Carrier 50NQ Abmessungen und Installationsanleitung

Andere Handbücher für 50NQ

2

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Bryant 549B Series Abmessungen und Installationsanleitung

50NQ

Single-Package

Heat

Pumps

HEATING

A

COOLING

Installation,

Start-Up

and

Service

Instructions

CONTENTS

Page

SAFETY

CONSIDERATION.

1

INSTALLATION.1-7

Step

1—Moving

and

Setting

Unit

in

Place.4

•

ROOFTOP

INSTALLATION

•

GROUND-LEVEL

INSTALLATION

•

CLEARANCES

Step

2—

C

ondensate

Disposal.

4

Step

3—Duct

Connections.6

Step

4—Electrical

Connections.6

•

HIGH-VOLTAGE

CONNECTIONS

•

PROCEDURES

FOR

208V

•

CONTROL

VOLTAGE

CONNECTIONS

•

HEAT

ANTICIPATOR

SETTING

•

CIRCUIT

BREAKER

PREPARING

UNIT

FOR

START-UP.7

START-UP

AND

ADJUSTMENTS.9

CARE

AND

MAINTENANCE.10

NOTE

TO

INSTALLER:

Leave

these

instructions

and

the

User’s

Manual

with

the

equipment

user

after

installation.

INTRODUCTION

Model

50NQ

Packaged

Heat

Pump

Units

are

fully

self-

contained,

heating/cooling

units

designed

for

outdoor

instal¬

lation.

These

units

may

be

installed

either

on

a

rooftop

or

ground-level

slab.

For

rooftop

downflow

applications,

an

accessory

roof-mounting

curb

may

be

used.

SAFETY

CONSIDERATIONS

Installing

and

servicing

air

conditioning

equipment

can

be

hazardous

due

to

system

pressure

and

electrical

compo¬

nents.

Only

trained

and

qualified

service

personnel

should

install

or

service

air

conditioning

equipment.

Untrained

personnel

can

perform

basic

maintenance

func¬

tions

such

as

cleaning

coils

and

filters

and

replacing

filters.

All

other

operations

should

be

performed

by

trained

service

personnel.

When

working

on

air

conditioning

equipmei^,

observe

precautions

in

the

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.

Recognize

safety

information:

This

is

the

safety-alert

sym¬

bol

A,

when

you

see

this

symbol

on

the

unit

and

in

instruc¬

tions

or

manuals,

be

alert

to

the

potential

for

personal

injury.

Understand

the

signal

word—DANGER,

WARNING

or

CAUTION.

These

words

are

used

with

the

safety-alert

sym¬

bol.

DANGER

identifies

the

most

serious

hazards

which

will

result

in

severe

personal

injury

or

death.

WARNING,

on

the

other

hand

could

result

in

personal

injury

or

death.

CAUTION

is

used

to

identify

unsafe

practices,

which

would

Fig.

1—Model

50NQ

result

in

minor

personal

injury

or

product

and

property

damage.

1.

This

installation

must

conform

with

all

applicable

local

and

national

codes.

2.

The

power

supply

(volts,

hertz,

and

phase)

must

corre¬

spond

to

that

specified

on

unit

rating

plate.

(See

Fig.

4

for

location.)

3.

The

electrical

supply

provided

by

the

utility

must

be

sufficient

to

handle

load

imposed

by

this

unit.

4.

Refer

to

the

dimensional

drawings

(Figs.

2

and

3)

for

locations

of

electrical

inlets,

condensate

drain,

duct

connections,

and

required

clearances

before

setting

unit

in

place.

5.

Unit

designed

for

outdoor

installation

on

wood

flooring

or

on

class

A,

B,

or

C

roof

covering

materials.

GENERAL

Model

50NQ

Packaged

Heat

Pump

has

been

designed

and

tested

in

accordance

with

ARI

Standard

240,

270

and

U.L.

Standard

559.

These

units

are

factory-charged

with

R-22

refrigerant.

Installation

is

simple:

connect

air

ducts,

high-

and

low-

voltage

wiring,

condensate

drain,

and

install

a

field-supplied

air

filter.

All

units

can

be

connected

into

existing

duct

systems

that

are

properly

sized

and

designed

to

handle

an

airflow

of

375

to

450

Cfm

per

each

12,000

Btuh

of

rated

cooling

capacity.

Refer

to

pre-sale

literature

for

detailed

air

delivery

capacity.

NOTE:

When

installing

any

accessory

item,

see

the

manu¬

facturer’s

Installation

Instructions

packaged

with

the

accessory.

The

Qualified

Agency

must

use

factory

author¬

ized

kits

or

accessories

when

modifying

this

unit.

