Carrier 38AB Dimensions and installation guide

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8

Table of contents

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Carrier

and

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Instructions

38AB.AD

024thro

084

Air-Cooled

Condensing

Units

Table

1

—

Dimensions

UNIT

38AD

38AD

024

028

38AD

034

38AD

044

38AB

054

38AB

064

38AB

084

DIMENSIONS

(Ft—in

i.)

Length

A

o

1

CO

12-10%

24-

-4

24-4

Width

B

3-11%

4-10%

6-

0‘/

4

3-11%

4-10%

6-

0%

Height

w/o

Legs

C

2-

4%

3-

r/

8

3-

2

2-

4%

3-

r/

8

3-

1%

Leg

Height

D

1-0

or

2-0

1

—6

or

2—2

1-

8

1

-4

or

2-0

1-6

or

2-2

1

_8

or

2—

Mtg

Holes

<

J

O

1

sC

o

1

0-

1%

2—%

0-

1%«

0-

1%6

0-

1%

Corner

Legs

Ik

3-

8%

3-

8%

4-

7%

5-

7%

00

1

CO

4-

7%

5-

9%

o

i

o

o

1

o

o

1

o

2-%

o

1

o

o

I

o

o

I

o

Middle

Legs

Ik

3-10

1

3-10

00

1

xr

5-

7%

CO

1

o

CO

1

XT

5~ioy

2

L

3-3%

3-

7%

6

9-4%

M

9-4%

00

o

5-3%

N

|

1

-

-

9-5%

CONNECTIONS

(in

.)

Suction

(ODM)

l-%

2-%

2-V

Liquid

(ODM)

%

7

/s

1

—%

OPENINGS

(in.)

Suction

E

2-%

4

5

(2)5

Liquid

F

1-

%

I

1-

%

1

i-

%

2

2-%

3

7/

Control

(4

holes)

G

%

1

—

5

4

1

k

Power

H

3-%

5

s-%

(2)3%

*Unit

38AB084

has

two

suction

connections

AIR

FLOW

GUSSET

-pf

REMOVABLE

,

n

o

.

HINGED

CONTROL

TOP

COVER

BOX

DOOR

\oNLY)

2

NI

t

Y)

REQUIRED

OVERHEAD

FL0W*\Ef/

F

/

E

Al

5

ff

ACE

38AD024

028,

034

A

^tt

w

i

Ckii

mm

'4-0

(BOTH

SIDES)

4-0

*.,

(BOTH

SIDES)"

-REMOVABLE

END

PANELS

HINGED

ACCESS

DOOR-

REQUIRED

OVERHEAD

CONTROL

BOXi

~

AIR

SPACE

AIR

FLOW

GUSSET

P"

A>

;_HINGED

POWER

:

BOX

DOOR

‘

4-0"(BOTH

SIDES)

38AD044

4

1

-

o"——

(BOTH

SIDES)

REMOVABLE

END

PANELS

AIR

FLOW

BOTTOM

PANELREMOVABLE

REAR

OPENINGPANEL

f

Px^Removable

top

requi

Ilf(

COVER

OVER!

FLOW

AIR

SI

HINGED

AIR

control

V

box

covers

/^REMOVABLE

TOP

REQUIRED

/

COVER

OVERHEAD

^^

•

AIR

FLOW

AIR

SPACE

38AB054,

064,

084

O'

I?

\i

4-0

X;

(BOTH

SIDES)

'X

4

-

0

"

(BOTH

SIDES)

AIR

FLOW

THRU

CONDENSER

11

SPACE

FOR

SERVICE

AND

AIR

FLOW

Certified

dimension

drawings

are

available

on

request

Fig.

1

—

Dimensions

©Carrier

Corporation

1972

Form

38AD-6SI

f^GOJ^G

Lift

unit

at

points

G,H,

J,

and

K

(Fig.

2).

Use

eyebolts

and

washers

supplied

in

parts

package.

Do

not

sling

unskidded

unit

Skidded

unit

may

be

slung,

provided

sling

does

not

contact

unit

sides.

Do

not

roll

unskidded

unit

on

pipes

or

wooden

pilings.

Fig.

2

—

Weight

Distribution

and

Lifting

Points

Table

2

-

Weight

Distribution

UNIT

WEIGHT

(lb)

Total

Leg

Location

A

B

C

D

E

F

38AD024

1750

175

175

575

575

125

125

38AD028

1900

178

178

521

565

207

251

38AD034

2300

263

263

767

767

120

120

38AD044

3200

,

359

359

770

810

441

461

38AB054

3145

j

180

605

607

181

-

-

38AB064

3830

245

712

714

244

-

-

38AB084

4960

327

913

913

327

-

-

SKID

REMOVAL

Remove

the

four

bolts

(each

section)

holding

top

frame

in

place

and

lift

frame

from

unit

(38AD024

thru

044

and

38AB054,064

units).

Compressor

(with

coil)

Section

—

Raise

and

block

up

one

side

of

unit

8

inches.

Remove

the

three

exposed

hold-down

bolts

from

base

skid.

Lower

unit

and

repeat

on

opposite

side.

Coil

(only)

Section

(38AB054.064

and

084)

-

Raise

and

block

up

one

end

of

unit

8

inches.

Remove

the

two

exposed

hold-down

bolts

from

base

skid.

