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Installation

Instructions

ELECTRONIC

AIR

CLEANER

907

Sizes

12,

16,

24

Series

B

brqant

INTRODUCTION

The

Bryant

Model

907

Series

A

Electronic

Air

Cleaner

is

available

in

three

sizes:

12-907

(1200

Cancels:

39907D6

I

39907D7

8/15/72

CFM),

16-907

(1600

CFM),

and

24-907

(2400

CFM).

They

are

designed

for

use

with

residential

and

light

commercial

forced-air

heating

and/or

cooling

systems

and

can

be

installed

in

a

vertical

or

horizontal

sec¬

tion

of

a

typical

return

air

duct

system.

The

electronic

components

of

the

unit

convert

the

120

VAC

of

the

power

supply

to

7200

VDC

which

imparts

an

electrical

charge

to

airborne

particles

such

as

smoke,

bacteria,

pollen,

and

dust.

These

charged

par¬

ticles

are

then

attracted

by

the

dust-collecting

media,

thus

purifying

the

airstream.

The

electronic

air

cleaner

consists

of:

1.

A

cabinet

containing

the

air

cleaning

assembly.

2.

A

power

door

assembly.

See

Figure

2.

CABINET.

A

casing

encloses

three

sections

that

make

up

the

air

cleaning

assembly.

These

sections

are:

1.

Mechanical

prefilter.

An

expanded

metal

first-

stage

filter

that

removes

lint

and

larger

dust

particles.

2.

Ionizer

section.

Consists

of

tungsten

wires

(that

receive

a

positive

charge)

mounted

between

grounded

steel

channels

and

supported

by

polyester,

glass-

reinforced

insulators.

3.

Collector

section.

Consists

of

two

grounded

wire

grills

and

one

center

plate

(that

receives

a

positive

charge)

with

two

fiber

glass

dirt

collecting

“media”

pads,

one

on

either

side

of

the

center

plate.

See

Figure

11.

POWER

DOOR

ASSEMBLY.

See

Figure

10.

The

door

assembly

consists

of:

1.

A

power

indicator

light,

ON-OFF

switch,

and

lock

knob

installed

on

the

door

cover.

2.

A

door

base

plate

contains

an

encapsulated

power

pack,

a

surge

resistor,

and

wiring

that

are

mounted

internally.

A

line

voltage

disconnect

(male

plug)

and

high-voltage

spring

bus-bar

is

mounted

on

the

base

plate

externally.

Six

screws

must

be

removed

to

ex¬

pose

the

power

pack

and

wiring.

Power

Pack.

The

supply

circuit

to

the

power

pack,

which

is

wired

across

the

system

air

blower,

is

con¬

trolled

by

an

ON-OFF

power

switch.

With

the

power

switch

ON

(assuming

power

door

locked

and

air

GROUNDED

PLATE

REPLACEABLE

COLLECTING

PAD

POSITIVELY

CHARGED

GRID

REPLACEABLE

COLLECTING

GROUNDED

PLATE

IONIZER

PREFILTER

DUST-LADEN

RETURN

AIR

INDICATOR

LIGHT

CASED

POWER

PACK

A68175

Figure

2—Air

Cleaner

Components

—

ELECTRICAL;'!

•ENTRANCE

'

&

fe

H

fill

I

ISIIf

f

/

:

,T-

„

4

4

h~

ON-OFF/f

SWITCH

^

REMOVABLE

POWER

DOOR

N

INDICATOR

LIGHT

A70003

Figure

3—Dimensional

Drawing

TABLE

(—DIMENSIONS

Model

A

C

D

E

12-907

31-1/4

20-3/16

17-11/16

24’

16-907

31-1/4

25-11/16

23-3/16'

24

*

24-907

33-1/4

31-3/16

28-11/16

26

TABLE

II—PHYSICAL

DATA

Model

12-907

16-907

24-907

Air

Volume

Range

CFM

600-1200

800-1600

1400-2400

•

Filter

Area

Face

area

sq

ft

3.37

4.36

.

5.76

.

Nominal

size

in.