Manufacturer

reserves

the

right

to

discontinue,

or

change

at

any

time,

specifications

or

designs

without

notice

and

without

incurring

obligations.

PC

101

Catalog

No

565-116

Printed

in

U.S.A

Form

50NQ-1SI

Pg

1

7-89

Replaces:

New

Book

1

4

Tab

5a

5a

2

Fig.

2—Dimensional

Drawing—Small

Cabinet

O

LU

I—

<S>

DC

o

h-

z

r

<

u;

uj

i-

x§Sr

<

I

o

o

w

o

m

cc

x

v

z

cn

z:

o

ll_

b-

CD

f—

O

—i

•—

U1

>•

O

IUO

p

I

,

Q

Q.

£

I-

1

M

Q.

CL

—

in

o

:x

I—

LLf

UJ

I

■

OQ

I

—*—

:d—-

o

o

'Qinzo

<

cc

z

*-«

o

<

3

Fig.

3—Dimensional

Drawing—Large

Cabinet

DOOR

A89215

Fig.

4—Rating

Plate

Location

Step

1

—

Moving

and

Setting

Unit

in

Place

A

CAUTION

Use

spreader

bars

and

crate

top

when

rigging

the

unit

to

be

lifted.

Model

50NQ

must

be

rigged

for

lifting

as

shown

in

Fig.

5.

Use

extreme

caution

to

prevent

dam¬

age

when

moving

the

unit.

Unit

must

remain

in

an

upright

position

during

all

rigging

and

moving

opera¬

tions.

The

unit

must

be

level

for

proper

condensate

drainage;

therefore,

the

ground-level

pad

or

accessory

roof-mounting

curb

must

be

level

before

setting

the

unit

in

place.

When

a

field-fabricated

support

is

used,

ensure

that

the

support

is

level

and

properly

supports

the

unit.

ROOFTOP

INSTALLATION

A

CAUTION

When

installing

the

unit

on

a

rooftop,

be

sure

that

the

roof

will

support

the

additional

weight.

Refer

to

Figs.

2

and

3

for

total

weight

and

corner

weight

information.

For

downflow

applications,

an

accessory

roof-mounting

*

curb

may

be

installed

on,

and

flashed

into

the

roof

before

unit

installation.

The

instructions

for

installing

the

acces¬

sory

curb

are

packaged

with

the

curb.

For

end-discharge

applications

place

the

unit

on

a

level

base

that

provides

proper

support.

Refer

to

Fig.

7

for

location

of

additional

supports/sleepers.

On

flat

roofs,

be

sure

that

the

unit

is

located

at

least

4

ins.

above

the

highest

expected

water

level

on

the

roof

to

prevent

flooding.

GROUND-LEVEL

INSTALLATION

Place

the

unit

on

a

solid,

level,

concrete

pad

that

extends

approximately

2

ins.

beyond

the

casing

on

all

four

sides

of

the

unit.

Do

not

secure

the

unit

to

the

pad

except

when

required

by

local

codes.

Ensure

pad

does

not

obstruct

coil

drainage

holes

in

bottom

of

unit.

(Holes

drain

water

during

cooling

and

defrost

cycles.)

In

areas

where

prolonged

sub¬

freezing

temperatures

or

snowfall

occur,

increase

clearance

to

12-18

ins.

by

constructing

an

angle-iron

frame

to

support

Fig.

5—Suggested

Rigging

the

unit.

The

frame

should

be

designed

so

as

not

to

block

the

drainage

holes.

See

Fig.

8

and

Table

1

for

recommended

frame

construction.

Extend

a

24-in.

gravel

apron

around

pad

for

condensate

and

defrost

water

drainage.

CLEARANCES

The

required

minimum

operating

and

service

clearances

are

shown

in

Figs.

2

and

3.

Adequate

condenser

air

must

be

provided.

A

CAUTION

Do

not

restrict

condenser

airflow.

An

air

restriction

at

either

the

outdoor-air

inlet

(the

entire

surface

of

the

out¬

door

coil)

or

the

fan

discharge

can

be

detrimental

to

compressor

life.

The

condenser

fan

discharges

through

the

top

of

the

unit.

Ensure

that

the

fan

discharge

does

not

recirculate

to

the

condenser

coil.

Do

not

locate

the

unit

in

either

a

corner

or

under

a

complete

overhead

obstruction.

The

minimum

clear¬

ance

under

a

partial

overhang

(such

as

a

normal

house

roof

overhang)

is

48

ins.

above

unit

top.

