Carrier 38Tra Users Manual

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38TRA

Air Conditioning Unit

Installation and Start-Up Instructions

NOTE: Read the entire instruction manual before starting the

installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,

or use can cause explosion, fire, electrical shock, or other

conditions which may cause personal injury or property damage.

Consult a qualified installer, service agency, or your distributor or

branch for information or assistance. The qualified installer or

agency must use factory-authorized kits or accessories when

modifying this product. Refer to the individual instructions pack-

aged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use

quenching cloth for brazing operations. Have fire extinguisher

available. Read these instructions thoroughly and follow all

warnings or cautions attached to the unit. Consult local building

codes and the National Electrical Code (NEC) for special instal-

lation requirements.

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

When you see this symbol on the unit or in instructions and

manuals, be alert to the potential for personal injury.

Understand the signal word DANGER, WARNING, or CAU-

TION. These words are used with the safety-alert symbol. DAN-

GER identifies the most serious hazards which will result in severe

personal injury or death. WARNING signifies hazards that could

result in personal injury or death. CAUTION is used to identify

unsafe practices which would result in minor personal injury or

product and property damage.

Before installing or servicing system, always turn off main

power to system. There may be more than 1 disconnect

switch. Turn off accessory heater power if applicable. Elec-

trical shock can cause personal injury or death.

INSTALLATION

Step 1—Check Equipment and Jobsite

UNPACK UNIT — Move to final location. Remove carton taking

care not to damage unit.

INSPECT EQUIPMENT — File claim with shipping company,

prior to installation, if shipment is damaged or incomplete. Locate

unit rating plate on unit corner panel. (See Fig. 2.) It contains

information needed to properly install unit. Check rating plate to

be sure unit matches job specifications.

Step 2—Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad,

tiedown bolts should be used and fastened through knockouts

provided in unit base pan. Refer to unit mounting pattern in Fig. 2

to determine base pan size and knockout hole location.

When installing, allow sufficient space for airflow clearance,

wiring, refrigerant piping, and service. Allow 30-in. clearance to

service end of unit and 48 in. above unit. For proper airflow, a 6-in.

clearance on 1 side of unit and 12 in. on all remaining sides must

be maintained. Maintain a distance of 24 in. between air condi-

tioners. Position so snow, ice, and water from roof or eaves cannot

fall directly on unit.

On rooftop applications, locate unit at least 6 in. above roof

surface. Where possible, place unit above a load-bearing wall.

Arrange supporting members to adequately support unit and

minimize transmission of vibration to building. Consult local

codes governing rooftop applications.

Step 3—Replace Indoor AccuRater® Piston, If Required

Check indoor coil piston to see if it matches the required piston

shown on unit rating plate. (See Fig. 2.) If it does not match,

replace indoor coil piston with piston shipped with this unit. The

piston shipped with outdoor unit is correct for any approved indoor

coil combination.

If unit is to be installed on system with a thermostatic

expansion valve (TXV), removal of the indoor coil piston is

required.

Fig. 1—Model 38TRA A92446

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4

Tab 3a 2a PC 101 Catalog No. 563-793 Printed in U.S.A. Form 38TRA-3SI Pg 1 1-94 Replaces: 38TRA-2SI

DO NOT BURY MORE THAN 36 IN. OF REFRIGERANT

TUBING IN GROUND. If any section of tubing is buried,

there must be a 6-in. vertical rise to the valve connections on

the outdoor unit. If more than the recommended length is

buried, refrigerant may migrate to cooler buried section

during extended periods of unit shutdown, causing refrigerant

slugging and possible compressor damage at start-up.

Step 4—Make Piping Connections

Outdoor units may be connected to indoor sections using accessory

tubing package or field−supplied refrigerant grade tubing of

correct size and condition. For tubing requirements beyond 50 ft,

consult Long-Line Application Guideline which is available at

your local distributor.

In some cases noise in the living area has been traced to gas

pulsations from improper installation of equipment.

INSTALLATION RECOMMENDATIONS

1. Locate the unit away from windows.

2. Ensure that vapor and liquid line diameters are appropriate to

the capacity of the unit. (See Table 1.)

3. Run refrigerant tubes as directly as possible by avoiding

unnecessary turns and bends.

4. Leave some slack between the structure and the unit to absorb

vibration.

