Carrier 38HD018 Dimensions and installation guide

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5

Table of contents

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38HD

’

Split

System

Condensing

Units

HEATING

&

COOLING

Installation,

Start-Up

and

Service

Instructions

SAFETY

CONSIDERATIONS

Installing

and

servicing

air

conditioning

equipment

can

be

hazardous

due

to

system

pressure

and

electrical

components

Only

trained

and

qualified

service

personnel

should

install

or

service

air

conditioning

equipment.

Untrained

personnel

can

perform

basic

maintenance,

such

as

cleaning

and

replacing

filters.

All

other

opera¬

tions

should

be

performed

by

trained

service

personnel.

When

working

on

air

conditioning

equipment,

observe

precautions

in

literature

and

on

tags

and

labels

attached

to

unit

Follow

all

safety

codes.

Wear

safety

glasses

and

work

gloves.

Use

quenching

cloth

for

brazing

operations.

Have

fire

extinguisher

available.

Read

these

instruc¬

tions

thoroughly.

Consult

local

building

codes

and

National

Electrical

Code

(NEC)

for

special

installation

requirements

A

WARNING

Before

installing

or

servicing

system,

always

turn

off

main

power

to

system.

There

may

be

more

than

one

disconnect

switch.

Turn

off

accessory

heater

power

if

applicable

Electrical

shock

can

cause

personal

injury.

Fig.

1

-

Model

38HD

INSTALLATION

Step

1

—

Complete

Pre-Installation

Checks.

UNPACK

UNIT

(See

Fig

I.)

—

Move

unit

to

final

location

Remove

carton

from

unit

being

careful

not

to

s

damage

service

valves

and

grilles.

•

INSPECT

SHIPMENT

—

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.

Allow

sufficient

space

for

airflow

clearance,

wiring,

refrigerant

piping,

and

servicing

unit.

See

Fig.

2

and

3.

Locate

unit

so

that

condenser

airflow

is

unrestricted

on

both

sides.

Refer

to

Fig

2

and

3.

Unit

may

be

mounted

on

a

level

pad

directly

on

base

legs

or

mounted

on

raised

pads

at

support

points

See

Fig.

2

and

3

for

center

of

gravity

CHECK

ACCURATER®

—

The

correct

AccuRater

(bypass

type)

refrigerant

control

is

required

for

cooling

system

capacity

optimization.

An

AccuRater

with

field-

replaceable

piston

(see

Fig.

4)

is

supplied

on

evaporator.

Use

Optimization

Chart,

Table

1,

to

find

AccuRater

piston

size

required

for

condenser/evaporator

system

being

installed.

Note

that

one

of

2

types

of

AccuRaters

can

be

found

on

the

indoor

unit.

Determine

from

Fig.

4

and

Table

1

which

type

is

in

the

indoor

unit.

Do

not

inter¬

change

components

between

AccuRater

types.

Matching

of

condensing

unit

with

evaporator

may

require

field

replacement

of

piston.

Refer

to

Table

1.

Replace

piston,//

required,

before

connecting

refrigerant

lines.

Piston

replacement

instructions

are

included

in

evaporator

installation

book.

After

system

installation

is

complete,

see

Refrigerant

Charging

to

check

and/or

adjust

refrig¬

erant

charge

Manufacturer

reserves

the

right

to

discontinue,

or

change

at

any

time,

specifications

or

designs

without

notice

and

without

incurring

obligations.

Book

1

4

PC111

Catalog

No

533-850

PrintedinUSA

Form38HD-1SI

Pgi

6-89

Replaces:

New

Tab

3a

2a

For

replacement

items

use

Carrier

Specified

Parts.

**''

CLEARANCES

FOR

SERVICE

AND

AIRFLOW.

ALLOW

6

IN.

ABOVE

UNIT.

6

IN.

k

6

H

_L

HIGH

VOLTAGE

1-1/8'

DIA.

HORIZONTAL

AIR

DISCHARGE

FIS®

[MT

¥

0

E

W

[^D@[Hnr

I

EH

WOiW

UNIT

WEIGHT

A

B

C

38HD018

(67

1

kg)

148

lbs

(329)

r-r

(15

88)

5

/b"

(9

53)

%"

38HD024

(72

6

kg)

160

lbs

(329)

V-1"

(15

88)

5

/

8

"

(9

53)

3

/a"

38HD030

(77

6

kg)

171

lbs

(329)

r-r

(15.88)

%"

(9.53)

%"

NOTES

1

Dimensions

in

[

]

are

in

millimeters

2

Air

Direction

«=>

3.

Center

of

Gravity

^

4

Footprint

018-030,

3

7

sq

ft

(

34

m

2

)

Fig.