The

maximum

horizon¬

tal

extension

of

a

partial

overhang

must

not

exceed

48

ins.

Do

not

locate

the

unit

where

water,

ice,

or

snow

from

an

overhang

or

roof

will

damage

or

flood

the

unit

by

falling

on

the

top.

Do

not

locate

the

unit

where

grass,

shrubs,

or

other

plants

will

interfere

with

the

airflow

either

into

or

out

of

the

unit.

Do

not

install

the

unit

on

carpeting,

tile,

or

other

com¬

bustible

material

other

than

wood

flooring.

Heat

pump

may

be

installed

on

wood

flooring

or

on

Class

A,

B,

or

C

roof

cov¬

ering

materials.

Step

2—Condensate

Disposal

NOTE:

Ensure

that

condensate-water

disposal

methods

comply

with

local

codes,

restrictions,

and

practices.

Model

50NQ

disposes

of

condensate

water

through

a

3/4-in.

NPT

drain

fitting.

See

Figs.

2

and

3

for

location.

Install

a

3-in.

trap

at

the

drain

fitting

to

ensure

proper

drainage.

See

Fig.

6.

Make

sure

that

the

outlet

of

the

trap

is

at

least

1

in.

lower

than

the

unit

drain

pan

connection

to

prevent

the

pan

from

overflowing.

Prime

the

trap

with

water.

If

the

installation

requires

draining

the

condensate

water

away

from

the

unit,

connect

a

drain

tube

using

a

minimum

of

7/8-in.

OD

copper

tubing,

3/4-in.

galvanized

pipe,

or

3/4-in.

plastic

pipe.

Do

not

undersize

the

tube.

Pitch

the

4

1"

MIN.

2"

MIN.

A88130

♦

These

embossments

are

located

on

Large

Cabinet

Units

(048-060

size

only.)

Fig.

7—Additional

Support/Sleeper

Location

©E

©E

©^

®

E

©

■

n

-=nk

1-1/2"

(38mm)

1-1-

1/2"

(38mm)

MATERIAL:

ANGLE

IRON

-

1-1/4"

(31

8mm)

TO

1-1/2"

(38mm)

COMM'L

STD

WELD

FRAME

TOGETHER

PAINT

WITH

ZINC-RICH

PAINT

(RUSTPROOF)

Table

1—Mounting

Frame

Dimensions

Item

No.

Large

Cabinet

Length

Small

Cabinet

Length

Quantity

A

50

in

(1269mm)

40-3/8

in

(1024mm)

—

B

60-1/2

in

(1535mm)

47

in

(1193mm)

__

C

30-1/4

in

(766mm)

23-1/2

in

(597mm)

—

1

12

in

(305mm)

to

24

in

(610mm)

12

in

(305mm)

to

24

in

(610mm)

4

2

60

in

(1523mm)

46-1/2

in

(1181mm)

2

3

49-1/2

in

(1257mm)

39-7/8

in

(1012mm)

2

4

49-1/2

in

(1257mm)

39-7/8

in

(1012mm)

1

5

16

in

(406mm)

16

in

(406mm)

8

Fig.

8—Mounting

Frame

5

drain

tube

downward

at

a

slope

of

at

least

1

in.

in

every

10

ft

of

horizontal

run.

Be

sure

to

check

the

drain

tube

for

leaks.

Condensate

water

can

be

drained

directly

onto

the

roof

in

rooftop

installations

(where

permitted)

or

onto

a

gravel

apron

in

ground-level

installations.

When

using

a

gravel

apron,

make

sure

it

slopes

away

from

the

unit.

Step

3—

Duct

Connections

Model

50NQ

has

duct

flanges

on

the

supply

and

return

air

openings

on

the

side

and

bottom

of

the

unit

except

on

sizes

048

and

060.

048

and

060

sizes

do

not

have

flanges

on

side

discharge

openings.

See

Figs.

2

and

3

for

connection

sizes

and

locations.

NOTE:

The

design

and

installation

of

the

duct

system

must

be

in

accordance

with

the

standards

of

the

National

Fire

Protection

Association

for

installation

of

nonresidence-type

air

conditioning

and

ventilating

systems,

NFPA

No.

90A

or

residence

type,

NFPA

No.

90B,

and/or

local

codes

and

ordinances.

Adhere

to

the

following

criteria

when

selecting,

sizing,

and

installing

the

duct

system:

1.

Remove

appropriate

panels

from

unit

to

obtain

either

horizontal

or

down

discharge.

If

models

018

through

042

are

installed

in

horizontal

discharge

applications,

remove

side

duct

covers,

save

screws,

and

install

the

covers

on

bottom

duct

openings.

