CARRIER Package Units(both Units Combined) Manual L0604601

User Manual: CARRIER CARRIER Package Units(both units combined) Manual CARRIER Package Units(both units combined) Owner's Manual, CARRIER Package Units(both units combined) installation guides

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HEATING

50ZH030-060
3-Phase Packaged Heat Pump

& COOLING

Visit "vv'vv'vv.
12_lrri_r. L"
o in

installation, Start-Up and Service instructions
NOTE:

Read

the

entire

instruction

manual

belk_re starting

the

TABLE OF CONTENTS
CONS1 f)ERATIONS
.....................................................

]

installation.
SAFETY

INTRODUCTION
RECEIVING

..........................................................................

AND

INSTALLATION

..........................................

Check Equipn_ent ......................................................................
IDENTIFY
UNIT ................................................................
INSPECT
SHIPMENT
........................................................

2
2
2

Provide Unit Support ................................................................
SLAB MOUNT ...................................................................

2
2

GROUND

MOUNT

............................................................

Provide Clearances ....................................................................
Place Unit ..................................................................................

2
2

Select

and Install

INSTALL

Ductwork

.....................................................

FLANGES

FOR

DUCTWORK

CONNEC-

TIONS (50ZH060
ONLY) ..................................................
CONVERTING
HORIZONTAL
DISCHARGE
UNITS
DOWNFLOW

(VERTICAL)

DISCHARGE

2
TO

......................

ROUTING

CONNECTIONS

POWER

CONNECTING
ROUTING
SPECIAL

LEAD

POWER

ELECTRIC

FOR

6
7

..................................

UNIT ........................

TO UNIT
WIRES

HEAT

PROCEDURES

PRE-START-UP

INTO

GROUND

CONTROL

ACCESSORY

START-UP

LEADS

208-V

.....................

OPERATION

.....................................................................................

Check lor Refi"igerant Leaks ....................................................
LOCATE
AND REPAIR
REFRIGERANT
LEAKS
THE

UNIT

AS FOLLOWS:

9
AND

.............................

Start-Up Cooling Section and Make Adjustnlents
................ 10
CHECKING
COOLING
CONTROL
OPERATION
....... 10
COMPRESSOR

ROTATION

...........................................

LOW

CHARGE

COOLING

HEATING

COOLING

MODE

10
10

.............................................
CHARGING

CHARGE

CHART

............ 11

...........................................

MOTORS

......................................................

LOSS

RELIEF

OF CHARGE

COMPRESSOR

Sequence of Operation
FAN OPERATION
COOLING
HEAT

SWITCH

reserves
PC 101

the right

Fan ............................................................................

Drain

Pan ........ 17
19

and Wiring ...............................................

Metering Devices ....................................................................
Lubrication
..............................................................................

19
19

Liquid

High

Line
Flow

Strainer ................................................................
Valves ...................................................................

TROUBLESHOOTING

...............................................................

START-UP

CHECKLIST

NOTE

1NSTALLER--Beli_re

INSTRUCTIONS

............................................................
installation,

CAREFULLY

make sure the User's Manual
the unit alier installation.

IX
11

SAFETY

trained

air-conditioning

14
14

Untrained

equipment,

14
14

labels

..................................................

or change

and Condensate

19
19

.........................................

Printed in U.S.A.

Coil

ReliTigerant Circuit ..................................................................
Indoor Airflow ........................................................................

..........................................

to discontinue,

Indoor

Controls

hazardous

DEFROST ..........................................................................
ELECTRIC
RESISTANCE
HEATING ............................
Manufacturer

Coil,

Outdoor

Installation

............................................................
............................................................

HEATING

Outdoor

...............................

..........................................................................

PUMP

16
16

l l

VALVE

OVERLOAD

Unit Top Removal (Outdoor-Coil
Side) ................................
Indoor Blower and Motor .......................................................

Unit Controls ...........................................................................
HIGH-PRESSURE

AND

READ

THESE

COMPLETELY.

and Replacement

Also,

Guide are leli with

Indoor Airflow and Airflow Adjustn-ients ..............................
FOR 208/230-V
.................................................................
FOR 460-V

.........................................................................

Refrigerant
Charge ..................................................................
NO CHARGE ....................................................................
TO USE THE

50ZH

Air Filter ..................................................................................

Electrical

.....7

............................................................................

CHARGE

MAINTENANCE

GROUND.7

..........................

WIRING

Fig. 1--Unit

Provide liar Condensate
Disposal .............................................
Install Electrical
Connections
...................................................
HIGH-VOLTAGE

C00155

and qualified

of air-conditioning
pressure

workers

and electrical
should

workers

can

service

perlimn

people.

pay attention

attached

equipment

can

components.

install,

repair,

Only

or service

equipment.
basic

maintenance

coils and l]lters. All other operations

trained

When

working

to precautions

to the unit, and other

hlnctions

should
on

be perlormed

air-conditioning

in the literature,

tags, and

sali_ty precautions

that may

apply.

at any time, specifications
Catalog

and servicing
due to system

cleaning

CONSIDERATIONS

No. 50ZH-6SI

or designs

without notice
Pg 1

and without
2-06

incurring obligations.
Replaces:

New

all salcty

codes.

Wear salety glasses

quenching
cloth lk_r unbrazing
operations.
available lbr all brazing operations.

and work gloves.
Have

Use

fire extinguisher

A 6-in. wide gravel apron should be used around the flat sl.n'face to
prevent airlIow blockage by grass or shrubs. Do not secure the unit
to the flat snrlace except where required by local codes.
The unit should be level to within 1/4 inch. This is necessary lot
the unit drain to lunction properly.

Belore perlkmning service or maintenance operations on
system, turn off main power to unit and install lockout tag.
Turn off accessory heater power switch if applicable. Electrical shock can cause serious injury or death.

GROUND MOUNT
The unit may also be installed directly on the ground if local codes
permit. Place unit on level ground prepared with gravel lor
condensate discharge.

Recognize salety inlormation. This is tile salcty-alert symbol ,/_ .
Whelk yon see this symbol in instructions or manuals, be alert to
the potential lot personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the salDty-alert symbol.
DANGER identifies the most serious hazards wlaich will result in
severe personal injury or death. WARNING signifies a hazard
which could result ilkpersonal injury or death. CAUTION is used
to identify unsaid practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
These instructions cover mininmm requirements and conl()rnl to
existing national standards and salbty codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residential construction practices. We require these instructions as a
minimum lbr a said installation.

Step 3--Provide

Clearances

The required minimum service clearances and clearances to
combustibles are shown in Fig. 2-4. Adequate ventilation and
outdoor coil air must be provided.
The outdoor fan pulls air through the outdoor coil and discharges
it through the fan on the top cover. Be sure that the fan discharge
does not recirculate to the outdoor coil. Do not locate the unit in
either a corner or under an overhead obstruction. The minimum
clearance under a partial overhang (such as a normal house
overhang) is 48 in. above the unit top. The maxinmm horizontal
extension of a partial overhang nmst not exceed 48 inches.
Do not place the unit where water, ice, or snow fi'om an overhang
or roof will damage or flood the unit. The unit may be installed on
wood flooring or on Class A, B, or C roof covering materials.

Do not restrict

outdoor

the outdoor-air

INTRODUCTION
50ZH

heat

pump

units

are fully

outdoor

installation

shipped

in a horizontal-discharge

a ground-level
discharge
supplied

(See Fig.

compressor

sell'contained

1). As shown
configuration

and designed
lot installation

slab. All units can be field-converted

configurations

lot

rooftop

lbr

in Fig. 2-4, units are

applications

to downflow
with

a field-

plenum.

RECEIVING AND INSTALLATION
Step 1--Check

Equipment

coil airflow.

