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HEATING

&

COOLING

50HJ015,024

Single-Package

Rooftop

Units

Electric

Cooling

with

Electric

Heat

Option

Installation,

Start-Up

and

Service

Instructions

CONTENTS

Page

SAFETY

CONSIDERATIONS

.

1

INSTALLATION

.

1-9

Step

1

—

Provide

Unit

Support.

1

•

ROOF

CURB

•

ALTERNATE

UNIT

SUPPORT

Step

2

—

Rig

and

Place

Unit

.

1

•

POSITIONING

•

ROOF

MOUNT

Step

3

—

Field

Fabricate

Ductwork

.

6

Step

4

—

Make

Unit

Duct

Connections

....

6

Step

5

—

Trap

Condensate

Drain.

6

Step

6

—

Make

Electrical

Connections

.

7

•

FIELD

POWER

SUPPLY

•

FIELD

CONTROL

WIRING

Step

7

—

Make

Outdoor-Air

Inlet

Adjustments.

8

•

MANUAL

OUTDOOR-AIR

DAMPER

•

OPTIONAL

FACTORY-INSTALLED

ECONOMIZER

Step

8

—

Install

Outdoor-Air

Hood

.

8

START-UP.

10-12

SERVICE

.12-16

START-UP

CHECKLIST.

C

L-l

SAFETY

CONSIDERATIONS

Installation

and

servicing

of

air-conditioning

equipment

can

be

hazardous

due

to

system

pressure

and

electrical

com¬

ponents.

Only

trained

and

qualified

service

personnel

should

install,

repair,

or

service

air-conditioning

equipment.

Untrained

personnel

can

perform

basic

maintenance

func¬

tions

of

cleaning

coils

and

filters

and

replacing

filters.

All

other

operations

should

be

performed

by

trained

service

personnel.

When

working

on

air-conditioning

equipment,

observe

precautions

in

the

literature,

tags

and

labels

at¬

tached

to

the

unit,

and

other

safety

precautions

that

may

apply.

Follow

all

safety

codes.

Wear

safety

glasses

and

work

gloves.

Use

quenching

cloth

for

unbrazing

operations.

Have

fire

extinguishers

available

for

all

brazing

operations.

A

WARNING

Before

performing

service

or

maintenance

operations

on

unit,

turn

off

main

power

switch

to

unit.

Electrical

shock

could

cause

personal

injury.

INSTALLATION

Step

1

—

Provide

Unit

Support

ROOF

CURB

—

Assemble

and

install

accessory

roof

curb

in

accordance

with

instructions

shipped

with

the

curb.

Accessory

roof

curb

and

information

required

to

field

fabricate

a

roof

curb

are

shown

in

Fig

1

and

2.

Install

in¬

sulation,

cant

strips,

roofing,

and

counter

flashing

as

shown.

Ductwork

can

be

secured

to

roof

curb

before

unit

is

set

in

place.

IMPORTANT

-

The

gasketing

of

the

unit

to

the

roof

curb

is

critical

for

watertightness

Install

gasket

sup¬

plied

with

the

roof

curb

as

shown

in

Fig.

1.

Improp¬

erly

applied

gasket

can

result

in

air

leaks

and

poor

unit

performance.

Curb

should

be

level.

This

is

necessary

to

permit

unit

drain

to

function

properly

Unit

leveling

tolerance

is

±

Vi6

in.

per

linear

ft

in

any

direction.

Refer

to

Accessory

Roof

Curb

Installation

Instructions

for

additional

informa¬

tion

as

required.

ALTERNATE

UNIT

SUPPORT

-

When

the

curb

cannot

be

used,

support

unit

with

sleepers

using

unit

curb

support

area.

If

sleepers

cannot

be

used,

support

long

sides

of

unit

with

a

minimum

of

3

equally

spaced

4-in.

x

4-in.

pads

on

each

side.

Step

2

—

Rig

and

Place

Unit

—

Inspect

unit

for

transportation

damage.

File

any

claim

with

transportation

agency.

Keep

unit

upright,

and

do

not

drop.

Use

spreader

bars

over

unit

to

prevent

sling

or

cable

damage.

Rollers

may

be

used

to

move

unit

across

a

roof.

Level

by

using

unit

frame

as

a

reference;

leveling

tolerance

is

±

Vi6

in.

per

lin¬

ear

ft

in

any

direction.