18x25

24

x

26

30

x

28

Electrical

Data

Input

(to

power

door)

120

volts

AC,

single

phase,

60

Hertz

Output

to

unit

7200

volts

DC,

1„7

Milliamp.s

Approx

Shipping

Weight

lbs

48

54

*

61

TABLE

III—PRESSURE

DROP

AT

VARIOUS

AIRFLOWS

12-907

16-907

24-907

CFM

Pressure

Drop

Inches

wc

CFM

Pressure

Drop

Inches

wc

CFM

'

Pressure

Drop

Inches

wc

600

0.05

800

0.05

1400

0.09

*

700

0.07

1000

0.08

1600

/

:

'

0.12

•

800

0.085

1200

0.11

1800

0.45

‘

900

0.107

1400

0.15

.

2000

.

.

0.1.8

1000

0.13

1600

0.19

2200

.

.

0.22:

1100

0.16

2400

,,..026

s

\

1200

0.19

,

_

.

1

Note:

Using

the

electronic

air

cleaner

on

air

duct

systems

designed

for

airflows

lower

than

600

CFM

for

Model

12-907,

800

CFM

for

16-907,

and

1400

CFM

for

24-907

is

not

recommended.

12

/

1

6

/

24/907

-

2

-

blower

operating),

120-VAC

zb

10%

single

phase,

60-Hz

current

is

applied

to

the

power

pack

trans¬

former.

The

output

of

the

transformer

secondary

is

approximately

3600

VAC

and

alternately

charges

two

capacitors

through

two

silicon

rectifiers.

The

total

charge

across

both

capacitors

results

in

a

power

pack

output

of

approximately

7200

VDC;

therefore,

the

cir¬

cuit

is

classed

as

a

voltage

doubler

circuit.

NOTE:

Power

packs

are

completely

encapsulated

and

not

field

repairable.

The

surge

resistor

is

ex¬

ternal

to

the

power

pack

and

can

be

readily

replaced

in

the

field.

Installation

of

the

Model

907

consists

of

the

following

steps

(sections):

I.

L

o

c

a

t

ing

the

Unit

II.

C

o

n

necting

the

Air

Ducts

III.

Making

Electrical

Connections

IV.

Start-up

and

Adjustment

In

addition,

the

following

sections

are

also

included:

V

Maintenance

VI.

Recommended

Service

Procedures

IMPORTANT—Read

1.

Check

local

codes

and

ordinances

for

additional

requirements

pertaining

to

installation

of

unit.

2.

Check

electrical

pow;er

supply

to

building

to

be

sure

rated

voltage,

frequency,

and

phase

correspond

to

that

on

unit

rating

plate.

Before

Installing

3.

Because

Model

907

cleans

only

air

brought

to

it

by

system

blower,

run

blower

continuously,

or

as

much

as

possible—summer

and

winter.

4.

Do

not

block

air

outlets

and

returns

with

draperies

or

furniture.

A68176

Figure

4—Typical

Upflow

Furnace

Installation

Figure

5—Typical

Basement

Furnace

Installation

TRANSITION

TO

ACCOMMODATE

Figure

7—Typical

Horizontal

Furnace

Installation

Figure

6—Typical

Downflow

Furnace

Installation

-3-

12/16/24/907

I.

LOCATING

THE

UNIT

Figures

4,

5,

6,

and

7

show

the

air

cleaner

in

the

return

air

duct

of

some

typical

furnace

installations

with

and

without

air

conditioning.

Other

methods

of

installing

the

unit

are

permissible

if

the

design

procedure

outlined

in

the

Product

Data

Sheet

is

observed.

When

planning

an

installation,

consider

the

following:

1.

The

air

cleaner

is

approved

only

for

indoor

installa¬

tion.

If

an

outdoor

installation

is

used,

the

unit

must

be

housed

in

a

weatherproof

enclosure.

2.

The

air

cleaner

may

be

placed

on

its

right

or

left

side

in

a

vertical

or

horizontal

position.

It

must

be

in¬

stalled

on

the

inlet

air

side

of

the

heating

and/or

cooling

unit.

Be

sure

that

the

airflow

through

the

air

cleaner

is

in

the

same

direction

as

the

airflow

arrow

indicates.

standing

flanges

on

the

air

cleaner

casing.

This

per¬

mits

a

greater

range

of

application.

If

flanges

are

needed,

“L”-shaped

standing

seam

duct

cleats

can

be

used

for

connecting

the

ductwork,

or

to

position

the

furnace

on

top

of

the

air

cleaner.