Step 4--Place

Unit can be moved with the rigging holds provided in the unit base.
Relcr to Table 1 Ik_roperating weights. U.se extreme caution to
pre_ent damage when movillg the unit. Unit must remain in an
upright position durit_g all moving operatiot_s. The unit must be
level with in 1/4" 12_rproper condensate drainage; the ground-level
pad nmst be level belbre setting the unit in place. When a
field-fabricated support is used, be sure that the support is level
and that it properly supports the unit.

The unit model number and serial number arc stamped on the unit
identification plate. Check this inlornmtion against shipping papers. Verify that unit voltage and amperage listed on unit rating
plate agree with power supplied Ibr equipment.

The design and installation
accordance with:

Step 2--Provide

Unit Support

SLAB MOUNT
Place the unit on a rigid, level surl'ace_ suitable to support the unit
weight. A concrete pad or a suitable fiberglass mounting pad is
recommended. The fiat surface should extend approximately 2-in.
beyond the unit casing on the 2 sides. The duct connection side and
condensate drain connection sides should be flush with the edge of
the flat surface.

and Install

Duetwork
of the duct

system must be in

the standards of the NFPA (National Fire Protection Association) lbr installation of nonresidence-type air conditioning and
ventilating systems

NFPA90A or residence-type, NFPA90B; and/or local codes
and residence-type, NFPA 90B

and/or local codes and ordinances

INSPECT SHIPMENT

To prevent loss or damage, leave all parts ilk original packages
until installation.

Unit

Step 5--Select

Check all items against shipping list. Immediately notify the
nearest Carrier Air Conditioning office il' any item is missing.

at either

can be harmful

lilt.

IDENTIFY UNIT

Inspect Ibr shipping damage while unit is still on shipping pallet.
If unit appears to be damaged or is torn loose from its securing
points, have it exandned by transportation inspectors belkwe
removal. Forward claim papers directly to transportation company.
Manufacturer is not responsible lk)rany damage incurred ilktransit.

An air restriction

inlet or the fan discharge

Select and size ductwork, supply-air registers and return-air grilles
according to ASHRAE (American Society o1' Heating, Refrigeration, and Air Conditioning Engineers) recommendations.
Use the duct flanges provided on the supply- and return-air
openings on the side of the unit. See Fig. 2-4 lot connection sizes
and locations. The 14-in. round duct collars (size 030-048 units)
are shipped inside the unit attached to the indoor blower. They are
field-installed and nmst be removed l'rom the indoor cavity prior to
start-up, even if they are not used lbr installation.
INSTALL FLANGES
(50ZH060 ONLY)

FOR

DUCTWORK

The 50ZH060 units are shipped
field-installed on the unit.
To install unit fhmges:

CONNECTIONS

with flanges which nlust be

[

,_]

16 06]
REQUIRED

_/94

CLEARANCE

TO COMBUSTIBLE

MATE

_4080
TOP QF UNIT .........................................................................................
DUCT SIDE QF UNIT .............................................................................
SIDE OPPOSITE DUCTS ......................................................................
BOTTOM OF UNIT .................................................................................

INCHES [rnm]
0
0
0
0

NEC.

REQUIRED
CLEARANCES.
INCHES
BETWEEN UNITS, POWER ENTRY SIDE ....................................
42.00
UNIT AND UNGROUNDED
SURFACES, POWER ENTRY SIDE .36.00
UNIT AND BLOCK OR CONCRETE
WALLS AND OTHER
GROUNDED
SURFACES, POWER ENTRY SIDE ......................... 42.00

[mini
[1666.8]
[914.01
[1066.8]

[
REQUIRED

pressor terminals. Use accepted methods to recover refrigerant.
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 rel]'igerant under pressure. To remove a
component, wear protective goggles and proceed as lollows:

a. Shut olT electrical power to unit and install lockout tag.
b. Relieve all refrigerant from system using both high- and
low-pressure ports. Use accepted methods to recover
refrigerant.
c. Cut component connecting tubing with tubing cutter and
remove component fi'om unit.
d. Carefully unsweat renmiuing tubing stubs when necessary. Oil can ignite when exposed to torch flame.
Use the Start-Up Checklist supplied at the end of this book and
proceed as IkHlows to inspect and prepare the unit Ik_r initial
start-up:

Power

Control

Condenser

Evaporato_Arrf_ow

Table

Wiring

Airflow

ate disconnect

per NEC

_ eec _c hea er when s ng e
(National
point
c_nectionrs
Electrrca_
not
Code
used¸
required

2--Minimum

Airflow

for Safe

Operation
030
750

036
900

C0000t_

Electric

C00008
Heater

(CFM)

SIZE
042
1050

Fig. 8--Typical

048
1200

060
1500

installation

1" (25ram) MIN.
TRAP
OUTLET

2" (50mm) MIN

C99013

Fig. 9--Condensate

1. Remove all access panels.
2. Read and I]Hlow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION
labels anached to, or
shipped with, unit.

*Sepa

Trap (Using Tubing)

TRAP
OUTLET

1" min.

Make the R_llowing inspections:
a. Inspect I_r shipping and handling damages such as broken
lines, loose parts, disconnected wires, etc.

2" min.

b. Inspect lor oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak. Leak-test all refiigerant tubing connections using
electronic leak detector, or liquid-soap solution. If a refrigerant leak is detected, see I_Hlowing Check I_)r Refiigerant
Leaks section.

C00009

c. Inspect all field- and factory-wiring connections. Be sure
that connections are completed and tight. Ensure wires do
not contact rel_'igerant robing or sheet metal edges.
d. Inspect coil fins. If damaged during shipping and handling,
carelidly straighten fins with a fin comb.
3. Verify the lollowing conditions:
a. Make sure that outdoor-fan blade is correctly positioned in
fan orifice. Top edge of blade should be 3.125 in. down
l]'om outdoor coil outlet grille (size 030 048, See Fig. 23)
or hub should be 0.70g-in. away l_'om motor end bell (size
061L See Fig. 24). See Outdoor Fan Adjustment section.
b. Make sure that air filter is in place.
c. Make sure that condensate drain trap is filled with water to
ensure proper drainage.

Fig. lO-PVC

Condensate

Trap

d. Make sure that all tools and miscellaneous loose parts have
been renloved.
START-UP
Use the Start-Up Checklist supplied at the end of this book and
proceed as lk_llows:
Step 1--Check

for Refrigerant

Leaks

LOCATE
AND REPAIR REFRIGERANT
CHARGE THE UNIT AS FOLLOWS:

LEAKS

AND

1. Using both high- and low-pressure ports, locale leaks and
reclaim renmining refrigerant to relieve system pressure.
2. Repair leak lk)llowing accepted practices.
NOTE:
Install a liquid-line l]lter drier whenever the system has
been opened lk)r repair.

HIGH-VOLTAGE
POWERWIRING
ENTRY HOLE

1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is placed
in ON position and shuts down within 30 seecnnds when FAN
switch is placed in AUTO position.

LOW-VOLTAGE
WIRING ENTRY
HOLE

2. Place SYSTEM switch in COOL position and FAN switch in
AUTO position. Set cooling control below room temperature.
Observe that compressor, outdoor fan, and indoor blower
motors start and that reversing valve shifts. Observe that
cooling cycle shuts down when control setting is satisfied.
Reversing valve (RV) remains energized.
3. Place system switch in HEAT position. Observe that compressor, indoor fan and outdoor fan energize (Reversing Valve is
deenergized in heat pump heating mode). Set control above
room temperature. Observe that heating cycle shuts down
when control setting is satisfied.
4. When using an automatic changeover room thermostat, place
both SYSTEM and FAN switches in AUTO. positions.
Observe that unit operates in Cooling mode when temperature
control is set to "call li)r cooling" (below room temperature),
and unit operates in Heating mode when temperature control
is set to "call lot heating" (above room temperature).