Lower

unit

and

repeat

on

opposite

end.

ERECTING

AND

INTEGRATING

ONE

UNIT

Position

Units

38AD028,044

and

38AB054,

064,084

so

air

flow

is

unrestricted

on

all

sides

and

on

top

(Fig.

1).

38AD024,034:

any

side

except

compressor

end

may

be

installed

against

a

wall

if

high

leg

setting

is

used

and

other

three

sides

are

unrestricted.

Place

38AB

and

38AD

units

on

high

leg

setting

if

accessory

damper

is

used.

Erect

Uniteuswrgklegs

and

gussets

attached

to

unit

base

skid(s)

or

frame.

Adjust

all

corner

legs

to

desired

height

before

attaching

to

unit.

38AD024,028,034

AND

044

UNITS

-

Block

up

or

suspend

unit.

With

field-supplied

bolts,

bolt

corner

leg

and

angle

gusset

to

each

corner

of

unit.

Bolt

two

center

legs

to

bottom

of

unit

where

compressor

and

coil

sections

meet.

Lower

unit.

38AB054,064

AND

084

UNIT

-

Block

up

or

suspend

compressor

(with

coil)

section.

Bolt

corner

leg

and

angle

gusset

to

each

corner

at

coil

end.

Bolt

two

center

legs

to

compressor

end.

Allow

one

set

of

holes

to

project

out

past

compressor

section.

Bolt

two

center

legs

to

bottom

of

unit

where

compressor

and

coil

sections

meet.

Lower

unit.

Block

up

or

suspend

coil

(only)

section.

Bolt

two

corner

legs

and

angle

gussets

to

coil

return

bend

end.

Butt

coil

(only)

section

against

com¬

pressor

compartment,

allowing

coil

to

rest

on

leg

projections.

Remove

top

cover

on

compressor

compartment

and

bolt

sections

together

at

legs

and

sides.

Table

3

—

Legs

and

Gussets

Provided

QUANTITY

38AB

38AD

Corner

Leg

Center

Leg

Angle

Gusset

Parts

Pkg*

-

024,028

034

4

2

4

1

-

044_

4

2

-

1

054,064

-

-

4

__

1

084

-

4

-

4

1

*Parts

packages

in

units

contain

al!

mounting

fasteners

required

for

attaching

legs

and

gussets

38AD

|

38AD

38AD

38AD

38AB

-1

38AB

38AB

UNIT

024

|

028

034

044

054

064

084

A(in.)

16

16

18

1

-*

16

18

.

20

B(in.)

24

:

24

26

j

20

24

26

;

28

*Only

044

units

use

one-piece

legs

Fig.

3

—

Legs

and

Gussets

2

Compressor

Mounting

38AD024,028,034

UNITS

-

As

shipped,

com¬

pressor

is

held

down

by

special

self-locking

bolts

and

plain

lockwashers.

After

unit

is

installed,

remove

the

self-locking

bolts

one

at

a

time

and

reassemble

with

flanged

washers

and

neoprene

snubbers

as

shown

in

Fig.

4.

Special

flanged

wash¬

ers

and

neoprene

snubbers

are

shipped

in

a

cloth

bag

tied

to

one

of

the

compressor

feet.

Tighten

all

four

bolts.

Then,

loosen

each

until

the

flanged

washer

can

be

moved

sidewise.

38AD044,

38AB054,064

AND

084

UNITS

(com¬

pressors

are

mounted

on

a

common

support

channel)

—

Remove

the

four

shipping

bolts

from

mounting

channels

prior

to

start-up.

Fig.

4

—

Compressor

Mounting

(38AD024,028

and

034)

Fan

Thermostat

—

Route

the

thermostat

control

bulb

and

capillary

(located

in

compressor

section)

thru

grommeted

hole

in

compressor

section

base

pan.

Do

not

kink

capillary.

Position

bulb

in

inlet

ah

stream

and

secure

to

inlet

ah

flange

adjacent

to

compressor

section.

Use

clamp

and

screw

provided

in

parts

package.

If

accessory

head

pressure

control

damper

section

is

used,

secure

bulb

to

air

inlet

side

of

damper.

Use

hole

in

damper

frame.

Integrate

Unit

(38AB054.064

and

084

only)

—

Connect

refrigerant

piping

between

the

two

sec¬

tions,

using

materials

furnished

with

unit.

Arrange

discharge

and

liquid

lines

as

shown

in

Fig.

5

and

braze

as

indicated.

Electrically

connect

unit

control

box

and

junc¬

tion

box

on

coil

(only)

section

by

using

flexible

fan

conduit

furnished

in

the

unit.

Use

the

mating,

quick-connect,

polarized

plugs

furnished

in

the

two

sections

to

make

the

wire

connections.

Motormaster®

(32

Series)

Head

Pressure

Controller

—

Refer

to

MOTORMASTER

Instructions

shipped

with

this

accessory,

plus

the

following

information.

Control

box

and

sensor

location

is

shown

in

Fig.

6.

Electrical

connections

are

shown

in

Fig.

7.

Refer

to

unit

label

diagram

as

requhed.

On

200-,

208-

and

230-volt

units,

outdoor

fan

motor

no.

1

(OFMj),

located

nearest

the

compressor,

may

be

used

with

MOTORMASTER

without

modification.

