Carrier 3BAU024 Dimensions and installation guide

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2

Table of contents

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HEATING

&

COOLING

3BAU024,028,034

Heat

Pump

—

Outdoor

Units

Installation,

Start-Up

and

Service

Instructions

SAFETY

CONSIDERATIONS

Installing,

starting-up

and

servicing

this

equipment

can

be

hazardous

due

to

system

pressures,

electrical

com¬

ponents

and

location

of

equipment

(roofs,

elevated

structures,

etc.).

Only

trained,

qualified

installers

and

service

mechanics

should

install,

start-up

and

service

this

equipment.

Untrained

personnel

can

perform

basic

maintenance

functions,

such

as

cleaning

coils,

filters

and

replacing

filters.

All

other

operations

should

be

performed

by

trained

service

personnel.

When

working

on

equipment,

observe

precautions

in

the

literature

and

on

tags,

stickers

and

labels

attached

to

the

equipment.

•

Follow

all

safety

codes

•

Wear

safety

glasses

and

work

gloves

Keep

quenching

cloth

and

fire

extinguisher

nearby.

•

Use

care

in

handling,

rigging

and

setting

bulky

equipment.

A

WARNING

To

avoid

electric

shock

and

personal

injury,

be

sure

power

to

equipment

is

shut

off

before

performing

maintenance

or

service.

INSTALLATION

IMPORTANT:

Follow

unit

location,

clearances

and

piping

requirements

in

this

booklet

carefully

to

enhance

system

efficiency,

and

to

avoid

system

failure

Read

entire

booklet

before

starting

installation.

Step

1

—

Complete

Pre-Installation

Checks

INSPECT

SHIPMENT

—

Immediately

file

claim

with

shipping

company

if

shipment

is

damaged

or

incomplete.

CONSIDER

SYSTEM

REQUIREMENTS

•

Consult

local

building

codes

and

National

Electrical

Code

(NEC)

for

special

installation

requirements.

HINGED

ACCESS

DOOR-

CONTROL

BOX

REMOVABLE

TOP

COVER

(028

ONLY)

REQUIRED

OVERHEAD

AIR

SPACE

sB'-o"

2’“4^

(024,028)

3-if"

(034)

4

-O

(BOTH

SIDES)

AIRFLOW

THRU

CONDENSER

fm\

SPACE

FOR

SERVICE

AND

AIRFLOW

4-0"

(BOTH

SIDES)

3‘-6-7

(024,

028)*

4-

4(034)

REMOVABLE

Ss

N

s

v

m_L

END

PANELS

^

3-11-2

(024,028)

4'-l0“

(034)

38AQ024,028,034

Fig.

1

—

Dimensions

‘Measurements

between

mount¬

ing

holes

Certified

dimension

drawings

available

upon

request

LEGEND

(38AQ024,028,034)

A

—

2V2-in.

Diam

K

O

for

Suction

Line

B

—

1%-in.

Diam

K.O.

for

Liquid

Line

(024,034)

1V2-in.

Diam

K.O.

for

Liquid

Line

(028)

C

7

/s-in.

Diam

K

O.

for

Control

Power

D

—

3%-in

Diam

K

O

for

Unit

Power

E

—

Two

7

/s-in

Diam

K

O.

for

Defrost

Interlock

Wiring

Manufacturer

reserves

the

right

to

discontinue,

or

change

at

any

time,

specifications

or

designs

without

notice

and

without

incurring

obligations.

Book

1

PC111

Catalog

No

533-846

Printed

in

U

S

A

Form

38AQ-9SI

Pg

1

1-89

Replaces:

38AQ-5SI

Tab

5a

For

replacement

items

use

Carrier

Specified

Parts

•

Allow

sufficient

space

for

airflow

clearance,

wiring,

refrigerant

piping

and

servicing

unit.

See

Fig.

1.

•

Locate

unit

so

that

condenser

airflow

is

unrestricted

on

all

sides

and

above.

•

Unit

has

legs

for

mounting

on

level

pad.

See

Fig.

2

and

Table

1

for

weight

distribution

based

on

recommended

support

points.

NOTE:

If

vibration

isolators

are

required

for

a

par¬

ticular

installation,

use

the

data

in

Table

1

and

Fig.

2

to

make

proper

selection.

Step

2

—

Rig

and

Locate

the

Unit

A

CAUTION

Be

sure

unit

panels

are

securely

in

place

prior

to

rigging.

Be

careful

rigging,

handling

and

installing

unit.

Improper

unit

location

can

cause

system

mal¬

function

and

material

damage.

RIGGING

—

Lift

units

at

points

3,

4,

7,

8

(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

sides

of

unit.

While

unit

is

on

skid,

it

can

be

rolled

or

dragged.

Step

3

—

Mount

Compressor

COMPRESSOR

MOUNTING

As

shipped,

the

com¬

pressor

is

held

down

by

special

self-locking

bolts

and

lockwashers.

After

unit

is

installed,

remove

self-locking

bolts

one

at

a

time

and

reassemble

with

flanged

washers

and

neoprene

snubbers

as

shown

in

Fig.