C00010

Fig. 11--Unit

Electrical

Connection

COMPRESSOR
CONTACTOR

TRANSFORMER

COMPRESSOR

ROTATION

On all 3 Phase units it is important to be ceriain compressor is
rotating in the proper direction. To determine whether or not
compressor is rotating in the proper direction:

1. Connect
fittings.

service ganges to suction and discharge

pressure

2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure
should rise, as is normal on any start-up.
0

If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:

1. Turn off power to the unit and tag disconnect.
2. Reverse any two of the unit power leads.
3. Turn on power to the unit.

o
0

(3,

The suction and discharge pressure levels should now move to
their normal start-up levels.
NOTF:: When the compressor is rotation in the wrong direction,
the unit makes an elevated level of noise and does not provide
cooling.
Step a--Refrigerant

ELECTRIC
HEATER
FUSES

GROUND
LUG

INDOOR
FAN
RELAY

OUTDOOR FAN MOTOR
AND COMPRESSOR
START CAPACITOR

Fig. 12--Control
Step 2iStart-Up

and Make Adjustments

NO CHARGE
Re{i:r to Can'ier Refrigerant Service Techniques. Use standard
evacuating techniques. Alter evacuating system, weigh in the
specified amount of re{5"igerant (re{i:r to Table 1).

Complete the required procedures given in the Pre-Start- Up
section this page belore starting the unit. Do not jumper any
sali:ty devices when operating the unit.
Do not operate the compressor in cooling mode when the
outdoor temperature is below 40 F.
Do not rapid-cycle the compressor. Allow 5 minntes between
"on" cycles to prevent compressor damage.
CHECKING COOLING

Charge

Rel]'igerant Charge
Amount of rel_'igerant charge is listed on
unit nameplate and in Table 1. Re{i:r to Carrier Rel?'igerant Service
Techniques Manual, Re{?'igerants section. Unit panels lnust be in
place when unit is operating during charging procedure. Unit nmst
operate a minimum of 15 minutes belk_re checking charge.

Box Wiring

Cooling Section

HIGH
VOLTAGE
LEADS
C00011

LOW CHARGE COOLING
Using cooling charging chart (see Fig. 18 22),Vary rel?'igerant
until conditions of the chart are met. Note that charging chart is
difli:rent {?'omthose normally used. Charts are based on charging
the units to the correct superheat {k)r the various operating
conditions. An accurate pressure gauge and temperature-sensing
device is required. Connect the pressure gauge to the service port
on the suction line. Connect temperature sensing device to the
suction line near the colnpressnr and insulate it so that outdoor
ambient temperature does not al_i_ct reading.

CONTROL OPERATION

Start and check the unit (or proper cooling control operation as
follows:
10

UNIT GROUND

GROUND
r

LEAD

/ SINGLE'PHASE
I_3-PHASE
/ CONNECTIONS 4CONNECTIONS 1TO DISCONNECTI .
TO DISCONNECT1PER NEC
L_
PER NEC

=--

- - -

L
Fig. 13--Line

_ Z__ BLK-

z__

YEL-

- z_-

BLU- -/

L..__

®
®

L_.__.

This metllod
ambient

is to be used in cooling

temperature

charts

to determine

suction

temperature

is low, carefldly
pressure

mode

what

the suction

To change

only. Take
pressure

be.

Recheck

the suction

Temperature
Pressure--74

psig

Suction

Temperature

should

Table

Airflow

For cooling

4 shows

Tables
NOTE:

and

operation,
12,000

Airflow

Bmh of rated

pressure

Be sure that

Adjustments
airflow

cooling

is 350 to

capacity.

liar horizontal

and return-air

and adjusted

elech'ical

changing

serious

injury

discharge

units.

grilles

are open,

properly.

leads are color coded

2-SPEED
black = to purple

orange = medium speed

purple = to black

blue = low speed

red = line

Controls

blower

speed.

Electrical

operation.
speed

shock

can

by changing

Units 50ZH030

motors

are factory

wired

li)r

and 042 are factory

wired

li)r

motor

leads

COMPRESSOR
as lk_llows:

This overload
current

3-SPEED

2-SPEED

black = high speed

cally

differential

between

the low

resets

therelore,
disconnect

red = low speed

througla

OVERLOAD
interrupts

or internal
when

This overload

blue = medium speed
red = low speed

VALVE

Located on the outdoor liquid line is a low-pressure switch which
functions as a loss-of-charge switch. This switch contains a
Schrader core depressor. This switch opens at 7 psig and closes at
22 psig. No adjusm_ent is necessary.

operation.

are color-coded

controls.

LOSS OF CHARGE SWITCH

of the

FOR 208/230-V
The

RELIEF

This valve opens when the pressure
and high side becomes
excessive.

cause

the lead connections

have die Ibllowing internal-protection

HIGH-PRESSURE

lag

or dealh.

Units 50ZH 036, 048, and 060 blower
medium

as lbllows:

black = high speed

Step 5--Unit

power to the unil and inslall lockonl

Airflow can be changed
blower motor.

low speed

parts.

MOTORS

All compressors

before

the fan

with units

To change the speed of the indoor tim motor (1FM) from low speed
to high speed, remove the red lead from the indoor-fan relay (IFR).
ON 2 Speed Motors: Insulate the red lead to avoid contact with
any chassis parts. Separate the black lead fi'om the purple lead.
Connect the black lead to the IFR. Insulate the purple lead to avoid
contact with any chassis parts. ON 3-Speed Motors: remove the
fan motor speed leg lead freln the indoor (indoor) fan relay (1FR)
and replace with lead liar desired blower motor speed.

drops.

all supply-

free fi'om obstructions,

Disconnecl

remove
(IFR)

yellow = line

the recommended

dry coil air delivery

5-7 show

l_ith chassis

may vary +/- 5°F.

Do not attempt to adjust charge by cooling methods while in heat
pump heating mode. Recover refrigerant and weigh in according to
unit data plate relhigerant data.

450 cfln per each

fan relay

3-SPEED (060 ONLY)
be--60°F

Temperature

4--Indoor

fi'om the indoor

85°F

HEATING MODE CHARGE

NOTE:

C99056

Connections

lead to al,oM col/act

The motor

Suction

GRN --

UNIT CONTROL POWER
SPLICE BOX

of the indoor Ian motor (IFM),

leg lead

FOR 460-V

18)

Outdoor

Step

the speed

speed

removed

temperature

is adjusted.

(See Fig.

030, 042, 048 & 060 or the time delay relay (TDR) on 036 size and
replace with lead lor desired blower motor speed, lnsuh_te the

Reli:r to

should

If suction

some of the charge.

motor

tile outdoor

gauge.

temperature

is high, add rcl_'igerant.
recover

Note--Suction

CHART

and read the suction

as charge

Example:

CHARGING

C00012

Power Connections

Fig. 14--Control
COOLING

ORN --

_RED

THERMOSTAT
AND SUBBASE

TO USE THE

_BRN--

power

temperature
the internal

may require

if the

internal

the electrical
the overload

to the compressor
become
temperature

drops

up to 60 minutes
overload
power

the

and automatito a sale

(or longer)

is suspected

to the unit

with an ohnnneter

when either

excessive,

of being

and check

or continuity

level.

to reset;
open,

the circuit
tester.

LOAD

XcB

SIDE

TRAM

YEL

DFT

PNK

RN =

WHTI

24V
(SEE

....