See

Fig.

1

for

additional

leveling

tolerance

information.

Unit

weight

is

shown

in

Table

1.

Four

lifting

holes

are

provided

in

ends

of

unit

base

rails

as

shown

in

Fig.

3

Refer

to

rigging

instructions

on

unit.

POSITIONING

—

Provide

clearance

around

and

above

unit

for

airflow,

safety,

and

service

access

(Fig.

4).

Do

not

install

unit

in

an

indoor

location.

Do

not

locate

air

inlets

near

exhaust

vents

or

other

sources

of

contam¬

inated

air.

Although

unit

is

weatherproof,

guard

against

water

from

higher

level

runoff

and

overhangs.

ROOF

MOUNT

—

Check

building

codes

for

weight

dis¬

tribution

requirements.

Manufacturer

reserves

the

right

to

discontinue,

or

change

at

any

time,

specifications

or

designs

without

notice

and

without

incurring

obligations.

Book

1

Tab

1b

PC

111

Catalog

No

565-125

Printed

in

U

S

A.

Form

50HJ-6SI

Pg

1

12-93

Replaces:

New

ACCESSORY

PACKAGE

NO.

CURB

HEIGHT

DESCRIPTION

50PQ900221

1'-2"

(305)

Standard

Curb

—

14"

High

2'-0"

(610)

Standard

Curb

50PQ900141

for

Units

Requiring

High

Installation

50PQ900151

2'-0"

(610)

Horizontal

Supply

and

Return

Curb

LEGEND

COMP

SECT.

—

Compressor

Section

NOTES:

1

Roof

curb

accessory

is

shipped

unassembled.

2.

Insulated

panels,

1-in

thick

neoprene-coated,

1

V

2

lb

density.

3

Dimensions

in

(

)

are

in

millimeters.

4

Direction

of

airflow.

5

Roof

curb

16

gage

steel.

Fig.

1

—

Roof

Curb

Details

2

EVAPORATOR-

EVAPORATOR-

FAN

MOTOR

FAN

MOTOR

Fig.

2

-

Horizontal

Supply/Return

Curb

Details

DIMENSION

A

UNIT

50HJ

Ft-in.

mm

015

3-0

914

024

3-4

Vfe

1029

NOTES:

1.

Dimensions

in

(

)

are

in

millimeters

2

Refer

to

Table

1

for

unit

operating

weights.

3.

Remove

boards

at

ends

of

unit

and

runners

prior

to

rigging.

4

Rig

by

inserting

hooks

into

unit

base

rails

as

shown.

Use

corner

post

from

packaging

to

protect

coil

from

damage.

Use

bumper

boards

for

spreader

bars.

5

Weights

do

not

include

optional

economizer

See

Table

1

for

econo¬

mizer

weight.

6.

Weights

given

are

for

aluminum

evaporator

coil

plate

fins

and

copper

condenser

coil

plate

fins

Weights

of

other

metal

combi¬

nations

are

listed

in

Table

1

A

CAUTION

All

panels

must

be

in

place

when

rigging.

Fig.

3

-

Rigging

Details

3

CONTROL

80X

ACCE55

f

(8?)

25%

AIR

OR

ECONOMIZER

HOOD

U

FIELD--

SUPPLIED

u

1

O'

-3"

(76)

3

7/16*

SECTION

A-A

0

-3

7/8

(99)

II

INDOOR

COIL

ALTERNATE

RETURN

3/4"

FPT

ORA

IN

CONNECTION

(27)

FAR

5IDE

ONLY

DIMENSIONS

-3*

8

7/8'DIA

CONCENTRIC

<

0

(76)

£

(22)

(FIELD

POWER)

UNIT

A

B

C

50HJ

Ft-in.

mm

Ft-in.

mm

Ft-in.

mm

015

3-0

914

2-9

838

1-10

559

024

3-4%

1035

3-7

1092

1-8

508

LEGEND

KO

—

Knockout

NOTES:

1

CORNER

WEIGHT*

UNIT

50HJ

A

1_

B

_1

C

j

D

Lb

Kg

Lb

Kg

Lb

Kg

Lb

Kg

015

390

177

243

110

322

146

515

234

024

492

1

233

511

232

504

229

523

237

‘Weights

are

for

unit

only

(with

aluminum

evaporator

and

condenser

coil

fins)

and

do

not

include

options

or

crating

Dimensions

in

(

)

are

in

millimeters

2

®

Center

of

gravity.

