CARRIER Package Units(both Units Combined) Manual L0801094

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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_rn to the Expertg

Installation
NOTE: Read
installation.

the entire

instruction

manual

before

NOTE:
Installer: Make sure the Owner's
Manual
Instructions
are left with the unit after installation.

starting

TABLE

SAFETY

RECEIVING

the

Service

OF CONTENTS

CONSIDERATIONS

INTRODUCTION

and

Page
1

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

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

AND INSTALLATION

Check Equipment

2
.................

2-9

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

Identify Unit ...................................
Inspect Shipment ................................
Provide Unit Support
..............................
Roof Curb .....................................

2
2
2
2

Slab Mount ....................................
Ground Mount
.................................

2
2

Provide Clearances
................................
Field Fabricate Ductwork
...........................

2
2

Rig and Place Unit ................................
Inspection
.....................................
Installation
.....................................

2
6
6

Use of Rigging Bracket ...........................
Connect Condensate Drain ..........................

7
7

Install Duct Connections

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

Connections

.....

8
8

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

Special Procedures
for 208v Operation
...............
Control Voltage Connections
.......................
Standard Connection
.............................
Transformer
PRE-START-UP
START-UP

9
9
9

Protection
...........................
..................................

9
10

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

Check for Refrigerant

Leaks

11-16
........................

Start-Up Adjustments
.............................
Checking Cooling Control Operation
Checking and Adjusting Refrigerant

11
11
11
11

...............
Charge ..........

Indoor Airflow and Airflow Adjustments
............
Cooling Sequence of Operation ....................
MAINTENANCE
...............................

17
17
17-19

Air Filter .......................................
Indoor Blower and Motor ..........................
Outdoor
Outdoor

Coil, Indoor Coil, and Condensate
Fan ....................................

Drain Pan

Electrical Controls and Wiring
......................
Refrigerant Circuit ................................
Indoor Airflow
..................................
Metering Devices
Thermostatic
Expansion Valve ....................
AccuRater _5 Piston .............................
TROUBLESHOOTING
START-UP

CHECKLIST

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

C99001

Fig. 1 - Unit 50SD

Configuring
Units for Downflow
(Vertical) Discharge
Install Electrical Connections
........................
High-Voltage

Instructions

....

SAFETY
Installation

and servicing

CONSIDERATIONS
of this equipment

can be hazardous

due to

mechanical and electrical components.
Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance
functions such
as cleaning and replacing air filters. All other operations must be
performed
equipment,

by trained service personnel.
When working on this
observe precautions
in the literature, on tags, and on

labels attached
to or shipped
precautions
that may apply.

with

the

unit

and

other

safety

Follow all safety codes. Installation must be in compliance
with
local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher
available. Read
these instructions thoroughly
and follow all warnings
included in literature and attached to the unit.

or cautions

18
18

Recognize

symbol

18
18

When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury. Understand
these signal
words: DANGER,
WARNING.
and CAUTION.
These words are

18
19
19
19
19
19
19

safety information.

This is the safety-alert

used with the safety-alert
symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal injury
or death. CAUTION
is used to identify unsafe practices which may
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.

SLAB

MOUNT

Place the unit on a solid, level concrete

ELECTRICAL
SHOCK
HAZARD
Failure
tofollowthiswarning
could
result
inpersonal
injury
ordeath.
Before
installing
orservicing
system,
always
turnoffmain
power
tosystem.
There
maybemore
thanonedisconnect
switch.
Turnoffaccessory
heater
power
switch
ifapplicable.

unit (See Fig. 7). Do not secure
required by local codes.
GROUND

INTRODUCTION
The50SD
packaged
airconditioner
isfullyself-contained
and
designed
foroutdoor
installation
(See
Fig.1).See
Fig.2and3for
unitdimensions.
Allunitsizes
have
discharge
openings
forboth
horizontal
anddownflow
configurations,
andarefactory
shipped
withalldownflow
ductopenings
covered.
Theunitmay
beinstalled
either
onarooftop,
ground-level
cement
slab,ordirectly
onthe
ground
iflocalcodes
permit.
(See
Fig.4forroofcurb
dimensions.)
RECEIVING
ANDINSTALLATION
Stepl--Check Equipment
IDENTIFY

UNIT

The unit model
informative
INSPECT

number

plate. Check

and serial number
this information

are printed
against

on the unit

shipping

papers.

SHIPMENT

of 4

the unit to the slab except

when

MOUNT

The unit may be installed

either on a slab or placed

directly

ground if local codes permit. Place the unit on level ground
with gravel for condensate discharge.
Step 3--Provide

PERSONAL
INJURYAND ENVIRONMENTAL
HAZARD
Failure
torelieve
system
pressure
couldresult
inpersonal
injuryand/or
death.
1.Relieve
pressure
and
recover
allrefrigerant
before
servicing
existing
equipment,
andbefore
finalunitdisposal.
Useall
service
portsandopenallflow-control
devices,
including
solenokl
valves.
2.Federal
regulations
require
thatyoudonotventrefrigerant
intotheatmosphere.
Recover
during
system
repair
orfinalunit
disposal.

pad that is a minimum

in. (102 mm) thick with 2 in. (51 ram) above grade. The slab should
extend approximately
2 in. beyond the casing on all 4 sides of the

on the

prepared

Clearances

The required minimum service clearances are shown in Fig. 2 and
3. Adequate ventilation and outdoor air must be provided.
The
outdoor fan draws air through the outdoor coil and discharges it
through the top fan grille. 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.
(1219 ram) above the unit top. The maximum horizontal extension
of a partial overhang must not exceed 48 in. (1219 ram).
IMPORTANT:

Do not restrict outdoor

either the outdoor-air
to compressor

airflow. An air restriction

inlet or the tim discharge

may be detrimental

life.

Do not place the unit where water, ice. or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting
or other combustible
materials.
Slab-mounted
units
should be at least 4 in. (102 mm) above the highest expected water
and runoff levels. Do not use unit if it has been under water.
Step 4_Field-Fabricate

Duetwork

Secure all ducts to roof curb and building
structure on vertical
discharge units. Do not connect ductwork to unit. For horizontal
applications,
unit is provided
with flanges
on the horizontal
openings. All ductwork
should be secured to the flanges. Insulate
and weatherproof
all external ductwork, joints, and roof openings
with counter
codes.

flashing

and mastic

in accordance

with

applicable

Ducts passing through an unconditioned
space nmst be insulated
and covered with a vapor barrier. If a plenum return is used on a
vertical unit. the return should be ducted through the roof deck to

Inspect for shipping damage while unit is still on shipping pallet. If
unit appears to be damaged or is torn loose from its anchorage, have

comply with applicable fire codes. A minimum
clearance is not
required around ductwork. Cabinet return- air static shall not exceed
-.25 in. wc.

it examined by transportation
inspectors before removaL Forward
claim papers directly to transportation
company. Manufacturer
is

Step 5--Rig

and Place Unit

not responsible
for any damage incurred in transit. Check all items
against shipping
list. Immediately
notify the nearest equipment

Rigging

and handling

reasons

due to the installation

distribution
office if any item is missing. To prevent loss or damage,
leave all parts in original packages until installation.

etc.).

Step 2--Provide
For hurricane
(Professional
ROOF

Unit Support
tie downs,

Engineering)

contact

distributor

Certificate

for details

and PE

if required.