LPS

ORN

'BLU_BLU

RED

BRN_<__

BRN_
BRN

SEE

_ZJ

ACCESSORY

W-HT _
_

HEATER

LABEL

_PxL ICE

NOTE#2]

NOTES

DEFROST

CYCLE

OFT
COMPRESSOR

BELAY
FAN

2,SEE

PRICE

PAGES

AND
3.SET

SUBBASE
PART NUMBERS.
HEAT ANTICIPATOR
AT .B

4,USE

75_C

COPPER

FOR

THERMOSTAT

CONDUCTORS

C10
ONLY,

BRN_EL_E_

OF%OF

BEOUENCE

TDR

(TI,T2)
15 SEC

CLOSES
[TSTAT)

cT1

T+6

MIN,

T+BO
LAST

OPENS

ENERG]ZED

ENERGIZED

FIELD

_LE_BLK_GRN

SPLICE

MARKED

FAN

0
_I_ 41_I='Iml

ELjIGNDBLL_
..........

...........
YE

WIRE

CMAPC2Ap

I
Ill

EQUIPMENT

TERMINAL

BLOCK

FU
GNB

FUSE
GROUND

__IL_I

ENTRY

MOTOR
T[ME
BELAY

DEFROST

OFT
OR
IFR

DEFROST
THERMOSTAT
OEFROST RELAY
INDOOR
FAN RELAY

RECEPTACLE

IFM
LPS

INDOOR
FAN MOTOR
LOW PRESSURE
SWITCH

FACTORY

OFM

OUTOOOR

PL
RVS

PLUO
REVERSING

VALVE

SLOW

FUSE

TDR
TRAN

TIME
OELAY
TRANSFORMER

F[ELD

(MARKED)

WIRING
WIRING

CONTROL

FIELD

POWER

ACCESSORY

NOT
POWER

BREAKER

EQUIP

WIRING
OR

INDICATE

POTENTIAL

24V

CIRCUIT

(UNMARKED)

DISCONNECTIIT_

CAPACITOR

TERMINAL

SPLICE

iFCMAPIA p

CONTACTOR,COMPRESSOR

CAP

COMPRESSOR
COMPRESSOR

(_@

COMP
CTB

SPLICE

MAXIMUM
T+IO
M[N

(MARKEO)

ACcON_sE_TIONoNB_yX

T=50
T=30
T=90

TERMINAL

PLU@

...........I

LEGEND

COMPONENT ARRANGEMENT

INDOOR

DEFROST
CYCLE
o

OPTIONAL

WIRING

BOARD

FAN

BLOW

MOTOR

SOLENOID

RELAY

COMMON
ONLY:

REPRESENT

WIRING

LCJ L_
Fig. 15--208/230-3-60
12

Wiring Diagram

A06055

SCHEMATIC
.........

480

IELD

3 80

.......

OFR
....

_C_

p
BLK _
I_LT_YEL_r'__'¥ELI------7_YEL_

yOLU_ i /I

C r BLK:41

WITH

....

5,10,15

SIZE

_ 20

YEL

AW8

OT_

.....

I I

YEL '
BLU

.............
SEE ELECTRIC

=_IO=_

i
i

|.......

8SOPXLICE

RED

....
_EL

BLK_)IF
_

YEL

......
J-._

IFM_

IBLK'

....................

24V

COMP

BLU

..............
_-----fl--OLU--_--RED
_BLU

......

CAP2
YEL_BRN_

LSU____I_._BLu_il--------_E'L|
USED

LOAD

SIDE

.,,I-- ...... --_

FRED--CX:

........

I
I
SUB

THERMOSTAT

BASE

FAN _°N

%TRAM

_
SPLICE

_
(SEE

_BRN_

NOTE_2)

OFT
COMPRESSOR

DELAY
FAN

OTO_

DEFROST

SEQUENCE

CYCLE

OFI,OF_

(TI,T2)

2SEE
AND
3SET
4USE

PRICE PAGES FOR THERMOSTAT
SUBBASEPART NUMBERS.
HEAT ANTICIPATOR AT .8
75"C COPPER CONDUCTORSONLY.

SEC

T+5

MIN.

(1,3)
TDR
0

CLOSES
ITSTAT)

#_NS

...._........

T+BO

gR
.....

LAST
L

DEFROST
CYCLE
o

T=50
T=30
T=90

MAXIMUM
T+IO
MIN

LEGEND
BRNYELBLK_

COMPONENT ARRANGEMENT
FIELD

SPLICE

MARKED

WIRE

COMP
CTD

COMPRESSOR
COMPRESSOR

EQUIP

EQU[PMENT

GNO
DB

GROUND
DEFROST

OFT

DEFROST

SPLICE

BLOCK

(MARKED)

PLUG
RECEPTACLE
FACTORY

W[RIN8

F]ELD

CONTROL

F]ELD

POWER

ACCESSORY
TO

]NOICATE

POTENTIAL
NOT

I_SCONNECT/_
D
PER

NEC

.............

r_l

WIRIN8
WIRING
OPTIONAL

INDOOR

LPS

LOW

OFM

OUTDOOR

MOTOR
TIME
DELAY

BOARD
THERMOSTAT

DEFROST

IFM

COMPRESSOR

BREAKER

(UNMARKED)

(_o

_m_

C[RCU[T

(MARKED)

SPL]CE

CAPAC[TOR

TERMINAL
TERMINAL

CONTACTOR,

CAP

TERMINAL

RELAY
FAN

MOTOR

PRESSURE

OFR

OUTDOOR

PL
QT

PLUG
QUADRUPLE

RVS
TRAM

REVERSING
TRANSFORMER

SWITCH

FAN

MOTOR

FAN

RELAY

TERMINAL
VALVE

SOLENOID

WIRING

COMMON
ONLY:

REPRESENT

WIRING

r_l

Fig. 16--460-3-60

Wiring Diagram
13

A06056

C _

= BRN(COMMON=)

Wl_

- -VLO-[S-TE-P-2L

w1_,i = VV_T_SZEPJ ).....

I
I

CONTACTOR2

UNIT POWER
WIRING

FUSE BLOCK

CONTACTOR 1

AYTO-LIMIT BLK

L24Z -, IYE'

t -, olBLK"

YELl_

_IYEL

°!
C00014

Fig. 17--Accessory
Step 6--Sequence

Electric

of Operation

Heater Wiring

Should room temperature continue to fall, circuit R-W is nmde
through second-stage thermostat bulb. If optional electric heat
package is used, a relay is energized, bringing on first bank of
supplemental electric heat. When thermostat is satisfied, contacts
open, deenergizing contactor and relay; motors and heaters deenergize. The 1FM may be controlled by a tin(e-delay relay that keeps
the fan on fl)r 30 seconds.

FAN OPERATION
The FAN switch on the thermostat controls indoor fan operation.
When the FAN switch is placed in the ON position, the IFR
(indoor-fan relay) is energized through the G terminal on the
thermostat. The normally-open contacts close, which then provide
power to the indoor (evaporator) fan motor (IFM). The 1FM will
run continuously when the FAN switch is set to ON.

DEFROST

When the FAN switch is set to AUTO, the thermostat deenergizes
the IFR (provided them is not a call li)r cooling). The contacts ()pen
and the ]FM is deenergized. The 1FM will be energized only when
them is a call lot cooling, in heat pump heating mode or if the unit
is equipped with accessory electric heat, the indoor-fan motor will
also run while the accessory electric heat is energized.

Deli'ost board (DB) is a time and temperature comrol, which
includes a field-selectable time period between checks fl)r deli'ost
(30, 50 and 90 ndnutes). The time period is li_ctory-set at 30
minutes and should only be adjusted by a trained service person.
Electronic timer and delh)st cycle start only when contactor is
energized and defi'ost thermostat (DFT) is closed.