3<=>

Direction

of

airflow.

4

Ductwork

to

be

attached

to

accessory

roof

curb

only.

5.

Minimum

clearance:

a

Rear:

7'-0"

(2134)

for

coil

removal.

This

dimension

can

be

reduced

to

4'-0”

(1219)

if

conditions

permit

coil

removal

from

the

top

b

Left

side:

4'-0"

(1219)

for

proper

condenser

coil

airflow

c

Front

1

4'-0"

(1219)

for

control

box

access

d.

Right

side:

4'-0"

(1219)

for

proper

operation

of

damper

and

power

exhaust

(if

so

equipped).

e.

Top:

6'-0"

(1829)

to

assure

proper

condenser

fan

operation.

f.

Local

codes

or

jurisdiction

may

prevail.

6.

With

the

exception

of

clearance

for

the

condenser

coil

and

the

damper/power

exhaust

as

stated

in

note

no

5,

a

removable

fence

or

barricade

requires

no

clearance

Dimensions

are

from

outside

of

corner

post.

Allow

0'-

5

/ie"

(8)

on

each

side

for

top

cover

drip

edge

7.

Fig.

4

—

Base

Unit

Dimensions

4

Table

1

—

Physical

Data

UNIT

SIZE

50HJ

OPERATING

WT

(lb)

AI/AI*

Unit

Al/Cu*

Cu/Cu*

Economizer

Roof

Curbt

COMPRESSOR

Number

Oil

(oz)152

2030

2160

2270

110

200

REFRIGERANT

Charge

(lb)**

Sys

1,

Sys

2

20

.

8

,

-

R-22

16.25,

16.25

REFRIGERANT

METERING

DEVICE

Upper

Circuit

No.

...Length

(in.)...lD/OD

Lower

Circuit

No.

...Length

(in.)...ID/OD

Capillary

Tubes

.25...0

055/0.125

25...0

055/0.125

.25...0

055/0.125

13.

25

.0.055/0.125

13...25..

0.055/0

125

CONDENSER

COIL

Rows

Fins/in.

Total

Face

Area

(sq

ft)

Copper

Tubes,

Aluminum

or

Copper

Plate

Fins

13

6

Al

or

12.4

Cu

18.9

13.6

Al

or

12.4

Cu

22

2

CONDENSER

FAN

Nominal

Cfm

Number...Diameter

(in.)

Motor

Hp

(1075

Rpm)

Watts

Input

(Total)

12,000

2...26

1

2672

Propeller

Type,

Direct

Drive

11,400

2

.26

1

3000

EVAPORATOR

COIL

Rows

Fins/in.

Total

Face

Area

(sq

ft)

Copper

Tubes,

Aluminum

or

Copper

Plate

Fins

14.3

Al

or

13.1

Cu

16

5

14.4

Al

or

13.1

Cu

17.9

EVAPORATOR

FAN

Quantity...Size

(in.)

Nominal

Cfm

Maximum

Allowable

Rpm

Motor

Pulley

Pitch

Diameter

(in.)

Fan

Pulley

Pitch

Diameter

(in.)

Belt,

Quantity...Type...Length

(in.)

Factory

Speed

Setting

(Rpm)

Motor

Hp

(Service

Factor)

Motor

Frame

Size

2..

10

x

10

5000

1550

3

4-4.4

6.0

1

.V...41

1092

3

(1.15)

56

Centrifugal,

Fixed

Pitch

Belt

Drive

2...12

x

12

8000

1500

6.10

8.40

1.

BX,.

51

1287

7V2

(1.15)

184T

HIGH-PRESSURE

SWITCH

Cutout

(psig)

Reset

(psig)_

426

320

LOW-PRESSURE

SWITCH

Cutout

(psig)

Reset

(psig)

7

22

AIR

INLET

SCREENS

Economizer,

Quantity...Size

(in.)

20

x

25

x

1

20

x

20

x

1

RETURN-AIR

FILTERS

(TYPE)

Quantity...

Size

(in.)

10%

Efficient

2..

.

20

x

20

x

2

3..

.