5. When passing refrigerant tubes through the wall, seal the

opening with RTV or other pliable silicon-based caulk. (See

Fig. 3.)

6. Avoid direct lineset contact with water pipes, ductwork, floor

joists, wall studs, floors, and walls.

7. Do not suspend refrigerant tubing from joists and studs with a

rigid wire or strap which comes in direct contact with the

tubing. (See Fig. 3.)

8. Ensure that tubing insulation is pliable and completely sur-

rounds the vapor line.

9. When necessary, use hangar straps which are 1 in. wide and

conform to the shape of the tubing insulation. (See Fig. 3.)

10. Isolate the hangar straps from the insulation by using metal

sleeves bent to conform to the shape of the insulation.

If refrigerant tubes or indoor coil is exposed to atmospheric

conditions for longer than 5 minutes, it must be evacuated to 500

microns to eliminate contamination and moisture in the system.

OUTDOOR UNITS CONNECTED TO FACTORY-APPROVED

INDOOR UNITS — Outdoor unit contains correct system refrig-

erant charge for operation with indoor unit of the same size when

Fig. 2—Unit Reference Drawing

UNIT

SIZE A B C D E

In. In. In. In. In.

018 27-1/2 22-1/2 8-3/16 2-13/16 6-15/16

024-048 34-15/16 30 8-3/16 4 9-3/4

060 (301 Series) 45 38-5/8 8-9/16 5-15/16 11-13/16

060 (311 Series) 34-15/16 30 8-3/16 4 9-3/4

A92471

AIR DISCHARGE

3/8″ DIA LIQUID 

LINE CONN

FIELD CONTROL 

SUPPLY CONN

7/8″ DIA HOLE 

AIR DISCHARGE

AIR DISCHARGE AIR IN

AIR IN

3/8

"

DIA TIEDOWN KNOCKOUTS

(2) PLACES IN BASEPAN

C

L

UNIT RATING 

PLATE

1. ALLOW 30″ CLEARANCE TO SERVICE END OF

UNIT, 48″ ABOVE UNIT, 6″ ON ONE SIDE, 12″

ON REMAINING SIDE, AND 24″ BETWEEN

UNITS FOR PROPER AIRFLOW.

2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS

55° F (UNLESS LOW AMBIENT CONTROL IS USED) MAX 125° F.

5. SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT

MODEL NUMBER.

6. CENTER OF GRAVITY

NOTES:

ACCESS

PANEL

FIELD POWER SUPPLY CONN

7/8″ DIA HOLE WITH 

1 1/8″ DIA KNOCKOUT

AND 

1 3/8″ DIA KNOCKOUT

A

C

AIR IN

E

D

B

VAPOR LINE CONN

INDIANAPOLIS IN

46206313948-401 REV A

MAX CKT-BKR

MAX HACR CKT-BKR

MAX FUSE

TYPE

MINIMUM CIRCUIT AMPS

LO

HI

DESIGN/TEST PRESSURE GAGE

FLA

HZ

PH

VOLTS AC

LRA

RLA

HZ

PH

VOLTS AC

MAX

PH

LBS

PISTON

MODEL

PROD

SERIAL

N/A

USA

N/A

CANADA

MAX OVERCURRENT PROTECTIVE DEVICE

kPa

kPa

PSI

PSI

FAN MOTOR

COMPRESSOR

SUITABLE FOR OUTDOOR USE

MIN

HZ

Kg

VOLTSPOWER SUPPLY

ID OD

FACTORY CHARGED R-22

®

®

PERMISSIBLE VOLTAGE AT UNIT

CARRIER CORP

2

connected by 15 ft of field-supplied or factory-accessory tubing.

Check refrigerant charge for maximum efficiency. (See Step

8—Checking Charge.)

INSTALL SOLENOID VALVE IN LIQUID TUBE

Solenoid valve must be energized during evacuation for

effective evacuation.

Before making liquid tube connections, install factory-supplied

solenoid valve on indoor liquid fitting. (See Fig. 4.) Be sure to use

flare adapter supplied with the indoor coil when making connec-

tions.

If a field-supplied control power source is needed when

adding solenoid, wiring must comply with local codes and

NEC requirements.

1. Remove coil liquid connection cap and discard.

2. Mount solenoid valve on liquid tube, making sure valve flow

arrow points toward indoor coil. Mount valve in any position

except valve body at top and electric coil at bottom. (See Fig.