All

downstream

connections

must

be

properly

sealed

to

prevent

in¬

filtration

of

unfiltered

air.

Airflow

across

the

air

cleaner

must

be

uniform

for

best

results.

Turning

vanes

should

be

installed

if

the

air

cleaner

is

installed

close

to

an

elbow.

Depending

Figure

8

Power

Door

Packing

A70013

3.

Allow

a

minimum

of

30

inches

clearance

in

front

of

the

unit

for

cleaning

and

maintenance.

4.

The

air

cleaner

should

never

be

used

to

collect

grease

or

other

flammable

contaminants.

5.

If

a

humidifier

is

used,

moisture

should

be

intro¬

duced

downstream

from

the

air

cleaner.

II.

CONNECTING

THE

AIR

DUCTS

Dispose

of

existing

mechanical

furnace

filters.

They

are

not

required.

Move

ON-OFF

switch

to

OFF

and

unlock

the

power

door

by

rotating

the

knob

(approxi¬

mately

10

turns

counter-clockwise)

until

the

door

is

free.

Grasp

the

power

door

by

the

knob

and

the

door

handle

and

remove

it

from

the

cleaner

casing

by

pulling

it

towards

you.

This

motion

disengages

the

120-V

power

supply

connector.

Remove

and

discard

the

cardboard

packing

taped

to

the

inside

surface

of

the

door.

See

Figure

8.

Slide

out

all

three

sections.

See

Figure

9.

Note

there

are

no

LINE

VOLTAGE

DISCONNECT

COLLECTOR

PREFILTER

IONIZER

POWER

DOOR

A70008

Figure

9—Power

Door

Removed

from

Air

Cleaner

12/16/24/907

-

4

-

on

the

size

of

the

furnace,

it

may

or

may

not

be

necessary

to

reduce

the

ductwork

on

the

leaving

air

side

of

the

air

cleaner.

Whatever

the

application,

a

3

to

1

duct

reduction

ratio

should

be

maintained

(3

inches

of

duct

length

for

every

1

inch

reduction

in

size).

NOTE:

Do

not

baffle

off

any

portion

of

the

entering

air

side

of

the

cleaner.

When

changes

in

duct

size

would

be

too

abrupt,

an

alternate

horizontal

position

may

be

used,

as

illustrated

in

Figure

5.

For

best

results,

use

multiple

return

air

grills

located

at

or

near

floor

level.

Higher

cleaning

efficiencies

and

lower

blower

operating

costs

are

obtained

by

limiting

the

filter

face

velocity

to

350

ft/min.

III.

MAKING

ELECTRICAL

CONNECTIONS

1.

With

power

door

removed,

remove

junction

box

cover

located

above

female

plug

on

casing

center

channel.

2.

Air

cleaner

casing

has

a

top

line-voltage

entrance

hole.

Use

hole

(install

strain

relief)

to

run

two-wire

with

ground

electric

cable

into

position

for

making

connections

at

female

plug.

3.

Connect

power

leads

to

black

and

white

pigtails

extending

from

female

plug,

using

wire

nuts

provided.

4.

Connect

ground

to

green

pigtail

extending

from

female

plug

box,

using

wire

nut

provided.

Replace

junction

box

cover.

5.

Slide

prefilter,

ionizer,

and

collector

sections

into

casing.

6.

Replace

power

door

by

first

inserting

bottom

tab

into

place

on

bottom

edge

of

door

opening.

Push

top

of

door

and

guide

lock

knob

screw

(Figure

10)

into

threads.

Turn

knob

clockwise

until

screw

engages

threads

in

casing.

Continue

turning

knob

clockwise

until

door

is

securely

locked.

7.

Use

proper

wiring

diagram

for

single-or

multiple-

speed

blowers.

If

cleaner

is

wired

to

a

multi-speed

direct

drive

motor,

it

must

be

isolated

by

a

relay.

3.

Check

to

see

if

amber

indicator

light

is

glowing.

This

indicates

proper

unit

operation.

4.

Adjust

airflow

to

no

more

than

350

ft/min.

This

can

be

done

with

velometer

or

as

described

in

filter

flag

instruction

(optional).

V.

MAINTENANCE

Because

normal

maintenance

(cleaning)

is

so

simple,

most

homeowners

will

choose

to

personally

perform

the

necessary

operations.