CURB

Install accessou

roof curb in accordance

with instructions

shipped

with curb (See Fig. 4). Install insulation, cant strips, roofing,
flashing. Ductwork must be attached to curb.

and

IMPORTANT:
The gasketing of the unit to the roof curb is critical
for a water tight seal. Install gasketing material supplied with the
roof curb. Improperly

applied

gasketing

also can result in air leaks

and poor unit performance.
Curb should be level to within 1/4 in. (See Fig. 6). This is necessary
for unit drain to function properly.
Refer to accessory roof curb
installation instructions for additional information
as required.

of this equipment
location

can be hazardous
(roofs,

elevated

Only trained, qualified crane operators and ground
should handle and install this equipment.
When

working

with

this equipment,

observe

for many
structures.

support

precautions

staff

in the

literature, on tags, stickers, and labels attached to the equipment,
any other safety precautions
that might apply.

and

Training

but

for operators

not be limited

of the lifting equipment

should

include,

to, the following:

1. Application
of the lifter to the load, and adjustment
lifts to adapt to various sizes or kinds of loads.
2. Instruction

in any special operation

or precaution.

3. Condition of the load as it relates to operation
kit. such as balance, temperature,
etc.
Follow
gloves.

all applicable

safety

codes.

of the

Wear safety

of the lifting

shoes

and work

5461
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RIGHT SIDE VIEW

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REAR VIEW

HVAOunit

(NOTE

_11

/ 0,=4
'

Flashing

Wood

nailer*

field

,,,_%w _.<_

1tl

Elasl_ing

field

Wood

_od

nailer*
nailer*

I
_I::! i:_
I

Roofing

_nsulati°p

It_-;!_'_
II

rr, aterial

(field

IF_

'_e'd
s_Pp"e_- lC_J:!IIIL

Roof

Curb

lnsulati£p

(f!eld

sopp,,ed>

field -- -II: iitllL

for SmMI Cabinet

Roof

Note A: When unit mounting screw is used,
retainer bracket must also be used.

Curb for Large Cabinet

Note A: When unit mounting screw is used,
retainer bracket must also be used.

R/A
\
\

S/A

_Gasket
\

Insulated

Short
Support

around
duct

Gasket around

deck pan

outer edge X

Long
SuppoEt

\
Retu n opel_lrlg
(BXO)

A05308

UNIT

ODS CATALOG
NUMBER

B
IN. (aM)

CPRFCURBOO6AOO

8 (203)

11 (279)

16-1/2

(419)

28-3/4

(730)

30-3/8

(771)

44-5/16

(1126)

45-15/16

CPRFCURBOO7AOO

14 (356)

11 (279)

16-1/2

(419)

28-3/4

(730)

30-3/8

(771)

44-5/16

(1126)

45-15/16

CPRFCURBOO8AOO

8 (203)

16-3/18

(411)

17-3/8

(441)

40-1/4

(1022)

41-15/16

(1065)

44-7/16

(1129)

48 - 1/18

(1169)

CPRFCURBOO9AOO

14 (356)

16-3/16

(411)

17-3/8

(441)

40-1/4

(1022)

41-15/18

(1065)

44-7/16

(1129)

46-1/18

(1169)

be used

as well.

SIZE

50SD018-036
50SD042-060

D
IN. (MM)

C
IN. (MM)

E
IN. (MM)

A
IN. (aM)

F
IN. (MM)

iN.(MM)
(1167)
(1167)

NOTES:
[.

Roof

Seat

Dimensions

Dimension

Roof

Attach

Inadated

S. When

curb
strip

curb

lnust
nlusr

installed.
to unit

being

installed.

in ( ) are in millimeters.
is made

panels:
unit

as required,

are in inches.

dtlctwork

conditions.

be set tip for ullit being
be applied,

of 16
to curb

I in. thick

recruiting
This

gauge

screw

bracket

steel.

(flanges

of duct

fiberglass

rest on ctlrb),

1 lb. density.

is t_sed (see Note

is available

through

A)+ a retainer

bracket

must

This

bracket

Micrometl.

Fig. 4 - Roof

Curb

Dimensions

must

also be t_sed when

required

code

for hurricane

or seismic

2
MINIMUMHEIGHT: 36'

DETAIL A

UNITHEIGHT

SEE DETAIL

Aj
/

A05161

C00071b

CORNER
Unit

Unit

Unit Only
Weight
Corner
Weight 1
Corner

Weight 2
Corner
Weight 3
Corner

Weight 4

Rigging
Weight

Shipping
Weight

Fig. 5 - 50SD

Unit Corner

Weights

and Suggested

WEIGHTS

(LARGE

CABINET)

Rigging

INSPECTION
Prior to initial use. and at monthly intervals, all rigging equipment
and straps should be visually inspected for any damage, evidence of
wear, structural deformation,
or cracks. Particular attention should

t OPTIONAL

'41 II
}

be paid to excessive wear at hoist hooking points and load support
areas. Equipment or straps showing any kind of wear in these areas
must not be used and should be discarded.

}

ELECTRICAL

SHOCK

HAZARD
}

Failure to follow this warning
Dr death.

could result in personal

injury
EVAR COIL

COND

COIL
C99096

Before installing or servicing system, always turn off main
power to system.
There may be more than one disconnect
switch. Turn off accessory heater power switch if applicable.
Tag disconnect switch with a suitable warning label.

Fig. 7 - Slab Mounting

[;NIT

FALLING

Detail

HAZARD

Failure to follow this warning
or death.
Never stand beneath

rigged

could result in personal

injury

units or lift over people.

INSTALLATION
MAXIMUM ALLOWABLE
DIFFERENCE (in)
A-B

A-O

1/4

The

C99065

Fig. 6 - Unit Leveling

Tolerances

lifting/rigging

bracket

is engineered

installed on(y on Small Packaged Products.
used to rig/lift a Small Packaged
Product
elevated structures.

and

designed

to be

This bracket is to be
onto roofs or other

Step 6--Connect

PROPERTY
DAMAGE
HAZARD
Failure
to followthiswarning
couldresultin personal
injury/death
orproperty
damage.
Rigging
brackets
foroneunituseonly.When
removing
a
unitattheendofitsuseful
life,useanewsetofbrackets.
of Ri_gin_

Bracket

1. If applicable, remove unit from shipping carton. Leave top
shipping skid on the unit for use as a spreader bar to prevent
the rigging straps from damaging the unit. If the skid is not
available, use a spreader bar of sufficient length to protect the
unit from damage.
2. Remove

NOTE:

When

comply

with local codes and restrictions.

Model 50SD

installing

Drain

disposes

condensate

drain connection

of condensate

water through

a 3/4 in. NPT

fitting which exits through the base on the evaporator
side. See Fig. 2 & 3 for location.
Condensate

water can be drained

directly

be sure to

coil access

onto the roof in rooftop

installations
(where permitted)
or onto a gravel apron in ground
level installations. Install a field-supplied
condensate trap at end of
condensate
connection
to ensure proper drainage. Make sure that

USEOFRIGGING
BRACKET
Field Installation

Condensate

the outlet of the trap is at least 1 in. (25 mm) lower than the drain pan
condensate
connection
to prevent the pan from overflowing
(See
Fig. 8). When using a gravel apron, make sure it slopes away from
the unit.
Connect

a drain tube using a minimum

of 3/4 -in. PVC or 3/4 -in.

copper pipe (all field-supplied)
at the outlet end of the 2-in. trap. Do
not undersize the tube. Pitch the drain tube downward at a slope of

4 screws in unit corner posts.

3. Attach each of the 4 metal rigging brackets under the panel
rain lip (See Fig. 5). Use the screws removed in step 2 above
to secure the brackets to the unit.

at least 1-in. for every 10 ft of horizontal
run. Be sure to check the
drain tube for leaks. Prime trap at the beginning
of the cooling
season

start-up.

1" (25ram)

MIN.
TRAP

PROPERTY
Failure

DAMAGE

to follow

injury/death
Rigging
adequate

this warning

or property

bracket
lifting.

HAZARD

MUST

2" (50mm)

could

result

MIN.

in personal

damage.

