38MAQ
Outdoor Unit Single Zone Ductless System
Sizes 09 to 30
Service Manual
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS
1
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INTRODUCTION
1
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MODEL/SERIAL NUMBER NOMENCLATURES
2
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SPECIFICATIONS
3
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DIMENSIONS 4
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CLEARANCES 7
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PERFORMANCE
6
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ELECTRICAL DATA
8
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WIRING
8
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CONNECTION DIAGRAMS
9
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WIRING DIAGRAMS
10
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FAN AND MOTOR SPECIFICATIONS
15
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REFRIGERANT COIL SPECIFICATIONS
16
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REFRIGERATION CYCLE DIAGRAMS
17
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REFRIGERANT LINES
18
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SYSTEM EVACUATION AND CHARGING
19
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ELECTRONIC FUNCTION
20
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TROUBLESHOOTING
21
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DIAGNOSTIC GUIDES
23
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DIAGNOSIS AND SOLUTION
29
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APPENDIX
46
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DISASSEMBLY INSTRUCTIONS
52
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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 cleaning coils. 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 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 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.
!
WARNING
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.
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
CAUTION
!
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.
INTRODUCTION
This service manual provides the necessary information to service,
repair, and maintain the outdoor units. Section 2 of this manual has an
appendix with data required to perform troubleshooting. Use the Table
of Contents to locate a desired topic.