2

—

38HD

Dimensional

Drawing,

018-030

-[1132]

-

3'-8

9/IB

HORIZONTAL

AIR

DISCHARGE

I

FBOMT

WDIM

UNIT

WEIGHT

A

B

C

38HD036

(108

9

kg)

240

lbs

(352)

1

'-1

%"

(19

05)

3

/4"

(9

53)

3

/

8

"

38HD048

(110

7

kg)

244

lbs

(347)

1

'-1

%"

(19

05)

%"

(9.53)

%"

38HD060

(110

7

kg)

244

lbs

(368)

1'-2M>"

(22

22)

%"

(9

53)

%"

Fig.

3

—

38HD

NOTES

1

Dimensions

in

[

]

are

in

millimeters

2

Air

Direction

3

Center

of

Gravity

4

Footprint

036-060,

5

3

sq

ft

(49

m

2

)

Drawing,

036-060

RETAINER

Table

1

—

AccuRater

Optimization

Chart

TYPE

A

(Arrow

on

AccuRater

body

points

in

metering

direction.)

(Arrow

on

AccuRater

body

points

in

free

flow

direction.)

Fig.

4

—

AccuRater®

(Bypass

Type)

Components

Step

2

—

Rig

and

Mount

Unit

MOUNTING

ON

GROUND

—

Mount

on

a

solid,

level,

concrete

pad

Position

unit

so

water

or

ice

from

roof

cannot

drop

directly

onto

unit.

Stacking

Kit

38

H

D900031

and

T)41

are

available

where

such

application

is

required.

See

instructions

provided

with

accessory

kit.

If

conditions

or

local

codes

require

unit

be

fastened

to

pad,

tiedown

bolts

should

be

used

and

fastened

through

slots

provided

in

unit

mounting

feet.

MOUNTING

ON

ROOF

—

Mount

on

a

level

platform

or

frame.

RIGGING

Be

sure

|

rigging.

unit

panels

are

securely

in

place

prior

to

Keep

unit

upright.

Lift

unit

using

sling.

Use

cardboard

or

padding

under

sling,

and

spreader

bars

to

prevent

sling

damage

to

unit.

See

Fig.

5.

See

Fig.

2

and

3

for

center

of

gravity

reference.

Install

unit

so

that

coil

does

not

face

into

prevailing

winds.

If

this

cannot

be

done,

and

constant

winds

above

25

mph

are

expected,

use

Accessory

Wind

Baffle,

Part

Number

38QR900041

or

-051.

See

instruc¬

tions

provided

with

accessory

kit

Step

3

—

Complete

Refrigerant

Piping

Con¬

nections

—

Condensing

units

may

be

connected

to

evaporator

sections

using

field-supplied

tubing

of

refrig¬

erant

grade,

correct

size

and

condition.

See

Table

2.

Do

not

use

less

than

10

ft

of

interconnecting

tubing

and

do

not

bury

more

than

3

ft

of

line

set

underground.

If

any

section

is

buried,

there

must

be

a

6-in.

vertical

rise

to

the

valve

connections

on

the

outdoor

unit

OUTDOOR

UNIT

INDOOR

UNIT

INDOOR

PISTON

PISTON

TYPE

REQUIRED

SYSTEM

CHARGE

(lb)

38HD018

28RD024

40HD024

_

A

B

-

38HD024

i

28RD030

40HD024

61

A

B

55

38HD030

28RD043

40HD036

70

A

B

57

38HD036

28RD043

40HD036

73

A

B

11.5

38HD048

28RD049

40HD048

86

A

B

97

38HD060

28RD061

40HD060

88

A

B

11

2

If

more

than

the

recommended

length

is

buried,

refrig¬

erant

may

migrate

to

cooler

buried

section

during

extended

periods

of

unit

shutdown.

This

causes

refrig¬

erant

slugging

and

possibly

compressor

damage

at

start-up.

When

more

than

50

ft

of

interconnecting

tubing

and

more

than

30

ft

vertical

lift

is

used,

consider

the

amount

of

liquid

lift,

and

compressor

oil

return

See

Part

3

of

Carrier

System

Design

Manual

for

design

details,

or

contact

your

local

Distributor

If

either

refrigerant

tubing

or

indoor

coil

is

exposed

to

atmospheric

conditions

for

longer

than

5

minutes,

it

must

be

evacuated

to

1000

microns

to

eliminate

contamination

and

moisture

in

the

system.

Run

refrigerant

tubes

as

directly

as

possible,

avoiding

unnecessary

turns

and

bends.

Suspend

refrigerant

tubes

so

they

do

not

damage

insulation

on

vapor

tube

and

do

not

transmit

vibration

to

structure

Also,

when

passing

refrigerant

tubes

through

wall,

seal

opening,

so

vibration

is

not

transmitted

to

structure.

