulated each hour. Ten air changes per hour are used here on the assumption that

the intent is to reduce, but not completely eliminate, smoke. 15,000 cubic feet x 10 air changes/hour = 150,000 cubic
feet/hour (432 cubic meters x 10 air changes/hour = 4320 cubic meters/hour)

3. Determine the volume of air to be circulated each minute:
150,000 cubic feet/hour = 2500 cubic feet/minute (cfm) 4320 cubic feet/hour = 72 cubic meters/minute (m3/minute)

60 minutes/hour 60 minutes/hour

4. F90A capacity (HI setting is 1250 cfm (35 m
Number of F90As Required = 2500 cfm = 2 F90As 72 m3/minute = 2 F90As

changes per hour, depending on contaminant level. The F90As should be located directly above or as close as
possible to the source of contamination.

Desired Air Circulation/Minute

F90A Capacity

2550 cfm = 2 F90A's 72 m3/minute = 2 F90As

1250 cfm 35 m3/minute

EXAMPLE 3. Sizing by Air Changes per Hour and Room Volume

3

/minute).

1250 cfm 35 m3/minute

INST ALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous
condition.

2. Check the ratings given in the instructions and on the
product to assure the product is suitable for your
application.

3. Assure the installer is a trained, experienced service
technician.

4. After installation is complete, check out product
operation as provided in these instructions.

68-0103-6 Revised 11-07

WARNING

Explosion Hazard.
Can cause property damage, severe injury, or
death.

1. Do not install or use the F90 where there is any

danger of gas, vapor, or dust explosion.

2. Do not install or use the F90 if explosion-proof
fixtures are specified.

Sharp Edges.
Can cause personal injury.
Wear protective gloves while handling the cells and
prefilter to avoid cuts from the sharp metal edges,
collection plates, and ionizer wires.

WARNING

Must be installed by only a Honeywell trained
installer.

6

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

CAUTION

Do not connect the power supply until F90 is
mounted. If the F90 is powered before an electrical
check, be extremely careful to avoid electrical shock.
Also, take care when working near the F90 moving
parts.

Unpacking

1. All F90 components are packed in one box. Slide the

F90 out of the box and remove all packaging material.

• Carefully check all F90 components when
unpacking.

• Check all packaging materials before discarding to
assure no parts or papers are lost.

• Use the mounting template marked on the outside
of the box for easy installation.

2. Pull the two latches located on the front of the F90
cover. Swing the cover down and lift to disengage from
the hinges.

3. Remove the prefilter and cell from the channel guides.

4. If installing the optional WASH LED, remove the power

supply switch plate. To install the WASH LED,
see Fig. 6.

5. Remove the power box from the unit. See Electrical
Troubleshooting section for instructions.

Mounting

WARNING

Heavy Equipment.
Can cause personal injury or equipment damage.

1. If the ceiling is not reinforced properly, the weight
of the F90 could cause structural weakening and
buckling. The unit can fall, presenting a danger
to persons and equipment.

2. When using the keyhole slots for mounting,
assure the washer diameter is larger than the
keyhole diameter (3/4 in. [19 mm]) or assure the
mounting screws are secured in the small
keyhole slot.

IMPORTANT

1. When mounting near walls, allow at least 16 in. (406

mm) for cell installation and removal and 15 in. (381
mm) for cover installation and removal. See Fig. 7.

2. Select a structurally strong part of the ceiling or wall
for mounting. Do not mount the F90 to a suspended
ceiling, to plaster, or to wallboard. If necessary,
construct strong framing to support the weight of
the F90.

The F90 can be mounted in any of four ways:

• Mounted into a ceiling joist using lag screws. See Fig. 8.

• Mounted into a suspended ceiling using threaded steel
rods. See Fig. 9.

• Mounted into a ceiling joist or suspended ceiling using a
transition plate accessory. See Figs. 10 and 11.

• Mounted into a wall using the wall mounting hardware
accessory. See Fig. 12.

The F90 may also be mounted with lag bolts or threaded
steel rods reaching down to the venturi plate. However,
ensure the bolts or rods are short enough to avoid interfering
with the cells. Assure 1-1/2 threads are visible beyond the
nut.

For F90 installation dimensions, see Fig. 7.

Mounting the F90 Using Lag Screws

1. Locate the ceiling joists. See Fig. 8.

2. Drill four 5/16 in. (8 mm) pilot holes in the joists using

the mounting template to locate holes.

3. Lift the F90 to the mounting location.

4. Mount the F90 using four 3/8 in. x 3 in. (10 mm x

76 mm) lag screws and washers.

NOTE: Assure the washer size is larger than the 3/4 in.

(19 mm) diameter of the keyhole or assure the

mounting screws are secured in the small keyhole
slot.

7

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

1. LOCATE WASH LED CUTOUT BEHIND 
SWITCH COVER ASSEMBLY STICKER.

3. PUSH LED LENS INTO PLACE. 4.

2. USE A KNIFE TO CUT A HOLE IN 
THE STICKER.

INSERT LED INTO LENS FROM BACK 
OF THE SWITCH COVER ASSEMBLY.

5. ATTACH NEW STICKER TO SWITCH 
COVER ASSEMBLY.

68-0103-6 Revised 11-07

6. REINSTALL SWITCH COVER ASSEMBLY 
SCREWS.

Fig. 6. Installing the W ASH LED.