099013

be under

the rain lip to provide

Fig. 8 - Condensate
Step 7--Install

Duct

Trap

Connections

The design and installation of the duct system must be in accordance
with the standards of the NFPA for installation of non-residence
type
PROPERTY

DAMAGE

HAZARD

Failure to follow
this warning
injury/death or property damage.

could

result

in personal

2. Attach
opposite

down approximately

30 degrees

from

straps of equal length to the rigging brackets
at
ends of the unit. Be sure straps are rated to hold the

systems,

NFPA

90A

local codes and ordinances.

supply- air registers,

and return air grilles

according
to
ASHRAE
(American
Society
of Heating,
Refrigeration,
and Air Conditioning
Engineers) recommendations.
The unit has duct flanges on the supply- and return-air
openings on
the side of the unit.
When designing

of Unit

1. Bend top of brackets
the corner posts.

and ventilating

type, NFPA 90B and/or

Select and size ductwork,

Do not strip screws when re-securing
the unit. If a screw is
stripped, replace the stripped one with a larger diameter screw
(included).
Ri_,ing/Liftin_,

air conditioning

residence

and installing

ductwork,

consider

the following:

1. All units should have field- supplied filters or accessory
rack
installed
in the return-air
side
of the
Recommended
sizes for filters are shown in Table 1.

filter
unit.

2. Avoid abrupt duct size increases and reductions.
Abrupt
change in duct size adversely affects air performance.

weight of the unit (See Fig. 5).
3. Attach

a clevis

of sufficient

strength

straps. Adjust the clevis location
with the ground.

in the middle

of the

to ensure unit is lifted level

4. After unit is securely in place detach rigging straps. Remove
corner posts screws, and rigging brackets
then reinstall
screws.

IMPORTANT:
unit to prevent
ensure

Use flexible
transmission

weather-tight

and

connectors
of vibration.
airtight

seal.

between

ductwork

Use suitable
When

and

gaskets

heat

electric

installed, use fireproof canvas (or similar heat resistant material)
connector
between
ductwork
and unit discharge
connection.
If
flexible duct is used. insert a sheet metal sleeve inside duct. Heat
resistant

duct connector

(or sheet metal sleeve)

must extend

24-in.

(610 mm) from electric heater element.

UNIT

FALLING

HAZARD

Failure to follow
this warning
injury/death or property damage.

could

result

in personal

When straps are taut. the clevis should be a minimum
(914 mm) above the unit top cover.
After the unit is placed
the top crating.

on the roof curb or mounting

of 36 in.

pad, remove

3. Size ductwork for cooling air quantity (cfm). The minimum
air quantity for proper electric heater operation
is listed in
Table 2. Heater limit switches may trip at air quantities below
those recommended.
4. Seal. insulate, and weatherproof
all external ductwork. Seal,
insulate and cover with a vapor barrier all ductwork passing
through conditioned
Air
Conditioning
(SMACNA)

spaces. Follow latest Sheet Metal and
Contractors
National
Association

and Air Conditioning

Contractors

(ACCA)
minimum
installation
standards
heating and air conditioning
systems.

Association
for residential

5. Secure all ducts to building

structure.

Flash, weatherproof,

and vibration-isolate
duct openings
in
according to good construction
practices.
CONFIGURING
DISCHARGE

UNITS

FOR

wall

DOWNFLOW

space, and use vapor

roof

Association
of America

(VERTICAL)

barrier

in accordance

of Sheet Metal and Air Conditioning

with latest issue

Contractors

(SMACNA)
and Air Conditioning
(ACCA)
minimum
installation

heating and air conditioning
building structure.

systems.

National

Contractors
standards
for

Secure

all ducts

Flash, weatherproof,
and vibration-isolate
all openings in
building structure in accordance
with local codes and good
ELECTRICAL

SHOCK

Failure to follow this warning
or death.
Before performing

building

HAZARD

service

could result in personal

or maintenance

injury

operations

on the

system, turn off main power to unit and install lockout
1. Open all electrical
starting

disconnects

and install lockout

practices.

tag.
tag before

any service work.

2. Removereturnductcover
four (4) connecting
Fig. 9 & 10).
3. To remove
connecting

locatedon

ductpanelbybreaking

tabs with screwdriver

and a hammer

(See

supply duct cover, break front and right side
tabs with a screwdriver
and a hammer. Push

louver down to break rear and left side tabs (See Fig. 9 & 10).
4. If unit ductwork is to be attached to vertical opening flanges
on the unit composite base (jackstand applications
only), do
so at this time. Collect ALL screws that were removed. Do
not leave screws on rooftop as permanent

damage

SUPP_
DUCT
OPENING

to the roof

C99011

may occur.

Fig. 9 - Supply

5. It is recommended
perimeter

RETURN
DUCT
OPEN{NG

that the unit base insulation

of the vertical

return-air

opening

unit base with aluminum tape. Applicable
require aluminum tape to prevent exposed
6. Cover both horizontal
from the accessory
watertight.
7. After completing

duct openings

Duct Opening

the

be secured to the
local codes
fiberglass.

may

with the duct covers

duct cover kit. Ensure opening

unit conversion,

around

and Return

perform

is air-and

all safety checks

and power up unit.
NOTE:The
accordance

design and installation
of the duct system must be in
with the standards
of the NFPA for installation
of

nonresidence-type

air conditioning

90A or residence-type,
ordinances.

NFPA

Adhere to the following
installing the duct system:

criteria

and ventilating
90B;

when

and/or

systems.
local

selecting,

NFPA

codes

and

sizing,

and

DUCT

COVERS

REMOVED

C99012

1. Units are shipped

for side shot installation.

Fig. 10 - Vertical Duct Cover

2. Select
and
size ductwork,
supply-air
registers,
and
return-air grilles according to American Society of Heating,
Refrigeration
and Air Conditioning
recommendations.

Engineers

gaskets

4. All units must have field-supplied
filters or accessory
rack
installed
in the return-air
side
of the
Recommended

sizes for filters are shown

Electrical

Connections

(ASHRAE)

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
ensure weather-tight
and airtight seal.

Step 8---Install

Removed

ELECTRICAL

SHOCK

HAZARD

to
Failure to follow this warning
or death.

filter
unit.

in Table 1.

5. Size all ductwork
for maximum
required airflow (either
heating or cooling) for unit being installed. Avoid abrupt
duct size increases or decreases or performance
may be
affected.
6. Adequately
insulate and weatherproof
all ductwork located
outdoors.
Insulate
ducts passing through unconditioned

could result in personal

injury

The unit cabinet must have an uninterrupted,
unbroken
electrical ground to minimize the possibility of personal injury
if an electrical fault should occur. This ground may consist of
an electrical wire connected
to the unit ground screw in the
control
compartment,
or conduit
approved
for electrical
ground when installed in accordance with NEC, ANSI/NFPA
American
National
Standards
Institute/National
Fire
Protection
Electrical

Association
(latest edition) (in Canada, Canadian
Code CSA C22.1) and local electrical codes.

