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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Installation Instructions

NOTE: Read the entire instruction manual before starting the

installation.

NOTE: Installer: Make sure the Owner's Manual and Service

Instructions are left with the unit after installation.

TABLE OF CONTENTS

Page

SAFETY CONSIDERATIONS ........................ 1

INTRODUCTION .................................. 2

RECEIVING AND INSTALLATION ................. 2-9

Check Equipment ................................. 2

Identify Unit ................................... 2

Inspect Shipment ................................ 2

Provide Unit Support .............................. 2

Roof Curb ..................................... 2

Slab Mount .................................... 2

Ground Mount ................................. 2

Provide Clearances ................................ 2

Field Fabricate Ductwork ........................... 2

Rig and Place Unit ................................ 2

Inspection ..................................... 6

Installation ..................................... 6

Use of Rigging Bracket ........................... 7

Connect Condensate Drain .......................... 7

Install Duct Connections ............................ 7

Configuring Units for Downflow (Vertical) Discharge ..... 8

Install Electrical Connections ........................ 8

High-Voltage Connections ........................ 9

Special Procedures for 208v Operation ............... 9

Control Voltage Connections ....................... 9

Standard Connection ............................. 9

Transformer Protection ........................... 9

PRE-START-UP .................................. 10

START-UP .................................... 11-16

Check for Refrigerant Leaks ........................ 11

Start-Up Adjustments ............................. 11

Checking Cooling Control Operation ............... 11

Checking and Adjusting Refrigerant Charge .......... 11

Indoor Airflow and Airflow Adjustments ............ 17

Cooling Sequence of Operation .................... 17

MAINTENANCE ............................... 17-19

Air Filter ....................................... 18

Indoor Blower and Motor .......................... 18

Outdoor Coil, Indoor Coil, and Condensate Drain Pan .... 18

Outdoor Fan .................................... 18

Electrical Controls and Wiring ...................... 18

Refrigerant Circuit ................................ 19

Indoor Airflow .................................. 19

Metering Devices

Thermostatic Expansion Valve .................... 19

AccuRater _5Piston ............................. 19

TROUBLESHOOTING ............................. 19

START-UP CHECKLIST ........................... 19

Fig. 1 - Unit 50SD

C99001

SAFETY CONSIDERATIONS

Installation and servicing 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 by trained service personnel. When working on this

equipment, observe precautions in the literature, on tags, and on

labels attached to or shipped with the unit and other safety

precautions that may apply.

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 or cautions

included in literature and attached to the unit.

Recognize safety information. This is the safety-alert symbol _.

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

used with the safety-alert symbol. DANGER identifies the most se-

rious 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 en-

hanced installation, reliability, or operation.

ELECTRICALSHOCKHAZARD

Failuretofollowthiswarningcouldresultinpersonalinjury

ordeath.

Beforeinstallingorservicingsystem,alwaysturnoffmain

powertosystem.Theremaybemorethanonedisconnect

switch.Turnoffaccessoryheaterpowerswitchifapplicable.

PERSONALINJURYAND ENVIRONMENTAL

HAZARD

Failuretorelievesystempressurecouldresultinpersonal

injuryand/ordeath.

1.Relievepressureandrecoverallrefrigerantbeforeservicing

existingequipment,andbeforefinalunitdisposal.Useall

serviceportsandopenallflow-controldevices,including

solenoklvalves.

2.Federalregulationsrequirethatyoudonotventrefrigerant

intotheatmosphere.Recoverduringsystemrepairorfinalunit

disposal.

INTRODUCTION

The50SDpackagedairconditionerisfullyself-containedand

designedforoutdoorinstallation(SeeFig.1).SeeFig.2and3for

unitdimensions.Allunitsizeshavedischargeopeningsforboth

horizontalanddownflowconfigurations,andarefactoryshipped

withalldownflowductopeningscovered.Theunitmaybeinstalled

eitheronarooftop,ground-levelcementslab,ordirectlyonthe

groundiflocalcodespermit.(SeeFig.4forroofcurbdimensions.)

RECEIVINGANDINSTALLATION

Stepl--Check Equipment

IDENTIFY UNIT

The unit model number and serial number are printed on the unit

informative plate. Check this information against shipping papers.

INSPECT SHIPMENT

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

it examined by transportation inspectors before removaL Forward

claim papers directly to transportation company. Manufacturer is

not responsible for any damage incurred in transit. Check all items

against shipping list. Immediately notify the nearest equipment

distribution office if any item is missing. To prevent loss or damage,

leave all parts in original packages until installation.

Step 2--Provide Unit Support

For hurricane tie downs, contact distributor for details and PE

(Professional Engineering) Certificate if required.

ROOF CURB

Install accessou roof curb in accordance with instructions shipped

with curb (See Fig. 4). Install insulation, cant strips, roofing, and

flashing. Ductwork must be attached to curb.

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.

SLAB MOUNT

Place the unit on a solid, level concrete pad that is a minimum of 4

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

unit (See Fig. 7). Do not secure the unit to the slab except when

required by local codes.

GROUND MOUNT

The unit may be installed either on a slab or placed directly on the

ground if local codes permit. Place the unit on level ground prepared

with gravel for condensate discharge.

Step 3--Provide 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 apartial overhang (such as a normal house overhang) is 48 in.

(1219 ram) above the unit top. The maximum horizontal extension

of apartial overhang must not exceed 48 in. (1219 ram).

IMPORTANT: Do not restrict outdoor airflow. An air restriction at

either the outdoor-air inlet or the tim discharge may be detrimental

to compressor 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 flashing and mastic in accordance with applicable

codes.

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

comply with applicable fire codes. A minimum clearance is not

required around ductwork. Cabinet return- air static shall not exceed

-.25 in. wc.

Step 5--Rig and Place Unit

Rigging and handling of this equipment can be hazardous for many

reasons due to the installation location (roofs, elevated structures.

etc.).