Leave

some

slack

in

refrig¬

erant

tubes

between

structure

and

unit

to

absorb

vibra¬

tion

Refer

to

evaporator

installation

instructions

for

additional

information.

USE

FILTER

DRIER

AND

MOISTURE

INDI¬

CATOR

—

The

filter

drier

is

factory

supplied.

Moisture

indicator

(sight

glass)

is

a

field-supplied

option

and

4

Table

2

—

Physical

Data

UNIT

38HD

018

024

030

036

048

060

OPER

WT

(lb),

1

ph/3

ph

148/*

160/*

171/*

240/226

244/235

244/235

REFRIGERANT

I

R-22

COMPRESSOR

Model

Oil

(pts),

initial/recharge

Crankcase

Heater

Watts

Tecumseh

AW5519

32/30

Tecumseh

AW5524

32/30

Hermetic

Carlyle

1

Carlyle

1

J30

|

J36

1

46/44

40

1

Carlyle

|

J48

Copeland

CRP5-0450

70/66

CONDENSER

AIR

FAN

1

Number

—

Rpm

Diameter

(in.)

—

no.

blades

Fan

Pitch

Motor

Hp

(NEMA)

Nominal

Cfm

18

—

3

25

|

27

Vs

1835

|

1720

|

Propeller,

C

1

—

j

1750

>irect

Drive

850

24

—

3

24

%

3900

CONDENSER

COIL

Rows

Face

Area

(sq

ft)

Fins/in.

Vh

i

.

61

2

1

15

1

2

|

12.3

!

2

CONNECTIONS

Suction

(in.),

Sweat

Liquid

(in.),

Flare

%

I

i

%

i

%

7

/s

LINE

SIZES

Suction

Liquid

%

i

%

%

|

m

CONTROLS

Pressurestat

Settings

Ui/lh

Cutout

Hlgh

Cut-in

426

±

7

320

±

20

i

«...

Cutout

Low

Cut-in

7

±

5

22

±

5

FUSIBLE

PLUG

210

F

*Not

applicable

should

be

installed

just

after

liquid

line

shutoff

valve.

PROVIDE

SAFETY

RELIEF

—

A

fusible

plug

is

Do

not

use

a

receiver

(a

receiver

is

not

provided

with

unit

located

in

unit

suction

line.

Do

not

cap

this

plug.

If

local

and

one

should

not

be

used).

code

requires

additional

safety

devices,

install

as

directed.

MAKE

PIPING

SWEAT

CONNECTIONS

—

Remove

plastic

caps

from

liquid

and

suction

service

valves.

Use

refrigerant

grade

tubing.

Service

valves

are

closed

from

the

factory

and

ready

for

brazing.

After

wrapping

the

service

valve

with

a

wet

cloth,

the

tubing

set

can

be

brazed

to

the

service

valve

using

either

silver

bearing

or

non-silver

bearing

brazing

material.

Consult

local

code

requirements.

Refrigerant

tubing

and

indoor

coil

are

now

ready

for

leak

testing.

NOTE:

Unit

is

shipped

with

R-22

factory

holding

charge

indicated

on

nameplate.

Pass

nitrogen

or

other

inert

gas

through

piping

while

brazing

to

prevent

formation

of

copper

oxide.

A

CAUTION

To

avoid

damage

while

brazing,

service

valves

should

be

wrapped

with

a

heat-sinking

material

such

as

a

wet

cloth.

Step

4

—

Complete

Electrical

Connections

POWER

WIRING

—

Unit

is

factory

wired

for

voltage

shown

on

nameplate.

Provide

adequate

fused

disconnect

switch

within

sight

of

unit,

readily

accessible,

but

out

of

reach

of

children.

Provision

for

locking

switch

open

(off)

is

advisable

to

prevent

power

from

being

turned

on

while

unit

is

being

serviced.

Disconnect

switch,

fuses,

and

field

wiring

must

comply

with

National

Electrical

Code

and

local

code

requirements.

Use

copper

wire

only

between

disconnect

switch

and

unit.

Use

minimum

60

C

wire

for

field

power

connection.

Route

power

wires

through

opening

in

unit

side

panel

and

connect

in

unit

control

box

as

shown

on

unit

label

diagram

and

Fig.

6.

Unit

must

be

grounded

5

1

ARRANGEMENT

A-(COOLlNG

ONLY)

J

ARRANGEMENT

B-ONE

TRANSFORMER

(COOLING

AND

ONE-STAGE

HEATING)

rHr

ARRANGEMENT

C-ONE

TRANSFORMER

(COOLING

AND

TWO-STAGE

HEATING)

*IFR

and

IFM

are

located

in

furnace

on

heating-cooling

applica¬

tions

If

accessory

IFR

is

required

for

cooling-only

applications,

locate

(IFR)

in

fan

coil

c

—

Contactor

(12-va)

-—

Field

Wiring

HC

—

Heating

Control

IFM

—

Indoor

Fan

Motor

IFR

—

Indoor

Fan

Relay

Trans

—

Transformer

NOTE

Refer

to

unit

wiring

label

for

wire

colors

CtoGandCtoY

connections

Fig.