4.

The

flanged

washers

and

neoprene

snubbers

are

shipped

in

a

cloth

bag

tied

to

one

of

the

compressor

feet.

Tighten

all

4

bolts,

then

loosen

each

until

the

flanged

washer

can

be

moved

sideways

with

finger

pressure.

Step

4

—

Complete

Refrigerant

Piping

Connections

SIZE

REFRIGERANT

LINES

—

Consider

length

of

piping

required

between

outdoor

and

indoor

units,

amount

of

liquid

lift

and

compressor

oil

return.

Refer

to

Part

3

of

Carrier

System

Design

Manual

for

line

sizing

information.

Refer

to

indoor

unit

installation

instruc¬

tions

for

additional

information.

Maximum

liquid

line

length

is

100

feet.

Carefully

determine

the

minimum

expected

unit

capacity

and

size

interconnecting

lines

accordingly.

For

low

load

condi¬

tions,

determine

if

there

is

a

need

for

double

suction

risers

per

Carrier

System

Design

Manual.

Consider

vapor

line

as

hot

gas

line.

Consider

line

sizes

for

heating

as

well

as

cooling

capacities.

IMPORTANT:

SPREADER

BARS

MUST

BE

USED

BETWEEN

POINTS

3-4

AND

7-8

n

□

-7

□

"7

c

□

-

1

T

_

—

COIL

COMPR

SECTION

SECTION

~i

+

r

J:_c

_

17

3

5

TOP

VIEW

LEG

LOCATIONS

LIFTING

POINTS

Fig.

2

—

Weight

Distribution

PLACING

UNIT

—

Place

unit

so

that

airflow

is

un¬

restricted

above.

Provide

clearance

around

the

unit

as

shown

in

Fig.

1.

Remove

6

hold-down

bolts,

releasing

skid.

The

legs

are

attached

to

base

skid.

A

CAUTION

Piping

must

be

properly

sized

and

installed

for

the

system

to

operate

efficiently.

—

FILTER

DRIERS

—

38AQ

units

have

factory-installed

filter

driers.

It

is

not

necessary

to

add

filter

drier

and

check

valve

arrangements

in

interconnecting

piping.

It

is

recom¬

mended

that

a

field-supplied

liquid

moisture

indicator

be

installed

in

liquid

line.

Indoor

units

provide

filter

driers

with

heat

pump

piping

packages,

for

field

installation.

Refer

to

indoor

unit

installation

instructions

for

details.

Complete

refrigerant

piping

from

indoor

coil

to

out¬

door

coil

before

opening

liquid

and

suction

lines

at

the

heat

pump

unit.

See

Table

3

for

proper

refrigerant

charge

and

piping

selection

data.

PROVIDE

SAFETY

RELIEF

—

A

fusible

plug

is

located

on

the

liquid

line

before

the

liquid

valve

and

on

top

of

the

accumulator

(Fig.

3).

DO

NOT

CAP

THIS

PLUG.

If

local

code

requires

additional

safety

devices,

install

as

directed.

Block

up

or

suspend

unit.

With

bolts

supplied,

secure

legs

(see

Fig.

5)

to

unit

(1,

2,

3,

4,

5

and

6

in

Fig.

2

and

Table

1).

Table

1

—

Weights

UNIT

38AQ

WEIGHT

(lb)

TOTAL

Leg

Location

1

2

3

4

5

6

024

2040

204

204

670

670

146

146

028

2160

203

203

592

642

235

285

034

2500

286

286

834

834

130

130

The

unit

may

be

mounted

on

a

full

pad

or

on

raised

supports

at

each

leg.

Weight

distribution

shown

in

Fig.

2

will

determine

type

of

support

required.

Bolt

unit

securely

to

pad

or

supports

when

positioned

and

leveled.

HEAD

PRESSURE

CONTROL

—Fan

cycling

for

head

pressure

control

is

a

standard

offering

but

functions

in

cooling

mode

only.

The

no.

2

fan

cycles

as

a

function

of

liquid

pressure

sensed

by

fan

cycling

pressure

switch

(FCPS).

Fan

no.

3

cycles

as

a

function

of

outdoor

air

temperature

through

the

action

of

the

air

temperature

switch

(ATS).

See

Table

2

for

settings.

These

switches

are

automatically

bypassed

in

heating

mode.

Table

4

shows

minimum

outdoor

ambient

temperatures

at

which

units

will

operate

and

provide

full

cooling

capacity.

RECEIVER

—

No

receiver

is

provided

with

the

unit;

it

is

recommended

that

one

not

be

used.

PIPING

PROCEDURE

—

Do

not

remove

caps

from

vapor

and

liquid

line

stubs

in

compressor

compartment

until

piping

connections

are

ready

to

be

made.

Pass

nitro¬

gen

or

other

inert

gas

through

piping

while

brazing,

to

prevent

formation

of

copper

oxide.

Install

thermostatic

expansion

valves

in

liquid

line

ahead

of

each

indoor

coil

section.