Only trained, qualified crane operators and ground support staff

should handle and install this equipment.

When working with this equipment, observe precautions in the

literature, on tags, stickers, and labels attached to the equipment, and

any other safety precautions that might apply.

Training for operators of the lifting equipment should include, but

not be limited to, the following:

1. Application of the lifter to the load, and adjustment of the

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 of the lifting

kit. such as balance, temperature, etc.

Follow all applicable safety codes. Wear safety shoes and work

gloves.

I-4

tSl

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SERVICE PORTS

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HVAOunit

/(NOTE A) _11

/0,=4

' Wood nailer*

/Flashing field

I_I::!i:_ _nsulati°p (field

I Roofing rr, aterial It_-;!_'_II sopp,,ed>

/ '_e'ds_Pp"e_- lC_J:!IIIL

Roof Curb for SmMI Cabinet

Note A: When unit mounting screw is used,

retainer bracket must also be used.

/ ,,,_%w _.<_

i 1tl

' Wood nailer*

/Elasl_ing field _od nailer*

IF_ /lnsulati£p (f!eld

\ field -- -II: iitllL

Roof Curb for Large Cabinet

Note A: When unit mounting screw is used,

retainer bracket must also be used. /

Retu n opel_lrlg

(BXO)

Long

SuppoEt

Short

Support

R/A

\\ _Gasket around

\\ duct

S/A

Insulated Gasket around

deck pan outer edge X

UNIT SIZE

50SD018-036

50SD042-060

NOTES:

ODS CATALOG A B

NUMBER IN. (aM) IN. (aM)

CPRFCURBOO6AOO 8 (203) 11 (279)

CPRFCURBOO7AOO 14 (356) 11 (279)

CPRFCURBOO8AOO 8 (203) 16-3/18 (411)

CPRFCURBOO9AOO 14 (356) 16-3/16 (411)

[. Roof curb lnust be set tip for ullit being installed.

IN. (MM)

16-1/2 (419)

17-3/8 (441)

IN. (MM)

28-3/4 (730)

40-1/4 (1022)

IN. (MM)

30-3/8 (771)

41-15/16 (1065)

41-15/18 (1065)

IN. (MM)

44-5/16 (1126)

44-7/16 (1129)

A05308

iN.(MM)

45-15/16 (1167)

48 - 1/18 (1169)

46-1/18 (1169)

2. Seat strip nlusr be applied, as required, to unit being installed.

3. Dimensions are in inches.

4. Dimension in ( ) are in millimeters.

5. Roof curb is made of 16 gauge steel.

6. Attach dtlctwork to curb (flanges of duct rest on ctlrb),

7. Inadated panels: I in. thick fiberglass 1 lb. density.

S. When unit recruiting screw is t_sed (see Note A)+ a retainer bracket must be used as well. This bracket must also be t_sed when required by code for hurricane or seismic

conditions. This bracket is available through Micrometl.

Fig. 4 - Roof Curb Dimensions

1 2

C00071b

DETAIL A

SEE DETAIL Aj

MINIMUMHEIGHT: 36'

UNITHEIGHT

A05161

Unit

Unit Only

Weight

Corner

Weight 1

Corner

Weight 2

Corner

Weight 3

Corner

Weight 4

Rigging

Weight

Shipping

Weight

CORNER WEIGHTS (LARGE CABINET)

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 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

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 could result in personal injury

Drdeath.

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.

MAXIMUM ALLOWABLE

DIFFERENCE (in)

A-B A-O

1/4 1/4

Fig. 6 -Unit Leveling Tolerances

C99065

EVAR COIL COND COIL

Fig. 7 - Slab Mounting Detail

tOPTIONAL '41 II

}

C99096

[;NIT FALLING HAZARD

Failure to follow this warning could result in personal injury

or death.

Never stand beneath rigged units or lift over people.

INSTALLATION

The lifting/rigging bracket is engineered and designed to be

installed on(y on Small Packaged Products. This bracket is to be

used to rig/lift aSmall Packaged Product onto roofs or other

elevated structures.

PROPERTYDAMAGEHAZARD

Failureto followthiswarningcouldresultinpersonal

injury/deathorpropertydamage.

Riggingbracketsforoneunituseonly.Whenremovinga

unitattheendofitsusefullife,useanewsetofbrackets.

USEOFRIGGINGBRACKET

Field Installation 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 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.

PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in personal

injury/death or property damage.

Rigging bracket MUST be under the rain lip to provide

adequate lifting.

PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in personal

injury/death or property damage.

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_, of Unit

1. Bend top of brackets down approximately 30 degrees from

the corner posts.

2. Attach straps of equal length to the rigging brackets at

opposite ends of the unit. Be sure straps are rated to hold the

weight of the unit (See Fig. 5).

3. Attach a clevis of sufficient strength in the middle of the

straps. Adjust the clevis location to ensure unit is lifted level

with the ground.

4. After unit is securely in place detach rigging straps. Remove

corner posts screws, and rigging brackets then reinstall

screws.

UNIT FALLING HAZARD

Failure to follow this warning could result in personal

injury/death or property damage.

When straps are taut. the clevis should be a minimum of 36 in.

(914 mm) above the unit top cover.

After the unit is placed on the roof curb or mounting pad, remove

the top crating.

Step 6--Connect Condensate Drain

NOTE: When installing condensate drain connection be sure to

comply with local codes and restrictions.

Model 50SD disposes of condensate water through a 3/4 in. NPT

fitting which exits through the base on the evaporator coil access

side. See Fig. 2 & 3 for location.

Condensate water can be drained directly 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

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

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

2" (50mm) MIN.

099013

Fig. 8 - Condensate Trap

Step 7--Install Duct 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 air conditioning and ventilating systems, NFPA 90A or

residence type, NFPA 90B and/or local codes and ordinances.

Select and size ductwork, 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 and installing ductwork, consider the following:

1. All units should have field- supplied filters or accessory filter

rack installed in the return-air side of the unit.