6

—

Typical

Control

Circuit

Connections

CONTROL

CIRCUIT

WIRING

—

Control

voltage

is

24

volts

(40

va

minimum).

See

Fig.

6

and

unit

label

diagram

for

field-supplied

wiring

details.

Route

control

wires

through

opening

in

unit

side

panel

to

connection

in

unit

control

box.

TB

—

Terminal

Board

■

O

-

TB

Connections

-Field

Wiring

.

Factory

Wiring

Fig.

7

—

Line

Power

Connections

NOTE:

For

wire

runs

up

to

50

ft,

use

no.

18

AWG

insu¬

lated

wire

(35

C

minimum).

For

50

to

75

ft,

use

no.

16

AWG

insulated

wire

(35

C

minimum).

For

over

75

ft,

use

14

AWG

insulated

wire

(35

C

minimum).

NOTE:

Operation

of

unit

on

improper

line

voltage

con¬

stitutes

abuse

and

could

affect

Carrier

warranty

See

Table

3.

Do

not

install

unit

in

system

where

voltage

may

fluctuate

above

or

below

permissible

limits.

See

Table

3

for

recommended

fuse

sizes.

When

making

electrical

connections,

provide

clearance

at

unit

for

refrig¬

erant

piping

connections

Use

furnace

oi

fan

coil

transformer

as

24-v

(40-va

minimum)

supply

for

system

as

shown

in

Fig.

7

or

use

accessory

transformer.

A

WARNING

To

avoid

personal

injury,

be

sure

indoor

blower

has

stopped

before

attempting

service

or

maintenance.

Operating

voltage

to

compressor

must

be

within

voltage

range

indicated

on

unit

nameplate.

On

3-phase

units

voltages

between

phases

must

be

balanced

within

2%

U

se

the

following

formula

to

determine

the

%

voltage

imbalance.

%

Voltage

Imbalance

^

max

voltage

deviation

frqm

average

voltage

~~

average

voltage

6

Table

3

—

Electrical

Data

(60

Hz)

OUTDOOR

i

imit

ooun

V/PH

OPER

VOLTS*

COMPR

FAN

Cl

A

MCA

MAX

FUSE

OR

HACR

TYPE

UNI

I

oonu

Max

Min

LRA

RLA

rLM

CKT

BKR

AMPS

018

52

0

84

.70

120

15

024

60.0

10.6

70

140

20

030

036

208/230-1

254

187

65

0

82

0

13.5

16

5

70

1

45

180

22

0

30

35

048

127

0

25

0

1

45

33

0

50

060

135

0

30.7

1.45

40

0

60

036

67

5

10.0

1

45

140

20

048

208/230-3

254

187

98

5

15

4

1.45

21

0

35

060

105.0

19.6

1.45

26

0

45

036

33

8

50

80

70

15

048

460-3

506

414

49

3

77

80

11

0

15

060

55

0

104

.80

14.0

20

FLA

—

Full

Load

Amps

HACR

—

Heating,

Air

Conditioning,

Refrigeration

LRA

—

Locked

Rotor

Amps

MCA

—

Minimum

Circuit

Amps

per

NEC

Section

430-24

RLA

—

Rated

Load

Amps

(compressor)

*Permissible

limits

of

the

voltage

range

at

which

unit

will

operate

satisfactorily

NOTE:

Control

circuit

is

24v

on

all

units

and

requires

external

power

source

Example:

Supply

voltage

is

460-3-60.

START-UP

AB

=

452

volts

BC

=

464

volts

AC

-

455

volts

Average

Voltage

=

452

+

464

+

455

3

1371

3

=

457

Determine

maximum

deviation

from

average

voltage

(AB)

457

-

452

=

5

volts

(BC)

464

-

457

=

7

volts

(AC)

457

-

455

=

2

volts

Maximum

deviation

is

7

volts.

Determine

%

voltage

imbalance:

%

Voltage

Imbalance

=

100

x

—=

1.53%

This

amount

of

phase

imbalance

is

satisfactory

as

it

is

below

the

maximum

allowable

2%.

Preliminary

Checks

1

Check

that

all

internal

wiring

connections

are

tight

and

that

all

barriers,

covers

and

panels

are

in

place.

2.

Field

electrical

power

source

must

agree

with

unit

nameplate

rating

3

All

service

valves

must

be

open.

4.

Crankcase

heater

must

be

tight

on

compressor

crankcase.