1

6

x

20

x

2

2..

.

1

6

x

25

x

2

2-in

Throwaway

Fiberglass

4..

20

x

20

x

2

4..

16

x

20

x

2

LEGEND

Al

—

Aluminum

Cu

—

Copper

*Evaporator

coil

fin

material/condenser

coil

fin

material.

tWeight

of

14

in.

roof

curb.

**System

1

consists

of

the

upper

portion

of

condenser

coil

and

intertwined

evaporator

coil,

and

System

2

consists

of

the

lower

portion

of

the

condenser

coil

and

intertwined

evaporator

coil

NOTE:

The

50HJ015

has

adjustable

pulleys

The

50HJ024

has

one

set

(2)

of

fixed

pulleys

5

Step

3

—

Field

Fabricate

Ductwork

—

Secure

all

ducts

to

building

structure.

Use

flexible

duct

connectors

be¬

tween

unit

and

ducts

as

required.

Insulate

and

weatherproof

all

external

ductwork,

joints,

and

roof

openings

with

counter

flashing

and

mastic

in

accordance

with

applicable

codes.

Ducts

passing

through

an

unconditioned

space

must

be

insulated

and

covered

with

a

vapor

barrier.

The

50HJ

units

with

electric

heat

require

a

1-in.

clear¬

ance

for

the

first

24

in.

of

ductwork.

Outlet

grilles

must

not

lie

directly

below

unit

discharge.

Step

4

—

Make

Unit

Duct

Connections

-

Unit

is

shipped

for

through-the-bottom

duct

connections.

Duct¬

work

openings

are

shown

in

Fig.

5.

Field-fabricated

con¬

centric

ductwork

may

be

connected

as

shown

in

Fig.

6

and

7.

Attach

all

ductwork

to

roof

curb

and

roof

curb

basepans.

Refer

to

installation

instructions

shipped

with

accessory

roof

curb

for

more

information.

Step

5

—

Trap

Condensate

Drain

—

See

Fig.

4

and

8

for

drain

location.

Plug

is

provided

in

drain

hole

and

must

be

removed

when

unit

is

operating.

One

3

/4-in.

half

NOTE.

Do

not

drill

in

this

area,

as

damage

to

basepan

may

result

in

water

leak.

Fig.

5

—

Air

Distribution

—

Through-the-Bottom

(50HJ024

Shown)

NOTE:

Do

not

drill

in

this

area,

as

damage

to

basepan

may

result

in

water

leak.

Fig.

6

-

Concentric

Duct

Air

Distribution

(50HJ024

Shown)

coupling

is

provided

inside

unit

evaporator

section

for

con¬

densate

drain

connection.

An

8Vi

in

x

3

A-in.

diameter

nip¬

ple

and

a

2-in.

x

3

/4-in.

diameter

pipe

nipple

are

coupled

to

standard

3

/4-in.

diameter

elbows

to

provide

a

straight

path

down

through

holes

in

unit

base

rails

(see

Fig.

9).

A

trap

at

least

4-in.

deep

must

be

used.

Shaded

area

indicates

block-off

panels.

NOTE

^Dimensions

A,

A'

and

B,

B'

are

obtained

from

field-supplied

ceiling

diffuser

Fig.

7

-

Concentric

Duct

Details

Fig.

9

—

Condensate

Drain

Piping

Details

6

Step

6

—

Make

Electrical

Connections

FIELD

POWER

SUPPLY

—

Unit

is

factory

wired

for

volt¬

age

shown

on

nameplate.

When

installing

units,

provide

a

disconnect,

per

NEC

(National

Electrical

Code)

requirements,

of

adequate

size

(Table

2).

All

field

wiring

must

comply

with

NEC

and

local

requirements.

Route

power

lines

through

control

box

access

panel

or

unit

basepan

(Fig.

4)

to

connections

as

shown

on

unit

wir¬

ing

diagram

and

Fig.

10.

Transformer

no.

1

is

wired

for

230-v

unit.

If

208/230-v

unit

is

to

be

run

with

208-v

power

supply,

the

transformer

must

be

rewired

as

follows:

1.

Remove

cap

from

red

(208

v)

wire.

2.

Remove

cap

from

orange

(230

v)

spliced

wire.

3.

Replace

orange

wire

with

red

wire

4.