SPECIAL
PROCEDURES
FOR208-VOPERATION
UNITCOMPONENT
DAMAGE
HAZARD
Failure
tofollow
thiscaution
mayresult
indamage
totheunit
being
installed.
1.Make
allelectrical
connections
inaccordance
withNEC
ANSI/NFPA
(latest
edition)
andlocalelectrical
codes
governing
suchwiring.In Canada,
all electrical
connections
mustbein accordance
withCSAstandard
C22.1
Canadian
Electrical
Code
Part1and
applicable
local
codes.
Refer
tounitwiringdiagram.
2.Useonlycopper
conductor
forconnections
between
field-supplied
electrical
disconnect
switch
andunit.DO
NOTUSEALUMINUM
WIRE.
3.Besure
that
high-voltage
power
tounitiswithinoperating
voltage
range
indicated
onunitrating
plate.
On3-phase
units,
ensure
phases
are
balanced
within2percent.
Consult
localpower
company
forcorrection
ofimproper
voltage
and/or
phase
imbalance.
4.Donotdamage
internal
components
when
drilling
through
anypanel
tomount
electrical
hardware,
conduit,
etc.
HIGH-VOLTAGE
CONNECTIONS
Theunit musthavea separate
electrical
service
with a
field-supplied,
waterproof
disconnect
switch
mounted
at,orwithin
sightfromtheunit.Refer
totheunitrating
plate.
NECandlocal
codes
formaximum
fuse/circuit
breaker
size
andminimum
circuit
amps
(ampacity)
forwiresizing.
Thefield-supplied
discnnnect
maybemounted
ontheunitover
the
high-voltage
inletholewhen
thestandard
power
and
low-voltage
entry
points
areused.
See
Fig.2and3foracceptable
location.
See
unitwiringlabelandFig.11forreference
when
making
high
voltageconnections.
Proceed
as followsto complete
the
high-voltage
connections
totheunit.
Single
phase
units:
1.Runthehigh-voltage
(L1,L2)andground
leadintothe
control
box.
2.Connect
ground
leadtochassis
ground
connection.
3.Locate
theblack
andyellow
wires
connected
tothelineside
ofthecontactor.
4.Connect
fieldL1toblack
wireconnected
to11terminal
of
thecompressor
contactor.
5.Connect
fieldwireL2toyellowwireconnected
to 23
terminal
ofthecompressor
contactor.
Three-phase
units:
1.Runthehigh-voltage
(L1,L2,L3)andground
leadintothe
control
box.
2.Connect
ground
leadtochassis
ground
connection.
3.Locate
theblack
andyellow
wires
connected
tothelineside
ofthecontactor.
4.Connect
fieldL1toblack
wireconnected
to11terminal
of
thecompressor
contactor.
5.Connect
fieldwireL3toyellowwireconnected
to13
terminal
ofthecompressor
contactor.
6.Connect
fieldwireL2tobluewirefromcompressor.

ELECTRICAL
SHOCK
HAZARD
Failure
tofollowthiswarning
could
result
inpersonal
injury
ordeath.
Make
sure
thatthepower
supply
totheunitisswitched
OFF
andlockout
taginstalled
before
making
anywiringchanges.
CONTROL
VOLTAGE
CONNECTIONS
Donotuse
anytype of power-stealing thermostat. Unit control
problems

may result.

Use no. 18 American

Wire

Gage (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 (30.5 m) from the unit (as measured along the control
voltage wires), use no. 16 AWG
minimum) wires.
STANDARD
Remove
grommet
grommet
running

insulated

(35 ° C

CONNECTION

knockout

the control

color-coded,

hole located in the electric heat panel adjacent

access

panel.

from the installer's
in the knockout
wire through

See Fig.

2 &: 3. Remove

the rubber

packet (included with unit) and install
opening.
Provide a drip loop before

panel.

Run the low-voltage

leads from the thermostat,

hole. and into unit low-voltage

through

the inlet

splice box.

Locate 18-gage
wires leaving control box. These low-voltage
connection leads can be identified by the cnlors red, green, yellow,
brown

(See Fig. 11).

NOTE:If

auxiliary

low voltage

electric

control

heat is installed,

there may be additional

wires.

Ensure the leads are long enough

to be routed into the low-voltage

splice box (located below right side of control box). Route leads
through hole in bottom of control box and make low-voltage
connections
(See Fig. 11). Secure all cut wires,
interfere with operation of unit.
TRANSFORMER
The transformer
a 30-secnnd

so that they do not

PROTECTION
is of the energy-limiting

overload

or shorted

type. It is set to withstand

secondary

HIGH VOLTAGE

POWER
LEADS
(SEE UNIT
WIRING
LABEL)

lc e,- -

condition.

- -- -

FIELD-SUPPLIED
FUSED DISCONNECT
CONTROLBOX

l i (THYEIRCNA

LOW-VOLTAGE
POWER LEADS _(SEE UNIT
WIRING LABEL)

® I/
SPLICE

BOX

LEGEND

Field Control-Voltage Wiring
Field High-Voltage Wiring
NOTE: Use blue wire for 3-phase units only,
099010

Fig. 11 - High-

and Control-Voltage

Connections

Table
UNIT

NO MINAL

CAPACITY

OPERATING

(ton)

WEIGHT

1--Physical

018
1-1/2
259
118

SIZE

(Ib,)

(kg)

Data=Unit

024
2
318
144

50SD

030

036

042

048

2-1/2

3 - 1/2

330

335

412

442

446

152

187

200

202

150

COMPRESSOR

Scroll

REFRIGERANT

(R-22)

Quantity

(Ib,)

(kg)
REFRIGERANT
PART

METERING

DEVICE

OUTDOOR

5.9

6.0

7.2

7.8

12.4

12.0

2.4

2.7

3.3

3,5

5,6

5.4

0.065

0.070

0.080

0.084

0.088

0.099

1 ,,.21

2...21

13,5

10.2

11.9

13.5

19.4

19,4

2200

2800

3000

3500

4200

(sq. ft.)

OUTDOOR

FAN

Nominal

Ofm

Diameter
HP

INDOOR

(RPM)

1/8

(825)

1/8

(825)

1/8

(825)

1/8

(825)

1/8

(825)

1/4 (1100)

1/4

(1100)

COIL

Rows...Fins/in.
Face

Area

INDOOR

Airflow

Size

(in,)

Size

(mm)

Motor

3,,.17
(sq. ft.)

3...17

3.7

3,7

3...17

4...17

3...17

3.7

5,7

4...17
5.7

BLOWER

Nominal

COIL

Area

Motor

AccuRater

EA35YD097
(in.)

Rows...Fins/in.
Face

5.3
TXV

NUMBER

ORIFICE

060

(Ofm)

600

800

10OO

1200

1400

1600

1750

10x10

11x10

254x254
(RPM)

RETURN-AIR

1/4

FILTERS

254x254

(825)

1/3

(1050)

254x254
1/3

(1050)

254x254
1/2

279x254

(1000)

1/2

279x254

(1075)

1/2

279x254

(1075)

1,0 (1040)

Throwaway

(in.)
20x20x1
24x30x1
24x36x1
(mm)
508x508x25
610x762x25
610x914x25
*Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration institute) rated cooling airflow or the heating airflow velocity
of 300 ft/mlnute for throwaway type. For permanent filters, f@low filter manufacturer's
recommendations
for filter size based on allowable face velocity. Air filter
pressure drop for non-standard
filters must not exceed 0.08 in. wc.

Table

2--Minimum

Airflow
Operation

for Safe Electric

Heater

3. Make the following

(Cfm)

a. Inspect for shipping
and handling
damages,
such
broken lines, loose parts, disconnected
wires, etc.

s,zE 018 o2410301o361o421o 8 1o6oI
Cfm

600

800

1000

1200

1400

1600

1750

electronic
refrigerant
Refrigerant

EXPLOSION,

ELECTRICAL

SHOCK

1. Follow
goggles
2. Relieve

recognized
safety practices
when checking or servicing
and recover all refrigerant

4. Do not
contains

4. Verify the following

5. To remove a component,
proceed as follows:
a. Shut off electrical
tag.

wear

System

goggles

c. Cut component
connecting
cutter and remove component
d. Carefully
unsweat remaining
necessary.
flame.

Oil can ignite

exposed

fan blade is correctly

sure that condensate

and

positioned

drain pan and trap are filled

proper drainage.

c. Make sure that all tools
have been removed.

and

and miscellaneous

MOTOR

//FAN

loose

parts

GRILLE

system

tubing with tubing
from unit.
tubing stubs when

when

or sharp

conditions:

with water to ensure

power to unit and install lockout

b. Relieve and reclaim all refrigerant
from
using both high- and low-pressure
ports.

tubing

in fan orifice (See Fig. 12).
b. Make

protective

refrigerant

If damaged
during
shipping
straighten fins with a fin comb.

a. Make sure that outdoor

while

use torch to remove any component.
oil and refrigerant under pressure.

section.

e. Inspect
coil fins.
handling, carefully

touching
or disturbing
anything inside terminal
box if
refrigerant leak is suspected around compressor
terminals.
connection

Leaks

d. Ensure wires do not touch
sheet metal edges.

injury

and wear protective
refrigerant system.
from system before

3. Never
attempt
to repair
soldered
refrigerant system is under pressure.

leak detector,
or liquid-soap
solution.
If a
leak is detected,
see following
Check for

c. Inspect all field- and factory-wiring
connections.
sure that connections
are completed
and tight.