Leak

Test

field

piping

and

fan

coil

by

pressure

method

described

in

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Section

1-6.

Use

R-22

at

approxi¬

mately

25

psig

backed

up

with

an

inert

gas

to

a

total

pressure

not

to

exceed

245

psig.

Before

starting

unit,

crankcase

heater

must

be

on

for

24

hours

to

be

sure

all

refrigerant

is

out

of

the

oil

.

To

energize

crankcase

heater,

proceed

as

follows:

set

space

thermostat

above

ambient

so

there

will

be

no

demand

for

cooling.

Close

field

disconnect.

The

crankcase

heater

is

now

energized.

IMPORTANT:

If

the

supply

voltage

phase

im¬

balance

is

more

than

2%

contact

your

local

electric

utility

company

immediately.

Unit

failure

as

a

result

of

operation

on

improper

line

voltage

or

excessive

phase

imbalance

constitutes

abuse

and

may

cause

damage

to

electrical

components.

Such

operation

would

invalidate

any

applicable

Carrier

warranty.

Evacuate

and

Dehydrate

field

piping

and

fan

coil

by

either

of

the

methods

described

in

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Section

1-7.

A

CAUTION

Service

valves

must

be

fully

backseated

to

close

service

port.

There

is

no

Schrader

valve

at

the

service

port

and

failure

to

backseat

the

valve

could

result

in

loss

of

system

charge

or

personal

injury.

7

A

CAUTION

Charge

System

—

Release

holding

charge

into

sys¬

tem

by

opening

(backseating)

liquid

and

suction

line

service

valves.

Add

charge

amount

as

required

for

the

total

system.

See

Table

1.

For

indoor

sections

not

in¬

cluded

in

Table

1,

see

Refrigerant

Charging.

To

Start

Unit

—

Assuring

that

crankcase

heater

has

been

on

for

24

hours,

and

field

disconnect

is

closed,

set

room

thermostat

below

ambient.

Unit

compressor

starts

after

a

5-minute

delay

if

equipped

with

optional

Time

Guard®

11.

Operate

unit

for

15

minutes,

then

check

system

refrigerant

charge.

See

Refrigerant

Charging.

SERVICE

A

CAUTION

Before

performing

recommended

maintenance,

be

sure

unit

main

power

switch

is

turned

off.

Failure

to

do

so

may

result

in

electric

shock

or

injury

from

rotating

fan

blade.

Condenser

Fan

is

held

by

a

reinforced

wire

mount

which

clamps

the

fan

motor

in

position.

See

Fig.

8

for

proper

mounted

fan

position.

OUTSIDE

EDGE

OF

FAN

DECK

qo

B.a.anQQ

qqqqo

OUTSIDE

EDGE

OF

GRILLE

^^FAN

BLADE

1

I

DIMENSION

FROM

OUTSIDE

TOP

EDGE

OF

BLADE

TO

OUTSIDE

EDGE

OF

FAN

DECK

SEE

CHART

BELOW

UNIT

SIZE

38HD018

38HD024,030

38HD036,048,060

433"

(11

mm)

709"

(18

mm)

16"

(4

mm)

Fig.

8

—

Mounted

Fan

Positions

High

Pressure

Relief

Valve

is

located

in

com¬

pressor.

Relief

valve

opens

at

a

pressure

differential

of

approximately

450

±

50

psig

between

suction

(low

side)

and

discharge

(high

side)

to

allow

pressure

equalization.

Internal

Current

and

Temperature

Sensitive

Overload

resets

automatically

when

internal

com¬

pressor

motor

temperature

drops

to

a

safe

level

(over¬

loads

may

require

up

to

45

minutes

to

reset)

When

an

internal

overload

is

suspected

of

being

open,

check

by

using

an

ohmmeter

or

continuity

tester.

If

necessary,

refer

to

Carrier

Standard

System

Techniques

Manual,

Chapter

2,

for

complete

information.

Pumpdown

Procedure

—

The

system

may

be

pumped

down

in

order

to

make

repairs

on

low

side

with¬

out

losing

complete

refrigerant

charge.

1.

Attach

pressure

gage

to

suction

service

valve

gage

port.

2.

Frontseat

the

liquid

line

valve.

3.

Start

unit

and

run

until

suction

pressure

reaches

5

psig

(see

Caution).

4.

Shut

unit

off

and

frontseat

suction

valve.

5.

Vent

remaining

pressure.

38HD

unit

coils

hold

only

the

factory

designated

amount

of

refrigerant.

Additional

refrigerant

may

cause

units

to

relieve

pressure

through

internal

pressure

relief

valve

(indicated

by

a

sudden

rise

of

suction

pressure)

before

suction

pressure

reaches

5

psig.