Recommended sizes for filters are shown in Table 1.

2. Avoid abrupt duct size increases and reductions. Abrupt

change in duct size adversely affects air performance.

IMPORTANT: Use flexible connectors between ductwork and

unit to prevent transmission of vibration. Use suitable gaskets to

ensure weather-tight and airtight seal. When electric heat is

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.

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 spaces. Follow latest Sheet Metal and

Air Conditioning Contractors National Association

(SMACNA) and Air Conditioning Contractors Association

(ACCA) minimum installation standards for residential

heating and air conditioning systems.

5. Secure all ducts to building structure. Flash, weatherproof,

and vibration-isolate duct openings in wall or roof

according to good construction practices.

CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)

DISCHARGE

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Before performing service or maintenance operations on the

system, turn off main power to unit and install lockout tag.

1. Open all electrical disconnects and install lockout tag before

starting any service work.

2. Removereturnductcover locatedon ductpanelbybreaking

four (4) connecting tabs with screwdriver and a hammer (See

Fig. 9 & 10).

3. To remove supply duct cover, break front and right side

connecting 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 to the roof

may occur.

5. It is recommended that the unit base insulation around the

perimeter of the vertical return-air opening be secured to the

unit base with aluminum tape. Applicable local codes may

require aluminum tape to prevent exposed fiberglass.

6. Cover both horizontal duct openings with the duct covers

from the accessory duct cover kit. Ensure opening is air-and

watertight.

7. After completing unit conversion, perform all safety checks

and power up unit.

NOTE:The design and installation of the duct system must be in

accordance with the standards of the NFPA for installation of

nonresidence-type air conditioning and ventilating systems. NFPA

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

ordinances.

Adhere to the following criteria when selecting, sizing, and

installing the duct system:

1. Units are shipped for side shot installation.

2. Select and size ductwork, supply-air registers, and

return-air grilles according to American Society of Heating,

Refrigeration and Air Conditioning Engineers (ASHRAE)

recommendations.

3. Use flexible transition between rigid ductwork and unit to

prevent transmission of vibration. The transition may be

screwed or bolted to duct flanges. Use suitable gaskets to

ensure weather-tight and airtight seal.

4. All units must have field-supplied filters or accessory filter

rack installed in the return-air side of the unit.

Recommended sizes for filters are shown 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

space, and use vapor barrier in accordance with latest issue

of Sheet Metal and Air Conditioning Contractors National

Association (SMACNA) and Air Conditioning Contractors

of America (ACCA) minimum installation standards for

heating and air conditioning systems. Secure all ducts to

building structure.

Flash, weatherproof, and vibration-isolate all openings in

building structure in accordance with local codes and good

building practices.

SUPP_ RETURN

DUCT DUCT

OPENING OPEN{NG

Fig. 9- Supply and Return Duct Opening

C99011

DUCT COVERS REMOVED

Fig. 10 - Vertical Duct Cover Removed

Step 8---Install Electrical Connections

C99012

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

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 Association (latest edition) (in Canada, Canadian

Electrical Code CSA C22.1) and local electrical codes.

UNITCOMPONENTDAMAGEHAZARD

Failuretofollowthiscautionmayresultindamagetotheunit

beinginstalled.

1.MakeallelectricalconnectionsinaccordancewithNEC

ANSI/NFPA(latestedition)andlocalelectricalcodes

governingsuchwiring.In Canada,all electrical

connectionsmustbeinaccordancewithCSAstandard

C22.1CanadianElectricalCodePart1andapplicablelocal

codes.Refertounitwiringdiagram.

2.Useonlycopperconductorforconnectionsbetween

field-suppliedelectricaldisconnectswitchandunit.DO

NOTUSEALUMINUMWIRE.

3.Besurethathigh-voltagepowertounitiswithinoperating

voltagerangeindicatedonunitratingplate.On3-phase

units,ensurephasesarebalancedwithin2percent.Consult

localpowercompanyforcorrectionofimpropervoltage

and/orphaseimbalance.

4.Donotdamageinternalcomponentswhendrillingthrough

anypaneltomountelectricalhardware,conduit,etc.

HIGH-VOLTAGECONNECTIONS

Theunitmusthavea separateelectricalservicewitha

field-supplied,waterproofdisconnectswitchmountedat,orwithin

sightfromtheunit.Refertotheunitratingplate.NECandlocal

codesformaximumfuse/circuitbreakersizeandminimumcircuit

amps(ampacity)forwiresizing.

Thefield-supplieddiscnnnectmaybemountedontheunitoverthe

high-voltageinletholewhenthestandardpowerandlow-voltage

entrypointsareused.SeeFig.2and3foracceptablelocation.

SeeunitwiringlabelandFig.11forreferencewhenmakinghigh

voltageconnections.Proceedasfollowsto completethe

high-voltageconnectionstotheunit.

Singlephaseunits:

1.Runthehigh-voltage(L1,L2)andgroundleadintothe

controlbox.

2.Connectgroundleadtochassisgroundconnection.

3.Locatetheblackandyellowwiresconnectedtothelineside

ofthecontactor.

4.ConnectfieldL1toblackwireconnectedto11terminalof

thecompressorcontactor.

5.ConnectfieldwireL2toyellowwireconnectedto 23

terminalofthecompressorcontactor.

Three-phaseunits:

1.Runthehigh-voltage(L1,L2,L3)andgroundleadintothe

controlbox.

2.Connectgroundleadtochassisgroundconnection.

3.Locatetheblackandyellowwiresconnectedtothelineside

ofthecontactor.

4.ConnectfieldL1toblackwireconnectedto11terminalof

thecompressorcontactor.

5.ConnectfieldwireL3toyellowwireconnectedto13

terminalofthecompressorcontactor.

6.ConnectfieldwireL2tobluewirefromcompressor.

SPECIALPROCEDURESFOR208-VOPERATION

ELECTRICALSHOCKHAZARD

Failuretofollowthiswarningcouldresultinpersonalinjury

ordeath.