To

install

duct

covers

on

bottom

duct

openings,

remove

one

flange

which

interferes

with

heater

mounting

plate.

For

models

048

through

060

remove

either

side

or

bottom

duct

covers

as

needed

and

discard.

2.

Select

and

size

ductwork,

supply-air

registers,

and

return-air

grilles

according

to

ASHRAE

recom¬

mendations.

Refer

to

Tables

2

&

3

for

static

pressure

capability.

A

CAUTION

When

the

duct-system

fastening

holes

are

being

drilled

into

side

of

unit

instead

of

the

unit

duct

flanges,

use

extreme

care

to

avoid

puncturing

the

coil

or

coil

tubes.

See

Fig.

9.

3.

Use

flexible

transition

between

rigid

ductwork

and

unit

to

prevent

transmission

of

vibration.

The

transition

may

be

screwed

or

bolted

to

duct

flanges.

Use

suitable

gaskets

to

ensure

weather

and

airtight

seal.

4.

Install

external,

field-supplied

air

filter(s)

in

return-air*

ductwork

where

it

is

easily

accessible

for

service.

Rec¬

ommended

filter

sizes

are

shown

in

Table

4.

5.

Size

all

ductwork

for

maximum

required

airflow

(either

heating

or

cooling)

for

unit

being

installed.

Avoid

abrupt

duct

size

increases

or

decreases.

6.

Adequately

insulate

and

weatherproof

all

ductwork

located

outdoors.

Insulate

ducts

passing

through

unconditioned

space

and

use

vapor

barrier

in

accor¬

dance

with

latest

issue

of

SMACNA

and

ACC

A

mini¬

mum

installation

standards

for

heating

and

air

condi¬

tioning

systems.

Secure

all

ducts

to

building

structure.

7.

Flash,

weatherproof,

and

vibration-isolate

all

openings

in

building

structure

in

accordance

with

local

codes

and

good

building

practices.

8.

For

Canadian

Installations

Only—An

L-shaped

exhaust

duct

fabricated

of

sheet

metal

or

a

material

rated

94-5V

shall

be

used

in

the

case

of

downflow

applications.

Step

4—Electricial

Connections

A

WARNING

The

unit

cabinet

must

have

an

uninterrupted,

unbro¬

ken,

electrical

ground

to

minimize

the

possibility

of

per¬

sonal

injury

if

an

electrical

fault

should

occur.

This

ground

may

consist

of

electrical

wire

connected

to

the

unit

ground

lug

in

the

control

compartment,

or

conduit

approved

for

electrical

ground

when

installed

in

accor¬

dance

with

the

National

Electrical

Code

ANSI/NFPA-

70

(in

Canada,

Canadian

Electrical

Code

CSA

C22.1)

and

local

electrical

codes.

A

CAUTION

A

failure

to

follow

these

precautions

could

result

in

damage

to

the

unit

being

installed:

1.

Make

all

electrical

connections

in

accordance

with

the

latest

National

Electrical

Code,

ANSI/NFPA-70

and

local

electrical

codes

governing

such

wiring.

In

Canada,

all

electrical

connections

must

be

in

accordance

with

CSA

standard

C22.1

Canadian

Electrical

Code

part

1

and

applicable

local

codes.

Refer

to

Unit

Wiring

Diagram.

2.

Use

only

copper

conductor

for

connections

between

field-supplied

electrical

disconnect

switch

and

unit.

DO

NOT

USE

ALUMINUM

WIRE.

3.

4.

5.

Ensure

that

high-voltage

power

to

unit

is

within

oper¬

ating

voltage

range

indicated

on

unit

rating

plate

(Fig.

4).

On

3-phase

units,

ensure

that

phases

are

voltage

and

current

balanced.

Consult

local

power

company

for

correction

of

improper

voltage

and/or

phase

balance.

Insulate

low-voltage

wires

for

highest

voltage

con¬

tained

within

conduit

when

low-voltage

control

wires

are

run

in

same

conduit

as

high-voltage

wires.

Do

not

damage

internal

components

when

drilling

through

any

panel

to

mount

electrical

hardware,

con¬

duit,

etc.

CAUTION:

DO

NOT

DRILL

OR

SCREW

IN

SHADED

AREA

SUPPLY

5

0"1

RETURN

INLET/OUTLET

PANEL

Cabinet

Size

A

Small

Cabinet

20-1/2"

018-042

Large

Cabinet

21-1/4"

048-060

Fig.

9—Location

of

Coil

Area-

Not

to

be

Drilled

6

HIGH-VOLTAGE

CONNECTIONS

The

unit

must

have

a

separate

electrical

service

with

a

field-

supplied,

waterproof

disconnect

switch

mounted

at,

or

within

sight

from

the

unit.