Recap

both

wires.

TB1

MAXIMUM

WIRE

SIZE

UNIT

50HJ

VOLTAGE

208/230

460

575

015

350

kcmil

2/0

2/0

024

350

kcmil

2/0

2/0

IMPORTANT:

BE

CERTAIN

UNUSED

WIRES

ARE

CAPPED.

Failure

to

do

so

may

damage

the

transformers.

Operating

voltage

to

compressor

must

be

within

voltage

range

indicated

on

unit

nameplate.

On

3-phase

units,

volt¬

ages

between

phases

must

be

balanced

within

2%

and

the

current

must

be

balanced

within

10%.

Use

the

following

formula

to

determine

the

percentage

of

voltage

imbalance.

Percentage

of

Voltage

Imbalance

,

^

max

voltage

deviation

from

average

voltage

-

100

x

-

2

i

2

average

voltage

Example:

Supply

voltage

is

460-3-60.

AB

=452

v

BC

=464

v

AC

=455

v

Average

Voltage

452

+464

+455

3

1371

~

3

=

457

Determine

maximum

deviation

from

average

voltage.

(AB)

457

-452

=5

v

(BC)

464

-457

=7

v

(AC)

457

-455

=2

v

Maximum

deviation

is

7

v.

Determine

the

percentage

of

voltage

imbalance:

7

Percentage

of

Voltage

Imbalance

=

100

x

-

LEGEND

EQUIP

—

Equipment

GND

—

Ground

kcmil

—

Thousand

Circular

Mils

NEC

—

National

Electrical

Code

TB

—

Terminal

Block

Fig.

10

—

Field

Power

Wiring

Connections

FIELD

CONTROL

WIRING

-

Install

a

Carrier-approved

accessory

thermostat

assembly

according

to

the

installation

instructions

included

with

the

accessory.

Locate

thermostat

assembly

on

a

solid

wall

in

the

conditioned

space

to

sense

average

temperature.

Route

thermostat

cable

or

equivalent

single

leads

of

no.

18

AWG

(American

Wire

Gage)

colored

wire

from

subbase

terminals

through

conduit

in

unit

to

low-voltage

connections

as

shown

on

unit

label

wiring

diagram

and

in

Fig.

11.

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

no.

14

AWG

insulated

wire

(35

C

minimum).

All

wire

larger

than

no.

18

AWG

cannot

be

directly

connected

to

the

ther¬

mostat

and

will

require

a

junction

box

and

splice

at

the

thermostat.

Set

heat

anticipator

settings

as

indicated

in

Table

3.

Set¬

tings

may

be

changed

slightly

to

provide

a

greater

degree

of

comfort

for

a

particular

installation.

Refer

to

accessory

remote

control

instructions

as

required.

=

1.53%

This

amount

of

phase

imbalance

is

satisfactory

as

it

is

below

the

maximum

allowable

2%.

IMPORTANT:

If

the

supply

voltage

phase

imbal¬

ance

is

more

than

2%,

contact

your

local

electric

util¬

ity

company

immediately.

Unit

failure

as

a

result

of

operation

on

improper

line

volt¬

age

or

excessive

phase

imbalance

constitutes

abuse

and

may

cause

damage

to

electrical

components.

THERMOSTAT

ASSEMBLY

REMOVABLE

JUMPER

[i^-RC

yi

j

Y

2

J

wi

jwi]

J"gT

[fuix

RED

33

-

Y]

(Y

2

J

WI

W2

\

8

3

1

BLK

jol

rh

rh

c

X

Fig.

11

-

Field

Control

Thermostat

Wiring

7

Table

2

—

Electrical

Data

UNIT

50HJ

V-PH-HZ

VOLTAGE

RANGE

COMPRESSOR

CONDENSER

FAN

MOTOR

EVAPORATOR

FAN

MOTOR

ACCESSORY/OPTIONAL

ELECTRIC

HEATERS*

POWER

SUPPLY

No.

1

No.