NOTE: Some units are equipped with a time-delay relay. On
these units, the indoor lhn renmins on li)r 30 seconds alter G or Y
is deenergized.

Deli'ost mode is identical to Cooling (((ode. The outdoor fan motor
stops because of "OFI" and "OF2" contacts opening on the defrost
board, a bank of optional electric heat turns on to warm air
supplying the conditioned space.

COOLING

ELECTRIC RESISTANCE

With the thermostat subbase in the cooling position, the thermostat
makes circuit R-O. This energizes the reversing valve solenoid
(RVS) and places the unit in standby condition R(r cooling.

If accessory electric heaters are installed, on a call fl)r "Emergency
Heat" the thermostat energizes W which energises the heater mlay
and in turn energizes the electric healers. The IFR is energized
which starts the indoor-fan motor. If the heaters are staged, W2 is
energized when the second stage of heating is required. When the
need fl)r heating is satislied, the heater and IFM are deenergized.

NOTE: The defrost control board has a 5 minute compressor
anti-short cycle time delay built in between compressor starts.
On a call lor cooling, tile compressor contactor
energized through the Y and G terminals
Energizing the compressor contactor supplies
pressor and the outdoor (condenser) fan motor
the 1FR provides power to the IFM.

HEATING

MAINTENANCE
To ensure continuing high perR(rnmnce, and to reduce the possibility of premature equipment failure, periodic nmintenance nmst
be perli.)rmed on this equipment. This cooling unit should be
inspected at least once each year by a qualil]ed service person. To
troubleshoot cooling of units, reler to Troubleshooting chart in
back of book.

When the need fi)r cooling has been satisfied, the OFM, compressor, and IFM (FAN on AUTO) are deenergized. If the unit is
equipped with a 30-second delay (036 size only), the indoor fan
will renmin energized li)r 30 seconds alter the compressor is
deenergized. The reversing valve solenoid renmins energized.

NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.

HEAT PUMP HEATING
On a call for heat, thernmsmt makes circuits R-Y and R-G. When
compressor time delay (5-minute _+2 minutes) is completed, a
circuit is made to C, starting COMP and OFM. Circuit R-G also
energizes 1FR and starts IFM after l-second delay.
14

Table 3--Electrical
UNiT 50ZR
SIZE
(-SERIES, IF
USED)

V-PH-HZ

VOLTAGE
RANGE
MIN

MAX

COMPRESSOR
RLA

OFM
FLA

Data--50ZH
ELECTRIC

IFM
FLA

LRA

Nominal KW*

-/O3O

208/230-3-8

187

254

10.0

63.0

1.5

3.8/5.0
7.5/10.0

5.8

11.3/15.0
-/-

208/230-3-80

187

254

77.0

11.4

1.5

3.8/5.0
7.5/10.0
11.3/15.0

2.8

036

HEAT

SINGLE

FLA

MCA

-/-

16.8

10.4/12.0
20.8/24.1
31.3/36.1

29.9/31.8

-/10.4/12.0
20.8/24.1
31.3/36.1

18.6/18.6

POINT POWER SUPPLY

FUSE OR
CKT BKR
20
35/35
45/50
60/-

42.8/46.9
56.1/61.9

25/25
35/35
45/50
60/-

31.7/33.6
44.6/48.7
57.8/63.7

414

508

39.0

5.7

0.8

5
10
15

1.5

-/-

208/230-3-80

187

254

88.0

13.9

1.5

3.8/5.0
7.5/10.0
11.3/15.0
15/20

2.8

6.0
12.0
18.0
-/10.5/12.0
20.8/24.1
31.4/36.1
41.4/47.9

16.9
24.4
31.9
21.7/21.7
34.8/36.7
47.7/51.8
73.4/81.6

80/90

15
2O
3O
35
45

10.8

414

508

44.0

6.8

0.8

5
10
15
2O

1.5

6.0
12.0
18.0
24.1

3.8/5.0
7.5/10.0
11.3/15.0
15/20

-/10.5/12.0
20.8/24.1
31.4/36.1
41.4/47.9

5
10
15
2O

6.0
12.0
18.0
24.1

-/-

208/230-3-80

187

254

93.0

12.8

1.5

4.2

048

460-3-80

414

508

46.5

6.4

0.8

2.1

-/-

208/230-3-80

187

254

15.9

124.0

3.1

3.8/5.0
7.5/10.0
11.3/15.0
14.9/19.9

6.2

060

18.3
25.8
33.3
40.9

25/25
35/40
50/60

21.7/21.70

-/10.5/12.0
20.8/24.1
31.4/36.1
41.4/47.9

34.8/36.7
47.7/51.8

70/70
80/90

61.0/66.8
73.7/81.8

15
2O
3O
35
45

10.9
18.4
25.9
33.4
41.0

42.3/44.2

35/35
45/45

55.2/59.3

60/60

29.2/29.2

70/80

68.4/74.3
81.2/89.3

90/90

2O
25
3O
4O
45

14.7
480-3-80

(See legend following

414

508

8.0

59.6

1.5

5
10
15
19.9

3.2

6.0
12.0
18 .0
23.9

22.2
29.7
37.2
44.6

Electrical Data charts)

EXAMPLE:
A
FLA
-- Full Load Amps
LRA
-- Locked Rotor Amps
MCA
-- Minimum Circuit Amps
MOCP -- Maximum Overcurrent Protection
RLA
-- Rated Load Amps
CKT BKR -- Circuit Breaker

LE ENO

Supply voltage is 460-3-60.
AB = 452 v
AC = 455 v

Average Voltage = 452 + 464 + 455
3
BC = 464 v
_ 1371
3
= 457

NOTES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. Canadian units may be
fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced
3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.

Determine maximum deviation from average voltage.
(AB) 457 452=5v
(B0) 464 457=7v
(AC) 457 455 =2v
Maximum deviation is 7 v.
Determine

percent of voltage imbalance.
7
% Voltage Imbalance = 100 x -457
= 1.53%
This amount of phase imbalance
maximum allowable 2%.

% Voltage imbalance
= 100 x

-/70

70/70

60.9/66.8

042

460-3-80

-/70

15
2O
25
35
30/30
35/40
50/50

9.9
480-3-60

MOCP

max voltage deviation from average voltage
average voltage

is satisfactory

as it is below the

IMPORTANT:
If the supply voltage phase imbalance
is
more than 2%, contact your local electric utility company
immediately.

The ability to properly perlbrn_ maintenance on this equipment requires certain expertise, mechanical skills, tools and
equipment. If you do not possess these, do not attempt to
perlbrn_ any maintenance on this equipment, other than those
procedures recommended in the User's Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SERIOtIS 1NJURY, DEATH OR DAMAGE TO THIS EQUIPMENT.

Disconnect and tag electrical power to the unit belk}re
removing top. Failure to adhere to this warning could cause
serious injury or death.
Only qualified service personnel should perlorm maintenance and
service procedures that require unit top removah
Reli:r to the lbllowing top removal procedures:
1. Remove 7 screws on unit top cover surface. (Save all screws.)
2. Remove 2 screws on unit top cover flange. (Save all screws.)

The minilnum maintenance requirements %r this equipment are as
lollows:
1. Inspect

air

filter(s)

each

month.

Clean

replace

3. Lift top l?'om unit carefully. Set top on edge and make sum
that top is supported by unit side that is opposite duct (or
plennm) side.

when

necessary.
2. Inspect

indoor

drain each

coil, outdoor

cooling

coil, drain

and heating

season

pan,

4. Carefully replace and secure unit top to uniL using screws
removed ilk steps 1 and 2 above, when maintenance and/or
service procedures are completed.

and condensate

lbr cleanliness.