8

M6832

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER





7/8 (22) DIAMETER 
KNOCKOUT


29-1/4
(743)

24
(610)

16
(406)

F90A

29-1/4 (743)

4

(102)

1

24 (610)

16 (406)

2 (51)

9 (229)

LATCHES

24

(610)

29-1/4 

(743)

2

POWER
CORD

5-3/4 (146)

7 (178)

3-1/4
(83)

F90B

19-1/4 (489)

14-1/2 (368)

16

(406)

3 (76)

8

(203)

2

1

KEYHOLE

3/8 (10) DIAMETER

3/4 (19)

3/8 (10) DIAMETER

Fig. 7. F90 installation dimensions in in. (mm).

TYPICAL 2 x 8 INCH

DRILL 5/16 INCH
(8 mm)
PILOT 
HOLES

5/8 INCH (19 mm)
DIAMETER KEY HOLES
PROVIDED IN AIR
CLEANER HOUSING

VENTURI
PLATE

WOOD JOISTS,
16 INCH CENTERS

5-1/2 (140 mm)

3/8 x 3 INCH
(10 x 76 mm)
LAG SCREW AND
WASHER

REMOVE
CELLS
AND
FILTERS


M1533

Fig. 8. Mounting the F90 using lag screws in joist

applications.

ALLOW AT LEAST 16 INCHES (406 MILLIMETERS) FROM

1

FRONT OF F90 TO WALL FOR INSTALLATION AND 
REMOVAL OF CELLS.

2

ALLOW AT LEAST 9 INCHES (229 MILLIMETERS) FROM 
BACK OF F90 TO WALL FOR REMOVAL OF COVER.

M920

Mounting the F90 Using Threaded
Steel Rod

1. Arrange two 2 x 4 supports as shown in Fig. 9.

2. Drill four 5/16 inch pilot holes through the supports

using the mounting template to locate holes.

3. Mount the steel rods to the supports.

4. Lift the F90 to the mounting location.

5. Mount the F90 to the steel rods by attaching the nuts

and washers.

9

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER



2 x 4 INCH (51 x 102 mm)

SUSPENDED
CEILING

OR EQUIVALENT 
CROSS PIECE TO 
SUPPORT AIR CLEANER

NUT AND WASHER
TOP AND BOTTOM

VENTURI
PLATE

NUT AND WASHER
TOP AND BOTTOM

1⁄4 INCH (6 mm)
DIAMETER
THREADED ROD

5-1/2 (140 mm)

REMOVE
CELLS
AND
FILTERS


M1534

Fig. 9. Mounting the F90 using steel rods in suspended

ceiling applications.

Mounting the F90A Using the
272577A Transition Plate
(Accessory)

The transition plate (Fig. 10) allows the F90 to be mounted
by one person. In the two-step process, the mounting plate is
first secured directly to the ceiling joists. Then the F90 is
mounted to the transition plate.

Eight flanged locknuts (four large, four small) and four 3/8 by
3 in. (10 by 76 mm) lag screws are provided with the
transition plate. The four large locknuts adjust the F90 height,
level the F90, and provide stops for the F90 top plate (when
tightened). The four smaller locknuts secure the F90 to the
ceiling joists.

1. Screw a large height-adjusting nut on each stud.
Assure that the large nut is screwed on with its flanged
portion down.

2. Position and level the height adjusting nuts so flanges
are flush with the lag screw heads or the protruding
threaded steel rods.

3. Screw a small securing nut on each stud, leaving a 1/2
in. (13 mm) space between it and the height adjusting
nut.

4. Lift the F90 into position and locate the four studs.

5. Raise the F90 so that the four studs pass through the

keyhole openings.

6. Slide the F90 horizontally so the studs are located at
the slot end of each keyhole opening.

NOTE: As viewed from the F90 or floor side, the slot

portion of each keyhole is above the surface
of the top plate. Position the F90 so the studs
are located at the slot end of each keyhole.
When the securing nuts are tightened, they
should nest firmly in the sockets to prevent
any lateral movement.

SELF-CLINCHING

PEM STUD:

1-1/2 INCHES

1/16 INCH
(2 mm)

7/8 INCH
(22 mm)

7/16 INCH
(11 mm)

SELF-CLINCHING PEM STUDS (4) ON 16 INCH (406 mm) CENTERS,

1

1-1⁄2 INCHES (38 mm) LONG.

7⁄16 INCH (11 mm) DIAMETER HOLES (4) ON 16 INCH (406 mm)

2

CENTERS.

19 x 19 INCH
(483 X 483 mm)

(38 mm)

1

2

16 x 16 INCH
(406 X 406 mm)

M1532

Fig. 10. Mounting F90 using 272577A Transition Plate.

7. Tighten the securing nuts until the F90 top plate

engages the height adjusting nuts.

Mounting the F90 Using the 118636C
Wall Mounting Kit (Accessory)

Two wall mounting brackets are used to support the F90. See
Fig. 11. The two brackets must be mounted on the wall with
16 in. (406 mm) for the F90A or 8 in. (203 mm) for the F90B
between centers so that the lag bolts will align with the F90
mounting holes. Fasten the brackets to the wall studs with
lag screws. On masonry walls, use appropriate screw
anchors.

Wiring

IMPORTANT

All wiring must comply with local codes and
ordinances.

Power Cord

IMPORTANT

The F90, 120 Vac has a standard 3-prong plug on a 10 foot
(3 meter) power cord. There must be a standard grounded
outlet within 10 feet (3 meters) of the F90. The F90, 220/240
Vac power cord terminates in stripped leadwires for
installation of a locally purchased plug.

