Carrier 38TRA User Manual

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 packaged 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 installation 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 CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which willresultinsevere 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. Electrical 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 unitand 48 in. above unit. For proper airflow, a 6-in.

38TRA

Air Conditioning Unit

A92446

Fig. 1—Model 38TRA

clearance on 1 side of unit and 12 in. on all remaining sides must be maintained. Maintain a distance of 24 in. between air conditioners. 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.

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

AIR DISCHARGE

AIR IN

AIR DISCHARGE

VAPOR LINE CONN

AIR DISCHARGE

AIR IN

DIA TIEDOWN KNOCKOUTS

(2) PLACES IN BASEPAN

NOTES:

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

FIELD POWER SUPPLY CONN

/8″ DIA HOLE WITH 

/8″ DIA KNOCKOUT

AND 

/8″ DIA KNOCKOUT

FIELD CONTROL  SUPPLY CONN

/8″ DIA HOLE 

/8″ DIA LIQUID 

LINE CONN

UNIT RATING 

PLATE

ACCESS

PANEL

SERIAL PROD MODEL

ID OD

PISTON

FACTORY CHARGED R-22

LBS

VOLTSPOWER SUPPLY

PERMISSIBLE VOLTAGE AT UNIT

MAX

SUITABLE FOR OUTDOOR USE

COMPRESSOR VOLTS AC PH HZ RLA LRA

FAN MOTOR VOLTS AC PH HZ FLA

DESIGN/TEST PRESSURE GAGE

kPa

PSI

kPa

PSI

MINIMUM CIRCUIT AMPS

MAX OVERCURRENT PROTECTIVE DEVICE

USA

N/A

INDIANAPOLIS IN

CANADA

N/A

46206313948-401 REV A

TYPE MAX FUSE MAX HACR CKT-BKR

MAX CKT-BKR

CARRIER CORP

MIN

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

Fig. 2—Unit Reference Drawing

3. Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.

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.

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.

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.

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 surrounds 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 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.)

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

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