Refer

to

the

unit

rating

plate

(Fig.

4)

for

maximum

over-current

device

size

and

minimum

circuit

amps

(ampacity)

for

wire

sizing.

The

field-supplied

disconnect

switch

box

may

be

mounted

on

the

unit

over

the

high-voltage

inlet

hole

in

the

control

corner

panel.

See

Figs.

2

and

3.

Proceed

as

follows

to

complete

the

high-voltage

connections

to

the

unit:

1.

Connect

ground

lead

to

chassis

ground

connection

when

using

separate

ground

wire.

2.

Run

high

voltage

leads

into

unit

through

inlet

hole

in

control

box

post,

and

to

contactor

through

the

hole

in

the

bottom

of

control

box.

The

high

voltage

leads

should

remain

in

conduit

until

entering

control

box

and

a

watertight

termination

should

be

made

at

bottom

of

control

box.

SPECIAL

PROCEDURES

FOR

208-V

OPERATION

A

WARNING

Make

sure

that

the

power

supply

to

the

unit

is

switched

OFF

before

making

any

wiring

changes.

Electrical

shock

can

cause

personal

injury

or

death.

For

operation

of

208

volts,

disconnect

the

yellow

transformer-primary

lead

from

the

contactor.

See

the

unit

wiring

label.

Remove

the

tape

and

cover

from

the

terminal

on

the

end

of

the

blue

transformer-primary

lead.

Save

the

cover.

Connect

the

blue

lead

to

the

contactor

terminal

from

which

the

yellow

lead

was

disconnected.

Using

the

cover

removed

from

the

blue

lead,

insulate

the

loose

terminal

on

the

yellow

lead.

Wrap

the

cover

with

elec¬

trical

tape

so

that

the

metal

terminal

cannot

be

shorted.

Indoor

blower

motor

speed

taps

should

be

changed

for

208V

operation

on

208/230v

rated

units.

Interchange

motor

lead

at

blower

motor.

See

“Start-up

and

Adjustments”

section

(page

9)

and

unit

wiring

label.

CONTROL

VOLTAGE

CONNECTIONS

Locate

the

room

thermostat

on

an

inside

wall

in

the

space

to

be

conditioned

where

it

will

not

be

subjected

to

either

a

cool¬

ing

or

heating

source

or

direct

exposure

to

sunlight.

Mount

the

thermostat

4

to

5

ft

above

the

floor.

Use

No.

18

AWG

color-coded,

insulated

(35

C

minimum)

wires

to

make

the

control

voltage

connections

between

the

thermostat

and

the

unit.

If

the

thermostat

is

located

more

than

100

ft

from

the

unit

(as

measured

along

the

control

voltage

wires),

use

No.

16

AWG

color-coded,

insulated

(35

C

minimum)

wires.

A

grommeted

control

voltage

inlet

hole

is

located

in

the

panel

adjacent

to

the

control

access

panel.

See

Figs.

2

and

3.

Run

the

low-voltage

leads

from

the

thermostat,

through

the

inlet

hole,

and

to

the

control

voltage

terminals.

Connect

the

thermostat

leads

to

the

terminals

as

shown

in

Fig.

10.

HEAT

ANTICIPATOR

SETTING

Factory

thermostats

have

fixed

heat

anticipator

settings.

No

adjustment

is

required.

CIRCUIT

BREAKER

Unit

has

manual

reset

circuit

breaker

which

is

located

in

the

low-voltage

wiring

box

adjacent

to

low-voltage

terminal

board.

If

unit

fails

to

operate,

first

check

breaker

for

tripped

position.

If

breaker

is

tripped,

re-set

and

try

to

start

unit.

If

breaker

continues

to

trip

there

is

a

problem

in

the

low-

voltage

electrical

circuit

(electrical

short,

ground,

or

trans¬

former

overload).

Correct

the

condition

and

check

for

nor¬

mal

unit

operation.

PREPARING

UNIT

FOR

START-UP

A

WARNING

Failure

to

observe

the

following

warnings

could

result

in

serious

personal

injury:

1.

Follow

recognized

safety

practices

and

wear

protec¬

tive

goggles

when

checking

or

servicing

refrigerant

system.

2.

Do

not

operate

compressor

or

provide

any

electric

power

to

unit

unless

compressor

terminal

cover

is

in

place

and

secured.

3.

Do

not

remove

compressor

terminal

cover

until

all

electrical

sources

have

been

disconnected.

4.