2

SUCTION

PIPING

AT

INDOOR

COIL

AND

TXV

BULB

LOCATION

—

The

purpose

of

these

recom¬

mendations

is

to

achieve

good

mixing

of

refrigerant

leaving

indoor

coil

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

TXV

sensing

bulb

should

be

located

on

a

vertical

riser

where

possible.

If

a

horizontal

location

is

neces¬

sary,

secure

the

bulb

at

approximately

the

4

o’clock

position.

3.

Size

suction

line

from

indoor

coil

through

the

riser

for

high

velocity.

Enter

suction

pipe

sizing

charts

in

the

Carrier

System

Design

Manual

at

design

tons

and

equivalent

length

(for

2

F

loss).

If

reading

falls

between

2

sizes

on

chart,

choose

the

smaller

pipe

size.

Suction

piping

for

the

high

velocity

section

should

be

selected

for

about

0.5

F

friction

loss.

If

a

2

F

loss

is

allowed

for

the

entire

suction

line,

1.5

F

is

left

for

the

balance

of

the

suction

line

and

it

should

be

sized

on

that

basis.

Check

that

high-velocity

sizing

is

adequate

for

oil

return

up

the

riser.

When

the

compressor

is

below

indoor

coil,

the

riser

at

indoor

coil

does

not

have

to

extend

as

high

as

the

top

level.

After

a

15

diameter

riser

has

been

provided,

suction

line

may

elbow

down

immediately.

Table

2

—

Physical

Data

UNIT

38AQ

024

028

034

UNIT

38AQ

024

[

028

034

OPERATING

WEIGHT

(lb)

2040

2160

2500

CONTROLS

(cont)

REFRIGERANT

Operating

Charge

(lb)*

55

R-22

61

71

Fan

Cycling

Press

Switch

(FCPS)—

No

2

Fan

Cycling

COMPRESSOR

Model

No

Cylinders

06E2250

4

06E6265

6

06E2275

6

Opens

(psig)

Closes

(psig)

126

±4

257

:'

0

s

Oil

(pts)

Crankcase

Heater

(watts)

14

19

180

19

THERMOSTAT

Defrost

Thermostat

(DFT)

Opens

(F)

Closes

(F)

OUTDOOR

AIR

FANS

Number

Rpm;

60-Hertz

Diameter

(in

)

Motor

Hp

Cfm

Kilowatts

1140

(3-Ph

26

3/4

15

000

34

3

);

1075

(Sir

30

1

24

000

34

l

tgte-Phase)

30

1

24

000

3

6

65

±5

28

±3

Fan

Cycling

Thermostat

(ATS)

—

No

3

Fan

Cycling

Opens

(F)

Closes(F)

70

±3

83

max

FUSIBLE

PLUG

SETTING

Liquid

Line

(F)

Accumulator

(F)

OUTDOOR

COIL

Rows

Deep

.

Fins/Inch

Face

Area

(sq

ft)

35

4

3

15

1

39

0

1

49

6

210

±10

170

±10

Storage

Capacity

(lb)t

70

1

77

1

99

—

OIL

PRESS

SAFETY

SWITCH

(OPS)

Set

Point

(psig)

Differential

(psig)

CONTROLS

High

Press

Switch

(HPS)

Cutout

(psig)

Cut-in

(psig)

426

±

7

320

±20

9

28

*Approximate

charge

with

25

ft

of

interconnecting

piping

Use

appropriate

charging

charts

for

actual

charging

of

unit

fRefrigerant

storage

capacity

at

120

F

condensing

temperature

with

con¬

denser

80%

full

of

liquid

Loss-of-Charge

Switch

(LCS)

—

Liquid

Line

Cutout

(psig)

Cut-in

(psig)

5

±3

20

±5

FUSIBLE

PLUG

FUSIBLE

PLUG

ACCUMULATOR

REVERSING

MUFFLER

COMPRESSOR

VALVE

SERVICE

VALVE

Fig.

3

—

Component

Locations

LOSS-OF-CHARGE

SWITCH

FAN

CYCLING

PRESSURE

SWITCH

DEFROST

THERMOSTAT

AIR

TEMPERATURE

SWITCH

COMPRESSOR

UNLOADER

SOLENOID

3

SNUBBER

FLANGED

WASHER

NEOPRENE

SNUBBER

COMPRESSOR

FOOT

ISOLATION

SPRING

Fig.

4

—

Compressor

Mounting

NOTES

1

For

mounting

dimensions,

see

Fig

1.

2

Parts

package

contains

all

fasteners

required

for

assem¬

bling

20-in.

legs

to

unit

Fig.

5

—

Mounting

Legs

for

38AQ

Units

Step

5

—

Make

Electrical

Connections

POWER

SUPPLY

—

Electrical

characteristics

of

avail¬

able

power

supply

must

agree

with

nameplate

rating.

Supply

voltage

must

be

within

tolerances

shown

in

Table

6.

See

Fig.

6

for

System

Label

Diagram.

Phase

unbalance

must

not

exceed

2%.