• Do not use an extension cord to power the F90.

• Keep the power cord out of the reach of building

• Keep the power cord away from water.

• Do not route the power cord near sharp objects that can

Power supply cord must not be concealed above
the ceiling or behind the walls.

occupants.

damage the cord insulation.

68-0103-6 Revised 11-07

10

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

Permanent Wiring

1. Loosen the two screws and remove the plate covering

the wiring compartment.

2. Remove the power cord.

• Cut the black and white wires of the power cord,
leaving six inches from the electrical connector.
Strip 1/2 in. (12 mm) insulation from the end of
each wire.

• Cut the green wire flush with the electrical
connector.

• Remove the power cord and strain relief bushing.

• Install plug (provided) in the hole that contained
the power cord.

3. Attach the conduit to the unit.

4. Run 3-strand, no. 14 wire through the conduit into the

wiring compartment.

5. Wire the F90 using the wiring diagram shown in Fig.

12. Assure the green wire is secured to the green
grounding screw provided.

6. Reinstall the wiring compartment plate and tighten
the screws.

BOLT AND 
WASHER

MOUNT AS CLOSE
TO CEILING AS
POSSIBLE

REMOVE
CELLS
AND
FILTERS


REPLACE REAR LOUVERS WITH BLANK PLATE ON F90 SIDE

1

ADJACENT TO THE WALL.

NUT AND WASHER

VENTURI
PLATE

WALL BRACKET

1

LAG SCREW
BRACKETS TO
WALL STUDS

M1536

Fig. 11. Mounting F90 using 1 18638C Mounting Kit.

CONDUIT

GREEN
(TO GROUND)

+

F90
GROUND 
SCREW

WHITE
FROM F90

WHITE

BLACK

BLACK
FROM F90

M1529

Fig. 12. Wiring F90.

Installing Activated Carbon Filters,
Cells, and Prefilters

1. Insert the activated carbon filters (if used) into the

channel guides closest to the fan.

2. Inspect the cells for broken ionizer wires and bent
collector plates. Moderately bent or warped collector
plates can be bent back into shape. Broken ionizer
wires must be replaced for top efficiency as instructed
on page 15.

3. Insert the cells into the channel guides until they touch
the back stop of the F90. Assure the cell airflow arrow
is pointing toward the fan. In this position, the ionizer
wires are facing downward (away from the fan).

4. Insert the prefilters into the channel guides until they
touch the back of the channels.

11

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

Installing Cover

1. Before installing, study the inside of the F90 cover.

One end has two latches and the other has two hinge
pins. To properly install the cover, connect the hinge
pins to the hinges.

2. Attach the hinge pins by lifting the cover above the
hinge and lowering the pins into the hinges. If the cover
is properly attached, it can hang below the F90.

3. Carefully swing the opposite end of the cover upward
and engage the latches. See Fig. 13. Assure the
latches are connected properly.

Check F90 Operation

 Turn on power.
 Push the test button to assure the power supply is

functioning at all three speeds.

 Use the manual switch on the F90, manual wall switch, or

remote transmitter to assure that the fan runs correctly at
all three speed settings.

 Assure the ON LED lights when the fan is operating.
 Assure the WASH LED (if used) lights when the cells are

removed, grille is closed, and F90 is
turned on.

ADJUSTMENTS

Louver Adjustment

CAUTION

Do not operate air cleaner without the louvers
installed.

The F90 plastic louvers can be repositioned to vary the
airflow pattern. Three positions are available. Position 3
directs airflow along the ceiling. Positions 2 and 1 direct
airflow downward. Use position 2 or 1 if ceiling staining is a
problem or if beams or other obstacles disrupt airflow.

M2364

Fig. 13. Opening and closing F90 cover.

CHECKOUT

Inspect The Installation

Be sure the F90:

 Is securely fastened to the ceiling or wall.
 Does not interfere with normal occupant traffic.
 Is properly oriented for good air circulation.
 Cells are correctly oriented with air flow arrows pointing

toward the fan.

 Prefilters are properly installed below the cells.
 Discharge louvers are securely installed.
 Cover is securely latched.
 SYSTEM light turns on when fan is running.
 Fan stops and ON LED turns off when the cover is

opened.

 Surfaces and the installation area are wiped clean.
 Marked or nicked paint is retouched.

Louvers are shipped in position 1. Louvers can be adjusted
as follows:

1. Loosen screw by turning counterclockwise 2-1/2
turns. Do not remove screw.

2. Push louvers up to disengage bottom tabs, and pull
bottom of the louvers out slightly to desired position.

3. Retighten the screw. Assure that the tabs on the
bottom of the louvers are positively engaged with the
F90 frame.

SERVICE

WARNING

Sharp Edges.
Can cause personal injury.

Wear protective gloves and carefully handle the cells
and prefilters to avoid cuts from the sharp metal
edges, collection plates, and ionizer wires.
Steam, Hot Water, Strong Detergent.
Can cause personal injury.
Wear rubber gloves, eye protection, and rubber apron
for protection from the strong cleaning chemicals and
hot temperatures.

IMPORTANT

The F90 and its components are susceptible to
damage. Be careful when working with them to
avoid equipment damage. Never use an acid base
detergent to wash cells.

68-0103-6 Revised 11-07

12

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

M922A

WEAR GLOVES
TO PROTECT
HANDS FROM
DETERGENT
SOLUTION.