If

this

occurs,

shut

off

unit

immediately,

frontseat

suction

valve

and

vent

remaining

pressure.

Filter

Drier

—

Whenever

the

moisture-liquid

indicator

shows

presence

of

moisture,

replace

filter

drier.

Refer

to

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

Refrigerants,

for

details

on

servicing

filter

driers.

High

-Pressure

Switch

—

This

switch,

located

on

discharge

line,

protects

against

high

discharge

pressures

caused

by

such

events

as

overcharge,

condenser

fan

motor

failure,

system

restriction,

etc.

It

opens

on

pressure

rise

at

about

426

psi.

If

system

pressures

go

above

this

setting

during

abnormal

conditions,

switch

opens.

Do

not

attempt

to

simulate

these

system

abnormalities,

as

high

pressures

pose

a

serious

safety

hazard.

High-pressure

switch

is

also

checked

with

an

ohmmeter

similar

to

check¬

ing

low-pressure

switch.

If

system

pressure

is

below

426

psi,

switch

shows

continuity.

It

is

replaced

in

same

manner

as

low-pressure

switch.

Observe

all

safety

precautions.

Low-Pressure

Switch

—

This

switch,

mounted

on

the

suction

line,

has

fixed

nonadjustable

settings.

TO

CHECK

—

Attach

pressure

gage

to

suction

service

valve

gage

port.

Slowly

close

liquid

shutoff

valve

and

allow

compressor

to

pump

down.

Do

not

allow

com¬

pressor

to

pump

down

below

2

psig

(13.8

kPa).

Com¬

pressor

should

shut

down

when

suction

pressure

drops

to

cutout

pressure

in

Table

2,

and

should

restart

when

pressure

builds

up

to

cut-in

pressure

shown

after

CLO

(Compressor

Lockout)

has

been

reset

and

optional

Time

Guard

has

completed

its

timing

cycle.

Crankcase

Heater

prevents

refrigerant

migration

and

compressor

oil

dilution

during

shutdown

when

com¬

pressor

is

not

operating.

If

crankcase

heater

is

de¬

energized

for

more

than

6

hours,

both

compressor

service

valves

must

be

closed.

Crankcase

heaters

come

in

2

basic

types:

wraparound

(bellyband)

type

that

is

wrapped

externally

around

com¬

pressor

shell,

and

insertion

type

that

is

inserted

into

compressor

oil

well

in

shell

of

compressor.

Both

types

are

in

this

family

of

units.

Crankcase

heater

is

powered

by

high-voltage

power

of

unit.

It

is

connected

across

the

line

side

of

the

contactor

and

operates

continually.

Use

extreme

caution

trouble¬

shooting

this

device

with

power

on.

Easiest

method

of

troubleshooting

is

to

apply

voltmeter

across

crankcase

heater

leads

to

see

if

heater

voltage

is

on.

Do

not

touch

heater.

Carefully

feel

area

around

crankcase

heater.

If

warm,

crankcase

heater

is

probably

functioning.

With

power

off,

and

heater

leads

disconnected,

check

across

leads

with

ohmmeter.

Do

not

look

for

a

specific

resistance

reading.

Check

for

resistance

or

an

open

circuit.

Change

heater

if

an

open

circuit

is

detected.

Service

Valves

—

The

service

valves

in

the

condensing

unit

come

from

the

factory

frontseated

This

means

the

refrigerant

charge

is

isolated

from

the

line

set

connec¬

tion

ports.

To

prevent

damage

to

the

valve,

use

a

wet

cloth

or

other

accepted

heat

sink

material

on

the

valve

before

brazing.

The

service

valves

must

be

backseated

(turned

counter¬

clockwise

until

seated)

before

the

service

port

caps

can

be

removed

and

hoses

of

gage

manifold

connected.

In

this

position,

refrigerant

has

access

from

and

through

outdoor

and

indoor

unit.

The

service

valve

cannot

be

8

field

repaired,

therefore

only

a

complete

valve

or

valve

stem

and

service

port

caps

are

available

for

replacement.

AccuRater®

(Bypass

Type)

Servicing

—

See

Fig.

4

for

bypass

type

AccuRater

components.

The

piston

has

a

refrigerant

metering

hole

through

it.

The

retainer

forms

a

stop

for

the

piston

in

the

refrigerant

bypass

mode,

and

a

sealing

surface

for

liquid

line

flare

connection.

To

check,

clean

or

replace

piston:

1.

Shut

off

power

to

unit.

2.

Pump

unit

down

using

Pumpdown

Procedure

described

previously.

3.

Remove

liquid

line

flare

connection

from

AccuRater.

4.

Pull

retainer

out

of

body,

being

careful

not

to

scratch

flare

sealing

surface.