For

460-

and

575-volt

units,

refer

to

Table

4

for

field-supplied

components

needed

with

MOTORMASTER.

Fig.

6

-

MOTORMASTER

Control

Box

and

Sensor

Location

3

FROM

FAN

CONTACTOR

200,

208,

230

OR

460

VOLTS

200,

208-,

AND

230-VOLT

UNITS

.^ffV

vBRN

a

BRN.

MOTOR

SUITABLE

FOR

USE

WITH

32LT

'MOTORMASTER

SPEED

CONTROLLER*

200-,

230“V

RATED

CONTROLLER

*Use

230-volt

controller

with

200-,208-

or

230-volt

motors

Fig.

7

—

Motormaster®

Electrical

Connections

Table

4

—

Components

Required

for

MOTORMASTER

Use

UNIT

MODEL

RUN

CAPACITOR

TRANS¬

FORMER

MOTOR

38AD024

600

100

HC96LH020

HT01AH951

HT01AH959

HC46VL220

or

HC46VL221

38AD028

38AD034

38AD044

38AB054

38AB064

38AB084

600

HC96LH030

HT01AH952

HC52TE230

100

HT01AH954

REFRIGERANT

PIPING

Refrigerant

Line

Sizes

will

depend

on

length

of

piping

required

between

condensing

unit

and

evap¬

orator.

Consideration

must

be

given

to

liquid

lift

and

to

compressor

oil

return.

Refer

to

Part

3

of

Carrier

System

Design

Manual

for

line

sizing

information

and

Fig.

8

for

recommended

piping

details.

Single

Pumpout

Control

—

All

units

are

factory

wired

to

operate

on

single

pumpout

control

and

require

a

field-supplied

liquid

line

solenoid

valve,

sized

for

minimum

pressure

drop,

to

be

installed

immediately

ahead

of

each

expansion

valve.

If

unit

is

to

be

used

with

a

chiller,

wiring

modifications

may

be

necessary.

Refer

to

38AB

Application

Data,

Chilled

Water

Applications.

Refrigerant

Drier

and

Moisture

Indicator

—

A

filter-drier(s)

and

a

liquid-moisture

indicator

are

shipped

with

unit

for

field

installation.

Refer

to

Fig.

9

for

typical

recommended

piping

arrange¬

ments

and

to

Table

5

for

physical

data

on

driers.

Receiver

—

No

receiver

is

provided

with

unit.

It

is

recommended

that

one

not

be

used.

Piping

Procedure

—

Do

not

remove

plastic

dust

plugs

from

suction

and

liquid

line

stubs

in

com¬

pressor

compartment

until

piping

connections

are

ready

to

be

made.

Pass

nitrogen

or

other

inert

gas

thru

piping

while

brazing,

to

prevent

formation

of

copper

oxide.

NOTES

2

D

as

used

in

8D

etc,

indicates

the

pipe

diameter

size

as

a

measure

of

length

1

Lower

split

first

on,

last

off

3

TXVE

indicates

Thermostatic

Expansion

Valve

Equalizer

Connection

Fig.

8

—

Typical

Piping

Connections

for

Face

Split

Coils

77

7

4

Fig.

9

—

Recommended

Filter-Drier(s)

and

Sight

Glass

Locations

Table

5

—

Filter-Drier

Replacement

Parts

and

Data

UNIT

FILTER-DRIER

Part

No.

Qty

Conn.

Size

;

Replacement

Part

No.

Core

Qty

38AD024

KH43LE1

23

1

%

:

Same

0

38AD028

|

KH43LE121

2

s

/»

Same

0

38AD034

j

KH43LE

121

2

%

Same

0

38AD044

j

KH49EA030

1

X

KH29EZ050*

2

38AB054

!

KH49EA120

1

l

1

/*

KH29EZ050*

2

38AB064

|

KH49EA120

1

i

l

/

8

KH29EZ050*

2

38AB084

KH49EA040

1

iv»

KH29EZ050*

3

*

Replaceable

cores

only

Install

field-supplied

thermostatic

expansion

valve

in

liquid

line

ahead

of

each

evaporator

section.

For

two-step

cooling,

the

solenoids

used

must

be

wired

to

be

opened

by

control

from

a

two-step

thermostat

For

example:

two

solenoids

may

be

used

with

three

TXV’s

—

one

of

the

solenoids

serving

a

liquid

line

feeding

two

of

the

TXV’s.

When

three

solenoids

are

used

with

three

TXV’s,

two

of

the

solenoids

must

be

tied

in

parallel

with

the

thermo¬

stat

to

serve

the

one

liquid

line

feeding

the

two

TXV’s.

The

third

solenoid

operates

independently

for

the

other

step

of

cooling.

Suction

Piping

at

Evaporator

and

TXV

Bulb

Location

The

purpose

of

these

recommendations

is

to

achieve

good

mixing

of

the

refrigerant

leaving

the

evaporator

suction

header

for

proper

sensing

by

the

TXV

bulb.

1.

A

minimum

of

two

90°

elbows

must

be

installed

upstream

of

the

expansion

valve

bulb

location.

2.

The

thermal

bulb

must

be

strapped

to

a

vertical

riser

following

the

second

elbow

of

item

1.