Operation

of

unit

on

improper

supply

voltage

or

with

excessive

phase

un¬

balance

constitutes

abuse

and

is

not

covered

by

Carrier

Warranty

.

POWER

WIRING

—

All

power

wiring

must

comply

with

applicable

local

requirements

and

National

Elec¬

trical

Codes.

Install

a

field-supplied

branch

circuit

dis¬

connect

switch

of

a

type

that

can

be

locked

OFF

or

OPEN.

Run

power

wires

from

disconnect

switch

through

unit

power

opening

(D

on

Fig

1)

and

connect

to

terminal

block

just

inside

opening.

See

Table

5

for

maximum

allowable

wire

size.

Power

terminal

block

is

in

the

control

box.

Remove

outer

panel

and

#10

screw

on

the

door.

Swing

door

open,

remove

screws

on

barrier

panel

and

remove

barrier

panel.

Replace

barrier

panel

when

power

wiring

is

completed.

Condenser

fans

must

rotate

clockwise

when

viewed

from

above.

If

necessary,

correct

direction

of

fan

rotation

by

reversing

any

2

power

input

wires

at

disconnect

switch.

Affix

crankcase

heater

decal

to

unit

disconnect

switch.

CONTROL

CIRCUIT

WIRING

—

Internal

control

voltage

on

38

AQ

units

is

both

115-volts

and

24-volts.

All

control

circuit

wiring

must

comply

with

applicable

local

Table

3

—

Refrigerant

(R-22)

Charge

and

Piping

Selection

Data

LENGTH

OF

PIPING

(ft)*

OUTDOOR

0-25

26-60

61-100f

UNIT

38AQ

[

Line

Size

(in.

O.D.)

L

V

L

V

L

V

024

Ye

1

Ye

7

/s

1

Ye

Ve

1

%

028

Ye

1Ye

Vs

1Ye

%

2Ye

034

Ye

1

Ye

Vs

2Vs

7

/s

2Vs

Approximate

System

Charge

(lb)J

024

55

58

75

028

61

65

83

034

71

79

93

L

—

Liquid

Line

V

—

Vapor

Line

*

Approximately

4

elbows

assumed

in

determining

pipe

sizes

tMaximum

length

of

interconnecting

piping

is

100

feet.

^Approximate

system

charge

is

for

estimating

only

It

includes

charge

requirements

for

one

outdoor

unit,

matching

indoor

coil,

and

interconnecting

piping

System

should

be

charged

in

accordance

with

installation

instructions

—

NOTE

Maximum

liquid

line

size

is

7

/e-in

OD

Maximum

R-22

system

charge

is

85

lb

(024),

951b

(028),

105

lb

(034)

Table

4

—

Minimum

Outdoor

Air

Operating

Temperature

MINIMUM

OUTDOOR

UNIT

COMPR

COND

TEMPERATURE

(F)*

38AQ

CAP.

(%)

TEMP

(F)

Std

Unit

32LT

Motormaster®

024

100

90

28

-20

50

80

41

-20

028

100

90

34

-20

67

80

37

-20

034

100

90

30

-20

67

80

33

-20

*

Applies

to

cooling

mode

of

operation

only

Table

5

—

Maximum

Allowable

Field

Wire

Sizes

UNIT

38AG

VOLTS

(60-Hz)

WIRE

SIZE

CONN.

024,028,034

208/230

6

AWG

to

350

MCM

TB

460,

575

14

AWG

to

2/0

TB

—

Terminal

Block

(with

integral

compression

terminal)

and

national

codes

.

Route

remote

control

wiring

to

unit

control

box

through

control

opening

(C

on

Fig.

1)

and

connect

to

control

terminal

block

inside

the

control

box.

All

external

control

wiring

is

24-volt,

NEC

Class

2.

—

SAIL

SWITCH

—

It

is

highly

recommended

that

an

indoor

airflow

switch

(field

installed)

be

installed

and

interlocked

with

the

outdoor

unit,

to

prevent

the

outdoor

unit

from

operating

in

the

event

of

indoor

airflow

failure

(example:

broken

fan

belt).

Operation

of

compressor

with

no

indoor

airflow

causes

compressor

to

operate

in

a

vacuum

which

can

damage

bearing

surfaces.

Therefore,

install

a

field-supplied

sail

switch

in

the

supply

air

duct¬

work

of

the

mating

indoor

fan

coil

unit,

and

wire

to

outdoor

unit.

See

Fig

7.

4

Table

6

—

Electrical

Data

(3

Phase,

60

Hz)

UNIT

COMPRESSOR

FANS

38AQ

Model

Volts

MCA

MOCP

RLA

LRA

MTA

Total

Kw

(total)

FLA

(ea)

Nameplate

|

Supplied*

No.

1

No

2

No.