Cleaning the F90

The F90 removes a variety of contaminants from the air. As it
cleans the air, the F90 cells and prefilters become dirty,
lowering the cleaning efficiency. To maintain the F90
reliability and efficiency, regularly clean, inspect, and service
the F90 cells and prefilters.

Clean cells with an alkaline base detergent solution. Soaking
the cells in commercial or home electric dishwasher
detergent, powder or liquid, works well. Use the hottest water
possible (hotter than 160°F (71°C)). If soaking does not clean
the cells, use high velocity detergent spray or steam. Full
service distributors provide a regular cleaning service to
commercial establishments.

The WASH LED (if used) lights when cell washing is
overdue. When the WASH LED lights, wash the cells and
wipe the ionizer wires. Frequent cell cleaning keeps WASH
LED
from lighting.

The F90 needs servicing if it is damaged or if efficiency is
substandard, if abnormal voltages are measured, or if the
CHECK LED lights.

Opening the Cover and Removing
the Cells and Prefilters

Cleaning the Cell Using Alkaline
Base Detergent

WARNING

Hazardous Chemical.
Can cause personal injury.

Wear rubber gloves, eye protection, and a rubber
apron for protection from the strong cleaning
chemicals. Keep detergent solution out of reach
of children.

1. Use a container such as a laundry tub or plastic tank
that is large enough to hold at least one cell.

2. Mix the alkaline base detergent with hot water, carefully
following the instructions on the detergent package.

• Use commercial or home electric dishwasher
detergent (either powder or liquid). Do not use
soap or acid base cleaners or solvents.

• Assure the water temperature is between 150°F
and 190°F (66°C and 88°C).

• If using cold water detergent, follow the
instructions included with the detergent.

NOTE: Cold water detergent cleans less effectively

than hot water detergent.

CAUTION

1. Before servicing the F90, turn off power to
the F90.

2. When servicing the F90, stand on a stable
work platform or ladder.

1. Open the cover by pulling the two latches located on
the front of the cover and swinging the cover down until
it hangs. See Fig. 13.

2. Remove the prefilter and the cell from the channel
guides.

3. Replace the activated carbon filter (if used), if it
needs replacement.

Cleaning the Prefilter

1. Shake out or vacuum the accumulated contaminants

from the prefilter. If necessary, soak the prefilter in
alkaline detergent solution. Do not soak the prefilter in
an acid detergent solution or use high pressure water,
air, or steam to clean the prefilter.

NOTE: Wash the cell before washing the prefilter. If the

prefilter is washed first, lint residue from the prefilter
will contaminate the wash water and deposit inside
the cell. Dispose of the wash water after each use.

Fig. 14. When cleaning cell, agitate in detergent solution.

3. Carefully wipe off ionizer wires before prerinsing.

4. Prerinse the cell in hot water before submerging

in detergent.

5. Soak the cell in the solution for up to 15 minutes.
Agitate the cell in the solution if necessary. See Fig.

14.

6. Remove the cell from the detergent solution.

7. Place the cell in another container of clear hot water

(150°F to 190°F (66°C to 88°C)) for final rinsing. Rinse
the cells for five to ten minutes.

8. Remove the cell from the rinse water. Allow the cell to
drain and dry before energizing. Stand cell on one
corner for optimum water drainage.

13

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

9. Carefully wipe ionizer wires to remove any remaining
residue.

10. Check the collection plates of the cell for any detergent
residue. If any residue is remaining, repeat the rinse
and detergent soaking process until collector plates are
clean. Buildup can reduce the F90 efficiency.

Cleaning the Cell Using High
Velocity Water Pressure or Low
Pressure Steam

Alternate methods can be used to clean some contaminants
from the F90 cell. To prevent damage to prefilter, do not use
these methods to clean the prefilter. See Fig. 15.

Water method—Be careful to avoid damage to the cell. If

detergent is required, use an alkaline base detergent.
Do not use an acid detergent. Aim water straight on or
at a very slight angle when rinsing collector plate side
of cell. This will minimize uneven spacing of collector
plates caused by water pressure.

Steam method—Be extremely careful when steam

cleaning to avoid warping or bending the collector
plates of the cell. Remember that the cell will be hot
after steam cleaning, and be extremely careful to avoid
burns. Use only low pressure or wet steam.

NOTE: Assure the steam pressure is less than 5 psi (35 kPa)

and steam temperature is less than 250°F (121°C).

Discolored Aluminum

After cleaning, the cell and prefilter occasionally look stained.
If the stain is black or very dark, it is probably dirt residue.
This can lower the F90 efficiency. Clean and rinse the cell
and prefilter again.

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riaHlaminAnoituloStnegreteDrehsawhsiD

nobraC

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sliOgnikooC

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).cte,rettub,dral(

ttoCnoituloStnegreteDrehsawhsiD

srebiFno

tsuD

tsuDruolFnoituloStnegreteDrehsawhsiD

liOlareniM

)enocilis

stcudorPrepaPnoituloStnegreteDrehsawhsiD

tniaP

)esaBliO(

esaBretaWnoituloStnegreteDrehsawhsiD

,kcalbpmal,toos,kcalbnobrac(

).ct

noituloStnegreteDrehsawhsiD

*retaWerusserPhgiH

noituloStnegreteDrehsawhsiD

).cte,tunaep,naebyos,e

*maetS

noituloStnegreteDrehsawhsiD

,etanobracmuiclac,eixoidnocilis(

greteDrehsawhsiD

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)sdnuopmocepytlarenimdna

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*retaWerusserPhgiH

tnegreteDrehsawhsiD

noituloS

If the stain is white, it is detergent residue. This lowers the
F90 efficiency and can corrode the aluminum. Rinse the cell
and prefilter again.

