Carrier 38AH044-084 specifications Installation, Start-Up Service Instructions

38AH044-134 Air-Cooled Condensing Units 50/60 Hz

Installation, Start-Up and

Service Instructions

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37 Step 1 Ð Rig and Place Unit . . . . . . . . . . . . . . . 1

·DOMESTIC UNITS

·EXPORT UNITS

·PLACING UNITS

Step 2 Ð Check Compressor Mounting . . . . . 3

·UNITS 38AH044-084

·UNITS 38AH094-134

Step 3 Ð Make Refrigerant Piping

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

·UNITS 38AH044-084

·UNITS 38AH094-134

Step 4 Ð Make Electrical Connections . . . . . . 23

·POWER SUPPLY

·FIELD POWER CONNECTIONS

·MAIN POWER

·CONTROL CIRCUIT WIRING

Step 5 Ð Install Accessories 37

·LOW-AMBIENT OPERATION

·MISCELLANEOUS ACCESSORIES

PRE-START-UP 37,38

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-45 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46-49 CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49-52 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 53,54 START-UP CHECKLIST . . . . . . . . . . . . . . . CL-1, CL-2

SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can be hazardous due to system pressures, electrical compo- nents, and equipment location (roofs, elevated structures, etc.).

Only trained, quali®ed installers and service mechanics should install, start up, and service this equipment.

Untrained personnel can perform basic maintenance func- tions, such as cleaning coils. All other operations should be performed by trained service personnel.

When working on the equipment, observe precautions in the literature, and on tags, stickers, and labels attached to the equipment and any other safety precautions that may apply.

·Follow all safety codes.

·Wear safety glasses and work gloves.

·Use care in handling, rigging, and setting bulky equipment.

ELECTRIC SHOCK HAZARD.

Open all remote disconnects before servicing this equipment.

INSTALLATION

Step 1 Ð Rig and Place Unit Ð All units are designed for overhead rigging, and it is important that this method be used. Lifting holes are provided in the frame base rails, which are marked for rigging (see rigging label on the unit and Tables 1, 2A, and 2B for rigging weights and center of gravity). It is recommended that ®eld-supplied pipes, of suf®cient length to extend at least 12-in. (305 mm) beyond the frame, be passed through the holes.

To maintain unit stability while lifting, use 4 cables, chains, or straps of equal length. Attach one end of each cable to one pipe end and the other end of each cable to the overhead rigging point.

Use spreader bars or frame to keep the cables, chains, and straps clear of the unit sides. Leave standard coil pro- tection packaging in place during rigging to provide protec- tion to coils. Remove and discard all coil protection after rigging cables are detached.

DOMESTIC UNITS Ð For units 38AH044-084, 124, and 134; standard unit packaging consists of coil protection only. There is no standard packaging provided for units 38AH094 and 104. Skids are not provided. If overhead rigging is not available at the jobsite, place the unit on a skid or pad before dragging or rolling. When rolling, use a minimum of 3 rollers. When dragging, pull the pad or skid. Do not apply force to the unit. When in ®nal position, raise from above to lift unit off the pad or skid.

EXPORT UNITS Ð All export units are mounted on skids with vertical coil protection. Leave the unit on the skid until it is in ®nal position. While on the skid, the unit can be rolled or skidded. Apply force to the skid, not to the unit. Use a minimum of 3 rollers when rolling. When in ®nal position, raise from above to remove the skid.

PLACING UNITS

Units 38AH044-084 Ð Refer to Fig. 1 and 2 for air¯ow clear- ances. Recommended minimum clearances are 6 ft (1829 mm) for unrestricted air¯ow and service on sides of unit, 5 ft (1524 mm) on ends, and unrestricted clear air space above the unit. Provide ample space to connect liquid and suction lines to indoor unit. For multiple units, allow 8 ft (2440 mm) separation between units for air¯ow and service.

Do not forklift these units unless the unit is attached to a skid designed for forklifting.

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

Book	1	PC 111	Catalog No. 563-704	Printed in U.S.A.	Form 38AH-15SI	Pg 1	10-98	Replaces: 38AH-14SI
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