HAZARD

Failure to follow this warning could result in personal
or death and/or property damage.

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

PRE- START- UP

FIRE,

inspections:

to torch

1/8" MAX BETWEEN
MOTOR
AND FAN HUB

MOTOR

SHAFT
C99009

Proceed

as follows

1. Remove

to inspect and prepare the unit for initial start- up:

all access panels.

2. Read and follow instructions
CAUTION.
shipped

Fig. 12 - Fan Blade Clearance

on all DANGER,

and INFORMATION

labels

WARNING.
attached

to, or

with unit.
10

START-UP
CHECK

FOR REFRIGERANT

Proceed

as follows

018 Model Only

LEAKS

to locate

and repair

a refrigerant

The charging chart (see Table
temperature
at given discharge

leak and to

temperatures.

charge the unit:

An accurate
subcooling
thermometer
and a gauge

1. Locate leak and make sure that refrigerant system pressure
has been relieved and reclaimed
from both high- and
low-pressure
2. Repair
NOTE:

accepted

practices.

Install a filter drier whenever

the system

Proceed

has been opened

for repair.
refrigerant

vapor to system and

4. Recnver
microns

refrigerant
from system
and
if no additional leaks are found.

5. Charge

unit

with

R-22

refrigerant,

evacuate

using

compensate

Complete
section

for internal

volume

AND MAKING
the

required

before

to 500

service

b. Liquid

any safety

devices

5. Using

when operating the unit. Do not operate the unit when the outdoor
temperature is below 40°F (4°C) (unless accessory low-ambient
kit
is installed). Do not rapid cycle the compressor.
Allow
between "on" cycles to prevent compressor
damage.
CHECKING

COOLING

Start and check
follows:

CONTROL

1. Place room thermostat

cooling

5 minutes

temperature

SYSTEM

switch

in OFF

in AUTO
temperature.

switch in COOL

position.
Observe

position

position.

NOTE:

oriented.
3-phase

Unit

must

power

the internal

checked

protector

to ensure

will shut off the compressor.

power leads to the unit must be reversed
turning backwards,

the difference

discharge

may be dramatically

pressures

CHECKING

AND ADJUSTING

Adjustment

REFRIGERANT

of the refrigerant

the unit is suspected
A refrigerant

of not having

charging

3-phase

rotation.

compressor

When

suction and

NOTE:

Allow

before checking

with R-22

IMPORTANT:
indicated
condition
insufficient

When

adjustment

very minimal.

to operate

or adjusting

the proper R-22

refrigerant

and

unless

evaluating

If a substantial

accurate

superheat

inaccurate

thermocouple

adequate

for this type of measurement.

Proceed

as follows:

4. Measure

charge.

caps from low-

of the service

refer to system

temperatures

for a minimum

readings

is a

Leaks section.

thermistor-type

and high-pressure

service

fittings.

c. Suction

of 10 minutes

the

refrigerant

adjustment

is indicated,

charge,

must always be
an abnormal

exists somewhere
in the cooling
system,
airflow across either coil or both coils.

such

temperature

(low-side)

pressures

stabilize.

the following:

ambient-air

b. Suction-tube
fitting.

charge.

factory charge

and record

a. Outdoor

to the outside

refrigerant

to the specified

the

3. Start unit and let run until system

label is attached

system

causing

2. Using hoses with valve core depressors,
attach low- and
high-pressure
gauge hoses to low- and high-pressure
service fittings, respectively.

CHARGE

charge is not required

label and tables shown
in cooling mode only.

(1.1°C)

060 Models

1. Remove

access panel.
The charging
and pressures

is more than 2°F

liquid line temperature.

lower than normal.

The refrigerant system is fully charged
is tested and factory sealed.
NOTE:

to correct

between

add

thermometer
and a gauge manifold are required when using the
superheat charging method for evaluating the unit charge. Do not
use mercury or small dial-type thermometers
because they are not

5 minutes,

The

liquid

temperatures.

compressor

within

with desired

The charging chart (see Table 5A) includes the required suction line
temperature
at given suction line pressures and outdoor ambient

are direction

proper

If not corrected

outdoor-air

of -+2°F (+/- 1.1°C),

leak, refer to the Check for Refrigerant

024 through

lead orientation.

compare

line temperature

if actual temperature

If the problem

refrigerant

and FAN switch

compressors

(psig).

Charts,"

Using a tolerance

lower than required

evaporator
blower motors start. Observe that compressor
and outdoor fan shut down when control setting is satisfied
and that indoor blower shuts down after 30 second fan time
scroll

actual liquid

refrigerant

Set cooling
control
below
room
that compressor,
condenser
fan, and

delay expires.
IMPORTANT:
Three-phase,

pressure

Charging

refrigerant if actual temperature
is more than 2°F (1.1°C)
higher than proper liquid line temperature,
or remove

Observe that blower motor starts when FAN switch is placed
in ON position and shuts down after 30 second fan time
delay expires when FAN switch is placed in AUTO position.
2. Place SYSTEM

(°F (°C) db).

(°F (°C).

(see Table 5).

6. Compare

operation

temperature

(high-side)

"Cooling

and let unit run until system

the following:

ambient-air

line temperature.

cnntrol

fittings.

temperature
(°F (°C) db) with the discharge line pressure
(psig) to determine
desired system operating
liquid line

OPERATION

the unit for proper

Mode

line temperature

c. Discharge

in the Pre-Start-Up

the unit. Do not jumper

service

respectively.

and record

a. Outdoor

of filter drier.

given

fittings,

4. Measure

and high-pressure

with valve core depressors,
attach low- and
gauge hoses to low- and high-pressure

3. Start unit in Cooling
pressures stabilize.

a volumetric

ADJUSTMENTS

procedures

starting

caps from low-

2. Using hoses
high-pressure

charging cylinder or accurate scale. Refer to unit rating plate
for required
charge. Be sure to add extra refrigerant
to
START-UP

thermistor-type
when using the

as follows:

1. Remove

3. Add a small charge of R-22
leak-test unit.

thermocouple
or
manifold are required

subcooling charging method for evaluating the unit charge. Do not
use mercury or small dial-type thermometers
because they are not
adequate for this type of measurement.

ports.

leak following

5) includes the required liquid line
line pressures and outdoor ambient

pressure

(°F (°C) db).