3

Min

Max

510

208/230

187

253

103

175

76

0

345

53J

45

4

6

46

024

600

460

414

508

51

80

1

36

0

173

50f

3

3

4

1

9

1

9

1

9

100

575

518

632

41

60

28

6

120

40f

1

6

1.6

1.6

510

208/230

187

253

145

225

ioocP

446

70*

6

2

6

6

6

6

028

600

460

414

508

69

110

48

0

223

33*

3

34

3

0

3

0

3

0

100

575

518

632

62

100

43.4

164

6;t

2.5

2.5

2.5

510

208/230

187

253

170

250

120

0

506

84*

6

2

6

6

6

6

034

600

460

414

508

72

110

50

0

253

35*

3

3

6

30

3

0

3

0

100

575

518

632

64

100

45

0

176

63*

2

5

2

5

2

5

FLA

—

Full

Load

Amps

(fan

motors)

LRA

—

Locked

Rotor

Amps

MCA

—

Minimum

Circuit

Amps

Complies

with

NEC

Section

430-24

MOCP

—

Maximum

Overcurrent

Protection

(fuse

only)

MTA

—

Must

Trip

Amps

(circuit

breaker)

NEC

—

National

Electric

Code

RLA

—

Rated

Load

Amps

(compressor)

*Units

are

suitable

for

use

on

electrical

systems

where

voltage

supplied

to

the

unit

terminals

is

not

below

or

above

the

listed

limits

t3-Pole

circuit

breaker

*6-Pole

circuit

breaker

<5

LEGEND

EquipGnd

—

Equipment

Ground

IFC

—

Indoor

Fan

Contactor

IFM

—

Indoor

Fan

Motor

TB

—

Terminal

Block

(Board)

NOTES

1

This

diagram

applies

to

the

follow¬

ing

systems.

40RR024

with

38AQ

024,

40RR028

with

38AQ028

and

40RR034

with

38AQ034.

2.

For

wiring

details

of

components,

see

schematic

in

each

component

3

Use

copper

conductors

only

for

IFM

wiring

Fig.

6

—

System

Label

Diagram;

38AQ024,028,034

INU

I

,

1

Locate

blue

wire

between

|

1

]

on

TB2B

and

terminal

7

of

CR3

and

cut

2

Splice

airflow

switch

(AFS)

(field

supplied)

contact

wires

(field

provided)

to

2

ends

of

cut

blue

wire

as

depicted

AFS

—

Airflow

switch

(sail

switch)

-Factory

Wiring

-Field

Wiring

TB2B

Q>

BLU

^SPLICE^

CR3

BLU

I-(D^hk-<i>

I

AFS

I

L

-

IF

-

1

Fig.

7

—

Field

Wiring

for

Airflow

Switch,

38AQ024,

028

or

034/40RR

5

START-UP

Before

Starting

Unit,

check

the

following:

1.

Compressor

oil

level

must

be

visible

in

the

compressor

oil

sight

glass.

Add

oil

if

necessary.

(See

Oil

Charge.)

2.

Compressor

hold-down

bolts

must

be

snug

but

not

tight.

3.

All

internal

wiring

connections

must

be

tight;

all

barriers

and

covers

must

be

in

place.

4.

Electrical

power

sources

must

agree

with

unit

name¬

plate

rating.

5.

All

service

valves

must

be

open.

6.

Crankcase

heater

must

be

firmly

locked

into

com¬

pressor

crankcase.

Crankcase

heater

is

inserted

at

the

factory

with

thermal

conductive

grease.

Evacuate

and

Dehydrate

entire

refrigerant

system

as

described

in

the

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Section

1-7.

Leak

Test

entire

refrigerant

system

by

the

pressure

method

described

in

the

Carrier

Standard

Service

Tech¬

niques

Manual,

Chapter

1,

Section

1-6.

Use

refrigerant

specified

for

unit

at

approximately

25

psig

backed

up

with

an

inert

gas

to

a

total

pressure

not

to

exceed

200

psig.

Energize

Branch

Circuit

—

Close

field

disconnect

switch

to

energize

compressor

crankcase

heater.

Set

room

thermostat

to

prevent

unit(s)

from

starting

at

this

time.

Heating/Cooling

Thermostat

(HH07AT072)

has

an

adjustable

heat

anticipator

for

both

first-

and

second-stage

heating

circuits.

SETTINGS

—

Set

adjustment

lever

for

first-stage

anti¬

cipator

at

0.79

(left-hand

side).

Set

adjustment

lever

for

second-stage

anticipator

at

0.42

(right-hand

side).

NOTES:

1

All

3

outdoor

fans

must

be

operating

2

To

be

used

with

approved

40RR

combinations

only

3

Applies

to

all

approved

combinations

Fig.

8

—

Cooling

Cycle

Charging

Chart,

40RR/38AQ024

6

To

Charge

System

—

Refer

to

Carrier

Standard

Service

Techniques

Manual,

Chapter

1

and

the

pro¬

cedures

described

below.

Use

Fig.

8

for

charging

any

40RR/38AQ024

combination;

Fig.

9

for

charging

any

40RR/38AQ028

combination;

and

Fig.

10

for

charging

any

40RR/38AQ034

combination.

Charge

unit

in

cooling

mode

only.

Charging

unit

in

heating

mode

could

result

in

overcharging.