If

retainer

does

not

pull

out

easily,

carefully

use

locking

pliers

to

remove

retainer.

5.

Slide

piston

out

by

inserting

a

small

soft

wire,

with

small

kinks,

through

metering

hole.

Ensure

metering

hole,

sealing

surface

around

piston

cones

and

fluted

portion

of

piston

are

not

damaged.

6.

Clean

piston

refrigerant

metering

hole.

7.

Replace

retainer

O-ring

before

reassembling

bypass

type

AccuRater.

Carrier

O-ring

part

number

is

99CC501052.

Refrigerant

Charging

A

CAUTION

To

prevent

personal

injury,

wear

safety

glasses

and

gloves

when

handling

refrigerant.

Do

not

overcharge

system.

This

can

cause

compressor

flooding.

A

CAUTION

Service

valves

must

be

fully

backseated

to

close

service

port.

There

is

no

Schrader

valve

at

the

service

port

and

failure

to

backseat

the

valve

could

result

in

loss

of

system

charge

or

personal

injury.

To

check

and

adjust

charge

during

cooling

season,

use

Tables

4

and

5

and

the

following

procedure:

1.

Operate

unit

a

minimum

of

15

minutes

before

check¬

ing

charge.

2.

Measure

suction

pressure

by

attaching

a

gage

to

suction

valve

service

port.

3.

Measure

suction

line

temperature

by

attaching

a

service

thermometer

to

unit

suction

line

near

suction

valve.

Insulate

thermometer

for

accurate

readings.

4.

Measure

outdoor

coil

inlet

air

dry-bulb

temperature

with

a

second

thermometer.

5.

Measure

indoor

coil

inlet

air

wet-bulb

temperature

with

a

sling

psychrometer.

6.

Refer

to

Table

4.

Find

air

temperature

entering

outdoor

coil

and

wet-bulb

temperature

entering

indoor

coil.

At

this

intersection

note

the

superheat.

7.

Refer

to

Table

5.

Find

superheat

temperature

and

suction

pressure,

note

suction

line

temperature.

8.

If

unit

has

higher

suction

line

temperature

than

charted

temperature,

add

refrigerant

until

charted

temperature

is

reached.

9.

If

unit

has

lower

suction

line

temperature

than

charted

temperature,

bleed

refrigerant

until

charted

temperature

is

reached.

10.

If

air

temperature

entering

outdoor

coil

or

pressure

at

suction

valve

changes,

charge

to

new

suction

line

temperature

indicated

on

chart.

11.

This

procedure

is

valid,

independent

of

indoor

air

quantity.

Table

4

—

Superheat

Charging

Table

(Superheat

Entering

Suction

Service

Valve)

OUTDOOR

TEMP

(F)

50

INDOOR

COIL

ENTERING

AIR

(F)

WB

52

54

56

58

60

62

64

66

168

70

n

74

76

55

12

14

17

20

23

26

29

32

35

37

40

42

W5

60

10

12

15

18

21

24

27

;30

63

135

138

40

43

65

10

13

16

19

21

24

27

30

33

m

38

41

70

10

13

16

19

21

24

27

30

p3

36

69

75

12

15

18

21

24

28

K31

34

37

80

12

15

18

21

25

28

31

35

85

11

15

19

22

66

30

33

90

13

16

20

£4

27

31

95

10

14

18

£2

25

29

100

12

15

60

23

27

105

13

17

22

26

110

11

15

20

25

115

14

|18

23

—

Do

not

attempt

to

charge

system

under

these

conditions

or

refrigerant

slugging

may

occur

Table

5

—

Required

Suction-Tube

Temperature

(F)

(Entering

Suction

Service

Valve)

SUPERHEAT

SUCTION

PRESSURE

AT

SERVICE

PORT

(psig)

TEMP

(F)

61.5

64.2

67.1

o

o

73.0

76.0

~>i

CO

ro

82.4

85.7

0

35

37

39

41

43

45

47

49

51

2

37

39

41

43

45

47

49

51

53

4

39

41

43

45

47

49

51

53

55

6

41

43

45

47

49

51

53

55

57

8

43

45

47

49

51

53

55

57

59

10

45

47

49

51

53

55

57

59

61

12

47

49

51

53

55

57

59

61

63

14

49

51

53

55

57

59

61

63

65

16

51

53

55

57

59

61

63

65

67

18

53

55

57

59

61

63

~65^

67

69

20

55

57

59

61

63

65

67

69

71

22

57

59

61

63

65

67

69

71

73

24

59

61

63

65

67

69

71

73

75

26

61

63

65

67

69

71

73

75

77

28

63

65

67

69

71

73

IE

77

79

30

65

67

69

71

73

75

79

_81_

32

67

69

71

73

75

77

79

81

83

34

69

71

73

75

77

79

81

83

85

36

71

73

75

77

79

81

83

85

87

38

73

75

77

79

81

83

85

87

89

40

75

77

79

81

83

85

87

89

91

Time

Guard®

II

Device

—

Accessory

Time

Guard

II

device

is

shipped

in

6-pack

units.