MakesurethatthepowersupplytotheunitisswitchedOFF

andlockouttaginstalledbeforemakinganywiringchanges.

CONTROLVOLTAGECONNECTIONS

Donotuseanytype 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 color-coded, insulated (35 ° C

minimum) wires.

STANDARD CONNECTION

Remove knockout hole located in the electric heat panel adjacent to

the control access panel. See Fig. 2 &: 3. Remove the rubber

grommet from the installer's packet (included with unit) and install

grommet in the knockout opening. Provide a drip loop before

running wire through panel.

Run the low-voltage leads from the thermostat, through the inlet

hole. and into unit low-voltage 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 electric heat is installed, there may be additional

low voltage control 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, so that they do not

interfere with operation of unit.

TRANSFORMER PROTECTION

The transformer is of the energy-limiting type. It is set to withstand

a 30-secnnd overload or shorted secondary condition.

HIGH VOLTAGE r --- -

POWER LEADS lc e,- ----

(SEE UNIT WIRING

LABEL) _ ---

CONTROLBOX

LOW-VOLTAGE

POWER LEADS _-

(SEE UNIT

WIRING LABEL)

SPLICE BOX

LEGEND

FIELD-SUPPLIED

FUSED DISCONNECT

l i (THYEIRCNA° TAT

® I/

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

018 024

1-1/2 2

259 318

118 144

1--Physical Data=Unit 50SD

030 036

2-1/2 3

330 335

150

UNIT SIZE 042 048 060

NO MINAL CAPACITY (ton) 3 - 1/2 4 5

OPERATING WEIGHT (Ib,) 412 442 446

(kg) 152 187 200 202

COMPRESSOR Scroll

REFRIGERANT (R-22) Quantity (Ib,) 5.3 5.9 6.0 7.2 7.8 12.4 12.0

(kg) 2.4 2.7 2.7 3.3 3,5 5,6 5.4

REFRIGERANT METERING DEVICE TXV AccuRater '_

PART NUMBER EA35YD097

ORIFICE OD (in.) NA 0.065 0.070 0.080 0.084 0.088 0.099

OUTDOOR COIL

Rows...Fins/in. 1 ,,.21 2...21 2...21 2...21 2...21 2...21 2...21

Face Area (sq. ft.) 13,5 10.2 11.9 13.5 19.4 19.4 19,4

OUTDOOR FAN

Nominal Ofm 2200 2200 2800 3000 3500 3500 4200

Diameter 22 22 22 22 22 22 22

Motor HP (RPM) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/4 (1100) 1/4 (1100)

INDOOR COIL

Rows...Fins/in. 3,,.17 3...17 3...17 4...17 3...17 3...17 4...17

Face Area (sq. ft.) 3.7 3,7 3.7 3.7 5,7 5,7 5.7

INDOOR BLOWER

Nominal Airflow (Ofm) 600 800 10OO 1200 1400 1600 1750

Size (in,) 10x10 10x10 10x10 10x10 11x10 11x10 11x10

Size (mm) 254x254 254x254 254x254 254x254 279x254 279x254 279x254

Motor HP (RPM) 1/4 (825) 1/3 (1050) 1/3 (1050) 1/2 (1000) 1/2 (1075) 1/2 (1075) 1,0 (1040)

RETURN-AIR FILTERS 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 for Safe Electric Heater

Operation (Cfm)

s,zE 018 o2410301o361o421o 81o6oI

Cfm 600 800 1000 1200 1400 1600 1750

PRE- START- UP

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death and/or property damage.

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

2. Relieve and recover all refrigerant from system before

touching or disturbing anything inside terminal box if

refrigerant leak is suspected around compressor terminals.

3. Never attempt to repair soldered connection while

refrigerant system is under pressure.

4. Do not use torch to remove any component. System

contains oil and refrigerant under pressure.

5. To remove a component, wear protective goggles and

proceed as follows:

a. Shut off electrical power to unit and install lockout

tag.

b. Relieve and reclaim all refrigerant from system

using both high- and low-pressure ports.

c. Cut component connecting tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch

flame.

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

1. Remove all access panels.

2. Read and follow instructions on all DANGER, WARNING.

CAUTION. and INFORMATION labels attached to, or

shipped with unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages, such as

broken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and on

unit base. Detecting oil generally indicates a refrigerant

leak. Leak test all refrigerant tubing connections using

electronic leak detector, or liquid-soap solution. If a

refrigerant leak is detected, see following Check for

Refrigerant Leaks section.

c. Inspect all field- and factory-wiring connections. Be

sure that connections are completed and tight.

d. Ensure wires do not touch refrigerant tubing or sharp

sheet metal edges.

e. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following conditions:

a. Make sure that outdoor fan blade is correctly positioned

in fan orifice (See Fig. 12).

b. Make sure that condensate drain pan and trap are filled

with water to ensure proper drainage.

c. Make sure that all tools and miscellaneous loose parts

have been removed.

MOTOR //FAN GRILLE

1/8" MAX BETWEEN

MOTOR AND FAN HUB MOTOR SHAFT

Fig. 12 - Fan Blade Clearance

C99009

START-UP

CHECK FOR REFRIGERANT LEAKS

Proceed as follows to locate and repair a refrigerant leak and to

charge the unit:

1. Locate leak and make sure that refrigerant system pressure

has been relieved and reclaimed from both high- and

low-pressure ports.

2. Repair leak following accepted practices.

NOTE: Install a filter drier whenever the system has been opened

for repair.

3. Add a small charge of R-22 refrigerant vapor to system and

leak-test unit.

4. Recnver refrigerant from system and evacuate to 500

microns if no additional leaks are found.

5. Charge unit with R-22 refrigerant, using a volumetric

charging cylinder or accurate scale. Refer to unit rating plate

for required charge. Be sure to add extra refrigerant to

compensate for internal volume of filter drier.