(°F (°C)) at low-side

(psig).

service

Table
3--Dry

Coil Air Delivery*

(Deduct

10%

Molor

Unit

Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM
Watts
CFM

Low 1
50SD0180
High
Low 1
Medium
High
Low
50SD030

Medium 1
High
Low

50SD036

Medium 1
High
Low

50SD042

Medium 1
High
Low

50SD048

Medium 1
High
Low 1

50SD060

Medium
High

Air

delivery

iFactory

values

shipped

are without

cooling

"NA"

= Not

allowed

Note:

Deduct

field

Horizontal

Discharge

Operation)

External Static Pressure (in. wc)
0.1
260
859
340
1064
311
935
411
1195
528
1484
311
935
411
1195
528
1484
439
1242
503
1320
641
1362
434
1282
560
1526
765
1860
627
1550
771
1796
969
2124
766
2027
673
2095
1012
2184

Speed

50SD024

for 208-Volt

air filter

and are for dry

0.2
243
775
326
948
309
885
405
1155
516
1421
309
885
405
1155
516
1421
429
1170
491
1244
627
1288
426
1241
548
1482
746
1805
617
1530
755
1771
941
2071
769
1960
849
2026
993
2109

coil (see Wet Coil Pressure

0.3
229
667
317
620
304
620
398
1100
509
1368
304
620
398
1100
509
1368
415
1089
479
1162
623
1205
422
1206
535
1437
730
1751
607
1493
734
1734
908
2000
754
1901
633
1962
981
2036
Drop

0.4
217
536
307
680
301
757
390
1028
492
1279
301
757
390
1028
492
1279
401
994
461
1081
609
1119
403
1160
526
1398
709
1685
584
1461
711
1687
887
1944
736
1821
815
1887
963
1963

0.5
209
382
300
528
286
686
379
957
477
1185
286
686
379
957
477
1185
395
917
450
1005
601
1033
404
1109
511
1344
690
1620
567
1414
690
1645
658
1876
722
1759
798
1817
948
1886

0.6
- - 294
364
290
583
357
868
467
1088
290
583
357
868
467
1088
380
837
436
897
588
933
390
1040
496
1281
664
1541
548
1361
665
1595
827
1811
705
1693
782
1748
927
1812

0.7

0.8

0.9

286
423
357
769
447
970
286
423
357
769
447
970
356
702
418
767
571
626
375
967
478
1205
642
1468
528
1320
639
1530
604
1735
684
1616
763
1679
904
1729

280
263
345
647
435
853
280
263
345
647
435
853
339
570
404
662
559
714
360
890
460
1125
624
1370
503
1250
607
1449
767
1647
656
1513
748
1583
886
1647

- -327
365
421
712
- -327
365
421
712
329
442
389
541
548
580
344
613
439
1029
600
1265
480
1177
572
1355
748
1555
616
1354
704
1439
846
1496

table).

speed

for heating
supplied

speed

air filter

pressure

drop

and wet coil presalre

Table

drop

to obtain

4--50SDWet

external

static

pressure

Coil Pressul_

available

for

ducting.

Drop (in. wc)

UNIT
SIZE

500

600

700

800

018

0.011

0.013

0.018

0.022

0.030

0.037

0.044

0.053

0.063

0.037

0.044

0.053
0.05

0.063
0.061

0.072
0.072

0.081
0.080

0.105
0.090

0.110

0,044

0.051

0,059

0.065

0,072

0.080

0,088

0.095

0,105

0.044

0.050

0.053

0.059

0.066

0.072

0.077

0.086

0.079

0.087

0.095

0.102

0.113

024
030
036
042
048

900

1000

STANDARD CFM (S.C.EM.)
1100
1200
1300
1400

060

1500

1600

1700

1800

1900

2000

0.123

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..........
csf_ ,, !_ ..............
2
3
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A07579

Fig. 14 - Wiring

Diagram

208/230-3-60

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TEI_NiNAi (UN_AI_KED)
SP[iC[
SPLICE L_AR_FD)
FACiORY WIRING
FiLLt COntROL _IRiNG

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CAP _
CAP 3
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ANY OF FiiE OR]G[NA[
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24, SPL [ i
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CONiACTOR
CAPAC]]OR, FAN
CAI_AC]{O_, CO_P
CAPACi[OR, i_DUCER
CO_PRESSO_ _OlOR
EOU_P_ENf
FUSE
G_OUNO
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H_ATER
INDOOR FAN _0iOR
OU]DOOii iA_ _0101_
O(JAORLJPi[ _ER_INA[
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[iN_ rELAY RELAY
iilEii_OSIAiiIEA[iNG
IIiA_SFOi_M_

,if

50565C,0369
i 40j
A07580

Fig. 15 - Wiring

Diagram

460-3-60

Table

.ode,,
Size

018

(24)

6.7

Required

Subcooling

Outdoor

I 85

°F

Ambient

(29)

12(6,7)

5--Cooling

Charging

Chart

(°C)

Temperature
(36)

12(6.7)

- 018 only

Required

106

Required
(41)

115

12(6,7)

Liquid

Line

Subcooling

(°F)

Pressure
6 II lOII
(psig)
II
134 I 71 I 88 I
141 I 74 I 6e I

(46)

12(6.7)

Temperature

for

a Specific

Subcooling

Required

(R-22)

Subcooling

(°C)
11

16 II 2o11
I I Pressure
(kPa)
3
61 I 56 II
924
22
54 I 5911
972 23

15
17

70
67

24
22

21
19

73 I

8211
68 II
1124

27
25

163 I 83 I 78 I

2O
22

179

79
73

32
30

29
27

26
24

156
146

80
77

75
72

1076
1020

1711
001311 7111 1269 33 31 23
187 I 92 I 37 I 82 I 77 II
196
1°3190133
1 30111361
33 32
20
214 I 101 I 98 I 91 I 38 II
1476 38
33
33
223
1lO4
199
194
13911
243 I 119 I 195 I 199 I 95 II
1676 43
41
38
89

206

233

107

102

1234
1179

1413

1606
1536

42
40

39
37

36
34

253
1113
1108
1103
1 9811 1744
43
42
39
274 I 119 I 114 I 109 I 104 II
1669
48
43
43
265
1192
1117
1112
11o7111965
30 47
44
3o9 I 128 I 123 I 118 I 113 I I
2130 53
51
48
321,131,123,191,113,,
2213
33
52
,9
I II134
I
I
I
264

116

111

106

101

1620

297

125

120

115

110

2048

331
346
359

Table

5A--Cooling

Charging

Chart

137
140

129

124

I 1321

127
130

135

= 024 through

119

2282

12211

2386
2475

58
60

56
57

53
54

125

060 only

Suction
LineTem_
ODTemp.
Suction
Line
Pressure
PSL_
52
54
56
59
61
64
67
70
73
76 79 82 85 89 92
(°F)
45
5t 55 60 64 69
53 57 62 66 70
55
53 57 62 66 71 75
65
56 61 66 71 76
75
53 58 63 67 72
85
95
105

50 53 57 60 64

1t5
125

49 52 55 58 6I
50 53 56 59
Suction
Line
Tem_

ODTemp.

(oc)
7
t3
18
24
29
35
41
46
52

Suction
LinePres_

361 370 387 405 423 442 462 482 502 523 544 566 589 612 636

11 13 I5
I2

18 21
I4 16 19 21
___:__I2 14 17 19 21 24
13 I6 I9 22 24
12 14 17 20
10 12 t4
10 12
9 1t
t0

_L_

22
17
14
13
1t

19
16 18
14 16
13 15
A05109

25
27
28
3O
32
33
35
37
38
4O
42
43
45
47
48
50
52

5. Using

Cooling

temperature

Charging

(°F

Charts

(°C) db) with

compare

the suction

(psig) to determine
desired system
temperature
(See Table 5A).
6. Compare

actual

suction-tube

thermostat.

At this point, the thermostat

thermostat
deenergize

terminal R to terminals Y and G. These open circuits
contactor coil C and relay coil TDR. The condenser and

operating

temperature

temperature.

outdoor-air
line pressure

Using

suction

with

line

compressor motors stop. After a 30-second
delay, the blower motor
stops. The unit is in a standby condition, waiting for the next call for

desired

a tolerance

cooling

-+3°F

NOTE:

lower than required

If the

problem

causing

refrigerant

leak. refer to Check

INDOOR

AIRFLOW

NOTE:

operation,

450 cfm for each 12.000
Table 3 shows cooling

through

units

are factory

to minimize

the

Chart.

Consult
contract.

your

local

dealer

being

grilles are open, free

injury

the lead connections

for low speed,

048 sizes, which are wired for medium

except

6--Color
Coding for Motor
Black = High Speed

AND UNIT

DAMAGE

HAZARD
injury

The ability
to properly
perform
maintenance
on 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 Owner's Manual.

HAZARD
could result in personal

INJURY

Failure to follow this warning could result in personal
or death and possible unit component
damage.

tag

of the

ELECTRICAL

SHOCK

Failure to follow
injury or death:

the 030

speed.