Clean

when necessary.
3. Inspect

blower

and heating
season,

Step 3--indoor
motor

season.

inspect

cleaning

and wheel
Clean

blower

lot cleanliness

when

wheel

necessary.

bimonthly

For l]rst heating

to determine

proper

[?'equency.

4. Check

electrical

connections

proper

operation

each

lbr

the

channel

ilk the

insects).

Clean

cooling

tightness

season.

and controls

Service

when

lk_r

Disconnect and tag electrical power to the unit bel_re
cleaning the blower wheel. Faihn'e to adhere to this warning
could cause serious injury or death.

neces-

sary.
5. Check

Blower and Motor

For hmger lili:, operating economy, and continuing efficiency,
clean accunmlated dirt and grease l?'om the blower wheel and
motor annually.

each cooling

blockage

drain

(leaves,

top

cover

periodically

To clean the blower wheel:

as needed.

1. Access the blower assembly as lollows:
a. Remove top access panel.
b. Remove 3 screws that hold blower orifice ring to blower
housing. Save screws.

Failure to lollow these warnings could result in serious injury
or death:

c. Loosen setscrew(s) which secure wheel to motor shaft.
2. Remove and clean blower wheel as lollows:

1. Turn off electrical power to the unit and install lockout tag
beli_re perlorming any maintenance or service on the unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injury can result
15"oresharp edges, etc.
3. Never place anything combustible either on, or ilkcontact
with, the unit.
Step 1--Air

Filter

m E:: ::ikt:i:Kt=Kt :
j

NOTE: Never operate the unit without a suitable air lilter ilkthe
return-air duct system. Always replace the l]lter with the same size
as originally installed. See Table 1 lor recommended filter sizes
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during
each cooling season or whenever the filters become clogged with
dust and lint.
Replace filters with the same dimensional
originally provided, when necessary.
Step 2--Unit

Top Removal

(Outdoor-Coil

_$52=8o_-"d:N:kt:t:taNd:t_"
_
E. ......
_ I_
.
_:::_:-:-:_7s

:'__

_04831LU70_=:

'_ ::_jZ_

LLI

Q-

£1-

___

: .....................................
_--

.....

....

E--

,€

-_,

--_

:t N

size and type as
40

_o 4d 0
_276

I--_

...
.

---I.T.$.g..£,,,W

I ,

::
''_

Side)

207130 -:J,

NOTE: When perli}rming maintenance or service procedures that
require removal of the unit top, be sure to per%rm all of the routine
maintenance procedures that require top removal, including coil
inspection and cleaning, and condensate drain pan inspection and
cleaning.

30
I

-1

lllillllllll
I

Charging

1
90

(°F)
I

4
10
16
21
SUCTION LINE TEMPERATURE

Fig. 18--Cooling

:::lllllllill

40
50
60
70
SUCT!ON L!NE TEM PERATURE

(°C)

Chart--5OZH030 c°°_63

gi1140

SUCTION

40
50
60
70
SUCTION LINETEMPERATURE

-1

4
10
16
21
SUCTION LINE TEMPERATURE

LINE TEMPERATURE

90
27

164

IllIII

UTDOORTEMP

100-_

II ..........................................
£[
1!
°F
°C II.

[ [Ll.L_I

.683

0166

,-11,--

,1108
_
95 35

_:"
46
-

621 _'90-

_8 38 :

_ 88 _

552 _80
CO

IIII

III1[

483 _70

483552
_80-_70_
_-_-_
_!!i_

"'6521_75
55 24H_1318""

__ _-J=N-H =

Io m+
3451D50 _ _ _
I_ll

11[1

1 Ell

I I

Jl[ll

III

I_[[I
I

III

348>o................

IIIll
I

I III

l[[llJl[

I Ill

z60. i

:l:gA__
_ __ _ _

_ I _ I

I111

207

30.

Illlllll

40
50
60
70
SUCTION LINETEMPERATURE

-1

4
10
16
21
SUCTION LINE TEMPERATURE

SUCTION LINE TEMPERATURE (°F)
I

-1

,q ,,,,,,

27
(°C)

4
10
16
21
27
o
SUCTION LINE TEMPERATURE (C)

32
C00165

Fig. 20--Cooling
a. Lift

Charging

wheel from

housing.

Chart--50ZH042

When handling

blower wheel, be sure not to disturb
on blower wheel vanes.

Fig. 22--Cooling

Units

and/or cleaning

balance

weights

e. Replace

(clips)

Step
Drain

b. Remove
caked-on
dirt from wheel and housing
with a
brush. Remove lint and/or dirt accumulations
l]'om wheel
and

housing

attachment.

with
Remove

c. Reassemble

blower

on blower

to judge

wheel
orifice

vacuum
grease

cleaner,

a soft

brush

and oil with a mild solvent.

into housing.
location

using

Place upper

of the blower

orifice

wheel.

ring

Blower

d. Set upper

on motor
orifice

and are not on round
ring in place

removed

and

requircs
the removal
section abole.

Remove

all obstructions

Coil,

and

Condensate

coil, and condensate

cooling

cleaning
Removal

vacuum

part of shaft.

with 3 screws

Indoor

coil, indoor

beating

un ts

paneh

Coil,

the outdoor

once

C00167

Chart--50ZH060

season.
of the

(including

Proper
unit

weeds

top.

drain pall at
inspection

and

See

Top

and shrubs)

Unit

that inter-

Ibm with the airflow through the outdoor coil. Straighten bent fins
with a fin conlb. If coated with dirt or lint, clean the coils with a

should be approximately
0.2-in. below bottom of
ring when centered correctly. Be sure setscrews am

tightened

top access

4--Outdoor
Pan

Inspect
least

Charging

cleaner,

using

bend the l]ns. If coated
in

mild

step 1 above.

using

a soft brush

detergent-and-water-solution.
a garden

hose.

attachment.

with oil or grease,
Be carclM

Rinse

clean
coils

not to splash

Be careful

not to

the coils

with a

with
water

clear

water,

on motors,

Table 4--Dry Coil Air Delivery* Horizontal Discharge
(Deduct 10 percent for 208 Volt Operation)
230 AND 460 VOLT
Unit

Watts/CFM

Motor Speed
Low
Med

030

High
Low
Med

036

High
Low

042 t

Med
High
Low

Low
Med

High
t 480-v motors are 2-speed.
Air delivery values are based on operating
to obtain external static pressure availabe
Do not operate the unit at a cooling airflow
this point.
Dashes indicate portions of the table that

Table 5--Wet
UNIT SIZE
5OZH
030

038

042

048

060

0.3

Watts

288

285

282

279

274

268

261

0.7

0.8

Cfm

875

820

802

734

668

582

478

Watts

390

383

378

369

360

350

340

Cfm

1131

1090

1038

978

917

830

721

Watts

528

520

510

495

480

460

450

Cfm

1891

1338

1285

1200

1115

1018

920

Watts

450

435

420

400

380

335

326

311

Cfm

1231

1218

1204

1120

1008

950

863

751

Watts

470

450

445

410

388

359

338

321

Cfm

1302

1264

1205

1163

1081

940

873

783

Watts

660

635

610

575

540

505

485

460

0.9

Cfm

1700

1660

1581

1450

1297

1190

1095

999

Watts

478

458

440

411

378

350

327

317

Cfm

1303

1270

1224

1179

1126

1022

911

816

Watts

481

468

450

438

404

370

338

320

Cfm

1310

1280

1241

1181

1110

1022

943

811

Watts

798

678

647

618

578

540

500

460

Cfm

1736

1688

1618

1510

1421

1309

1187

1060

Watts

801

760

730

688

650

600

570

Cfm

1898

1841

1757

1682

1564

1429

1333

Cfm

High

080 t

0.2

Watts

Med

048 t

External Static Pressure (in. wg)
0,4
0.5
0.8

0,1

Watts

870

842

818

782

696

632

828

Cfm

2000

1903

1799

1718

1625

1446

1385

Watts

890

850

810

790

735

680

580

480

422

Cfm

1834

1820

1791

1762

1703

1640

1415

1159

950

Watts

1040

1018

1000

950

890

835

790

650

58O

Cfm

2230

2102

2025

1960

1901

1855

1752

1468

1121

Watts

1073

1038

1001

958

898

840

800

691

575

Cfm

2230

2202

2160

2122

2052

1926

1791

1588

1202

voltage of 230-v. or 460-v., dry coil, without filter or electric heater. Deduct wet coil filter, and electric heater pressure drops
for ducting.
that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below
are beyond the blower motor capacity or are not recommended.