1.

Use

Refrigerant

R-22

only.

2.

Regulate

refrigerant

drum

valve

to

maintain

suction

pressure

at

80

psig

while

charging.

Charge

with

vapor

only

at

suction

side

of

unit.

NOTE:

Do

not

depend

on

sight

glass

when

charg¬

ing

unit.

Use

charging

chart.

3.

Allow

system

to

operate

for

20

minutes.Take

tem¬

perature

and

pressure

readings

at

liquid

service

valve

and

check

values

with

the

charging

chart.

4.

Measure

liquid

line

temperature

close

to

the

liquid

service

valve,

and

the

pressure

at

the

Schrader

port

on

the

liquid

line

service

valve.

Plot

point

on

the

charging

chart.

If

point

is

above

the

line,

add

charge.

If

point

is

below

the

line,

remove

charge

until

operating

point

falls

on

the

line.

5.

Record

final

refrigerant

charge

on

unit

nameplate.

To

Start

Unit

—

After

compressor

crankcase

heater

has

been

on

for

at

least

24

hours,

set

room

thermostat

so

unit

will

start

on

desired

mode.

HEATING

—

Place

thermostat

selector

at

HEAT

and

set

temperature

selector

above

room

ambient.

COOLING

—

Place

thermostat

selector

at

COOL

and

set

temperature

selector

below

room

ambient.

NOTES

1

All

3

outdoor

fans

must

be

operating

2

To

be

used

with

approved

40RR

combinations

only

3.

Applies

to

all

approved

combinations.

Fig.

10

—

Cooling

Cycle

Charging

Chart,

40RR/38AQ034

Oil

Charge

(Table

1

)

—

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.

Use

only

Carrier-approved

compressor

oil.

Approved

oils

are:

Suniso

3GS

Capella

B1

DuPont

Synthetic

Refrigeration

Oil

(150

SSU

only)

Zerol

150

(synthetic)

Do

not

reuse

drained

oil

or

use

any

oil

that

has

been

exposed

to

atmosphere.

Procedures

for

adding

or

remov¬

ing

oil

are

given

in

Carrier

Standard

Service

Techniques

Manual,Chapter

1,

Refrigerants.

If

oil

is

added,

run

unit

for

additional

10

minutes.

Stop

unit

and

check

oil

level.

If

level

is

still

low,

add

oil

only

after

determining

that

piping

system

is

designed

for

proper

oil

return

and

that

the

system

is

not

leaking

oil.

Check

Operation

of

all

safety

controls.

Replace

all

service

panels.

Be

sure

that

control

panel

cover

is

closed

tightly.

8

SERVICE

Capacity

Control

is

by

one

electrically

actuated

unloader

which

controls

2

cylinders.

Unloader

does

not

require

field

adjustment.

Compressor

Motor

Protection

CIRCUIT

BREAKER

—

A

manual

reset

calibrated-trip

magnetic

circuit

breaker

protects

the

compressor

against

overcurrent.

Do

not

bypass

connections

to

increase

size

of

breaker

for

any

reason

If

trouble

occurs,

determine

cause

and

correct

before

resetting

the

breaker.

Circuit

breaker

Must

Trip

Amps

(MTA)

are

listed

in

Table

6,

Electrical

Data.

DISCHARGE

GAS

THERMOSTAT

—

A

sensor

in

the

discharge

gas

of

the

compressor

reacts

to

excessively

high

discharge

gas

temperature

and

shuts

off

compressor.The

high

temperature

of

discharge

gas

is

a

direct

indication

of

an

overtemperature

condition

in

compressor

motor.

CRANKCASE

HEATER

—

The

compressor

has

an

electric

heater

located

in

the

bottom

cover,

held

in

place

by

a

clip.

Heater

musi

be

tight

to

prevent

backing

out

(heater

will

burn

out

if

exposed

to

air).

The

heater

is

wired

into

compressor

control

circuit

through

a

relay

to

energize

only

when

compressor

shuts

off.

This

keeps

the

oil

at

a

temperature

that

will

prevent

excessive

absorption

of

refrigerant

during

shutdown

periods.

Crankcase

heater

is

located

in

a

lockout

circuit.

If

crankcase

heater

is

defec¬

tive,

the

compressor

locks

off

Heat

pump

remains

off

until

corrective

action

is

taken.

This

lockout

circuit

cannot

be

reset

by

adjusting

the

thermostat.

Crankcase

heater

should

be

energized

at

all

times

when

unit

is

not

running

except

during

prolonged

shutdown

or

during

servicing.

In

these

cases,

heater

should

be

energized

for

24

hours

before

unit

is

restarted.

Fan

Motor

Protection

—

Fan

motors

are

inherently

protected,

grouped

on

a

single

circuit

breaker.

Fan

Adjustment

—

When

replacing

a

fan,

adjust

fan

until

top

surface

of

hub

plate

is

below

top

of

orifice

ring

as

indicated

in

Fig

11.

Then,

tighten

both

setscrews,

located

over

the

keyway

of

fan

hub

of

motor

shaft.