This

riser

must

be

at

least

15

pipe

diameters

high

and

the

bulb

should

be

fastened

10

pipe

diameters

above

the

preceding

elbow.

3.

S

i

ze

the

suction

line

from

near

evaporator

thru

the

15

diameter

long

riser

for

high

velocity.

Enter

the

suction

pipe

sizing

charts

in

Carrier

System

Design

Manual

at

corrected

design

tons

(each

evaporator

split)

and

80

feet

equivalent

length

(for

2°

loss).

Choose

the

smaller

size

pipe,

when

reading

falls

between

two

sizes

on

chart.

Since

the

selection

of

suction

piping

recommended

for

high

velocity

is

approxi¬

mately

20

ft

equivalent

length,

this

sizing

method

will

result

in

about

0.5°

friction

loss

for

that

section.

If

a

2°

loss

is

allowed

for

the

entire

suction

line,

this

leaves

1.5°

tor

the

balance

of

suction

line

and

should

be

sized

on

that

basis.

This

high-velocity

sizing

should

be

adequate

for

oil

return

up

the

15

diameter

long

riser.

It

should

be

checked.

If

an

oil

return

connection

at

the

bottom

of

the

suction

header

is

supplied

with

an

evaporator,

this

connection

must

be

teed

in

ahead

of

first

mixing

elbow

(Fig.

8).

When

the

compressor

is

below

the

evaporator,

the

riser

at

the

evaporator

does

not

have

to

extend

as

high

as

the

top

level.

After

the

15

diameter

riser

has

been

provided,

the

suction

may

elbow

down

immediately.

Safety

Relief

—

A

fusible

plug

is

located

on

unit

liquid

line

before

liquid

valve.

WIRING

AND

ELECTRICAL

DATA

Power

Supply

—

Electrical

characteristics

of

avail¬

able

power

supply

must

agree

with

unit

nameplate

rating.

Supply

voltage

must

be

within

tolerances

shown

in

Table

6.

Phase

unbalance

must

not

exceed

2%.

Operation

of

unit

on

improper

supply

voltage

or

with

excessive

phase

unbalance

con¬

stitutes

abuse

and

is

not

covered

by

Carrier

Warranty.

Power

Wiring

—

All

power

wiring

must

comply

with

applicable

local

and

national

codes.

Install

a

field-supplied

branch

circuit

disconnect

switch

of

a

type

that

can

be

locked

“Off’

or

“Open.”

Run

power

wires

from

the

disconnect

switch

thru

the

power

opening

(H

on

Fig.

1)

on

unit

and

connect

to

terminal

block

just

inside

the

opening.

On

38AB084,

there

are

two

terminal

blocks

(on

208-volt

and

230-volt

units

only).

Each

is

limited

to

350

MCM

maximum

wire

size

(see

Table

7).

These

units

are

provided

with

two

power

openings

to

accommodate

two

conduit

runs.

For

access

to

power

opening

and

terminal

blocks

on

38AD044,

unlatch

the

two

latches

on

the

outer

hinged

door

and

swing

open

outer

door.

Remove

screws

on

barrier

panel

and

remove

barrier

to

expose

wiring.

5

Table

6

—

Electrical

Data

(3-Phase,

60-Hz)

COMPRESSOR

FAN

FLA

el

Nameplate

Voltage

Suppl

ied*

Voltage

MWA

ICF

400

200

180-229

122

333

500

230

207-264

103

314

600

460

414-528

50

156

100

575

518-660

41

125

410

200

180-229

175

455

510

230

207-264

154

428

610

460

414-528

77

.;

214

110

575

518-660

62

172

400

200

180-229

175

477

500

230

207-264

158

458

600

460

414-528

81

229

100

575

518-660

63

183

400

200

180-229

213

424

500

230

207-264

181

390

600

460

414-528

90

195

100

575

518-660

73

158

410

208

187-229

1

271

547

510

230

198-254

263

508

610

460

414-506

131

253

no

575

518-632

108

204

410

208

187-229

306

624

510

230

198-254

303

577

610

460

414-506

152

288

no

575

518-632

125

232

410

208

187-229

246/206t

842

510

230

198-254

226/190t

780

610

460

414-506

189

390

no

575

518-632

152

312

3

85

8

71.5

37.5

28.6

123

O'”

108

6

54

4

43.6

123

0

1114

57

2

_

45

-

°

No^l_

N

o

.

~85~8

85

71

5

71

37

5

37

28.6

28

No.

1

"320

300

0

0

FUSE

RA

No.

1

No.

2,3

AMPS

1

320

4

5

'1

4

5

150

1

300

4

5

;

4.5

125

i50

1

9

1

9

60

1.20

1.6

1.6

50

1

436

6

2

6

6

200

1

410

6.2

6

0

|

175

1

205

3.0

3

0

90

i;64

2.4

2.4

70

I

458

6

2

6

6

200

I

440

6

2

6

0

200

1

220

3.0

3.0

90

176

2.4

2.4

80

1

No.

2

32Cf

6

2

6

6

250

300

6

2

i

6.0

250

f

:::

T

5

0

3

0

!

3

0

110

I

120

2.4

d

2.4

100

No.

1,4

6.2

6

2

3

0

2.4

6

2

6

2

3

0

2.

4

6

2

6

2

3

0

2

4

No.