If the stain is tan, yellow, or a thin film, it is probably tobacco
smoke or other airborne dirt. Moderate discoloration does not
affect the F90 efficiency. Recleaning is not necessary.

Removing Specific Contaminants
from the Cell

The following list gives the appropriate cleaning procedure
for types of contamination often found on cells and prefilters.
Cleaning procedures are listed in order of preference. Be
careful not to bend cell blades.

Reinstalling the Cell, Prefilter, and
Activated Carbon Filter if Used

1. Wipe off surface dirt inside and outside of the grille and

cover.

2. Replace the activated carbon filters with new filters if
needs replacement. See Fig. 16.

3. Inspect the cells for broken ionizer wires and bent
collector plates. Bend moderately bent or warped
collector plates back into shape. Replace broken
ionizer wires replaced for top efficiency as instructed on
page 15.

sniseRraTeniP

paoSnoituloStnegreteDrehsawhsiD

s

*maetS

edirolhCmuidoSnoituloStnegreteDrehsawhsiD

sraguS

).cte,sessalomsedulcni(

*maetS

claTnoituloStnegreteDrehsawhsiD

ekomSdnasraToccaboTnoituloStnegreteDrehsa

whsiD

sehsinraVnoituloStnegreteDrehsawhsiD

sexaW

)sepytlla(

* Method not appropriate for cleaning prefilter.

4. Carefully wipe ionizer wires to remove any remaining
water deposits.

5. Assure cells are completely dry before reinstalling in
the air cleaner. If cells are placed into the F90 while still
wet, the cells may short out and arc frequently.
Although the F90 will appear to be operating, the cells
may not be cleaning during the drying period.

*maetS

noituloStnegreteDrehsawhsiD

ituloStnegreteDrehsawhsiD

no

noituloStnegreteDrehsawhsiD

68-0103-6 Revised 11-07

14

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

HIGH VELOCITY
DETERGENT SPRAY

STEAM

M677B

Fig. 15. Using high velocity water or steam to clean cells.

M1541

Fig. 16. Reinstalling F90 cells.

REPLACING AN IONIZER WIRE.

6. Slide the cells into the channel guides until they touch
the backstop of the F90. Assure the cell airflow arrow is
pointing toward the fan. In this position, the ionizer
wires are facing downward (away from the fan).

7. Slide the prefilters into the channel guides until they
touch the back of the channels.

8. Swing the cover up until it closes, engaging the two
latches. See Fig. 13.

Replacing Ionizer Wires

Broken or bent ionizer wires can cause an electrical short to
ground, often resulting in visible arcing or sparking. Do not
use cells until broken wires are removed. Cells can be used
temporarily with one wire missing, but replace the wire as
soon as possible. Replacement wires are supplied cut to
length with eyelets on both sides for easy installation. Order
part no. 136434AA. To install:

1. Hook the eyelet on one end of the wire over the spring
connector on one end of the cell. See Fig. 17. Be
careful to avoid damaging the spring connector or other
parts of the cell.

2. Hold the opposite eyelet with a needlenose pliers and
stretch the wire the length of the cell. Depress the
opposite spring connector and hook the eyelet over it.

3. Check the cell for short circuits using an ohmmeter.
See Fig. 18. Check the resistance between the frame
of the cell and both the ionizer and the collector
contacts. In each case, the resistance should be
infinite.

Modifying to Reduce Ozone Odor

In normal operation, the F90 generates a trace amount of
ozone that is considerably under the limit prescribed by the
U.S. Food and Drug Administration (FDA). During the first
week or two of operation, the amount may be higher because
of sharp edges on some of the new high voltage metal parts.
Normal use dulls these edges in a short time.

SPRING 
CONNECTORS

PRESS 
DOWN

EYELETS

IONIZER
WIRE

NEEDLENOSE
PLIERS

TWO EYELETS HOLD IONIZER WIRE TO CELL.

1

1

IONIZER
WIRE

M1540B

Fig. 17. Installing new ionizer wire.

A person with an average sense of smell can detect the odor
of ozone indoors in concentrations as low as 0.003 part per
million (ppm). OSHA workplace regulations permit up to

0.100 ppm ozone concentration. The F90 contributes 0.005
to 0.010 ppm of ozone to the indoor air. The U.S. FDA and
Health and Welfare Canada recommend that indoor ozone
concentration should not exceed 0.050 ppm. As a
comparison, the outdoor ozone level in major cities is
sometimes higher than 0.100 ppm.

15

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER



If desired, the ozone generated by the F90 can be reduced
in one of two ways:

• Install the optional activated carbon filters.

• Open the cover and move the F90 performance switch to
the LO setting. Close the cover. With the switch in LO, the
cleaning efficiency is reduced 5 to 15 percent, depending
on airflow.

NOTE: The performance switch must be set solidly in either

HI or LO position and not between, or the F90 may
not function properly. See Fig. 19.

ELECTRICAL
TROUBLESHOOTING

T ools And Equipment

Troubleshooting the F90 requires:

• Needlenose pliers for stringing ionizer wires and inserting
edge connectors.