Clean

the

unit

where

dust

from

the

media

pads

will

not

soil

carpets

or

the

floor.

To

gain

access

to

the

prefilter,

ionizer

and

collector

filter

stages,

simply

push

power

switch

to

OFF

position

and

remove

the

power

door

as

outlined

previously.

Lay

it

off

to

one

side.

Pull

out

the

first-

stage

prefilter

and

vacuum

from

entering

air

side,

or

wash

in

detergent

and

water.

Let

dry

thoroughly.

Re¬

install.

Do

not

spray

prefilter

with

any

filter

coatings.

Collector

pads

should

be

replaced

every

3

months

or

whenever

indicated

by

the

optional

filter

flag

or

monitor

panel.

This

time

interval,

of

course,

will

vary

with

service

conditions.

IV.

START-UP

AND

ADJUSTMENT

A70120

1.

Move

switch

on

power

door

to

ON.

Figure

10

Power

Door

Internal

Detail

2.

Set

thermostat

to

start

blower.

ON-OFF

ENCAPSULATED

POWER

PACK

LOCK

KNOB

SCREW

COVER

INDIC

soCKET

G

H

T

TO

PRIMARY

WINDING

INDICATOR

LIGHT

WIRES

-

5

-

12

/

1

6

/

24/907

WIRE

GRILL

To

replace

the

media

pads:

1.

Slide

collector

section

(Figure

11)

from

unit

and

place

it,

yellow-side

down,

on

a

piece

of

paper

(should

be

more

than

twice

as

large

as

collector)

laid

out

on

a

flat

surface.

2.

Deflect

spring

clips

downward,

lift

wire

grill

and

pivot

it

upward

enough

to

remove

dirty

media

pad.

Place

soiled

pad

to

one

side.

3.

Place

clean

pad

on

perforated

center

plate

of

collector

frame.

Pad

should

completely

cover

center

plate

and

insulators.

4.

Pivot

wire

grill

downward

and

deflect

spring

clips

until

grill

is

engaged.

5.

Turn

collector

section

over

and

repeat

steps

2,

3,

and

4

to

change

other

media

pad.

NOTE:

For

best

results,

do

not

clean

and

reuse

dirty

media

pads.

They

can,

however,

be

reused

tem¬

porarily

by

vacuuming

or

shaking

out

accumulated

dust.

Pads

can

be

vacuumed

through

the

wire

grill.

Use

brush

attachment

of

cleaner.

6.

Slide

collector

section

on

its

track

completely

into

casing.

7.

Roll

up

dirty

pads

and

paper

and

dispose

of

them.

The

ionizer

assembly

should

be

cleaned

at

the

start

of

each

heating

and

cooling

season

by

using

the

long

brush

attachment

of

a

vacuum

cleaner;

manually

by

using

a

soft,

long

bristled

brush;

by

wiping

the

plates

with

a

damp

cloth;

or

by

a

combination

of

these

three

methods.

Care

must

be

taken

not

to

break

the

ionizer

wires

or

bend

the

ionizer

plates.

as

damage

may

result

After

cleaning

and

reassembly

of

components,

rein¬

stall

the

power

door.

Make

sure

that

door

is

securely

locked.

Move

power

switch

to

ON.

Unit

is

now

ready

for

operation.

VI.

RECOMMENDED

SERVICE

PROCEDURES

Tools

required

for

servicing:

Jumper

cord,

1-wire

12/16/24/907

A70119

Figure

11—Collector

Section

Components

Jumper

cord,

3-wire

Voltmeter

(capable

of

measuring

up

to

10,000

VDC)

Screwdriver,

slotted

head

Pliers,

long

nose

1.

MALFUNCTIONS

THAT

PREVENT

INDICATOR

LIGHT

OPERATION

A

glowing

indicator

light

indicates

that

the

power

pack

is

energized

and

that

the

proper

DC

voltage

is

being

supplied

to

the

air

cleaner.

If

the

light

is

off,

make

the

following

checks:

A.

CHECK

PRIMARY

VOLTAGE.

If

the

primary

voltage

does

not

read

between

108

and

132

VAC

at

the

outlet

receptacle

(female

plug)

on

the

casing

cen-

terpost,

check

the

120-VAC

power

source.