Coil Pressure Drop

AIRFLOW
(CFM)
900
1000

PRESSURE

Table 6--Filter
DROP

UNiT
SiZE
50ZH

(IN. WG)
0.08
0.08

1000

0.07

1200

0.09

1400

0.11

1600
1000

Pressure Drop (In. wg)
CFM

600

700

800

900

1000 1100 1200

080-042 24x24
0.06 0.07 0.08 0.08 0.09 0.09
048, 060 24 x 30

0.08

1200

FILTER
SIZE
(IN.)
500

0.09

0.10

1300

1400

0.11

0.12

0.08

0.09

0.12

UNiT
SIZE
50ZH

FILTER
SiZE
(IN.)

1500

1600

0.04

030-042

24 x 24

0.14

0.15

1200

0.08

048,060

24 x 30

0.10

0.11

1400

0.08

1600

0.09

1400

0.07

1600

0.08

insulation,
wiring or air filter(s). For best results, spray outdoorcoil fins from inside to outside the unit. On units with an outer and

1800

0.09

inner outdoor

1700

0.07

flush all dirt and debris from

1800

0.08

2100

0.09

2300

0.10

Inspect

CFM
1700

1800

1900

2000

2100

2200

2300

0.12

0.13

0.14

0.15

0.18

0.17

0.18

coil, be sure 1o clean

between

the drain pan and condensate

drain line when

the coils. Clean the drain pan and condensate
lk_reign matter
clear

from

the pan.

water. Do not splash

the coils.

Be sure to

the unit base.

Flush

inspecting

drain by removing

the pan and drain

water on the insulation,

tube

motor,

all
with

wiring,

Table 7--Accessory

Check

Electric Heat Pressure Drop

0n. wg)
I

to ensure

no wires

are touching

sheet metal edges. Move
and sheet metal edges.

CFM

Al_er inspecting

and secure

the electrical

refrigerant

tubing

wires to isolate

controls

and wiring,

or sharp

l_'om tubing

replace

all the

"E"E°
"wI800
I800
11000112001140011600118001200012200
panels.

5-20

0.06

0.08

0.10

0.13

0.15

0.18

0.20

0.23

0.25

Start the unit,

cycle

to ensure

operating
or air filter(s).
"plumbers

If the

snake"

auxiliary

drain

tube

similar

drain port above

is restricted,

probe

clear

device.

it with

Ensure

that

each

a
the

Step 5--Outdoor

proper

Outdoor

cooling

unit. Damage

fan

l?'ee l?'om all obstructions

operation.

Never

place

articles

to ensure

on top of the

electrical
making

of Operation

check

instrumenta-

these checkouts.

section,

as an aid in

operation.

supply

outdoor-fan

leak-test

and install

assembly

and fan) by removing

screws

lockout

(grille,
and flipping

motor

assembly

cover,

onto unit

connections

Detecting

or if low

all refrigerant
solution.

If no refl'igeraut

leaks

indicates

perIkmnance

section.

leak-detector,

leak is detected,

(See Table

Charge.

relcr to Check

of Contents

are R)und and low cooling

reli:r to Rel?'igerant

a rel?'ig-

is suspected,

using an electronic

If a rel_'igerant

Leaks

and the unit base liar oil

oil generally

cooling

tubing

Ii)r Refl'igerant
number.)

suspected,

fan hub setscrews.

tubing

annually.

liquid-soap

tag.

motor,

Circuit

all rel}igerant

If oil is detected

top cover.
3. Loosen

control

7iRefrigerant

accunmlations
erant leak.

to unit may result.

1. Shut off unit power
2. Remove

proper

are observed

has occurred,

the proper

label when

cooling

Fan
Inspect

the

If discrepancies
malluuction

with

Reli3r to the Sequence

Step

Keep

component

to the unit wiring

determining

at least one complete

operation.

or if a suspected

electrical

NOTE:

the drain tube is also clear.

proper

cycle,

tion. Reli:r

and observe

(See Table

Ii)r page

perlbrmance

of Contents

li)r

page number.)
4. Adjust

fan height

as shown

5. Tighten

setscrews.

6. Replace

outdoor-fan

Step 6--Electrical
Inspect

and check

in Fig. 23 or 24.

Step 8--Indoor
The

assembly.

Controls

slu'e to tmw q_' rite electrical

airflow

perlk>rmance

and

the electrical

cooling

Wiring

controls

power

and wiring

annually.

to rite Httit and in.stall lockout

Airflow
does

not

require

checking

/[ a problem

is suspected.

.s'ltl)plx'- attd retur;l-air

grilles

attd that

the air.filter

is clean.

Airflow
airflow.

and Airflow

A_[justmeuts

unless

improper

eri,_t,_, be .s;uv, that all

are open and f}'(,e._}'om obstri¢ctions,
When

necessary,

section

relier to Indoor

to check

the

system

tag.
Remove

the top

wiring.

Check

screw

connections.

noticed,

panel

to locate

all electrical

disassemble

all the electrical

connections

If any

smoky

the connectiom

wire end and reassemble

controls

lk_r tightness.
or

clean

the connection

burned

Tighten

connections

9--Metering

the

Step

10--Lubrication

L'OMPRESSOR

3.125 in.

amount
FAN

C00021

Adjustment (030-048

MOTOR

motors

is required.
11--Liquid

and

Check

Step

}

12--High

(to protect

metering

in the liquid

are the larger

correct

bearings

of outdoor

are permaor indoor

fan

line

device)

is made of wire

on the inlet

side

of the

Flow

Valves

on the cou_pressor

Valves.

Large

with

()-rings

located

lk)r service

in the liquid lines near the strainers.
of the two components.

black

hot gas and suction
plastic

inside

the

in the field.

place and tight or the possibility

Adjustment (060 Size)

motor

lubrication

are also located

Flow

accessed

Fig. 24--Outdoor-Fan

the

device.
valves

Located

C02017

with

Line Strainer

is located

The Strainers

is charged

Fan

No lurtber

The liquid line strainer
metering

_..,

compressor

BEARINGS

lubricated.

Step

Size)

The

of oil at the factory.

nently

mesh

,....._flP

Check valves are also located in the liquid lines near the strainers.
The check valves are the smaller of the two components.

and securely.

I .......

Fig. 23--Outdoor-Fan

Devices

Rel?'igerant metering devices are fixed orilices and are located
the inlet header to the indoor and outdoor coils.

all
are

all the parts, restrip
properly

Step

and

caps
caps.
Ensure

tubes

distinguish
These

valves

the plastic

of reI_'igerant

leakage

are High

these

valves

cannot
caps

are in

could occur.