• Test meter with 15 kVdc probe.

Troubleshooting Procedure

The F90 troubleshooting charts quickly isolate F90 problems.
See Fig. 20. If removing power box, follow instructions
below. See Fig. 21. For the F90 schematic diagrams, see
Fig. 22 through 25.

WARNING

Electrical Shock Hazard.
Can cause personal injury or equipment damage.

1. Electrical troubleshooting must be performed by

only qualified personnel.

2. The following procedures expose hazardous
levels of electrical current. Disconnect the power
supply between checks and proceed carefully.

AB

COLLECTOR
TERMINAL

IONIZER
TERMINAL

COLLECTOR
TERMINAL

Removing The Power Box

Open the power box and remove the power supply assembly
as follows:

1. Open the cover by pulling the two latches located on
the front of the cover and swinging the cover down until
it hangs. See Fig. 13.

2. Remove the prefilter and the cell from the
channel guide.

3. Loosen the screws holding the power supply assembly
cover plate and remove the cover plate. See Fig. 21.

COLLECTOR
CONTACT

IONIZER
CONTACT

THE FRAME OF
THE CELL SERVES
AS GROUND

Fig. 18. Checking cells for short circuits.

3. Loosen two screws on inner wall of power supply

assembly and three screws on the top of the assembly.
Slide the power supply assembly toward the center of
the air cleaner and disconnect the two Molex
connectors and the one quick disconnect. See Fig. 21.

4. Remove the power supply assembly to a table or
workbench.

68-0103-6 Revised 11-07

M921A

PERFORMANCE

SWITCH

HI

LO

M682

Fig. 19. Setting performance switch in either HI or LO.

16

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER



START

MAKE SURE CELLS 
ARE CLEAN, DRY, 
PROPERLY INSTALLED.

CLOSE COVER OR
DEFEAT INTERLOCK.
TURN AIR CLEANER 
ON. CHECK FAN 
OPERATION AT LO, 
MED, HI SPEEDS.
OBSERVR "ON'' LED.

LED ON/FAN ON

PUSH TEST BUTTON. 
LISTEN FOR 
SNAPPING SOUND.

YES

HOLD DOWN TEST 
BUTTON. IS 
"CHECK" LED LIT?

YES

RELEASE TEST 
BUTTON. IS 
"CHECK" LED LIT?

NO

IS "WASH" LED LIT?

NO

REMOVE CELLS. IS 
"WASH" LED LIT?

YES

AIR CLEANER OK.

REPAIR OR REPLACE 
CELL(S)

NO

WITH OHMMETER, 
CHECK FOR SHORT 
BETWEEN:

- CELL FRAME AND
COLLECTOR 
TERMINAL.

- CELL FRAME AND
IONIZER TERMINAL.

INFINITE RESISTANCE

WARNING

THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO REDUCE RISK 
OF ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN CONTAINED IN THE OPERATING 
INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.

"ON" LED OFF/FAN OFF

"ON" LED ON/FAN OFF

"ON" LED OFF/FAN ON

NO

IS "CHECK" LED LIT?

NO

CHECK INPUT 
VOLTAGE TO LED.

REPLACE POWER 

YES

SUPPLY AND LED 
DRIVER BOARD.

TURN OFF AIR 
CLEANER. SHORT 

YES

IONIZER TO FRAME 
WITH TEST LEAD. 
TURN ON AIR 
CLEANER. IS 
"WASH" LED LIT?

CLEAN CELLS, 
WIPING IONIZER 
WIRES. INSPECT 
CELLS FOR 
DAMAGED IONIZER 
CONTACTS.

REPLACE OR 
REPAIR CELLS.

NO

INSPECT CELLS FOR:

- BENT COLLECTOR 
PLATES

YES

- BROKEN IONIZER 
WIRES

- DIRT ON 
INSULATORS

- DAMAGED IONIZER

NO

OR COLLECTOR 
CONTACT TABS

REPLACE CELLS
CELL 
SHORTED

CELLS OK.

YES

NO

REPLACE LED.

YES

NO

DAMAGED

YES

RISK OF ELECTRIC SHOCK

TURN AIR CLEANER OFF. OPEN COVER. 
DEFEAT INTERLOCK. CHECK FOR INPUT 
VOLTAGE TO SWITCH.

TURN AIR CLEANER OFF. OPEN COVER. 
REMOVE ACCESS PANEL. DEFEAT INTERLOCK. 
TURN AIR CLEANER ON. JUMPER SWITCH 
CONTACTS FOR EACH SPEED IN TURN.

FAN 
OFF

F90B

JUMPER ORANGE 
WIRE TO WIRE FROM 
SPEED CONTROL 
MODULE TO 
FAN MOTOR

FAN 
OFF

REPLACE SPEED 
CONTROL MODULE

TURN OFF POWER. MAKE SURE FAN 
MOTOR ROTATES FREELY. REPLACE 
FAN MOTOR IF NECESSARY.

PUSH TEST BUTTON. LISTEN FOR SNAPPING 
SOUND.

TURN UNIT OFF. OPEN COVER. REMOVE 
ACCESS PANEL. DEFEAT INTERLOCK. TURN 
AIR CLEANER ON. CHECK FOR CORRECT 
INPUT VOLTAGE TO POWER SUPPLY: CHECK 
BOARD TERMINALS P1 AND P2.

NO

CHECK WIRING BACK THROUGH SWITCH, 
INTERLOCK, POWER CORD, 
OUTLET, AND CIRCUIT BREAKER.