If

the

voltage

reading

at

the

centerpost

receptacle

is

within

the

120-VAC

±

10%

range,

check

further

to

isolate

the

problem

to:

1.

Power

door

2.

Indicator

light

-

6

-

B.

CHECK

CABINET

ASSEMBLY

1.

Make

sure

all

components

are

correctly

assembled

as

shown

in

Figure

2.

2.

Turn

ON-OFF

switch

to

OFF.

3.

Remove

power

door.

4.

I

n

s

tall

3-wire

jumper

cord

from

male

(line

voltage

disconnect)

plug

on

power

door

to

female

plug

on

casing

centerpost.

See

Figure

12.

5.

M

o

ve

ON-OFF

switch

to

ON.

a.

If

indicator

light

does

not

glow,

proceed

to

check

high-voltage

output,

indicator

light,

and

encapsulated

power

pack.

b.

If

indicator

light

glows,

check

out

ionizer

and

collector

sections

for

possible

short.

Move

switch

OFF;

clip

jumper

between

bus-bar

(on

base

plate)

and

“T”

handle

on

section

testing.

Push

switch

ON.

If

indicator

light

glows

when

section

is

energized

separately,

section

is

good.

If

light

does

not

glow,

sec¬

tion

is

shorting

out.

If

either

section

is

defective,

refer

to

Step

6a

and

6b

that

follow

for

corrective

action

procedures.

If

both

collector

and

ionizer

pass

their

checkouts,

look

for

trouble

in

the

power

door.

Be

sure

to

push

switch

OFF

and

remove

jumper

cord

before

proceeding

to

check

filter

sections

and

power

door.

6a.

Check

out

ionizer

section

for:

(1)

E

x

c

essive

dirt

on

ionizer

wires

or

ionizer

chan¬

nels.

Clean

with

vacuum

cleaner

brush.

If

necessary,

use

cloth

dampened

in

detergent

and

water

solution.

(Dry

thoroughly

before

reassembly).

(2)

Bowed

or

dented

ionizer

channels.

Make

sure

channels

are

approximately

parallel.

Wires

should

be

spaced

at

least

3/8

inch

from

channels.

Straighten

channels

if

necessary.

(3)

Broken

or

loose

ionizer

wires.

Replace

wires

using

long-nosed

pliers,

as

shown

in

Figure

14.

Place

terminal

on

one

end

of

wire

in

notch

in

ionizer

bus¬

bar.

Grasp

terminal

on

other

end

of

wire

with

pliers

and

pull

wire

firmly.

Depress

ionizer

bus-bar

with

screwdriver

until

you

can

fit

wire

into

notch

on

bus¬

bar;

position

terminal

on

bus-bar,

then

remove

screwdriver

pressure

on

bus-bar.

A70011

Figure

12—Checking

Indicator

Light

(4)

Broken,

cracked,

or

loose

insulator

or

in¬

sulators.

Replace

complete

ionizer

section.

(5)

Broken

spotwelds

between

ionizer

channels

and

center

ground

strap.

Refasten

strap

to

channel

with

pop

rivet

or

sheet

metal

screw.

6b.

Check

out

collector

section

for:

(1)

Dirty

media

pads.

Clean

or

replace.

Reassem¬

ble

collector

section.

Indicator

light

should

now

glow

if

dirty

pads

were

problem

source.

(2)

Bent

grills

or

perforated

center

plate.

Straighten.

(3)

Broken,

cracked,

or

loose

insulator

or

in¬

sulators.

Replace

collector

section.

-

7

-

12

/

1

6

/

24/907

C.

C

H

E

C

K

HIGH-VOLTAGE

OUTPUT.

If

the

ON-

OFF

light

still

will

not

glow

and

it

has

been

deter¬

mined

that

the

trouble

is

not

in

the

cabinet

assembly,

proceed

to

check

the

high-voltage

output

as

follows:

1.

Remove

base

plate

from

power

door.

2.

Disconnect

surge

resistor

from

terminal

on

base

plate.

See

Figure

10.

3.

Install

3-wire

jumper

cord

from

male

(line

voltage

disconnect)

plug

on

casing

centerpost.

See

Figure

12.

4.

Push

ON-OFF

switch

ON.

If

light

glows,

trouble

is

isolated

to

high-voltage

terminal,

surge

resistor,

broken

or

damaged

bus-bar

insulators.