Relieve

all

pressure

from

system

before

touching

or

disturbing

anything

inside

compressor

terminal

box

if

refrigerant

leak

is

suspected

around

terminals.

5.

Never

attempt

to

repair

soldered

connection

while

refrigerant

system

is

under

pressure.

6.

Do

not

use

torch

to

remove

any

component.

System

contains

oil

and

refrigerant

under

pressure.

To

remove

a

component,

wear

protective

goggles

and

proceed

as

follows:

a.

Relieve

all

pressure

from

system.

b.

Cut

component

connecting

tubing

with

tubing

cutter

and

remove

component

from

unit.

c.

Carefully

unsweat

remaining

tubing

stubs

when

necessary.

Oil

can

ignite

when

exposed

to

torch

flame.

PRESTARTUP

PROCEDURES

Proceed

as

follows

to

inspect

and

prepare

the

unit

for

initial

startup:

1.

Remove

all

access

panels.

2.

Read

and

follow

instructions

on

all

WARNING,

CAU¬

TION,

and

INFORMATION

labels

attached

to,

or

shipped

with,

unit.

3.

Make

the

following

inspections:

a.

Inspect

for

shipping

and

handling

damages

such

as

broken

lines,

loose

parts,

disconnected

wires,

etc.

b.

Inspect

for

oil

at

all

refrigerant

tubing

connections

and

on

unit

base.

Detecting

oil

generally

indicates

a

refrigerant

leak.

Leak-test

all

refrigerant

tubing

connections

using

electronic

leak

detector,

halide

torch,

or

liquid-soap

solution.

If

refrigerant

leak

is

detected,

see

“Refrigerant

Leaks”

section

on

page

9.

c.

Inspect

all

field-

and

factory-wiring

connections.

Be

sure

that

connections

are

completed

and

tight.

d.

Inspect

coil

fins.

If

damaged

during

shipping

and

handling,

carefully

straighten

fins

with

a

fin

comb.

4.

Verify

the

following

conditions:

a.

Make

sure

that

outdoor

fan

blade

is

correctly

posi¬

tioned

in

fan

orifice.

Blades

should

clear

fan

motor

by

no

more

than

1/4

in.

The

fan

blade

hub

should

be

flush

with

end

of

motor

shaft.

b.

Make

sure

that

air

filter(s)

is

in

place.

c.

Make

sure

that

condensate

drain

pan

and

trap

are

filled

with

water

to

ensure

proper

drainage.

7

THERMOSTAT

&

SUBBASE

(SEE

BELOW)

0

-

&

&

0

-

@

II}-

0

-

UNIT

CONTROL

WIRING

TERMINAL

BOARD

05

>

-<0

~(l)

•

0

)

-<t>

A88057

COOLING

AND

ONE-STAGE

HEATING

(without

Electric

Heater)

THERMOSTAT

UNIT

8

SUBBASE

CONTROL

WIRING

TERMINAL

BOARD

ODT

—

Outdoor

Thermostat

HR

—

Heater

Relay

COOLING

AND

TWO-STAGE

HEATING

(Unit

equipped

with

Electric

Heater,

Supplemental

Heat,

One

Outdoor

Thermostat)

THERMOSTAT

UNIT

a

SUBBASE

CONTROL

WIRING

TERMINAL

BOARD

COOLING

AND

TWO-STAGE

HEATING

(Unit

equipped

with

Electric

Heater,

Supplemental

Heat,

No

Outdoor

Thermostats)

THERMOSTAT

UNIT

a

SUBBASE

CONTROL

WIRING

TERMINAL

BOARD

SHR

—

Supplemental

Heat

Relay

HR

—

Heater

Relay

ODT

—

Outdoor

Thermostat

COOLING

AND

TWO-STAGE

HEATING

(Unit

equipped

with

Electric

Heater,

Supplemental

Heat

Relay,

Two

Outdoor

Thermostats)

Fig.

10—Control

Connections

8

d.

Make

sure

that

all

tools

and

miscellaneous

loose

parts

have

been

removed.

Unit

is

now

ready

for

initial

startup.

REFRIGERANT

LEAKS

Proceed

as

follows

to

repair

a

refrigerant

leak

and

to

charge

the

unit:

1.

Locate

leak

and

ensure

that

refrigerant

system

pres¬

sure

has

been

relieved.

2.

Repair

leak

following

accepted

practices.

NOTE:

Install

a

filter-drier

whenever

the

system

has

been

opened

for

repair.

3.

Add

a

small

charge

of

R-22

refrigerant

vapor

to

system

and

leak-test

unit.

4.

Evacuate

refrigerant

system

if

additional

leaks

are

not

found.