2

Min

Max

RLA

LRA

RLA

LRA

Qty

FLA

Hp

FLA

FLA

kW

MCA

MOCPf

015

208/230-3-60

187

253

49

3

191

-

-

2

77

3

105

39/

45

72/

82

117/135

14/19

26/34

42/56

88/

88

88/

88

103/116

159/148

100/100

100/100

110/125

175/175

460-3-60

414

508

22

1

86

-

-

2

33

3

48

18

39

66

15

32

55

39

39

55

72

45

45

60

80

575-3-60

518

632

179

69

-

-

2

26

3

39

37

37

32

52

35

60

024

208/230-3-60

187

253

43

9

170

43

9

170

2

54

(ea)

7%

24

2/22

0

72/

82

117/135

156/180“

26/34

42/56

56/75“

134/132

134/132

177/163

186/208“

175/175

175/175

200/175

200/225“

460-3-60

414

508

199

77

19

9

77

2

27

(ea)

7

Vs

11

0

39

66

96“

32

55

80“

62

62

80

110“

80

80

90

110“

575-3-60

518

632

159

62

159

62

2

34

(ea)

7

Vs

9

0

-

-

52

60

LEGEND

FLA

—

Full

Load

Amps

HACR

—

Heating,

Air

Conditioning

and

Refrigeration

LRA

—

Locked

Rotor

Amps

MCA

—

Minimum

Circuit

Amps

MOCP

—

Maximum

Overcurrent

Protection

NEC

—

National

Electrical

Code

RLA

—

Rated

Load

Amps

‘Heater

capacity'

(kW)

is

based

on

heater

voltage

of

208

v,

240

v,

480

v

and

575

v.

If

power

distribution

voltage

to

unit

varies

from

rated

heater

voltage,

heater

kW

will

vary

accordingly

This

is

the

maximum

size

permissible;

smaller

fuse

size

may

be

used

where

conditions

permit

tFuse

or

HACR

circuit

breaker

“Heaters

are

field

installed

only

NOTES:

1.

In

compliance

with

NEC

requirements

for

multimotor

and

combination

load

equipment

(refer

to

NEC

Articles

430

and

440),

the

overcurrent

protective

device

for

the

unit

shall

be

fuse

or

HACR

breaker

The

Canadian

units

may

be

fuse

or

circuit

breaker

2

MCA

calculation

for

units

with

electric

heaters

over

50

kW

=

(1.25

x

IFM

amps)

+

(1

00

x

heater

FLA).

Table

3

-

Heat

Anticipator

Settings

UNIT

VOLTAGES

kW

STAGE

1

STAGE

2

14/17

40

—

208/230

26/31

40

40

50HJ

42/52

66

40

15

40

—

Ol

5

460

30

40

40

51

40

66

575

37

40

.66

26/31

40

66

208/230,575-3-60

42/52

.66

40

50HJ

56/69

66

66

024

30

40

40

460-3-60

51

40

66

_73_j

66

66

Step

7

—

Make

Outdoor-Air

Inlet

Adjustments

MANUAL

OUTDOOR-AIR

DAMPER

-

All

units

(except

those

equipped

with

a

factory-installed

economizer)

have

a

manual

outdoor-air

damper

to

provide

ventilation

air.

Damper

can

be

preset

to

admit

up

to

25%

outdoor

air

into

return-air

compartment.

To

adjust,

loosen

securing

screws

and

move

damper

to

desired

setting

Then

retighten

screws

to

secure

damper

(Fig.

12).

OPTIONAL

FACTORY-INSTALLED

ECONOMIZER

Economizer

Motor

Control

Module

(Fig.

13-15)

—

Set

to

the

"D"

setting

(Fig.

14)

The

control

module

is

located

on

the

economizer

motor.

See

Fig.

13

and

15.

Damper

Vent

Position

Setting

1.

Set

fan

switch

at

ON

position

(continuous

fan

operation)

and

close

night

switch

if

used.

2.

Set

system

selector

switch

to

OFF

position.

3.

Turn

adjustment

screw

slowly

until

dampers

assume

de¬

sired

vent

position.

Do

not

manually

operate

econo¬

mizer

motor

since

damage

to

motor

will

result.

NOTE:

Refer

to

accessory

installation

instructions

in¬

cluded

with

the

field-installed

economizer

for

installation

information.

Also

see

Accessory

Field-Installed

Econo¬

mizer

Adjustment

section

on

page

10.

Step

8

—

Install

Outdoor-Air

Hood

—

The

same

type

of

factory-installed

hood

is

used

on

units

with

25%

air

ventilation

and

units

with

an

economizer.