2,3,5,6

6

6

6

0

3

0

2.4

6

6

6

0

3

0

2.4

6

6

6

0

3

0

2

4

Shaded

values

are

LRA

drawn

by

first

winding

of

->

part-winding

start

units

(not

standard

on

38AB054,064,

but

may

be

field

modified)

See

Note

1

Larger

value

is

total

LRA.

FLA

-

Full

Load

Amps

ICF

—

Maximum

Instantaneous

Current

Flow

(sum

of

LRA

of

last

compressor

to

start

and

FLA

of

all

other

motors

in

unit,

and

control

circuit

current)

LRA

—

Locked

Rotor

Amps

MWA

—

Minimum

Wire

Amps

per

NEC,

Section

430-24

Values

based

on

maximum

of

1%

voltage

drop

in

line.

*Units

are

suitable

for

use

on

electrical

systems

where

voltage

supplied

to

the

unit

terminals

is

never

below

or

above

the

listed

limits

tUnits

38AB084

(208

,

230-volt

only)

have

two

power

connections

Maximum

wire

size

is

350

MCM

each

NOTES

1

Dual

compressor

units

have

a

4-

to

12-second

delay

between

first-

and

second-compressor

start-up

Units

are

supplied

with

either

across-the-line

or

part-winding

start,

depending

on

unit

size

and

voltage

Refer

to

Electrical

Data

table

Where

two

LRA

values

are

shown,

units

are

part-winding

start,

(all

others

are

across-the-line)

2

Units

have

factory-installed

circuit

breakers

and/or

pullout

fuses

that

meet

NEC

requirements

for

branch

circuit

over-current

protection

and

in-sight

disconnect

Consult

local

codes

3

Maximum

Incremental

Current

Inrush

during

start-up

is

LRA

drawn

by

first

winding

of

part-winding

start

unit

(shaded

area)

or

across-thedine

LRA

of

largest

compressor

when

part-winding

start

is

not

available

4

Fans

no

1

and

4

have

single-phase

speed

control

motors

on

208-

and

230-volt

units

5

Units

38AB054

and

064

which

have

two

contactors,

can

be

converted

to

part-winding

start

by

addition

of

two

time-delay

relays

(Carrier

part

no

HN67SK001

for

208-

and

230-volt

units,

or

no

HN67SK002

for

460-

and

575-volt

units)

Two

additional

contactors

are

also

required

with

460-

and

575-volt

units

to

be

wired

same

as

other

part-wind

compressors

On

38AD024

thru

034

units,

power

terminal

block

is

in

the

control

box.

Remove

the

outer

panel

and

remove

the

no.

10

screw

on

the

door.

Swing

open

door,

remove

screws

on

barrier

panel

and

remove

barrier

panel.

On

38AB054,064

and

084

units,

remove

two

screws

holding

hinged

sheet

metal

barrier

and

swing

open

barrier.

Condenser

fans

must

rotate

clockwise

when

viewed

from

above.

If

necessary,

correct

direction

of

fan

rotation

by

interchanging

any

two

power

input

wires

at

disconnect

switch.

Affix

crankcase

heater

decal

to

unit

disconnect

switch.

Control

Circuit

Wiring

—

Internal

control

voltage

on

38AD

units

is

115

volts.

Internal

control

voltage

on

208-

and

230-volt

38AB

units

is

the

same

as

unit

voltage.

On

460-

and

575-volt

38AB

units,

it

is

115

volts.

All

control

circuit

wiring

must

comply

with

applicable

local

and

national

codes.

Remote

control

wiring

must

enter

unit

control

box

thru

control

opening

(G

on

Fig.

1)

and

connect

to

terminal

block

inside

the

control

box.

772

6

Table

7

—

Maximum

Field

Wire

Sizes

UNIT

SIZE

VOLTS

(60-Hz)

WIRE

SIZE

CONN.

38AD

024,028/034

208

230

6

AWG

to

350

MCM

TB

460

575

14

AWG

to

2/0

044

460

575

208

230

6

AWG

to

350

MCM

I

TB

CT

38AB

054,064

208

230

6

AWG

to

350

MCM

CT

460

575

6

AWG

to

3/0

084

All

6

AWG

to

350

MCM

CT

CT

-

Compression

Terminal

(attached

to

terminal

block)

TB

—

Terminal

Block

(with

integral

compression

terminal)

TB

DT---

0

---

0

--

-

0

---

0

0

-

-T

I

-I

-

I

_-4

TC|

TC;2*^0-

'i

s,

fea-

--

L

-

2

%X3

TWO

STEP

COOLING

38AB054,

064

AND

084

_I

LEGEND

CR

—

Control

Relay

TC

—

Thermostat,

Cooling

LLS

—

Liquid

Line

Solenoid

-Field

Wiring

TB

—

Terminal

Board

(at

unit)

*Field

Supplied

Fig.

10

—

Control

Circuit

Wiring

with

Line

Voltage

(115,

208-

or

230-volt)

Thermostat

LINE

VOLTAGE

REMOTE

CONTROL

-

Install

field-supplied

line

voltage

thermostat(s)

as

shown

in

Fig.

10

for

two-step

cooling.

Wire

liquid

line

solenoid

as

shown.

LOW-VOLTAGE

REMOTE

CONTROL

-

Install

field-supplied

accessories

as

shown

in

Fig.

11

or

Fig.