5.

Charge

unit

with

R-22

refrigerant,

using

a

volumetric-

charging

cylinder

or

accurate

scale.

Refer

to

unit

rating

plate

for

required

charge.

Be

sure

to

add

extra

refriger¬

ant

to

compensate

for

internal

volume

of

filter-drier.

START-UP

AND

ADJUSTMENTS

A

CAUTION

Complete

the

required

procedures

given

in

“Preparing

Unit

for

Start-up,”

page

7,

before

starting

the

unit.

Do

not

jumper

any

safety

devices

when

operating

the

unit.

Do

not

operate

unit

in

the

cooling

mode

when

the

out¬

door

temperature

is

below

55

F

(unless

accessory

low-

temperature

kit

is

installed).

Do

not

operate

unit

in

heating

mode

when

outdoor

tem¬

perature

is

above

60

F.

Do

not

rapid-cycle

the

compressor.

Allow

5

minutes

between

“on”

cycles

to

prevent

compressor

damage.

The

unit

compressor

is

equipped

with

a

crankcase

heater.

It

is

recommended

that

heater

be

energized

a

minimum

of

24

hours

before

starting

unit.

To

energize

heater

only,

set

ther¬

mostat

at

OFF

position;

turn

on

unit

main

power

at

discon¬

nect

switch.

TO

START

UNIT—Check

that

main

power

is

on

and

that

compressor

crankcase

heater

has

been

energized

for

at

least

24

hours.

1.

Check

that

heater

main

power

is

on

as

applicable.

2.

Set

selector

switch

at

OFF.

3.

Set

fan

switch

as

desired

(FAN)

(AUTO.).

4.

Set

thermostat

dial

at

the

desired

temperature.

5.

Set

selector

switch

at

HEAT

or

COOL.

Check

system

refrigerant

charge

as

described

in

“Checking

Charge”

section

below.

CHECKING

CHARGE—Factory

Charge

is

shown

on

unit

rating

plate

(See

Fig.

4).

A

CAUTION

Compressor

damage

may

occur

if

system

is

over¬

charged.

Adjust

charge

in

cooling

mode

by

following

procedure

shown

on

the

“superheat

charging

tables”

located

on

unit.

Check

charge

in

heating

by

following

procedure

shown

on

“heating

check

chart”

located

on

unit.

9

INDOOR

AIRFLOW

AND

AIRFLOW

ADJUSTMENTS

A

CAUTION

For

proper

operation,

the

recommended

airflow

is

375

to

450

CFM

for

each

12,000

BTUH

of

rated

cooling

capacity.

Minimum

airflows

may

be

different

if

supple¬

mental

electric

heaters

are

installed.

See

Table

5.

These

units

have

direct-drive

blower

motors.

Blower

motors

are

factory-connected

to

deliver

the

proper

heating

and

cool¬

ing

airflows

at

normal

external

static

pressures.

Tables

2

and

3

show

both

heating

and

cooling

airflows

at

various

external

static

pressures.

Refer

to

these

tables

to

determine

the

airflow

for

the

system

being

installed.

See

Table

4

for

the

rated

heating

and

cooling

airflows.

NOTE:

Be

sure

that

all

supply-

and

return-air

grilles

are

open,

free

from

obstructions,

and

adjusted

properly.

A

WARNING

Disconnect

electrical

power

to

the

unit

before

changing

blower

speed.

Electrical

shock

can

cause

personal

injury

or

death.

The

heating

and/or

cooling

airflow

of

208/230-V

direct-drive

blower

motors

can

be

changed

by

changing

the

lead

connec¬

tions

at

the

blower

motor.

The

motor

leads

Eire

color-coded

as

follows:

black

—

high

speed

blue

=

medium

speed

red

=

low

speed

UNIT

CONTROLS

All

compressors

have

the

following

internal-protection

controls:

1.

High-pressure

Relief

Valve

—This

valve

opens

when

the

pressure

differential

between

the

low

and

high

side

becomes

excessive.

2.

Compressor

Overload

—This

overload

interrupts

power

to

the

compressor

when

either

the

current

or

internal

temperature

become

excessive,

and

automatically

resets

when

the

internal

temperature

drops

to

a

safe

level.

This

overload

may

require

up

to

60

minutes

(or

longer)

to

reset;

therefore,

if

the

internal

overload

is

suspected

of

being

open,

disconnect

the

electrical

power

to

the

unit

and

check

the

circuit

through

the

overload

with

an

ohmmeter

or

continuity

tester.

SEQUENCE

OF

OPERATION

COOLING—On

a

call

for

cooling,

thermostat

makes

circuit

R-O,

R-Y

and

R-G.