D.

C

HECK

INDICATOR

LIGHT.

If

the

indicator

light

still

does

not

glow

when

the

high-voltage

wire

is

disconnected

from

the

bus-bar

on

the

base

plate,

check

the

voltage

supplied

to

the

light

as

follows:

1.

D

i

sconnect

light

leads

at

light.

TOUCH

SCREWDRIVER

TO

CASING

A70010

Figure

13—Checking

High-Voltage

DC

Supply

2.

Energize

encapsulated

power

pack

and

measure

voltage

across

light

leads.

Reading

must

be

90

to

130

VDC.

3.

If

voltage

is

within

tolerance,

indicator

light

is

defective.

Replace.

E.

CHECK

ENCAPSULATED

POWER

PACK.

See

Figure

10.

If

the

voltage

supplied

by

the

power

pack

to

the

indicator

light

is

less

than

60-90

VDC

when

the

high-voltage

wire

is

disconnected

from

the

bus-bar

and

the

power

pack

is

energized:

1.

Power

pack

has

defective

circuit.

2.

Check

terminal'

on

surge

resistor

for

high-voltage

output

of

power

pack.

Voltage

must

read

7500-9000

VDC

with

surge

resistor

disconnected

from

bus-bar.

With

air

cleaner

components

energized,

operating

voltage

is

approximately

7200

VDC.

If

meter

is

not

available

for

a

voltage

measurement,

ground

blade

of

an

insulated

handle

screwdriver

against

grounded

base

plate

and

move

blade

tip

towards

surge

resistor

terminal.

See

Figure

13.

A

spark

should

occur

at

a

gap

of

1/8

to

3/16

inch

between

terminal

and

screwdriver

tip,

indicating

potential

of

approximately

8000

VDC.

3.

Encapsulated

power

pack

is

defective.

Replace.

F.

CHECK

SURGE

RESISTOR.

De-energize

the

power

pack

and

check

the

surge

resistor

in

place

on

the

power

pack.

See

Figure

10.

The

measurement

should

be

15,000

ohms,

30

watts.

Replace

if

shorted

or

open.

A

shorted

resistor

does

not

properly

protect

the

power

pack.

An

open

resistor

means

that

the

high-voltage

cord

and

air

cleaner

components

are

not

receiving

high-voltage

power.

G.

CHECK

FOR

HIGH-HUMIDITY

SHORTING.

During

periods

of

high

(over

80

percent)

relative

humidity,

there

exists

a

possibility

that

the

two

nor¬

mally

nonconductive

media

pads

can

absorb

enough

moisture

to

support

conduction

between

the

high

positive

potential

center

plate

of

the

collector

section

and

the

two

grounded

grills.

The

result

is

excessive

current

draw

and

the

collapse

of

transformer

voltage.

The

indicator

light

goes

out.

Continuing

operation

of

the

blower

in

the

system

should

dry

out

the

pads

to

stop

center

plate-to-grill

conduction.

The

high

voltage

will

be

restored

and

the

indicator

light

will

glow

again.

Humidifiers,

when

used,

should

be

installed

down¬

stream

from

the

air

cleaner

to

avoid

the

possibility

of

high-humidity

shorting.

2.

HUMMING

NOISE

Check

for

the

following:

A.

Improper

wiring

connections.

B.

Loose

ionizer

wires.

Repair

or

replace.

C.

Excessively

dirty

ionizer

or

collector

section

(in¬

cluding

media

pads).

Clean.

12

/

1

6

/

24/907

-

8

-

3.

C

O

N

S

T

ANT

OR

INTERMITTENT

ARCING

Check

for:

A.

Loose

or

defective

ionizer

wire

or

wires.

Repair

or

replace.

B.

Excessively

dirty

ionizer

or

collector

section

(in¬

cluding

media

pads).

Clean.

C.

Foreign

matter

such

as

string

lodged

in

or

close

to

ionizer

section

and

flapping

in

airstream.

Remove.

D.

Bent

ionizer

channels.

Straighten

if

possible;

if

unable

to

straighten,

replace

ionizer

section.

E.

Broken

insulators

in

either

ionizer

or

collector

section.

Replace

ionizer

or

collector

section.

F.

Dents

in

one

or

both

collector

section

wire

grills.