HAZARD

these warnings

could

result

1. Turn off electrical power to the unit before
maintenance
or service on this unit.

For color coding on the motor leads, see Table 6.
Table

and

unit, refer to Table 6, Troubleshooting

NOTE TO EQUIPMENT
OWNER:
about the availability of a maintenance

properly.

wired

performance,

static pressures.

for the system

Disconnect
electrical power to the unit and install lockout
before changing blower speed.

All 50SD

troubleshoot

PERSONAL

by changing

high

capacity.

and return-air

Failure to follow this warning
or death.

Airflow can be changed
blower motor.

is a

section.

airflow is 350 to

external

the airflow

and adjusted

SHOCK

readings

Leaks

continuing

possibility
of premature equipment
failure, periodic maintenance
must be performed on this equipment. This cooling unit should be
inspected at least once each year by a qualified service person. To

ADJUSTMENTS

at various

Be sure that all supply-

ELECTRICAL

inaccurate

Btuh of rated cooling

airflows

To ensure

temperature.

the recommended

Refer to this table to determine
installed.

from obstructions,

the

for Refrigerant

AND AIRFLOW

For cooling

NOTE:

suction-tube

from the room thermostat.
MAINTENANCE

(-+1.7°C), add refrigerant if actual temperature
is more than
3°F (1.7°C) higher than proper suction-tube
temperature, or
remove refrigerant if actual temperature
is more than 3°F
(1.7°C)

breaks the circuit between

Leads

2. Use extreme

caution

3. Never place anything
with the unit.

Blue = Medium Speed

when removing
combustible

in personal

performing

panels

any

and parts.

either on or in contact

Red = Low Speed
To change the speed of the indoor fan motor (IFM), remove the fan
motor speed leg lead from the time delay relay (TDR). This wire is
attached to terminal-3
of TDR for 3-phase units. To change the
speed, remove and replace with lead for desired blower motor speed.
Insulate the removed lead to avoid contact with chassis parts.
COOLING

SEQUENCE

UNIT

OF OPERATION

With the room thermostat SYSTEM switch in the COOL position
and the FAN switch in the AUTO position, the cooling sequence of
operation is as follov:s:
When the room temperature
rises to a point that is slightly above the
cooling control setting of the thermostat,
the thermostat completes
the circuit between thermostat terminal R to terminals Y and G.

OPERATION

HAZARD

Failure to follow this caution may result in equipment
or improper operation.

damage

Errors made when reconnecting
wires may cause
and
dangerous
operation.
Label
all wires
disconnecting
when servicing.

improper
prior
to

The minimum
follows:

maintenance

coil (C) (through unit wire Y) and time delay relay (TDR) (through
unit wire G) across the 24-v secondary of transformer (TRAY).

1. Inspect

air filter(s)

The normally

2. Inspect

indoor

coil, drain pan, and condensate

the circuit
through
compressor
motor (COMP)
to
(outdoor) fan motor (OFM). Both motors start instantly.

cooling

season

for cleanliness.

These completed

complete
condenser

circuits through

open contacts

The set of normally
complete
(IFM).
NOTE:
should

of energized

open contacts

the circuit through

the thermostat

contactor

of energized

evaporator

connect

blower

contactor

Once the compressor

has started

again until 5 minutes

fan motor

and then has stopped,

are as

each

(?lean

when

month.

or replace

4. Check

electrical
operation

connections
each

drain each

Clean when necessary.

3. Inspect blov:er motor and wheel for cleanliness
season. Clean when necessary.

proper

not be started

for this equipment

necessary.

relay TDR close and
(indoor)

requirements

for tightness

cooling

season.

each cooling

and controls
Service

for

when

necessary.

have elapsed.

5. Ensure electric wires are not
tubing or sharp metal edges.

The cooling cycle remains on until the room temperature
drops to
a point that is slightly below the cooling control setting of the room
17

in contact

with

refrigerant

AIR FILTER
IMPORTANT:
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
recommended
filter sizes.
Inspect

air

filter(s)

least

once

installed.

each

See Table

month

and

BLOWER

are pre-lubricated.

Do not attempt

Inspect

coil, evaporator

the condenser

COIL,

AND

CONDENSATE

coil, and condensate

drain

The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all

replace

obstructions,
including
weeds and shrubs,
airflow through the condenser coil.

that interfere

with the

Straighten bent fins with a fin comb. If coated with dirt or lint, clean
the coils with a vacuum cleaner, using the soft brush attachment. Be
careful not to bend the fins. If coated with oil or grease, clean the

AND MOTOR

NOTE: All motors
these motors.

INDOOR

pan at least once each year.

1 for

(throwaway-type)
or clean (cleanable-type)
at least twice during
each cooling
season and twice during the heating season,
or
whenever the filter becomes clogged with dust and lint.
INDOOR

OUTDOOR
COIL,
DRAIN PAN

to lubricate

coils with a mild detergent and water solution. Rinse coils with clear
water, using a garden hose. Be careful not to splash water on motors,
insulation, wiring, or air filter(s). For best results, spray condenser
coil fins from inside to outside the unit. On units with an outer and
inner condenser coil, be sure to clean between the coils. Be sure to
flush all dirt and debris from the unit base.

For longer life, operating economy, and continuing efficiency, clean
accumulated
dirt and grease from the blower wheel and motor
annually.

Inspect the drain pan and condensate

drain line when inspecting

the

coils. Clean the drain pan and condensate
drain by removing all
foreign matter from the pan. Flush the pan and drain trough with
clear water. Do not splash water on the insulation, motor, wiring, or
Failure to follow this warning
or death.

could result in personal

injury

air filter(s). If the drain trough is restricted,
snake" or similar probe device.

] Disconnect
ELECTRICALand tagSHOCK
electrical HAZARD
power to the unit before cleaning
and lubricating the blower motor and wheel.
To clean the blower
1. Remove

OUTDOOR

clear it with a "plumbers

FAN

motor and wheel:

and disassemble

a. Remove

blower

assembly

as follows:
UNIT

unit access panel.

b. Disconnect
Disconnect

motor lead from time delay relay (TDR).
yellow lead from terminal L2 of the contactor.

to follow

HAZARD

this caution

may result in damage

to unit

components.
Keep the condenser fan free from all obstructions
to ensure
proper cooling operation. Never place articles on top of the
unit.

c. On all units remove blower assembly from unit. Remove
screws securing blower to blower partition
and slide
assembly out. Be careful not to tear insulation
compartment.

OPERATION

Failure

in blower

1. Remove

6 screws holding

outdoor

grille and motor

to top

cover.

d. Ensure proper reassembly
motor in relation
e. Loosen
remove

housing

blower
before

wheel and
2. Turn motor/grille

disassembly.

expose

setscrew(s)
that secures wheel to motor shaft,
screws that secure motor mount brackets
to

housing,
housing.
2. Remove

by marking

to blower

and

slide

motor

and clean blower

wheel

a. Ensure proper reassembly
b. Lift wheel from housing.

and motor

mount

out

3. Inspect tire fan blades

When handling

blower wheel, be sure not to disturb
(clips) on blower wheel vanes.

5. When replacing

wheel orientation.

attachment.

with
Remove

d. Reassemble

vacuum

cleaner,

using

soft

7. Replace
ELECTRICAL

fan blade, position

and slide fan off

blade so that the hub is

the flat area on the motor shaft

grille.
CONTROLS

AND WIRING

brush
Inspect and check the electrical controls and wiring
sure to turn off the electrical power to the unit.

grease and oil with mild solvent.

wheel into housing.

annually.

