Carrier 38TRA User Manual

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 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 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. Electrical shock can cause personal injury or death.

INSTALLATION

Step 1ÐCheck Equipment and Jobsite

UNPACK UNIT Ð Move to final location. Remove carton taking care not to damage unit.

INSPECT EQUIPMENT Ð 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 2ÐInstall 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.

A92446

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

AIR DISCHARGE		AIR IN		3/8" DIA TIEDOWN KNOCKOUTS
				(2) PLACES IN BASEPAN
				NOTES:
				1. ALLOW 30² CLEARANCE TO SERVICE END OF
					UNIT, 48² ABOVE UNIT, 6² ON ONE SIDE, 12²
					ON REMAINING SIDE, AND 24² BETWEEN
AIR IN			D		UNITS FOR PROPER AIRFLOW.
C				2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS
L					55° F (UNLESS LOW AMBIENT CONTROL IS USED) MAX 125° F.
				5.	SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT
				E	MODEL NUMBER.
				6.	CENTER OF GRAVITY
			C
AIR DISCHARGE		AIR IN
VAPOR LINE CONN						UNIT RATING
						PLATE
		A		FIELD POWER SUPPLY CONN
				7/8² DIA HOLE WITH
	AIR DISCHARGE			1 1/8² DIA KNOCKOUT		B
					AND
				1 3/8² DIA KNOCKOUT

FIELD CONTROL SUPPLY CONN

7/8² DIA HOLE

ACCESS

PANEL

3/8² DIA LIQUID LINE CONN

SERIAL
PROD
MODEL
PISTON		ID	OD
	FACTORY CHARGED R-22
		LBS		Kg
POWER SUPPLY				VOLTS
		PH		HZ
	PERMISSIBLE VOLTAGE AT UNIT
		MAX		MIN
	SUITABLE FOR OUTDOOR USE
		COMPRESSOR
VOLTS AC
PH
HZ
RLA
LRA
		FAN MOTOR
VOLTS AC
PH
HZ
FLA
	DESIGN/TEST PRESSURE GAGE
HI	PSI		kPa
LO	PSI		kPa
MINIMUM CIRCUIT AMPS
MAX OVERCURRENT PROTECTIVE DEVICE
	TYPE		USA	CANADA
MAX FUSE
MAX HACR CKT-BKR				N/A
MAX CKT-BKR			N/A
	®
		®

CARRIER CORP INDIANAPOLIS IN

313948-401 REV A

46206

A92471

	UNIT	A	B	C	D	E
	SIZE	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. 2ÐUnit Reference Drawing

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 4ÐMake 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 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 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 Ð Outdoor unit contains correct system refrigerant charge for operation with indoor unit of the same size when

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