NOTE:

The

hood

top

panel,

upper

and

lower

filter

retain¬

ers,

hood

drain

pan,

baffle

(024

only),

and

filter

support

bracket

are

secured

opposite

the

condenser

end

of

the

unit.

The

screens,

hood

side

panels,

remaining

section

of

filter

support

bracket,

seal

strip,

and

all

other

hardware

are

in

a

package

located

inside

the

return-air

filter

access

panel

(Fig.

16)

1.

Attach

seal

strip

to

upper

filter

retainer.

See

Fig.

17.

2.

Assemble

hood

top

panel

and

side

panels,

upper

filter

retainer,

and

hood

drain

pan

(Fig.

18)

3.

Secure

lower

filter

retainer

and

long

piece

of

filter

sup¬

port

bracket

to

unit.

See

Fig.

18.

Leave

screws

on

024

units

loose

4.

50HJ024

Units

Only:

Slide

baffle

behind

lower

filter

re¬

tainer

and

tighten

screws.

5.

Loosen

sheet

metal

screws

for

base

unit

top

panel

lo¬

cated

above

outdoor-air

inlet

opening.

25%

ADJUSTABLE

AIR

DAMPER

BASE

UNIT

Fig.

12

—

25%

Outdoor-Air

Section

Details

COOLING

LOCKOUT

SWITCH

ECONOMIZER

MOTOR

ECONOMIZER'

CONTROL

MODULE

FILTERS

ECONOMIZER

damper

assembly

Fig.

13

-

Economizer

Damper

Assembly

-

End

View

LED

—

Light-Emitting

Diode

Fig.

14

—

Economizer

Control

Module

Fig.

15

-

Economizer

Control

Module

Location

6

Match

notches

in

hood

top

panel

to

unit

top

panel

screws

Insert

hood

flange

between

unit

top

panel

flange

and

unit.

Tighten

screws.

7

Insert

outdoor-air

inlet

screens

and

spacer

in

channel

cre¬

ated

by

lower

filter

retainer

and

filter

support

biacket.

8.

Attach

remaining

shorter

section

section

of

filter

sup-

Fig.

18

—

Outdoor-Air

Hood

Details

9

START-UP

Use

the

following

information

and

Start-Up

Checklist

on

page

CL-1

to

check

out

unit

PRIOR

to

start-up.

Unit

Preparation

—

Check

that

unit

has

been

installed

in

accordance

with

these

installation

instructions

and

all

applicable

codes.

Compressor

Mounting

—

Loosen

compressor

hold¬

down

bolts

until

sideways

movement

of

the

washer

under

each

holddown

bolt

head

can

be

obtained.

Do

not

loosen

completely,

as

bolts

are

self-locking

and

will

main¬

tain

adjustment.

Internal

Wiring

—

Check

all

electrical

connections

in

unit

control

boxes;

tighten

as

required.

Refrigerant

Service

Ports

and

Valves

—

Each

50HJ

unit

has

2

Schrader-type

service

ports

per

circuit;

one

on

the

suction

line

and

one

on

the

liquid

line.

Be

sure

that

the

caps

on

the

ports

are

tight.

The

units

also

have

2

service

valves

per

circuit;

one

on

the

suction

line

and

one

on

the

discharge

line.

Be

sure

all

valves

are

open.

Crankcase

Heaters

—

Heaters

are

energized

as

long

as

there

is

power

to

unit.

IMPORTANT:

Unit

power

must

be

on

for

24

hours

prior

to

start-up.

Otherwise,

damage

to

compressor

may

result.

Evaporator

Fan

—

Fan

belt

and

pulleys

are

factory

in¬

stalled.

Remove

tape

from

the

fan

pulley

and

adjust

pulleys

on

50HJ015

units

as

required.

See

Evaporator-Fan

Perfor¬

mance

Adjustment

section

on

page

12.

See

Table

4

for

Air

Quantity

Limits.

See

Tables

5,

6A,

and

6B

for

Fan

Perfor¬

mance

data.

Be

sure

that

fans

rotate

in

the

proper

direction.

See

Table

7

for

Static

Pressure

Drops

for

accessories

and

options.

To

alter

fan

performance,

see

Evaporator-Fan

Per¬

formance

Adjustment

sections,

pages

12

and

13.

