TABLE of CONTENTS
PAGE
SAFETY CONSIDERATIONS ....................................................... 1
INTRODUCTION............................................................................1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
SPECIFICATIONS .......................................................................... 3
DIMENSIONS ................................................................................. 4
CLEARANCES................................................................................ 8
ELECTRICAL DATA ..................................................................... 9
WIRING........................................................................................... 9
CONNECTION DIAGRAMS .........................................................10
AUTOMATIC WIRING/PIPING CORRECTION ......................... 13
WIRING DIAGRAMS..................................................................... 14
REFRIGERATION CYCLE DIAGRAMS......................................22
REFRIGERANT LINES .................................................................. 24
SYSTEM EVACUATION AND CHARGING ............................... 25
ELECTRONIC FUNCTION............................................................26
TROUBLESHOOTING................................................................... 31
OUTDOOR UNIT DIGITAL DISPLAY.........................................32
OUTDOOR UNIT DISPLAY.......................................................... 32
APPENDICES..................................................................................64
DISASSEMBLY INSTRUCTIONS SIZE 18.................................. 72
DISASSEMBLY INSTRUCTIONS SIZE 24.................................. 80
DISASSEMBLY INSTRUCTIONS SIZE 30.................................. 89
DISASSEMBLY INSTRUCTIONS SIZES 36 AND 48................. 96
SAFETY 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 multi-zone family of heat pumps. This
manual has an appendix with data required to perform
troubleshooting. See “APPENDICES” on page 64. 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 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
38MGR
Multi-zone Outdoor Unit Ductless System
Sizes 18, 24, 30, 36 and 48
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