4.) The solenoid valve is to be installed a maximum of 24 in.

from indoor coil.

3. Braze valve onto end of liquid tube using silver bearing or

non-silver bearing brazing material. Consult local code re-

quirements.

4. Braze flare adapter onto outlet end of the solenoid valve.

5. Wire solenoid coil into system control circuit as shown in Fig.

6.

Table 1—Refrigerant Connections and Recom-

mended Liquid and Vapor Tube Diameters (In.)

UNIT

SIZE

LIQUID VAPOR

Connect

Diameter Tube

Diameter Connect

Diameter Tube

Diameter

018, 024 3/8 3/8 5/8 5/8

030, 036 3/8 3/8 3/4 3/4

042, 048 3/8 3/8 7/8 7/8

060 3/8 3/8 7/8 1-1/8

Notes: 1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater

than 50 ft, consult Long-Line Application Guideline.

2. Do not apply capillary-tube indoor coils to these units.

REFRIGERANT TUBING — Connect tubing to fittings on out-

door unit vapor and liquid service valves. (See Fig. 2.)

A brazing shield MUST be used when tubing sets are being

brazed to the service valves to prevent damage to the painted

unit surface.

Relieve pressure and recover all refrigerant before system

repair or final unit disposal to avoid personal injury or death.

Use all service ports and open all flow control devices,

including solenoid valves.

To avoid valve damage while brazing, service valves must be

wrapped with a heat-sinking material such as a wet cloth.

SWEAT CONNECTION — Use refrigerant grade tubing. Service

valves are closed from factory and ready for brazing. After

wrapping the service valve with a wet cloth, the tubing set can be

brazed to the service valve using either silver bearing or non-silver

Fig. 3—Piping Installation A92469

OUTDOOR WALL

CAULK

INDOOR WALL

LIQUID LINE

VAPOR LINE

INSULATION

JOIST

INSULATION

HANGER STRAP

(AROUND VAPOR 

LINE ONLY)

VAPOR LINE

LIQUID

LINE

THROUGH THE WALL

SUSPENSION

1″ 

MIN

NOTE: 

AVOID CONTACT BETWEEN TUBING AND STRUCTURE

Fig. 4—Solenoid Valve Installation A87044

ELECTRICAL JUNCTION

ELECTRICAL COIL

VALVE FLOW ARROW

STRAIGHT 3/8 IN. STUD

NOTE:System flow direction

must match arrow on

bottom of body.

3

bearing brazing material. Consult local code requirements. Refrig-

erant tubing and indoor coil are now ready for leak testing. This

check should include all field and factory joints.

Step 5—Make Electrical Connections

Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction of

improper voltage. See unit rating plate for recommended circuit

protection device. (See Fig. 2.)

NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate.

NOTE: Use only copper wire between disconnect switch and

unit.

NOTE: Install branch circuit disconnect per NEC of adequate

size to handle unit starting current, but not larger than maximum

fuse size shown on unit rating plate. Locate disconnect within sight

from and readily accessible from unit, per Section 440-14 of NEC.

ROUTE GROUND AND POWER WIRES — Remove access

panel and control box cover to gain access to unit wiring. Extend

wires from disconnect through power wiring hole provided and

into unit control box. (See Fig. 2.) Size wires per NEC but not

smaller than minimum wire size shown in presale literature.

The cabinet must have an uninterrupted or unbroken ground

according to NEC, ANSI/NFPA 70-1993 or local codes to

minimize personal injury if an electrical fault should occur.

This may consist of electrical wire or conduit approved for

electrical ground when installed in accordance with existing

electrical codes. Failure to follow this warning could result in

an electrical shock, fire, or death.

To avoid personal injury or death, do not supply power to unit

with compressor terminal box cover removed.

CONNECT GROUND AND POWER WIRES — Connect ground

wire to ground connection in control box for safety. Connect

power wiring to contactor as shown in Fig. 5.

CONNECT CONTROL WIRING — Route 24-v control wires

through control wiring grommet and connect to brown and blue

pigtails supplied in unit splice box. (See Fig. 6.)

Use No. 18 AWG color-coded, insulated (35° C minimum) wire.

If thermostat is located more than 100 ft from unit (as measured

along the control voltage wires), use No. 16 AWG color-coded

wire to avoid excessive voltage drop.