When

room

temperature

rises

to

within

2

degrees

of

control

setting

of

thermostat,

circuit

R-0

makes,

energizing

reversing

valve

solenoid

(RVS).

Unit

is

now

in

standby

condition

for

cooling.

As

room

temperature

rises,

the

second-stage

bulb

makes,

allowing

a

circuit

(R-Y)

through

low-pressure

switch

(LPS)

to

contactor

(C),

starting

compressor

(COMP)

and

outdoor

fan

motor

(OFM).

Circuit

R-G

energizes

indoor

fan

relay

(IFR)

starting

indoor

fan

motor

(IFM).

When

thermostat

is

satisfied,

contacts

open

de-energizing

contactor.

Indoor

fan

relay,

compressor

and

motor

stop.

HEATING—On

a

call

for

heat,

thermostat

makes

circuits

R-Y

and

R-G.

Circuit

R-Y

is

completed,

allowing

circuit

through

low-pressure

switch

(LPS)

to

contactor

(C),

starting

compressor

(COMP)

and

outdoor

fan

motor

(OFM).

Circuit

R-G

also

is

completed,

energizing

indoor

fan

relay

(IFR)

and

starting

indoor

fan

motor

(IFM).

Should

room

temperature

continue

to

fall,

circuit

R-W

is

made

through

second-stage

thermostat

bulb.

If

optional

electric

heat

package

is

used,

a

sequencer

is

energized

bring¬

ing

on

first

bank

of

supplemental

electric

heat.

When

ther¬

mostat

is

satisfied,

contacts

open,

de-energizing

contactor

and

sequencer.

Motors

and

heaters

de-energize.

DEFROST—Defrost

board

(DB)

is

a

time/temperature

con¬

trol

which

includes

a

field-selectable

time

period

between

check

if

defrost

is

necessary

(30,

50

and

90

minutes).

Elec¬

tronic

timer

and

defrost

cycle

start

only

when

contactor

is

energized

and

defrost

thermostat

(DFT)

is

closed.

Defrost

mode

is

identical

to

cooling

mode

except

outdoor

fan

motor

stops

and

a

bank

of

optional

electric

heat

turns

on

to

warm

air

supplying

the

conditioned

space.

CARE

AND

MAINTENANCE

To

ensure

continuing

high

performance,

and

to

minimize

the

possibility

of

premature

equipment

failure,

periodic

mainte¬

nance

must

be

performed

on

this

equipment.

This

combina¬

tion

heating/cooling

unit

should

be

inspected

at

least

once

each

year

by

a

qualified

service

person.

NOTE

TO

EQUIPMENT

OWNER:

Consult

your

local

Dealer

about

the

availability

of

a

maintenance

contract.

A

WARNING

The

ability

to

properly

maintain

this

equipment

requires

certain

expertise,

mechanical

skills,

tools,

and

equipment.

If

you

do

not

possess

these,

do

not

attempt

to

perform

any

maintenance

on

this

equipment

other

than

those

procedures

recommended

in

the

Users

Man¬

ual.

A

FAILURE

TO

HEED

THIS

WARNING

COULD

RESULT

IN

SERIOUS

PERSONAL

INJURY

AND

POSSIBLE

DAMAGE

TO

THIS

EQUIPMENT.

The

minimum

maintenance

requirements

for

this

equipment

are

as

follows:

1.

Inspect

air

filter(s)

each

month.

Clean

or

replace

when

necessary.

2.

Inspect

cooling

coil,

drain

pan,

and

condensate

drain

each

cooling

season

for

cleanliness.

Clean

when

necessary.

3.

Inspect

blower

motor

and

wheel

for

cleanliness

each

heating

and

cooling

season.

Clean

when

necessary.

4.

Check

electrical

connections

for

tightness

on

controls

for

proper

operation

each

heating

and

cooling

season.

Service

when

necessary.

A

WARNING

A

failure

to

follow

these

warnings

could

result

in

seri¬

ous

personal

injury.

AIR

FILTER

A

CAUTION

Never

operate

the

unit

without

a

suitable

air

filter

in

the

return-air

duct

system.

Always

replace

the

filter

with

the

same

dimensional

size

and

type

as

originally

installed.

See

Table

4

for

recommended

filter

sizes.

Inspect

air

filter(s)

at

least

once

each

month

and

replace

(disposable-type)

or

clean

(cleanable-type)

at

least

twice

dur¬

ing

each

heating

and

cooling

season

or

whenever

the

filter(s)

becomes

clogged

with

dust

and

lint.

10