START-UP AND MAKING ADJUSTMENTS

Complete the required procedures given in the Pre-Start-Up

section before starting the unit. Do not jumper any safety devices

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 5 minutes

between "on" cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit for proper cooling cnntrol operation as

follows:

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 after 30 second fan time

delay expires when FAN switch is placed in AUTO position.

2. Place SYSTEM switch in COOL position and FAN switch

in AUTO position. Set cooling control below room

temperature. Observe that compressor, condenser fan, and

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

delay expires.

IMPORTANT: Three-phase, scroll compressors are direction

oriented. Unit must be checked to ensure proper compressor

3-phase power lead orientation. If not corrected within 5 minutes,

the internal protector will shut off the compressor. The 3-phase

power leads to the unit must be reversed to correct rotation. When

turning backwards, the difference between compressor suction and

discharge pressures may be dramatically lower than normal.

CHECKING AND ADJUSTING REFRIGERANT CHARGE

The refrigerant system is fully charged with R-22 refrigerant and

is tested and factory sealed.

NOTE: Adjustment of the refrigerant charge is not required unless

the unit is suspected of not having the proper R-22 charge.

A refrigerant charging label is attached to the outside of the service

access panel.

The charging label and tables shown refer to system temperatures

and pressures in cooling mode only.

NOTE: Allow system to operate for a minimum of 10 minutes

before checking or adjusting refrigerant charge.

IMPORTANT: When evaluating the refrigerant charge, an

indicated adjustment to the specified factory charge must always be

very minimal. If a substantial adjustment is indicated, an abnormal

condition exists somewhere in the cooling system, such as

insufficient airflow across either coil or both coils.

018 Model Only

The charging chart (see Table 5) includes the required liquid line

temperature at given discharge line pressures and outdoor ambient

temperatures.

An accurate subcooling thermocouple or thermistor-type

thermometer and a gauge manifold are required when using the

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.

Proceed as follows:

1. Remove caps from low- and high-pressure service fittings.

2. Using hoses with valve core depressors, attach low- and

high-pressure gauge hoses to low- and high-pressure

service fittings, respectively.

3. Start unit in Cooling Mode and let unit run until system

pressures stabilize.

4. Measure and record the following:

a. Outdoor ambient-air temperature (°F (°C) db).

b. Liquid line temperature (°F (°C).

c. Discharge (high-side) pressure (psig).

5. Using "Cooling Charging Charts," compare outdoor-air

temperature (°F (°C) db) with the discharge line pressure

(psig) to determine desired system operating liquid line

temperature (see Table 5).

6. Compare actual liquid line temperature with desired liquid

line temperature. Using a tolerance of -+2°F (+/- 1.1°C), add

refrigerant if actual temperature is more than 2°F (1.1°C)

higher than proper liquid line temperature, or remove

refrigerant if actual temperature is more than 2°F (1.1°C)

lower than required liquid line temperature.

NOTE: If the problem causing the inaccurate readings is a

refrigerant leak, refer to the Check for Refrigerant Leaks section.

024 through 060 Models

The charging chart (see Table 5A) includes the required suction line

temperature at given suction line pressures and outdoor ambient

temperatures.

An accurate superheat thermocouple or thermistor-type

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

adequate for this type of measurement.

Proceed as follows:

1. Remove caps from low- and high-pressure service fittings.

2. Using hoses with valve core depressors, attach low- and

high-pressure gauge hoses to low- and high-pressure

service fittings, respectively.

3. Start unit and let run until system pressures stabilize.

4. Measure and record the following:

a. Outdoor ambient-air temperature (°F (°C) db).

b. Suction-tube temperature (°F (°C)) at low-side service

fitting.

c. Suction (low-side) pressure (psig).

Table3--Dry Coil Air Delivery* -- Horizontal Discharge

(Deduct 10% for 208-Volt Operation)

External Static Pressure (in. wc)

Unit

50SD0180

50SD024

50SD030

50SD036

50SD042

50SD048

50SD060

Molor

Speed

Low 1

High

Low 1

Medium

High

Low

Medium 1

High

Low

Medium 1

High

Low

Medium 1

High

Low

Medium 1

High

Low 1

Medium

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

0.1 0.2 0.3 0.4 0.5 0.6

260 243 229 217 209 - -

859 775 667 536 382 - -

340 326 317 307 300 294

1064 948 620 680 528 364

311 309 304 301 286 290

935 885 620 757 686 583

411 405 398 390 379 357

1195 1155 1100 1028 957 868

528 516 509 492 477 467

1484 1421 1368 1279 1185 1088

311 309 304 301 286 290

935 885 620 757 686 583

411 405 398 390 379 357

1195 1155 1100 1028 957 868

528 516 509 492 477 467

1484 1421 1368 1279 1185 1088

439 429 415 401 395 380

1242 1170 1089 994 917 837

503 491 479 461 450 436

1320 1244 1162 1081 1005 897

641 627 623 609 601 588

1362 1288 1205 1119 1033 933

434 426 422 403 404 390

1282 1241 1206 1160 1109 1040

560 548 535 526 511 496

1526 1482 1437 1398 1344 1281

765 746 730 709 690 664

1860 1805 1751 1685 1620 1541

627 617 607 584 567 548

1550 1530 1493 1461 1414 1361

771 755 734 711 690 665

0.7 0.8 0.9

286 280 - -

423 263 --

357 345 327

769 647 365

447 435 421

970 853 712

286 280 - -

423 263 --

357 345 327

769 647 365

447 435 421

970 853 712

356 339 329

702 570 442

418 404 389

767 662 541

571 559 548

626 714 580

375 360 344

967 890 613

478 460 439

1205 1125 1029

642 624 600

1468 1370 1265

528 503 480

1320 1250 1177

639 607 572

1355

748

1555

616

1354

704

1439

846

1496

CFM

Watts

CFM

Watts

CFM

Watts

CFM

Watts

High CFM

1796 1771 1734

969 941 908

2124 2071 2000

766 769 754

2027 1960 1901

673 849 633

2095 2026 1962

1012 993 981

2184 2109 2036

Air delivery values are without air filter and are for dry coil (see Wet Coil Pressure Drop table).

iFactory shipped cooling speed

"NA" = Not allowed for heating speed

1687 1645 1595 1530 1449

887 658 827 604 767

1944 1876 1811 1735 1647

736 722 705 684 656

1821 1759 1693 1616 1513

815 798 782 763 748

1887 1817 1748 1679 1583

963 948 927 904 886

1963 1886 1812 1729 1647

Note: Deduct field supplied air filter pressure drop and wet coil presalre drop to obtain external static pressure available for ducting.