Use furnace transformer, fan coil transformer, or accessory trans-

former for control power, 24-v/40va minimum.

NOTE: Use of available 24-v accessories may exceed the mini-

mum 40-va power requirement. Determine total transformer load-

ing and increase the transformer capacity or split the load with an

accessory transformer as required.

Step 6—Install Electrical Accessories

Refer to the individual instructions packaged with the kits or

accessories when installing.

Step 7—Start-up

1. Fully back seat (open) liquid and vapor service valves.

2. Unit is shipped with valve stem(s) front seated and caps

installed. Replace stem caps after system is opened to refrig-

erant flow (back seated). Replace caps finger tight and tighten

additional 1/6 turn with wrench.

3. Close electrical disconnects to energize system.

4. Set room thermostat at desired temperature. Be sure set point

is below indoor ambient temperature.

5. Set room thermostat at COOL and fan switch at FAN or

AUTO, as desired. Operate unit for 15 minutes. Check system

refrigerant charge. (See Step 8—Checking Charge.)

Step 8—Checking Charge

Factory charge is shown on unit rating plate. (See Fig. 2.)

Do not disable low-pressure switch during a condenser pump

down. Compressor damage may occur if run at a negative

suction pressure.

Compressor damage may occur if system is overcharged.

Service valve gage ports are not equipped with Schrader

valves. To prevent personal injury, make sure valves are fully

back seated before removing gage port caps. Wear safety

glasses and gloves when handling refrigerant.

Adjust charge by following procedure shown on the superheat

charging tables located on unit information plate.

Do not vent refrigerant to atmosphere. Recover during system

repair or final unit disposal.

CARE AND MAINTENANCE

For continuing high performance and to minimize possible equip-

ment failure, it is essential that periodic maintenance be performed

on this equipment. Consult your servicing contractor or User’s

Manual for the proper frequency of maintenance. Frequency of

maintenance may vary depending upon geographic areas, such as

coastal applications.

Step 1—Leave User’s Manual With Homeowner

Explain system operation and maintenance procedures outlined in

User’s Manual.

Fig. 5—Line Power Connections A91056

DISCONNECT

PER N. E. C. AND/OR

LOCAL CODES

CONTACTOR

GROUND

LUG

FIELD GROUND

WIRING

FIELD POWER

WIRING

4

Fig. 6—24-V Control Circuit Connector A93199

4

4RH

R

Y

G

A

W

LLS

NC

TRANS

MIN 60VA

TO IFM LINE

VOLTAGE

POWER

SUPPLY

IFR

C

C

BLU BRN

Y

COND UNIT

THERMOSTAT

SUBASE

RC

B

Y1

Y2

G

W1

W2

LEAVE JUMPER

ON SUBASE

(RH TO RC)

LLS

NC

TRANS

SEE NOTE 2

TO IFM LINE

VOLTAGE

POWER

SUPPLY

C

BLU BRN

HC1

HC2

ADD JUMPER

R

Y

G

A

W

IFR

TO IFM LINE

VOLTAGE

POWER

SUPPLY C

BLU BRN

HC

NOTES:1. REFER TO UNIT LABEL WIRING DIAGRAM FOR 

WIRE COLORS. IFR, IFM AND LLS ARE LOCATED

INDOORS ON HEATING-COOLING APPLICATIONS.

IF ACCESSORY IFR IS REQUIRED FOR COOLING-

ONLY APPLICATIONS, LOCATE IFR IN FAN COIL.

2. N.E.C. CLASS 2, 24V CIRCUIT, MIN 40VA REQUIRED.

ARRANGEMENT A–COOLING ONLY ARRANGEMENT C–1 TRANSFORMER;

COOLING AND 2-STAGE HEATING

C – CONTACTOR

HC – HEATING CONTROL

IFM – INDOOR FAN MOTOR

LLS

NC – NORMALLY CLOSED

– LIQUID LINE SOLENOID VALVE

TRANS – TRANSFORMER

IFR

TRANS

SEE NOTE 2

LLS

NC

ARRANGEMENT B – 1 TRANSFORMER;

COOLING AND 1-STAGE HEATING

5

Copyright 1993 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 33026c

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4

Tab 3a 2a PC 101 Catalog No. 563-793 Printed in U.S.A. Form 38TRA-3SI Pg 6 1-94 Replaces: 38TRA-2SI