Apply

it

to

Carrier

38HD

units

to

protect

the

unit

compressor

from

short

cycling.

See

Fig.

9.

The

device

prevents

short

cycling

by

providing

a

5-minute

delay

(

±

2

minutes)

before

restart¬

ing

a

compressor

after

shutdown

for

any

reason.

On

normal

start-up,

the

5-minute

delay

occurs

before

the

thermostat

closes.

After

the

thermostat

closes,

the

Time

Guard

II

device

then

has

a

3-second

delay

prior

to

contactor

closure.

INSTALLATION

—

Install

the

Time

Guard

II

device

in

the

24-v

control

circuit,

locating

it

in

the

space

provided

at

the

front

of

the

control

box,

using

the

screws

provided.

9

MAINTENANCE

BLK

DENOTES

CLOSED

CONTACTS

Fig.

9

—

Time

Guard

II

Sequence

Chart

TIME

GUARDH

—vio—

Tl

T3

T2

1

YEL

COMPRESSOR

LOCKOUT

XD

Cj>

<D--blu-

<D

d

Lbrn-

BLK-

BRN^r

COMMON

TO

THERMOSTAT

Fig.

10

—

Wiring

Diagram

See

Fig.

10.

Wire

the

device

in

series

between

the

compressor

lockout

(CLO)

and

the

unit

thermostat

as

shown

on

unit

wiring

diagram.

A

CAUTION

Before

performing

recommended

maintenance,

be

sure

unit

main

power

switch

is

turned

off.

Failure

to

do

so

may

result

in

electric

shock

or

injury

from

rotating

fan

blade.

Lubrication

COMPRESSOR

contains

factory

oil

charge.

Replace

oil

when

lost.

See

Table

2

for

oil

recharge

and

refer

to

Carrier

Standard

Service

Techniques

Manual,

Chapter

1,

page

1-21,

for

oil

recharging

procedure.

Use

Carrier

PP33-1,

Texaco

WF-32

or

Suniso

3GS

oil.

FAN

MOTOR

BEARINGS

—

Oiling

holes

are

provided

at

each

end

of

condenser

fan

motor.

Remove

fan

motor

and

lubricate

motor

with

32

drops

(16

drops

per

hole)

of

SAE-10

nondetergent

oil

at

intervals

described

below:

a.

Annually,

when

environment

is

very

dirty,

ambient

temperature

is

higher

than

105

F

and

average

unit

operating

time

exceeds

15

hours

a

day

b.

Every

3

years

when

environment

is

reasonably

clean,

ambient

temperature

is

less

than

105

F

and

unit

operating

time

averages

8

to

15

hours

a

day.

c.

Every

5

years

when

environment

is

clean,

ambient

temperature

is

less

than

105

F

and

unit

operating

time

averages

less

than

8

hours

a

day.

Cleaning

Coils

—

Coils

should

be

washed

out

with

water,

or

blown

out

with

compressed

air.

The

blow-thru

design

causes

dirt

and

debris

to

build

up

on

the

inside

of

the

coils.

Remove

the

wire

from

terminal

2

on

the

compressor

lockout

and

connect

the

violet

wire

from

T2

on

the

Time

Guard

II

device

to

terminal

2

on

the

compressor

lockout.

Connect

the

wire

removed

from

terminal

2

on

the

com¬

pressor

lockout

to

yellow

wire

T1

on

the

Time

Guard

II

device.

Connect

black

wire

T3

on

Time

Guard

II

device

to

common.

Compressor

Lockout

—

Units

with

compressor

lockout

protective

device

shut

down

on

any

safety

trip.

Determine

reason

for

safety

trip.

To

restart,

turn

the

thermostat

to

OFF

and

then

to

COOL.

Clean

coil

annually

or

as

required

by

location

or

outdoor

air

conditions.

Inspect

coil

monthly,

and

clean

as

required.

Fins

are

not

continuous

through

coil

sections.

Dirt

and

debris

may

pass

through

first

section,

become

trapped

between

the

row

of

fins

and

restrict

condenser

airflow.

Use

a

flashlight

to

determine

if

dirt

or

debris

has

collected

between

coil

sections.

Clean

coil

as

follows:

1.

Turn

off

unit

power.

2.

Using

a

water

hose,

or

other

suitable

equipment,

flush

coil

from

the

outside

to

remove

dirt

Be

sure

to

flush

all

dirt

and

debris

from

drain

holes

in

base

of

unit.

Fan

motors

are

waterproof.

10