Table

4

—

Air

Quantity

Limits

UNIT

50HJ

MINIMUM

CFM

MAXIMUM

CFM

015

3750

6,250

024

6000

10,000

Condenser

Fans

and

Motors

—

Fans

and

motors

are

factory

set.

Refer

to

Service,

Condenser-Fan

Adjust¬

ment

section

as

required.

Return-Air

Filters

—

Check

that

correct

filters

are

installed

in

filter

tracks.

See

Table

1.

Do

not

operate

unit

without

return-air

filters.

Outdoor-Air

Inlet

Screens

—

Outdoor-air

inlet

screens

must

be

in

place

before

operating

unit.

Accessory

Field-Installed

Economizer

Adjust¬

ment

—

Remove

filter

access

panel.

Check

that

outdoor-

air

damper

is

closed

and

return-air

damper

is

open.

Economizer

operation

and

adjustment

is

described

in

Start-Up,

Base

Unit

Operation;

and

Service,

Economizer

Adjustment

sections,

respectively.

Base

Unit

Operation

COOLING,

UNITS

WITHOUT

ECONOMIZER

-

When

thermostat

calls

for

cooling,

terminals

G

and

Y1

are

ener¬

gized.

The

indoor

(evaporator)

fan

contactor

(IFC)

and

com¬

pressor

contactor

no.

1

(Cl)

are

energized

and

evaporator-

fan

motor,

compressor

no.

1

(024)

or

unloaded

compressor

(015),

and

condenser

fans

start.

The

condenser-fan

motors

run

continuously

while

unit

is

cooling.

If

the

thermostat

calls

for

a

second

stage

of

cooling

by

energizing

Y2,

compressor

contactor

no.

2

(C2)

is

energized

and

compressor

no.

2

starts

(024),

or

compressor

no.

1

runs

fully

loaded

(015).

A

freeze

protection

thermostat

(FPT)

is

located

on

the

evaporator

coil.

It

detects

frost

buildup

and

turns

off

the

compressors,

allowing

the

coil

to

clear.

Once

frost

has

melted,

the

compressors

can

be

reenergized

by

resetting

the

thermostat.

HEATING,

UNITS

WITHOUT

ECONOMIZER

(If

Acces¬

sory

or

Optional

Heater

is

Installed)

—

Upon

a

call

for

heating

through

terminal

Wl,

IFC

and

heater

contactor

no.

1

(HC1)

are

energized.

On

units

equipped

for

2

stages

of

heat,

when

additional

heat

is

needed,

HC2

is

energized

through

W2.

COOLING,

UNITS

WITH

ECONOMIZER

-

Upon

a

call

for

cooling,

when

outdoor

ambient

temperature

is

above

the

outdoor-air

temperature

control

setting,

the

evaporator

and

condenser

fans

and

compressor

energize.

The

economizer

damper

moves

to

VENT

position.

Upon

a

first-stage

call

for

cooling,

when

outdoor

ambi¬

ent

temperature

is

below

the

temperature

control

setting,

the

evaporator

fan

starts

and

economizer

damper

modulates

to

maintain

mixed-air

temperature.

The

compressor(s)

re¬

mains

off.

Upon

a

second-stage

call

for

cooling,

compressor

no

1

(024)

or

unloaded

compressor

(015)

is

energized

and

me¬

chanical

cooling

is

integrated

with

economizer

cooling

Com¬

pressor

no.

2

(024

only)

is

locked

out.

If

the

outdoor-air

temperature

is

below

50

F,

a

cooling

lockout

switch

prevents

the

compressor(s)

from

running.

When

supply-air

temperature

drops

below

a

fixed

set

point,

the

economizer

damper

modulates

to

maintain

the

temper¬

ature

at

the

fixed

set

point.

HEATING,

UNITS

WITH

ECONOMIZER

(If

Accessory

or

Optional

Heater

is

Installed)

—

The

outdoor

air

damper

stays

at

VENT

position

while

the

evaporator

fan

is

operat¬

ing

Upon

a

call

for

heating

through

terminal

Wl,

the

in¬

door

(evaporator)

fan

contactor

(IFC)

and

heater

contactor

no.

1

(HC1)

are

energized.

On

units

equipped

for

2

stages

of

heat,

when

additional

heat

is

needed,

HC2

is

energized

through

W2.

10