Seal

recessed

area

of

fan

hub

bore

with

Permagum

to

prevent

rusting.

Head

Pressure

Control

reduces

condensing

capacity

under

low-ambient

conditions.

For

intermediate

season

operation,

fan

cycling

is

employed.

Fan

no.

2

is

cycled

by

pressure

control,

with

the

pressure

sensor

located

in

the

liquid

line.

Fan

no.

3

is

cycled

by

an

air

temperature

thermostat

(see

Table

2).

Liquid

Line

Solenoid

Valve

closes

when

compressor

is

off,

and

opens

when

compressor

is

on.

The

valve

mini¬

mizes

refrigerant

migration

during

heat

pump

OFF

cycle,

protecting

against

flooded

starts.

Accumulator

Oil

Return

is

external.

The

accu¬

mulator

drains

through

an

extenal

port

at

bottom

of

accumulator.

The

port

feeds

an

orifice

which

regulates

the

rate

of

oil

and

refrigerant

returned

to

the

compressor.

The

orifice

is

removable

and

cleanable

when

the

system

does

not

contain

refrigerant.

The

oil

return

mechanism

also

contains

a

solenoid

valve

that

opens

when

compressor

is

ON,

and

closes

when

compressor

is

OFF.

The

oil

return

solenoid

does

not

allow

liquid

refrigerant

to

drain

from

the

accumulator

during

the

heat

pump

OFF

cycle,

pro¬

tecting

the

compressor

against

flooded

starts.

Lubrication

FAN

MOTORS

—

Fan

motors

have

permanently

lubri¬

cated

bearings.

No

provisions

for

lubrication

are

made.

COMPRESSOR

—

The

compressor

has

its

own

oil

supply.

Loss

of

oil

due

to

a

leak

in

the

system

should

be

the

only

reason

for

adding

oil

after

system

has

been

in

operation.

Coil

Cleaning

—

Clean

coils

with

a

vacuum

cleaner,

fresh

water,

compressed

air

or

a

bristle

brush

(not

wire).

Set

up

coil

cleaning

as

part

of

a

planned

maintenance

schedule

when

units

are

installed

in

corrosive

environ¬

ments.

Wash

all

accumulations

of

dirt

from

coil

in

these

applications.

Keep

condenser

coil

drain

holes

free

of

dirt

and

debris

to

ensure

adequate

coil

drainage.

UNIT

DIMENSION

A

(in.)

38AQ

Center

Fan

End

Fan

024

3

/4

3

/4

028

034

V/,

6

2

3

4

Fig.

11

—

Fan

Adjustment

9

OPERATING

SEQUENCE

(Refer

to

wiring

diagrams

in

38AQ

wiring

booklet)

Standby

(OFF)

Mode

—

During

the

standby

or

OFF

mode,

crankcase

heater

is

energized.

Reversing

valve

may

or

may

not

be

energized

depending

on

mode

of

operation

(heating

or

cooling)

when

thermostat

is

satisfied.

COOLING

—

When

thermostat

calls

for

first-stage

cooling

(TCI

closed),

indoor

fan

motor

starts

imme¬

diately.

Compressor

and

outdoor

fans

start

between

3

seconds

and

5

minutes

depending

on

length

of

time

unit

is

off

after

thermostat

is

satisfied,

due

to

5-minute

Time

Guard®

II

circuit.

Outdoor

fan

motors

nos.

2

and

3

may

or

may

not

operate

depending

on

position

of

fan

cycling

pressure

switch

(FCPS)

and

air

temperature

switch

(ATS).

The

reversing

valve

solenoid

(RVS)

becomes

de¬

energized

causing

reversing

valve

to

shift

to

cooling

position.

Crankcase

heater

is

off.

Liquid

line

and

accu¬

mulator

oil

return

solenoid

valves

open,

allowing

refrig¬

erant

and

oil

flow.

Defrost

Timer

does

not

operate

during

cooling

mode.

When

thermostat

calls

for

second-stage

cooling

(TC2

closed),

unloader

is

de-energized

causing

compressor

to

run

fully

loaded.

If

a

malfunction

occurs,

causing

high-pressure

switch

(HPS)

discharge

gas

thermostat

(DGT)

or

loss-of-charge

switch

(LCS)

to

open,

compressor

and

outdoor

fans

stop

and

are

locked

out

by

a

Signal-Loc

circuit,

and

a

warning

light

comes

on

at

the

thermostat.

RVS

remains

de-energized

so

reversing

valve

does

not

shift.

These

safeties

reset

by

adjusting

thermostat

up

to

open

TCI

and

TC2,

or

by

momentarily

switching

subbase

to

OFF

posi¬

tion

When

thermostat

is

satisfied

(TCI

open),

com¬

pressor,

indoor

fan

motors

shut

off.

Liquid

line

and

accumulator

oil

return

solenoid

valves

close.

Reversing

valve

does

not

shift,

but

remains

in

cooling

position

until

there

is

a

call

for

heating.