FAN 
ON

F90A

FAN 
ON

REPLACE 
SWITCH.

TURN OFF POWER. 
MAKE SURE FAN 
MOTOR ROTATES 
FREELY. REPLACE 
FAN MOTOR IF 
NECESSARY.

REPLACE 
POWER 
SUPPLY.

CORRECT WIRING.

YES

NO

YES

YES

1

TO USE THIS CHART:

1. FOLLOW THE STEPS IN EXACT SEQUENTIAL ORDER. 

2. EACH TIME YOU ISOLATE AND FIX A PROBLEM, GO BACK TO START.

3. REPEAT ALL THE STEPS UNTIL THE AIR CLEANER CHECKS OUT OK.

REPLACE SWITCH.

CHECK INPUT VOLTAGE 
TO INTERLOCK SWITCH.

YES

ADJUST/REPAIR/
REPLACE 
INTERLOCK 
SWITCH.

CHECK WIRING BACK 
THROUGH POWER CORD 
AND OUTLET TO CIRCUIT 
BREAKER OR FUSE.

CORRECT WIRING 
OR FUSING.

HOLD TEST BUTTON 
DOWN; DOES "CHECK" 
LED LIGHT?

NO

REPLACE POWER 
SUPPLY AND LED 
DRIVER BOARD.

NO

YES

CHECK FOR 
VOLTAGE 
TO "ON" LED.

NO

YES

1

REPLACE LED.

1

ELECTRONIC COMPONENTS ON POWER SUPPLY BOARDS ARE NOT FIELD REPLACEABLE. ATTEMPTED SERVICE WILL DAMAGE 
BOARDS . IF TROUBLESHOOTING INDICATES A POWER SUPPLY PROBLEM, REPLACE THE ENTIRE POWER SUPPLY ASSEMBLY.

Fig. 20. F90 electrical troubleshooting procedure.

17

M1525B

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

ELECTRONIC
AIR CLEANER

POWER BOX
SECURING
SCREWS (5)

POWER BOX

POWER BOX COVER

POWER BOX COVER
SECURING SCREWS (5)

NOTE: SCREWS ONLY NEED TO BE
LOOSENED, NOT REMOVED.

M2422A

Fig. 21. Removing the F90 Power Box Assembly .

68-0103-6 Revised 11-07

18



1



























L1

(HOT)

L2

GROUND

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

BLACK COLLECTOR

PERFORMANCE
SWITCH

PUSH BUTTONS

HI

MED

LO

OFF

WHITE

GREEN

P3

BLACK

BLACK

WHITE

WASH
(YELLOW)

ON
(YELLOW)

ON-OFF/3-SPEED FAN SWITCH

WIRING TERMINALS

MED

ORANGEBLACK

2

P4

3

RED

RED

WHITE

ON

HI

LO

J2

2

4

P21 P22

BROWN

VIOLET

BLUE

RED

POWER
SUPPLY

3

1

P2

P1

FAN

MOTOR

WHITE

RED

WHITE

RED IONIZER

CHECK
(RED)

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED. 

2 INTERLOCK SAFETY SWITCH.

3 REPLACE THE BLACK LEADS.


RED

BLACK

TEST
BUTTON

CONTACT
BOARD

M6152

1

L1

(HOT)

L2

GROUND

Fig. 22. F90A 120 V ac model schematic diagram.

PERFORMANCE
SWITCH

BLACK

ON

(YELLOW)

WASH
(YELLOW)

CHECK
(RED)

PUSH BUTTONS WIRING TERMINALS

HI

MED

LO

OFF

BLACK

WHITE

RED

WHITE

RED

WHITE

RED

ON-OFF/3-SPEED FAN SWITCH

ON

MED

LO

ORANGEBLACK

3

BLACK COLLECTOR

BLACK

TEST
BUTTON

CONTACT
BOARD

M11576

POWER
SUPPLY

BROWN

VIOLET

BLUE

RED

P2

P1

FAN

MOTOR

WHITE

P3

P4

J5

HI

RED IONIZER

2

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS 
 AND OVERLOAD PROTECTION AS REQUIRED.

2 LEFT CELL AND CONTACT BOARD ON
 TWO-CELL AIR CLEANER ONLY.

3 INTERLOCK SAFETY SWITCH.




RED

Fig. 23. F90A 120 V ac model schematic diagram.

19

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER





















BLACK COLLECTOR

BLACK

TEST
BUTTON

OFF

MED

1

230 Vac

4

LO

FAN

MOTOR

RED IONIZER

5

WHITE

WHITE

1 TERMINAL BOARD FOR POWER SUPPLY CONNECTIONS.
 POWER SUPPLY. PROVIDE DISCONNECT MEANS 
 AND OVERLOAD PROTECTION AS REQUIRED.

2 BROWN LEAD MUST BE CONNECTED TO TOP 
 TERMINAL ON TRANSFORMER. 

3 INTERLOCK SAFETY SWITCH.

4 PROVIDES ON-OFF INDICATION.

5 LEFT CELL AND CONTACT BOARD ON
 TWO-CELL AIR CLEANER ONLY.

POWER

PERFORMANCE
SWITCH

BLACK

ON

(YELLOW)

WASH
(YELLOW)

CHECK
(RED)

LAMP

HI

BROWN



L

1

N

BLUE

2

3

WHITE

RED

WHITE

BLACK

WHITE

RED

RED

ORANGE

BLACK

A3

A5

A4

A6

B3

B1

B4

B2

C3

C1

C4

C2

D3

D1

D2

D4

ON-OFF/3-SPEED
FAN SWITCH

3

P3

P4

J5

SUPPLY

2

WHITE

BROWN

RED

BLUE

VIOLET

RED

CONTACT
BOARD

M11577

68-0103-6 Revised 11-07

Fig. 24. F90A 230 V ac model schematic diagram (CE compliant model).