Remove access panel to locate all the electrical controls and wiring.
Check all electrical connections
for tightness. Tighten all screw

e. Reassemble
motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part of
shaft.
f. Reinstall

on top cover

or bends.

loosen setscrew

6. Ensure that set screw engages
when tightening.

weights

c. Remove caked-on
dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations
from wheel
and housing

down

1/8 in. (3.2 mm) away from the motor end (1/8 in. of motor
shaft will be visible) (3.2 mm) (See Fig. 12).

and/or cleaning
balance

upside

for cracks

4. If fan needs to be removed,
motor shaft.

as follows:

by marking

assembly

fan blade.

connections.
disassemble

If any smoky or burned connections
the connection,
clean all the parts, re-strip

and reassemble

unit access panel.

After inspecting

3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during cooling

the connection
the electrical

properly
controls

are noticed.
the wire end

and securely.
and wiring,

replace

all the

panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies
are observed in
operating cycle, or if a suspected malfunction
has occurred, check

cycles.

each
electrical
instrumentation.
checks.

component
with
Refer to the unit wiring

the
proper
electrical
label when making these

REFRIGERANT
CIRCUIT
Inspect
allrefrigerant
tubing
connections
andtheunitbase
foroil
accumulation
annually.
Detecting
oil generally
indicates
a
refrigerant
leak.

INDOOR
AIRFLOW
Thecooling
airflowdoes
notrequire
checking
unless
improper
performance
is suspected.
If a problem
exists,
besurethatall
supplyandreturn-air
grilles
areopen
and
freefromobstructions.
andthattheairfilterisdean.
METERING
DEVICES
018 Model Onlv-TXV

EXPLOSION,
PERSONAL
INJURY
HAZARD
Failure
to followthiswarning
couldresultin property
damage,
personal
injuryordeath.
System
underpressure.
Relieve
pressure
andrecover
all
refrigerant
before
system
repair
orfinalunitdisposal.
Useall
service
portsandopenallflow-control
devices,
including
solenoid
valves.

This metering device is a hard shutoff, balance port TXV. The TXV
maintains a constant superheat at the evaporator
exit resulting in
higher overall system efficiency.
024 through
Refrigerant
distributor

If oilisdetected
orif lowperformance
issuspected,
leaktestall
refrigerant
tubing
using
anelectronic
leakdetector,
orliquid-soap
solution.
If a refrigerant
leakis detected,
referto Check
for
Refrigerant
Leaks
section.
Ifnorefrigerant
leaks
arefound
andlowperformance
issuspected,
refer
toChecking
andAdjusting
Refrigerant
Charge
section.

060 Models-AccuRater
metering
assembly

Piston

device is a fixed orifice and is located
to the indoor coil.

in the

TROUBLESHOOTING
Refer to the Troubleshooting
information.

Chart (Table 7) for troubleshooting

START-UP
Use the Start-Up

Checklist

CHECKLIST

at the back of this manual.

Table
7--Troubleshooting
Chart
SYMPTOM

Compressor

CAUSE

and outdoor fan will not start

REMEDY

Power failure

Call power company

Fuse blown sr circuit breaker tripped
Defective contactor, transformer, control relay, or highpressure, loss-of-charge
or low-pressure switch
Insufficient line voltage

Replace fuse sr reset circuit breaker

Incorrect or faulty wiring

Check wiring diagram and rewire correctly

Thermostat setting too low/too high
Faulty wiring or circuit
Loose connections in compressor
Compressor
Compressor
FUnS

win not

start

but

condenser

Three=phase scroll sompressor
pressure differential

fan

has a low

motor burned out, seized, or

head

One leg of 3-phase

Replace fuse or reset circuit breaker
Determine cause

power dead

Low input voltage (20 percent low)

Determine cause and correct

Scroll compressor

Correct the direction of rotation by reversing the
3-phase power leads to the unit

is rotating in the wrong direction

overcharge

or undercharge

Restriction in refrigerant system

Determine cause and replace
Replace
Locate restriction and remove

Dirty air filter
Unit undersized for load

Replace filter
Decrease load sr increase unit size

Thermostat temperature
Low refrigerant charge

set too low

Excessive

Suction

suction

low

pressure

pressure too low

Reset thermostat setting
Locate leak, repair, and recharge

Outdoor coil dirty or restricted

Recover refrigerant, evacuate system, and recharge
Clean coil or remove restriction

Dirty air filter
Dirty indoor or outdoor coil

Replace filter
Clean coil

Refrigerant

Recover excess

overcharged

pressure

too

evacuate system, and reshown on rating plate

Determine cause and correct

Indoor or outdoor air restricted
pressure

Recover refrigerant,
charge to capacities

Replace and determine cause
Determine cause and correct

Insufficient line voltage
Blocked outdoor coil

Air in system

Head

Determine cause

Determine cause and replace

Air in system

Excessive

setting

Replace compressor

Defective run/start capacitor, overload or start relay
Faulty outdoor fan motor or capacitor

operates continuously

Reset thermostat

Check wiring and repair or replace

Defective run capacitor, overload, or PTC (positive
temperature coefficient) thermistor

Defective compressor

Compressor

Determine cause and correct

internal overload open

Refrigerant

Compressor cycles (other than normally
satisfying)
cooling/heating sails

Replace component

or air short-cycling

Low refrigerant charge
Restriction in liquid tube
High heat load
Reversing valve hung up or leaking internally

refrigerant

Recover refrigerant, evacuate system, and recharge
Determine cause and correct
Check for leaks, repair and recharge
Remove restriction
Check for source and eliminate
Replace valve

Refrigerant overcharged
Dirty air filter

Recover excess
Replace filter

Low refrigerant

Check for leaks, repair and recharge
Remove source of restriction

charge

Metering device or low side restricted
Insufficient coil airflow

refrigerant

Check filter replace if necessary

Temperature too low in conditioned area
Outdoor ambient below 55°F

Reset thermostat setting
Install low-ambient kit

Filter drier restricted

Replace

START-UP CHECKLIST
(Remove and Store in Job File)
I. Preliminary
MODEL NO.:
SERIAL

information

NO.:

DATE:
TECHNICIAN:

li. PRE-START=UP
(Insert checkmark
in box as each item is completed)
) VERIFY THAT ALL PACKING MATERIALS
HAVE BEEN REMOVED
FROM
) REMOVE

ALL SHIPPING

HOLD

DOWN

BOLTS

AND

BRACKETS

UNIT

PER INSTALLATION

INSTRUCTIONS

) CHECK ALL ELECTRICAL
CONNECTIONS
AND TERMINALS
FOR TIGHTNESS
) CHECKTHAT
INDOOR
(EVAPORATOR)
AIR FILTER IS CLEAN AND IN PLACE
) VERIFY
( ) CHECK

THAT UNIT INSTALLATION
IS LEVEL
FAN WHEEL, AND PROPELLER
FOR LOCATION

IN HOUSING/ORIFICE

III. START-UP
ELECTRICAL
SUPPLY VOLTAGE
COMPRESSOR
AMPS
INDOOR
(EVAPORATOR)
TEMPERATURES

FAN AMPS
DB

OUTDOOR
(CONDENSER)
AIR TEMPERATURE
RETURN-AIR
TEMPERATURE
DB
COOLING
SUPPLY AIR
DB

PRESSURES
REFRIGERANT

SUCTION

REFRIGERANT

DISCHARGE

( ) VERIFY
*Measured
1-Measured

REFRIGERANT

PSIG

SUCTION

PSIG
CHARGE

USING

LINE TEMP*

DISCHARGE

CHARGING

TEMPt

CHARTS

at suction inlet to compressor
at liquid line leaving condenser.

AND SETSCREW

TIGHTNESS

2007 Carrier Corporation

Manufacturer

reserves

the right to change,

Printed

in the US.A.

at any time_ specifications

Edition
and design

without notice

Date:

07/07

and without obligation.

Catalog No: 50SD-7Sl
Replaces:

50SD-6SI

Source Exif Data:

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Page Mode                       : UseNone
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Create Date                     : Tue Mar 25 06:18:18 2008
Author                          : 
Title                           : 
Subject                         :

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CARRIER Package Units(both Units Combined) Manual L0801094

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