If

compressor

oil

pressure

is

lost,

or

if

oil

pressure

fails

to

build

on

start-up,

an

oil

pressure

safety

switch

shuts

down

unit.

Switch

must

be

manually

reset

at

the

unit.

DO

NOT

RESET

MORE

THAN

ONCE!

If

oil

pressure

switch

trips,

determine

cause

and

correct.

DO

NOT

JUMPER

OIL

PRESSURE

SAFETY

SWITCH!

Crankcase

Heater

is

in

a

lockout

circuit.

If

crankcase

heater

is

defective,

compressor

is

locked

off.

The

heat

pump

remains

off

until

corrective

action

is

taken.

This

lockout

circuit

cannot

be

reset

by

adjusting

the

thermostat.

Unit

is

equipped

with

a

no-dump

reversing

valve

circuit.

When

unit

is

in

cooling

mode,

reversing

valve

remains

in

cooling

mode

position

until

thermostat

calls

for

heating.

When

unit

is

in

heating

mode,

reversing

valve

remains

in

heating

mode

position

until

thermostat

calls

for

cooling.

HEATING

—

When

thermostat

calls

for

heating

(TH1

closed),

indoor

fan

motor

starts.

Compressor

and

out¬

door

fans

start

between

3

seconds

and

5

minutes

depend¬

ing

on

length

of

time

unit

is

off

after

thermostat

is

satis¬

fied,

due

to

5-minute

Time

Guard

II

circuit.

Liquid

line

and

accumulator

oil

return

solenoid

valves

open

when

compressor

operates,

and

close

when

compressor

is

OFF.

Compressor

always

runs

fully

loaded

in

the

heating

mode.

All

3

outdoor

fans

also

run

during

heating

mode.

Revers¬

ing

Valve

Solenoid

(RVS)

shifts

for

heating

operation

at

start-up.

Defrost

Timer

runs

continuously

during

heating

mode.

Crankcase

heater

is

off

whenever

compressor

is

on.

If

a

malfunction

occurs,

causing

high-pressure

switch

(HPS),

discharge

gas

thermostat

(DGT)

or

loss-of-charge

switch

(LCS)

to

open,

compressor

and

outdoor

fan

motors

stop

and

are

locked

out

by

a

Signal-LOC

circuit,

and

a

warning

light

appears

on

the

thermostat.

RVS

remains

energized

so

reversing

valve

does

not

shift.

Reset

lockout

system

by

adjusting

thermostat

down

to

open

TH1

and

TH2,

or

by

momentarily

switching

subbase

to

the

OFF

position.

If

compressor

oil

pressure

is

lost

or

if

oil

pres¬

sure

fails

to

build

on

start-up,

an

oil

pressure

safety

switch

shuts

down

unit.

Switch

must

be

manually

reset

at

the

unit.

DO

NOT

RESET

MORE

THAN

ONCE!

If

oil

pressure

switch

trips,

determine

cause

and

correct.

DO

NOT

JUMPER

OIL

PRESSURE

SAFETY

SWITCH!

Crankcase

Heater

is

in

a

lockout

circuit.

If

crankcase

heater

is

defective,

compressor

is

locked

off.

The

heat

pump

remains

off

until

corrective

action

is

taken.

This

lockout

circuit

cannot

be

reset

by

adjusting

the

thermo¬

stat.

When

thermostat

is

satisfied

(TH1

opens),

com¬

pressor,

indoor

fan

motor

and

outdoor

fan

motors

shut

off.

Reversing

valve

remains

in

heating

mode

until

thermostat

calls

for

cooling.

If

outdoor

ambient

temperature

is

above

approxi¬

mately

45

F,

defrost

thermostat

(DFT)

senses

outdoor

coil

temperature

is

above

28

F,

and

prevents

start

of

any

defrost

cycle.

When

outdoor

ambient

temperature

is

below

approximately

45

F,

DFT

senses

outdoor

coil

temperature

is

below

28

F

and

allows

defrost

circuitry

to

be

energized

every

60

minutes.

When

this

occurs,

revers¬

ing

valve

switches

back

to

cooling

position

and

outdoor

fans

shut

off.

Defrost

is

terminated

when

liquid

refrig¬

erant

becomes

warm

enough

to

open

defrost

thermostat.

Defrost

timer

limits

length

of

each

defrost

cycle

to

a

maximum

of

10

minutes.

Two

defrost

interlock

relays

are

provided

for

use

on

systems

having

more

than

one

38AQ

unit.

When

any

38AQ

unit

is

in

defrost

mode,

up

to

2

additional

38AQ

units

can

be

prevented

from

defrosting

by

temporarily

stopping

their

defrost

timer

motors

until

defrost

on

another

unit

is

completed.

Compressor

and

outdoor

fan

motor

overcurrent

pro¬

tection

is

achieved

with

circuit

breakers

(heating

and

cooling

modes).

These

require

manual

reset

at

the

out¬

door

unit

control

box.

Refer

to

Fig.

12

for

typical

38

AQ

heat

pump

refrigerant

circuit

operation.

10