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Specifications subject to change without notice.

TABLE of CONTENTS

PAGE

SA\FETY CONSIDERATIONS

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

38MBR

family of heat pumps. Use the

“TABLE of CONTENTS” on page 1 to locate a desired topic. For
detailed information regarding product specifications refer to product
data documentation.

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

38MBR

Outdoor Unit Single Zone Ductless System

Sizes 36 to 58