12

for

either

two-step

cooling

or

two-step

cooling,

one-step

heating.

Wire

liquid

line

solenoids

as

shown.

START-UP

Preliminary

Checks

->

1.

Compressor

oil

level

must

be

visible

at

sight

glass

in

each

compressor

crankcase.

Add

oil

if

necessary.

2.

Each

compressor

must

float

freely

on

its

mounting

springs.

3.

All

internal

wiring

connections

must

be

tight,

and

all

barriers

and

covers

must

be

in

place.

->

Toggle

switches

for

units

38AB054,064

and

084

must

be

in

“On”

position.

4.

Electrical

power

source

must

agree

with

unit

nameplate

rating.

5.

All

service

valves

must

be

open.

6.

Fan

cycling

thermostat

sensing

bulb

must

be

in

air

stream

under

fan

no.

1.

7.

Crankcase

heater

must

be

firmly

locked

into

the

compressor

crankcase.

Leak

Test

the

entire

refrigerant

system

by

the

Pressure

Method

described

in

the

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Section

1-6.

Use

R-22

at

approximately

25

psig

backed

up

with

an

inert

gas

to

a

total

pressure

not

to

exceed

245

psig.

Evacuate

and

Dehydrate

the

entire

refrigerant

system

by

either

of

the

methods

described

in

the

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Section

1-7.

Li

38A

B

,

0

5

4,0

6

4,

084,

SDRl

>-2l

(IMS)

-

SR|

—'

p-6

i(0-OH-

l

ONE

“

STEP

HEATING

CONTROLS

THERMOSTAT

HH07AT072

SUBBASE

HH93AZ080

LEGEND

AHA

—

Adjustable

Heat

Anticipator

CC

—

Cooling

Compensator

CR

—

Control

Relay

HD

—

Heating

Device

IFR

—

Indoor

Fan

Relay

IMS

—

Indoor

Motor

Starter

LLS

—

Liquid

Line

Solenoid

R

—

Relay

(Accessory)

SDR

-

Solenoid

Dropping

Relay

SR

—

Solenoid

Relay

TB

—

Terminal

Board

TC

—

Thermostat,

Cooling

TH

—

Thermostat,

Heating

-

Factory

Wired

-Field

Wired

|

|

Terminal

Board

Conn.

at

Unit

^Field

Supplied

Fig.

11

-

Control

Circuit

Wiring

with

24-Volt

Accessories

(38AB

Units

Only)

7

772

CONTROL

POWER

AT

38AD

UNIT

CR

—

Control

Relay

HD

—

Heating

Device

IFC

—

Indoor

Fan

Contactor

IFR

—

Indoor

Fan

Relay

LLS

—

Liquid

Line

Solenoid

R

—

Heating

Relay

(field-supplied

24-volt

sealed

coil,

10VA

maximum

rating)

SDR

—

Solenoid

Dropping

Relay

TB

—

Terminal

Board

TC

—

Thermostat,

Cooling

TH

—

Thermostat,

Heating

-—

Factory

Wiring

_Field

Wiring

^Jumper

removed

only

when

separate

24-volt

power

sources

are

available

for

heating

and

cooling

fTo

control

heating

device

and

provide

automatic

indoor

fan

operation

on

heating

->

Fig.

12

—

Control

Circuit

Wiring

with

24-Volt

Accessories

(38AD

units

only)

Preliminary

Charge

—

Refer

to

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Section

1-8,

for

charging

methods

and

procedures

mentioned

below.

Charge

system

with

approximately

25

lb

of

R-22

(75

lb

for

38AD044,

38AB054,064

and

084

units)

by

the

Liquid

Charging

Method

and

Charging

by

Weight

Procedure.

Energize

the

Branch

Circuit,

set

space

thermostat

above

ambient.

Close

field

disconnect

switch

and

turn

on

unit

circuit

breakers.

Be

sure

compressor

crankcase

heater(s)

is

operating.

Allow

crankcase

heater(s)

to

operate

a

minimum

of

24

hours

before

starting

unit.

To

Start

Unit,

set

space

thermostat

below

ambient,

to

ensure

circuit

operation.

On

38AD044

and

38AB084,

push

control

circuit

reset

button(s).

After

starting

unit,

there

will

be

a

delay

of

about

'15

seconds

(12

seconds

on

38AD044

and

38AB084)

before

first

compressor

starts.

Charging

System

1.

Block

condenser

coils

to

maintain

125

F

con¬

densing

temp

at

280

psig,

then

add

additional

charge

to

clear

sight

glass.

(If

long

liquid

lines

or

vertical

lifts

greater

than

25

ft

are

used,

a

liquid

line

sight

glass

should

be

installed

at

condensing

unit

and

used

for

charging

purposes.)

2.

After

sight

glass

has

cleared,

additional

charge

must

be

added

per

Table

8,

to

flood

subcooler

circuits

in

condensers.

After

Charging

the

System,

allow

unit

to

run

for

about

20

minutes.

Stop

unit

and

check

compressor

oil

level.

Add

oil

only

if

necessary

to

bring

oil

into

view

in

sight

glass.

If

oil

is

added,

run

unit

for

additional

10

minutes.

Stop

unit

and

check

oil

level.

If

level

is

again

low,

add

oil

only

after

determining

that

piping

system

is

designed

for

proper

oil

return

and

that

the

system

is

not

leaking

oil.