Table 4--50SDWet Coil Pressul_ Drop (in. wc)

UNIT STANDARD CFM (S.C.EM.)

SIZE 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

018 0.011 0.013 0.018 0.022 - -

024 0.030 0.037 0.044 0.053 0.063 - -

030 0.037 0.044 0.053 0.063 0.072 0.081 0.105 -

036 0.05 0.061 0.072 0.080 0.090 0.110 -

042 0,044 0.051 0,059 0.065 0,072 0.080 0,088 0.095 0,105 -

048 0.044 0.050 0.053 0.059 0.066 0.072 0.077 0.086

060 - 0.079 0.087 0.095 0.102 0.113 0.123

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Fig. 13 -Wiring Diagram 208/230-1-60

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A07578

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Fig. 14 -Wiring Diagram 208/230-3-60

A07579

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NOT TO R_RESENT OT O(JAORLJPi[ _ER_INA[

_i_]NG SB SLOW BLOW FJSE

IDI_ [iN_ rELAY RELAY

ii[ iilEii_OSIAiiIEA[iNG

[RAN IIiA_SFOi_M_

4' [ S

[_GI/(_ DEE_ERGIZED

[ ANY OF FiiE OR]G[NA[ W ES FUPN SI D A:_E RFPLACED,

I Yy YUSJ BE REPL,'CED ,_/[ IYPE 90 DoG WIRE

OR IiS EOO]VA ELT

S F PRZCE PAGES OR iHERk*OSTA A!@ SURBASES

US t J) 6 COIP R CO I)UC Oi!S iOR i ] I D iLSi,H iA_l{}k

iOR i]GI Si]D IN, I IS(O',I!\ECJ "R [)" OR J! [' _, _[

FROM DR 3 AND {Y)'q,,EC Ii 5LK ,',IU

Fig. 15 -Wiring Diagram 460-3-60

50565C,0369i 40j

A07580

Table 5--Cooling Charging Chart - 018 only

Required Subcooling °F (°C) Required Liquid Line Temperature for aSpecific Subcooling (R-22)

.ode,, II

Size Outdoor Ambient Temperature Required Subcooling (°F) Required Subcooling (°C)

IPressureI 6 I lOI 16 I 2o11 Pressure

76 (24) 85 (29) 96 (36) 106 (41) 115 (46) (psig) I I I I I I (kPa) 368

018 12 6.7 12(6,7) 12(6.7) 12(6,7) 12(6.7) 134 I 71 I 88 I 61 I 56 II 924 22 19 16

141 I 74 I 6e I 54 I 5911 972 23 21 18

146 I 77 I 72 I 67 I 82111020 25 22 19

156 80 75 70 65 1076 27 24 21

163 I 83 I 78 I 73 I 68 II 1124 28 26 23

171100131173 I 7111 1179 30 27 24

179 89 84 79 74 1234 32 29 26

187 I 92 I 37 I 82 I 77 II 1269 33 31 23

1961°31901331301113613332 20

206 98 93 88 83 1413 37 34 31

214 I 101 I 98 I 91 I 38 II 1476 38 33 33

2231lO4199194139111536 40 37 34

233 107 102 97 92 1606 42 39 36

243 I 119 I 195 I 199 I 95 II 1676 43 41 38

25311131108110319811 174443 42 39

264 116 111 106 101 1620 47 44 41

274 I 119 I 114 I 109 I 104 II 1669 48 43 43

26511921117111211o711196530 47 44

297 125 120 115 110 2048 52 49 46

3o9 I 128 I 123 I 118 I 113 I I 2130 53 51 48

321,131,123,191,113,,221333 52 ,9

331 I I I III134129 124 119 2282 57 54 51

346 137 I 1321 127 I 12211 2386 58 56 53

359 140 135 130 125 2475 60 57 54

Table 5A--Cooling Charging Chart = 024 through 060 only

ODTemp.

(°F)

105

1t5

125

SuctionLineTem_

SuctionLinePressurePSL_

52 54 56 59 61 64 67 70 73 76 79 82 85 89 92

5t 55 60 64 69

53 57 62 66 70

53 57 62 66 71 75

56 61 66 71 76

53 58 63 67 72

50 54 58 62 66

50 53 57 60 64

49 52 55 58 6I

50 53 56 59

ODTemp.

(oc)

SuctionLineTem_

SuctionLinePres_

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

11 13 I5 18 21

I2 I4 16 19 21 _L_

___:__I2 14 17 19 21 24

13 I6 I9 22 24

12 14 17 20 22

10 12 t4 17 19

10 12 14 16 18

9 1t 13 14 16

t0 1t 13 15

A05109

5. Using Cooling Charging Charts compare outdoor-air

temperature (°F (°C) db) with the suction line pressure

(psig) to determine desired system operating suction line

temperature (See Table 5A).

6. Compare actual suction-tube temperature with desired

suction-tube temperature. Using a tolerance of -+3°F

(-+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) lower than required suction-tube temperature.

NOTE: If the problem causing the inaccurate readings is a

refrigerant leak. refer to Check for Refrigerant Leaks section.

INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS

NOTE: For cooling operation, the recommended airflow is 350 to

450 cfm for each 12.000 Btuh of rated cooling capacity.

