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Specifications subject to change without notice.

TABLE of CONTENTS

PAGE

Installing, starting up, and servicing air-conditioning equipment can

be hazardous due to system pressures, electrical components, and

equipment location (roofs, elevated structures, etc.). Only trained,

qualified installers and service mechanics should install, start-up, and

service this equipment.
Untrained personnel can perform basic maintenance functions such as

coil cleaning. 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.
Follow all safety codes. Wear safety glasses and work gloves. Keep a

quenching cloth and fire extinguisher nearby when brazing. Use care

in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions
included in the literature and attached to the unit. Consult local
building codes and National Electrical Code (NEC) for special
requirements. 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 serious 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 enhanced installation, reliability, or operation.

INTRODUCTION

This service manual provides the necessary information to service,
repair, and maintain the

38MARB

family of heat pumps. This manual

has an “APPENDICIES” with data required to perform
troubleshooting. Use the “TABLE of CONTENTS” to locate a desired
topic.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.
Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the

OFF

position.

There may be more than 1 disconnect switch. Lock out and

tag switch with a suitable warning label.

WARNING

EXPLOSION HAZARD

Failure to follow this warning could result
in death, serious personal injury, and/or
property damage. Never use air or gases
containing oxygen for leak testing or
operating refrigerant compressors.
Pressurized mixtures of air or gases
containing oxygen can lead to an explosion.

WARNING

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage
or improper operation.Do not bury more than 36 in. (914 mm)
of refrigerant pipe in the ground. If any section of pipe is
buried, there must be a 6 in. (152 mm) vertical rise to the valve
connections on the outdoor units.

If more than the recommended length is buried, refrigerant
may migrate to the cooler buried section during extended
periods of system shutdown. This causes refrigerant slugging
and could possibly damage the compressor at start-up.

CAUTION

Service Manual

38MARB

Outdoor Unit Single Zone Ductless System
Sizes 06 to 36