Service Manual
40MKCC / 24AHA4 / 124ANS
40MKQC / 25HHA4 / 224ANS
Cassette Ductless Split System
Sizes 18 to 34
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS
1
. . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODEL / SERIAL NUMBER NOMENCLATURES
2
. . . . . . . .
STANDARD FEATURES AND ACCESSORIES
3
. . . . . . . . . . .
SPECIFICATIONS
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIMENSIONS
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLEARANCES
8
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ELECTRICAL DATA
9
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POWER AND CONNECTING CABLES
10
. . . . . . . . . . . . . . . .
CONNECTION DIAGRAMS
11
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REFRIGERATION CYCLE DIAGRAMS
16
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REFRIGERANT LINES
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SYSTEM EVACUATION AND CHARGING
17
. . . . . . . . . . . . .
SEQUENCE OF OPERATION
18
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TROUBLESHOOTING
19
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DISASSEMBLY
23
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APPENDIX
29
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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 MK family of air conditioners and heat
pumps. Section 2 of this manual is an appendix with data required
to perform troubleshooting. Use the Table of Contents to locate a
desired topic.