Table 3 shows cooling airflows at various external static pressures.

Refer to this table to determine the airflow for the system being

installed.

NOTE: Be sure that all supply- and return-air grilles are open, free

from obstructions, and adjusted properly.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Disconnect electrical power to the unit and install lockout tag

before changing blower speed.

Airflow can be changed by changing the lead connections of the

blower motor.

All 50SD units are factory wired for low speed, except the 030

through 048 sizes, which are wired for medium speed.

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

Table 6--Color Coding for Motor Leads

Black = High Speed

Blue = Medium Speed

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 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.

These completed circuits through the thermostat connect contactor

coil (C) (through unit wire Y) and time delay relay (TDR) (through

unit wire G) across the 24-v secondary of transformer (TRAY).

The normally open contacts of energized contactor (C) close and

complete the circuit through compressor motor (COMP) to

condenser (outdoor) fan motor (OFM). Both motors start instantly.

The set of normally open contacts of energized relay TDR close and

complete the circuit through evaporator blower (indoor) fan motor

(IFM).

NOTE: Once the compressor has started and then has stopped, it

should not be started again until 5 minutes have elapsed.

The cooling cycle remains on until the room temperature drops to

a point that is slightly below the cooling control setting of the room

thermostat. At this point, the thermostat breaks the circuit between

thermostat terminal R to terminals Y and G. These open circuits

deenergize contactor coil C and relay coil TDR. The condenser and

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

cooling from the room thermostat.

MAINTENANCE

To ensure continuing high performance, and to minimize the

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

troubleshoot unit, refer to Table 6, Troubleshooting Chart.

NOTE TO EQUIPMENT OWNER: Consult your local dealer

about the availability of a maintenance contract.

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Failure to follow this warning could result in personal injury

or death and possible unit component damage.

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.

ELECTRICAL SHOCK HAZARD

Failure to follow these warnings could result in personal

injury or death:

1. Turn off electrical power to the unit before performing any

maintenance or service on this unit.

2. Use extreme caution when removing panels and parts.

3. Never place anything combustible either on or in contact

with the unit.

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.

Errors made when reconnecting wires may cause improper

and dangerous operation. Label all wires prior to

disconnecting when servicing.

The minimum maintenance requirements for this equipment are as

follows:

1. Inspect air filter(s) each month. (?lean or replace when

necessary.

2. Inspect indoor coil, drain pan, and condensate drain each

cooling season for cleanliness. Clean when necessary.

3. Inspect blov:er motor and wheel for cleanliness each cooling

season. Clean when necessary.

4. Check electrical connections for tightness and controls for

proper operation each cooling season. Service when

necessary.

5. Ensure electric wires are not in contact with refrigerant

tubing or sharp metal edges.

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 installed. See Table 1 for

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 and twice during the heating season, or

whenever the filter becomes clogged with dust and lint.

INDOOR BLOWER AND MOTOR

NOTE: All motors are pre-lubricated. Do not attempt to lubricate

these motors.

For longer life, operating economy, and continuing efficiency, clean

accumulated dirt and grease from the blower wheel and motor

annually.

] ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Disconnect and tag electrical power to the unit before cleaning

and lubricating the blower motor and wheel.

To clean the blower motor and wheel:

1. Remove and disassemble blower assembly as follows:

a. Remove unit access panel.

b. Disconnect motor lead from time delay relay (TDR).

Disconnect yellow lead from terminal L2 of the contactor.

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 in blower

compartment.

d. Ensure proper reassembly by marking blower wheel and

motor in relation to blower housing before disassembly.

e. Loosen setscrew(s) that secures wheel to motor shaft,

remove screws that secure motor mount brackets to

housing, and slide motor and motor mount out of

housing.

2. Remove and clean blower wheel as follows:

a. Ensure proper reassembly by marking wheel orientation.

b. Lift wheel from housing. When handling and/or cleaning

blower wheel, be sure not to disturb balance weights

(clips) on blower wheel vanes.

c. Remove caked-on dirt from wheel and housing with a

brush. Remove lint and/or dirt accumulations from wheel

and housing with vacuum cleaner, using soft brush

attachment. Remove grease and oil with mild solvent.

d. Reassemble wheel into housing.

e. Reassemble motor into housing. Be sure setscrews are

tightened on motor shaft flats and not on round part of

shaft.

f. Reinstall unit access panel.

3. Restore electrical power to unit. Start unit and check for

proper blower rotation and motor speeds during cooling

cycles.

OUTDOOR COIL, INDOOR COIL, AND CONDENSATE

DRAIN PAN

Inspect the condenser coil, evaporator coil, and condensate drain

pan at least once each year.

The coils are easily cleaned when dry; therefore, inspect and clean

the coils either before or after each cooling season. Remove all

obstructions, including weeds and shrubs, that interfere with the

airflow through the condenser coil.

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

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.

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

air filter(s). If the drain trough is restricted, clear it with a "plumbers

snake" or similar probe device.

OUTDOOR FAN

UNIT OPERATION HAZARD

Failure to follow 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.

1. Remove 6 screws holding outdoor grille and motor to top

cover.

2. Turn motor/grille assembly upside down on top cover to

expose fan blade.

3. Inspect tire fan blades for cracks or bends.

4. If fan needs to be removed, loosen setscrew and slide fan off

motor shaft.

5. When replacing fan blade, position blade so that the hub is

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).

6. Ensure that set screw engages the flat area on the motor shaft

when tightening.

7. Replace grille.

ELECTRICAL CONTROLS AND WIRING

Inspect and check the electrical controls and wiring annually. Be

sure to turn off the electrical power to the unit.

Remove access panel to locate all the electrical controls and wiring.

Check all electrical connections for tightness. Tighten all screw

connections. If any smoky or burned connections are noticed.

disassemble the connection, clean all the parts, re-strip the wire end

and reassemble the connection properly and securely.