Open

Closed

Open

Closed
LEGEND

LCS

Loss of Charge

]

Acutrol

Switch

Check Valve (Arrow

Metering

Device
indicates

direction

of flow)
HEATING

CYCLE

1. Hot gas from compressor flows through the 4-way valve and is
directed to the cooling liquid line check valve. It is then condensed
and directed through subcooling circuits and out to the strainer
and the check valve in the heating liquid line.
2. The refrigerant then feeds the outdoor coil through the Acutrol
metering device on each circuit.

Fig. 25-Typical

3. Each circuit evaporates the refrigerant and the circuits are combined in the outdoor header with some of the circuits flowing th rough
the check valve.
4. The refrigerant then flows through the 4-way valve, accumulator,
and back to the compressor.

C95045

Heat Pump Operation, Heating Mode

OUTDOOR COIL

INDOOR COIL

LCS

Check Valves
A

Ck)sed

Open

Ck)sed

Open
LEGEND

LCS

Loss of Charge

]

Acutrol

Switch

Check Valve (Arrow

Metering

Device
indicates

direction

of flow)

COOLING
1. Hot gas from compressor flows through the 4-way valve and is
directed to the heating liquid line check valve. It is then condensed and subcooled through converging circuits. Refrigerant leaves
the outdoor coil by way of the strainer and the check valve in the
cooling liquid line.
2. The refrigerant then feeds the indoor coil thR)ugh the Acutrol
metering device on each circuit.

Fig. 26-Typical

CYCLE
3. Each circuit evaporates the refrigerant and the circuits are combined in the indoor coil header with some of the circuits flowing
through the check valve.
4. The refrigerant then flows through the 4-way valve, accumulator,
and back to the compressor.

C95044

Heat Pump Operation,
Balance

Cooling

Mode

Point Worksheet

80000

70000

60000

50000

eL)

S_
40000

30000
c
D

20000

10000

-10

Outdoor Air Temp (Deg F)
C01038rev2

Fig. 27-50ZH Balance
21

Point Chart

TabJe 8--TroubJeshooting--CooJing

and Heating

CAUSE

REMEDY

Power Failure

Call power company

SYMPTOM

Loss of Charge
Switch open

Evaluate unit for possible refrigerant

Fuse blown or circuit breaker tripped
Compressor

and outdoor

fan wiJl not start.

Defective thermostat, contractor,
control relay
Insufficient

transformer,

Replace fuse or reset circuit breaker
or

Compressor
Compressor

will

not start
runs.

but

outdoor

fan

Lower thermostat

in compressor

motor burned out, seized, or internal
overload open

Defective run/start capacitor
One leg of 3-phase

overload

start relay

power dead

Low input voltage
(20 percent low)
Refrigerant

overcharge

or undercharge

Blocked outdoor coil (cooling)
overload or start

Defective thermostat
Faulty outdoor-fan
Restriction

Compressor

operates

continuousJy.

system

set too low

Air in refrigerant

cause and replace

cause and correct

Recover refrigerant, evacuate system, and recharge to capacities shown on nameplate

cause

Determine

cause and correct

Determine

cause and correct

Determine

cause and replace

Replace
Locate restriction and remove

Decrease

Replace filter
load or increase unit size

Locate leak repair, and recharge

(heating)

Replace compressor
Check defrost time settings. Reset as necessary.
Check defrost temperature switch. Replace as necessary.
Recover refrigerant

system

evacuate
charge

system

outdoor coil dirty or restricted

Clean coil or remove restriction

Dirty air filter

Replace filter
Clean coil

Dirty outdoor coil
Refrigerant

overcharged

Outdoor

and re-

Recover excess refrigerant

head pressure.
Air in refrigerant

leak

Reset thermostat

charge

Leaking valves in compressor
Frosted outdoor coil with incorrect
defrost operation

Excessive

Determine

Replace thermostat

Dirty air filter
Unit undersized for load

Low refrigerant

cause

Replace fuse or reset circuit breaker
Determine cause

motor or capacitor

in refrigerant

Thermostat

Determine

Replace compressor

Replace and determine

line voltage

Defective run/start capacitor,
relay

Check wiring and repair or replace

Evaluate unit for possible refrigerant

Defective compressor
Insufficient

and rewire correctly

setting below room temperature

Determine

Loss of Charge
Switch open

Compressor
cycles
(other than normaJJy satisfying thermostat).

cause and correct

Check wiring diagram

setting too high

Faulty wiring or loose connections
circuit

Replace component
Determine

line voltage

Incorrect or faulty wiring
Thermostat

leak

Recover refrigerant

system

or indoor air restricted

evacuate
charge

Determine

system

and re-

cause and correct

or air is recirculating
Low refrigerant
Head pressure too low.

Compressor
Restriction

charge

Check for leaks, repair and recharge

valves leaking
in liquid tube

Check for source and eliminate

High heat load
Excessive

suction pressure.

Compressor
Refrigerant

valves leaking
overcharged

Metering
Suction

pressure

too low.

Temperature

area (cooling)

ambient below 40_'F (cooling)

Field-installed
Compressor
runs but
outdoor fan does not.

Check for leaks

indoor airflow (cooling)

too low in conditioned

Outdoor

Replace Filter

charge

device or low side restricted

Insufficient

filter-drier

restricted

Normally closed contacts on
defrost board open

Replace compressor
Recover excess refrigerant

Dirty air filter (cooling)
Low refrigerant

Replace compressor
Remove restriction

repair, and recharge

Remove source of restriction
Increase air quantity
Check filter- replace if necessary
Reset thermostat
Install low-ambient

kit

Replace
Check condition of relay on board.
Replace board if necessary.

START-UP

CHECKMST

(REMOVE AND STORE IN JOB FILE)
I. PRELiMiNARY

iNFORMATiON

Model No .............................................................................................................................................................
Serial No ..............................................................................................................................................................
Date ......................................................................................................................................................................
Technician

...........................................................................................................................................................

Customer Information(Name/Address)
II, PRE-START-UP

...........................................................................................................................................................

Verify that all packing materials have been removed from unit
Verify that condensate connection is installed per installation
Check all electrical connections and terminals for tightness
Check wire proximity

to refrigerant

instructions

tubes and sheet metal edges

Check that indoor (indoor) air filter is clean and in place
Verify that unit installation

is level

___ Check fan wheel propeller for location in housing and setscrew tightness
ill. START-UP
Supply Voltage: L1-L2
Compressor

L2-L3

Amps: L1 (C)

Indoor Fan Amps:
Mode

Outdoor Air Temperature:

Temperature:

Refrigerant

Suction

Refrigerant

Discharge

Cooling Supply Air:
PRESSURES-Cooling

L3(R)

Outdoor Fan Amps:

TEMPERATURE-Cooling
Return-Air

L3-L1

_ L2(S)

WB
WB

Mode
psig
Suction Line Temp*
psig
Discharge Tempt

TEMPERATURE-Heating

Mode
DB

Outdoor Air Temperature:
Return-Air

Cooling Supply Air:
PRESSURES-Heating
Refrigerant

Suction

Refrigerant

Discharge

Temperature:

WB
WB

Mode
psig
Suction Line Temp*
psig
Discharge Tempt

Verify Refrigerant

charge using charging tables

Verify that 3-phase scroll compressor
*Measured

is rotating in correct direction.

at suction inlet to compressor

1-Measured at liquid line leaving outdoor coil

2.3

2006 CARRIER

Manufacturer
reserves
Book 1 4
Tab
6 8
PC 101

Corp. * 7310 W. Morris St. • Indianapolis,
the right

to discontinue,
Printed in USA

IN 46231

or change at any time, specifications
Catalog

50ZH-6SI

or designs

without

notice
Pg 24

and without incurring

obligations.

2-06

Replaces:

New

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CARRIER Package Units(both Units Combined) Manual L0604601

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