Carrier 40MAHB Series Service Manual Download

Page: 1 / 50

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

40MAHB

family of heat pumps. This manual

has an appendix (see “APPENDICIES” on page 37) with data
required to perform troubleshooting. Use the “TABLE of
CONTENTS”on page 1 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 the system, the

main electrical disconnect switch must be in the

OFF

position. There may be more than 1 disconnect switch. Lock

out and tag switch (es) 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 a system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start-up.

CAUTION

Service Manual

40MAHB
High Wall Ductless System
Sizes 06 to 36