20



1













L1

(HOT)

L2

GROUND

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

BLACK COLLECTOR

PERFORMANCE
SWITCH

BLACK

3

BLACK

WHITE

WASH
(YELLOW)

ON-OFF/3-SPEED FAN SWITCH

PUSH BUTTONS WIRING TERMINALS

HI

MED

LO

OFF

WHITE

GREEN

2

ON
(YELLOW)

ORANGEBLACK

RED

RED

WHITE

ON

HI

MED

LO

POWER

2

P21

J2

4

P22

BROWN

VIOLET

BLUE

RED

SUPPLY

3

1

FAN

MOTOR

WHITE

RED

WHITE

P2

P1

SPEED
CONTROL
MODULE

P3

P4

RED IONIZER

CHECK
(RED)

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED. 

2 INTERLOCK SAFETY SWITCH.

3 REPLACE THE BLACK LEADS.


RED

BLACK

TEST
BUTTON

CONTACT
BOARD

M6156

Fig. 25. F90B 120 Vac model schematic diagram.

21

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

REPLACEMENT PARTS LIST/EXPLODED VIEW

See Fig. 26 for exploded view.

rebmuNtraP

.oNnoitpircseD

1

2

3)2/1-21x02(retliferP)2(982202)2(982202

4

5

6)retlif-tsopdna-erp(liaR

7

8ylppuSrewoPetatSdiloSD724802S724802
9hctiwSlortnoCnoitisoP-ruoF283091283091

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11hctiwSecnamrofreP412691412691
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31droCrewoPZQE7404RRE4704
41roticapaCr
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61

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A729202
B729202

703202
803202

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)2(026202

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egraL

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)4(413202

A872

202C872202

A09F

3202

6202

1

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A729202
B729202

70
803202

)2(91
)2(026202

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)4(313202
)4

(413202

Parts and Optional Accessories Not Illustrated

oMllaWC636811C636811

68-0103-6 Revised 11-07

noitpircseD

ylbmessAlortnoCetomeRderiWdraHB790091B790091

egakcap(seriWrezinoIAA434631AA434631

)5fo

ellirGegrahcsiDrofetalPknalB316202316202

)dedivorpetalpknalb(tiKgnitnu

tiKtnuoMgnilieCBAE4704BAE4704

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)mm813x805x31(

A09F

22

rebmuNtraP

A09F

zH06,caV021

)2(416202)2(

416202

zH05,caV042/022

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

7

13

11

4

5

8

6

15

17

3

14

16

12

9

18

10

2

1

M11675

Fig. 26. F90A exploded view. Part numbers are keyed to Parts List.

23

68-0103-6 Revised 11-07

F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER

LIMITED ONE-YEAR W ARRANTY

Air-Pure Systems warrants its air cleaner products to be free from defects in workmanship or materials under normal use and service, for a
period of one (1) year from the date of purchase by the originial end-user. If at anytime during the warranty period the product is defective or
malfunctions, Air-Pure Systems, through the distributor or dealer, from which the product was purchased, or through an authorized warranty
repair station, shall at Air-Pure Systems option, replace or repair the defective product or component.

This warranty does not cover removal or installation costs. This warranty shall not apply if it is shown that the defect or malfunction was
caused by damage which occurred during handling or shipment, improper electrical connections, improper use of the product or abuse.

Air-Pure Systems sole responsibility shall be to repair or replace the product within the terms stated above. AIR-PURE SYSTEMS SHALL

NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER
FAILURE OF THIS PRODUCT. (Some states do not allow the exclusion or limitation or incidental or consequential damages, so this
limitation may not apply to you.). THE WARRANTIES SET FORTH HEREIN ARE EXCLUSIVE AND AIR-PURE SYSTEMS EXPRESSLY
DISCLAIMS ALL OTHER WARRANTIES, WHETHER WRITTEN OR ORAL, IMPLIED OR STATUTORY, INCLUDING BUT NOT
LIMITED TO ANY WARRANTIES OR MERCHANTABILITY, WORKMANSHIP, OR FITNESS FOR A PARTICULAR USE.

This warranty gives you specific legal rights and you may have other rights which vary from state to state.

How to make a warranty claim or have questions answered:

Should you have a warranty claim or questions about the warranty policy, contact the distributor or dealer from which you purchased the
product or the authorized warranty repair stations nearest your location.

NOTE: Do not return any products or parts to the factory without a factory issued "Return Warranty Good Label" issued by Air-Pure
Systems.

In the event you or other persons, have any questions concerning the use and care of this product of this warranty please call or write the
factory.

Air-Pure Systems

16873 Fish Point Rd. SE
Prior Lake, MN 55372-1714
Phone: [phone]
Fax : [phone]

Air-Pure Systems

16873 Fish Point Rd. SE
Prior Lake, MN 55372-1714
Phone: [phone]
Fax: [phone]

68-0103-6 Revised 11-07

24

www.cleanairfacility.com