Check

the

operation

of

all

safety

controls.

Replace

all

service

panels.

Be

sure

that

control

panel

door

is

closed

tightly.

Table

8

—

Charging

Data

(R-22)

UNIT

REFRIG

CHG

(lb)

REFRIG

STORAGE

CAP.

(lb)

f

Sub-cooler

Coil*

38AD024

8

70

38AD028

8

77

38AD034

7

99

3

8

AD

044

15

161

38AB054

12

154

38AB064

10

198

38AB084

21

322

*For

maximum

system

capacity

without

receiver

f

At

120

F

condensing

temp

with

condenser

80%

full

of

liquid

NOTE

Values

shown

do

not

include

charging

requirements

for

cooling

coils

and

piping

SERVICE

Capacity

Control

is

by

either

one

or

two

suction

pressure

actuated

unloaders.

Each

controls

two

cylinders.

Unloaders

are

factory

set

(see

Table

9)

but

may

be

field

adjusted.

No.

1

unloader

is

on

cylinder

bank

on

same

side

of

compressor

as

terminal

box.

CONTROL

SET

POINT

(cylinder

load

point)

is

adjustable

from

0

to

85

psig.

To

adjust,

turn

control

set

point

adjustment

nut

(Fig.

13)

clock¬

wise

to

its

bottom

stop.

In

this

position,

set

point

is

85

psig.

Then,

turn

adjustment

counterclockwise

to

desired

control

set

point.

Every

full

turn

counterclockwise

decreases

set

point

by

7.5

psig.

PRESSURE

DIFFERENTIAL

(difference

between

cylinder

load

and

unload

points)

is

adjustable

from

6

to

22

psig.

To

adjust,

turn

pressure

differential

adjustment

screw

(Fig.

13)

counterclockwise

to

its

back

stop

position.

In

this

position,

differential

is

6

psig.

Then,

turn

adjustment

clockwise

to

desired

pressure

differential.

Every

full

turn

clockwise

increases

differential

by

1.5

psig.

772

8

Table

9

—

Physical

Data

UNIT

38AD024

38AD028

!

38AD034

38AD044

38AB054

f

38AB064

38AB084

OPER

WT

(lb)

1750

1900

2300

'

3200

3145

3830

4960

REFRIGERANT

R-22

Oper

Chg

(lb)*

28

0

|

1

30

5

j

|

35

5

j

;

66

0

1

57

0

|

|

71

0

J

132

0

COMPRESSOR

Reciprocating

Hermetic

—

1750

rpm

Number

1

1

1

1

2

!

I

2

]

2

1

2

Model

06ED250

06EE266

06EE275

:

06EA

250

06ED

250

06EA

250

06EE.

275

06EA

275

1

06

EE

275

06EA

,

299

06EE

299

Cylinders

4

4

6

4

4

4

6

6

6

6

6

Oil

(pt)

14

14

19

14

14

14

19

19

19

19

19

Crankcase

Htr

125

Watts

Protection

Solid

State

&

Ckt

Bkr

Thermotector

&

Ckt

Bkr

Solid

State

&

Ckt

Bkr

Cap.

Control

Suction

Pressure

Cylinder

(Jnloader(s

)

No.

1

Unloader

Settings

(ps

ig)

Load

76

78

d

78

88

-

79

-

79

-

79

Unload

58

60

•;!

60

66

-

66

-

66

-

66

No.

2

Unloader

Settings

(psig)

Load

-

76

76

-

\

76

-

76

-

76

Unload

-

58

58

-

i

„_i

58

-

58

-

58

COND

FANS

Axic

il

Flow;

Direct

Drive

Number

3

3

$

3

3

6

i

«

S

1

6

Rpm

1140

1140

iiij

1140

1140

1140

1140

1140

Diam

(in.)

26

30

30

30

30

30

30

Motor

Hp

(ea)

%

1

1

1

1

1

1

Cfm

18,200

25,200

28,200

;

i

:

'

i

■

31,000

50,400

j

56,400

S

62,000

COND

COIL

Plate

Fins;

3-rowt

Sections

1

1

1

l

>

l

2

i

!

:

2

1

2

Face

(sq

ft)

35

4

39

0

49

6

60

4

78

0

|

99

2

120

8

Capacity

(l

b

)

$

70

77

99

161

154

198

322

ELEC

CONTROLS

Time

Guard

Circuit**

Pressurestat

Du

al

...

.

Cutout

High

r

Cut-in

375

Psig

275

Psig

.

Cutout

Low

Cut-in

29

Psig

29

Psig

29

Psig

44

Psig

45

Psig

63

Psig

Pressurestat

Capacity

Control

Cutout

-

_

57

Psig

57

Psig

Cut-in

-

-

87

Psig

87

Psig

Pressurestat

Oi

1

Pressure

Con

fro

1

Cutout

5

Psi

Above

Suction

Pressure

Thermostat

Fan

Cycling

No.

1

Opens,

70

F;

Closes,

75

F

No.

2

Opens,

57

F;

Closes,

62

F

Thermostat

Opens

Discharge

Line

,

290

F;

Closes,

210

F

PRESS.