After inspecting the electrical controls 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

each electrical component with the proper electrical

instrumentation. Refer to the unit wiring label when making these

checks.

REFRIGERANTCIRCUIT

Inspectallrefrigeranttubingconnectionsandtheunitbaseforoil

accumulationannually.Detectingoil generallyindicatesa

refrigerantleak.

EXPLOSION,PERSONALINJURYHAZARD

Failureto followthiswarningcouldresultin property

damage,personalinjuryordeath.

Systemunderpressure.Relievepressureandrecoverall

refrigerantbeforesystemrepairorfinalunitdisposal.Useall

serviceportsandopenallflow-controldevices,including

solenoidvalves.

If oilisdetectedorif lowperformanceissuspected,leaktestall

refrigeranttubingusinganelectronicleakdetector,orliquid-soap

solution.If a refrigerantleakis detected,referto Checkfor

RefrigerantLeakssection.

Ifnorefrigerantleaksarefoundandlowperformanceissuspected,

refertoCheckingandAdjustingRefrigerantChargesection.

INDOORAIRFLOW

Thecoolingairflowdoesnotrequirecheckingunlessimproper

performanceis suspected.If aproblemexists,besurethatall

supply-andreturn-airgrillesareopenandfreefromobstructions.

andthattheairfilterisdean.

METERINGDEVICES

018 Model Onlv-TXV

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 060 Models-AccuRater Piston

Refrigerant metering device is a fixed orifice and is located in the

distributor assembly to the indoor coil.

TROUBLESHOOTING

Refer to the Troubleshooting Chart (Table 7) for troubleshooting

information.

START-UP CHECKLIST

Use the Start-Up Checklist at the back of this manual. n

Table7--TroubleshootingChart

SYMPTOM

Compressor and outdoor fan will not start

Compressor win not start but condenser fan

FUnS

Three=phase scroll sompressor has a low

pressure differential

Compressor cycles (other than normally

satisfying) cooling/heating sails

Compressor operates continuously

Excessive head pressure

Head pressure too low

Excessive suction pressure

Suction pressure too low

CAUSE

Power failure

Fuse blown sr circuit breaker tripped

Defective contactor, transformer, control relay, or high-

pressure, loss-of-charge or low-pressure switch

Insufficient line voltage

Incorrect or faulty wiring

Thermostat setting too low/too high

Faulty wiring or circuit

Loose connections in compressor

Compressor motor burned out, seized, or

internal overload open

Defective run capacitor, overload, or PTC (positive

temperature coefficient) thermistor

One leg of 3-phase power dead

Low input voltage (20 percent low)

Scroll compressor is rotating in the wrong direction

Refrigerant overcharge or undercharge

Defective compressor

Insufficient line voltage

Blocked outdoor coil

Defective run/start capacitor, overload or start relay

Faulty outdoor fan motor or capacitor

Restriction in refrigerant system

Dirty air filter

Unit undersized for load

Thermostat temperature set too low

Low refrigerant charge

Air in system

Outdoor coil dirty or restricted

Dirty air filter

Dirty indoor or outdoor coil

Refrigerant overcharged

Air in system

Indoor or outdoor air restricted or air short-cycling

Low refrigerant charge

Restriction in liquid tube

High heat load

Reversing valve hung up or leaking internally

Refrigerant overcharged

Dirty air filter

Low refrigerant charge

Metering device or low side restricted

Insufficient coil airflow

Temperature too low in conditioned area

Outdoor ambient below 55°F

Filter drier restricted

REMEDY

Call power company

Replace fuse sr reset circuit breaker

Replace component

Determine cause and correct

Check wiring diagram and rewire correctly

Reset thermostat setting

Check wiring and repair or replace

Determine cause

Replace compressor

Determine cause and replace

Replace fuse or reset circuit breaker

Determine cause

Determine cause and correct

Correct the direction of rotation by reversing the

3-phase power leads to the unit

Recover refrigerant, evacuate system, and re-

charge to capacities shown on rating plate

Replace and determine cause

Determine cause and correct

Determine cause and replace

Replace

Locate restriction and remove

Replace filter

Decrease load sr increase unit size

Reset thermostat setting

Locate leak, repair, and recharge

Recover refrigerant, evacuate system, and re-

charge

Clean coil or remove restriction

Replace filter

Clean coil

Recover excess refrigerant

Recover refrigerant, evacuate system, and re-

charge

Determine cause and correct

Check for leaks, repair and recharge

Remove restriction

Check for source and eliminate

Replace valve

Recover excess refrigerant

Replace filter

Check for leaks, repair and recharge

Remove source of restriction

Check filter replace if necessary

Reset thermostat setting

Install low-ambient kit

Replace

I. Preliminary information

MODEL NO.:

SERIAL NO.:

DATE:

TECHNICIAN:

START-UP CHECKLIST

(Remove and Store in Job File)

li. PRE-START=UP (Insert checkmark in box as each item is completed)

) VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

) REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS

) CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS

) CHECKTHAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE

) VERIFY THAT UNIT INSTALLATION IS LEVEL

( ) CHECK FAN WHEEL, AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS

III. START-UP

ELECTRICAL

SUPPLY VOLTAGE

COMPRESSOR AMPS

INDOOR (EVAPORATOR) FAN AMPS

TEMPERATURES

OUTDOOR (CONDENSER) AIR TEMPERATURE

RETURN-AIR TEMPERATURE DB

COOLING SUPPLY AIR DB WB

PRESSURES

REFRIGERANT SUCTION PSIG SUCTION LINE TEMP*

REFRIGERANT DISCHARGE PSIG DISCHARGE TEMPt

( ) VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS

*Measured at suction inlet to compressor

1-Measured at liquid line leaving condenser.

Manufacturer reserves the right to change, at any time_ specifications and design without notice and without obligation.

Catalog No: 50SD-7Sl

Replaces: 50SD-6SI

CARRIER Package Units(both Units Combined) Manual L0801094

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