Carrier 40MAHB Series Service Manual

40MAHB
High Wall Ductless System
Sizes 06 to 36

TABLE of CONTENTS

INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
WIRING ........................................................................................... 3
CONNECTION DIAGRAMS ......................................................... 4
WIRING DIAGRAM....................................................................... 5
REFRIGERATION CYCLE DIAGRAM........................................ 6
REFRIGERANT LINES .................................................................. 6
FAN AND MOTOR SPECIFICATIONS ........................................ 7
SYSTEM EVACUATION AND CHARGING ............................... 8
INQUIRY MODE ............................................................................ 12
TROUBLESHOOTING................................................................... 13
INDOOR UNIT DIAGNOSTIC GUIDES....................................... 14
DIAGNOSIS AND SOLUTION...................................................... 15
APPENDICIES ................................................................................ 37
DISASSEMBLY INSTRUCTIONS ................................................ 40
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.
Service Manual
PAGE
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.
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.
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.

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.
Specifications subject to change without notice.
WARNING
WARNING
CAUTION