RELIEF

F

u

s

i

b

L

e

Plug

DISCHARGE

LINE

1

]

1

2

2

2

2

CHECK

VALVE

I

*

Approximate

charge

for

maximum

system

capacity

Holding

charge

factory

supplied

with

all

units

f

Unit

38AD044

and

38AB084

have

4-row

coi)

Time

Guard

Circuits

BASIC

FUNCTIONS

OF

TIME

GUARD

CIRCUIT

on

all

units

provide

for

normal

(12

to

15

sec)

momentary

delays

after

the

thermostat

closes

and

before

compressors)

start.

The

circuit

also

pro¬

vides

for

a

longer

delay

(4

min

45

sec

to

5

min

30

sec)

in

the

event

of

thermostat

short

cycling

or

momentary

power

failure.

^Storage

capacity

at

120

F

condensing

temp

with

condenser

80%

full

of

liquid

**Short-cycJe

protection

38AD024

THRU

044

UNITS

In

addition

to

the

basic

functions,

timers

in

these

units

provide

additional

delays

for

oil

pressure

switch

bypass

(40

sec),

winter

start

provision

(150

sec)

bypass

of

low-pressure

switch

and

part-winding

start

(1

sec),

if

used.

9

772

38AB084

UNIT

Timers

in

this

unit

provide

basic

function,

plus

40

sec

bypass

for

oil

failure

switch

and

1

sec

delay

to

accomplish

part-winding

start.

For

specific

sequence

for

each

unit,

refer

to

Timing

Charts

in

Fig.

14.

PRESSURE

DIFFERENTIAL

ADJUSTMENT

SCREW

BYPASS

PISTON

CONTROL

SET

POINT

ADJUSTMENT

NUT

VALVE

BODY

DIFFERENTIAL

SCREW'

SEALING

CAP

(CAP

MUST

BE

REPLACED

TO

PREVENT

REFRIGERANT

LEAKAGE)

Fig.

13

—

Capacity

Control

Valve

o

38AB054

THRU

064

UNITS

H--40SEC

'-5

NOTE

BLACK

INDICATES

CLOSED

CONTACTS

38AB084

UNITS

Fig.

14

—

Timing

Charts

Control

Circuit

Reset

38AD024

THRU

044

AND

38AB084

-

Control

circuit

locks

out

on

these

units

in

the

event

of

oil

pressure

loss,

excessive

motor

temperatures,

or

excessive

discharge

temperatures

Reset

is

accomplished

by

pushing

reset

button(s)

in

unit

control

box.

38AB054

AND

064

-

Loss

of

oil

pressure

or

excessive

motor

temperatures

cause

control

circuit

lock

out

on

these

units

Reset

is

accomplished

by

pushing

reset

button

on

oil

failure

safety

switch(es).

All

other

safety

controls

on

each

unit

are

automatic

reset,

with

restart

accomplished

through

unit

timers.

Oil

Pressure

Safety

Control

(OPS)

for

each

com¬

pressor

will

stop

unit

if

oil

pressure

differential

is

not

established

or

maintained

at

either

compressor.

If

OPS

stops

unit,

determine

and

correct

the

cause

(such

as

loss

of

compressor

oil

or

flooded

compressor)

before

restarting

unit.

Failure

to

do

so

will

constitute

abuse.

Equipment

failure

due

to

abuse

is

not

covered

by

the

Warranty

To

restart

unit,

push

manual

reset

button

in

unit

control

box

(except

38AB054

and

064

units).

Reset

button

is

on

OPS

on

38AB054

and

064.

Compressor

Motor

Protection

on

38AD024

thru

044

and

38AB084

consists

of

three

temperature

sensors

(one

for

each

phase)

embedded

in

the

motor

windings,

and

solid

state

modules

in

unit

control

box.

Sensors

are

part

of

a

temperature

bridge.

If

a

motor

winding

overheats,

the

bridge

circuit

will

unbalance

and

a

silicone-controlled

rectifier

in

the

module

will

de-energize

a

relay

which

opens

a

set

of

normally

open

contacts

in

the

module

and

stops

the

compressor.

If

one

sensor

fails,

it

can

be

jumped

with

a

75-ohm,

2-watt

resistor.

When

checking

or

testing

module,

do

not

apply

more

than

6

volts

across

sensor

terminals.

Many

test

instruments

exceed

this

voltage

rating;

check

before

using.

If

a

component

in

a

module

fails

on

38AD024

thru

044,

the

entire

module

must

be

replaced.

On

38AB084,

the

transformer

is

external

to

the

module

and

may

be

replaced

separately.

Replace

transformer

with

a

Carrier

specified

balanced

transformer.

To

restart

compressor

after

shutdown

due

to

motor

protection

trip,

push

control

circuit

reset

button

in

unit

control

box.

Safety

Relief

-

All

38AB,AD

units

are

protected

against

excessive

pressure

by

a

fusible

plug

inserted

in

the

liquid

line.

->

Winter

Start

Control

—

On

38AB

units

(not

necessary

on

38AD

units

because

the

timer

supplies

this

function),

install

a

liquid

line

pressure-

stat

(Carrier

part

no.

HK02AB026)

and

evaporator

freeze-up

protector

(defrost

thermostat.

Carrier

part

no.

HH22UA025).

38AD

control

circuits

incorporate

a

150

sec¬

onds

timed

bypass

of

the

low-pressure

switch

to

in