Straighten

if

possible;

if

not,

replace

grill.

G.

Improperly

positioned

media

pad.

Reposition.

H.

Supply

voltage

exceeding

132

VAC.

Change

power

pack

supply

lead

to

low

tap.

I.

Vibration

from

external

source.

Eliminate

vibration

source

or

isolate

air

cleaner.

Figure

14—Replacing

Ionizer

Wire

4.

A

I

R

NOT

BEING

CLEANED

Be

sure

indicator

light

is

glowing,

showing

proper

electrical

operation.

Check

for:

A.

No

power

to

ionizer

and

collector

sections.

Check

for

proper

contact

between

bus-bar

on

power

door

and

“T”

handles

on

ionizer

and

collector

sections.

B.

Airflow

through

unit

set

too

high.

Use

velometer

to

adjust

to

no

more

than

350

ft/min.

C.

Leaks

in

ductwork,

blower

box,

and

other

parts

of

system

under

negative

pressure

on

clean

air

side

of

air

cleaner.

Seal

leaks

with

duct

tape

or

caulking.

D.

Dirty

air

not

being

delivered

to

the

cleaner

as

result

of

blocked

return

air

grills.

Remove

drapes,

furniture,

or

any

other

obstruction.

E.

Uneven

air

distribution

across

face

of

unit.

Install

turning

vanes

or

air

baffles

to

even

air

distribution.

An

even

collection

of

dirt

across

entering

side

of

a

media

pad

indicates

good

distribution.

5.

R

ADIO

OR

TV

INTERFERENCE

Check

for:

A.

Improper

grounding.

Ascertain

that

power

pack

has

good

electrical

ground.

B.

Supply

line

voltage

ground

line

not

properly

grounded.

Correct.

C.

Loose

ionizer

wires.

Replace.

D.

Foreign

particles

lodged

in

ionizer

section.

Remove.

E.

Loose

connections

on

components

or

primary

wiring

within

power

door.

Tighten

connections.

F.

Defective

power

pack.

Replace.

G.

Dents

in

one

or

more

grills

or

center

plate.

Straighten

or

replace.

H.

Damaged

media

pad.

Replace.

I.

Improperly

installed

pad.

Reposition.

6.

W

HITE

DUST

“White

dust”

may

be

noticed

on

furnishings,

especially

when

the

cleaner

first

begins

to

function.

It

is

especially

noticeable

on

dark

furniture.

“White

dust”

is

largely

composed

of

lint,

which

because

of

its

weight

settles

before

it

reaches

the

air

returns.

The

amount

of

lint

generated

is

increased

by

new

fur¬

nishings

or

draperies

and

the

activity

of

children

and

pets.

Large,

clean

lint

particles

have

no

staining

or

soiling

properties.

SEQUENCE

OF

OPERATION

When

system

blower

is

in

operation,

power

pack

(IB)

is

energized

with

120-V±

10%

single

phase,

60

Hz

AC

current.

-

9

-

12

/

16

/

24/907

The

enclosed

power

pack

transformer

secondary

out¬

put

of

approximately

3600

VAC

alternately

charges

two

capacitors

through

two

silicon

rectifiers.

The

total

charge

across

both

capacitors

results

in

a

power

pack

output

of

approximately

7000-7500

VDC.

Current

from

the

enclosed

power

pack

flows

through

the

surge

resistor

(11A)

and

energizes

the

ionizer

sec¬

tion

(4F1)

and

collector

section

(4F2).

LEGEND

IB

-

Power

Pack

4F1

-

Ionizer

4F2

-

Collector

11

A-

Surge

Resistor

11D

-

Earth

or

Water

Ground

HE

-

Chassis

Ground

11F

-

Indicator

Light

LOW-VOLTAGE

TERMINAL

STRIP

(BRYANT)

;

M

ODEL

850

COMFORT

PROGRAMMER

NON-BRYANT

:

*

COMMON

SIDE

OF

TRANSFORMER

**

TERMINAL

FOR

HEATING

SIDE

OF

THERMOSTAT

***

TERMINAL

FOR

COOLING

SIDE

OF

THERMOSTAT

Figure

17—Wiring

Diagram

of

Model

850

Comfort

Programmer

Used

to

Control

Model

907

19/-|R/9d/<M17

-

1

0

-