Carrier 38MAQB30-3 - User Manual

38MAQ
Outdoor Unit Single Zone Ductless System
Sizes 09 to 30
Service Manual
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 1...................................
MODEL/SERIAL NUMBER NOMENCLATURES 2.........
SPECIFICATIONS 3...................................
DIMENSIONS 4.....................................
CLEARANCES 7.....................................
PERFORMANCE 6...................................
ELECTRICAL DATA 8................................
WIRING 8...........................................
CONNECTION DIAGRAMS 9..........................
WIRING DIAGRAMS 10...............................
FAN AND MOTOR SPECIFICATIONS 15.................
REFRIGERANT COIL SPECIFICATIONS 16..............
REFRIGERATION CYCLE DIAGRAMS 17................
REFRIGERANT LINES 18.............................
SYSTEM EVACUATION AND CHARGING 19.............
ELECTRONIC FUNCTION 20..........................
TROUBLESHOOTING 21..............................
DIAGNOSTIC GUIDES 23.............................
DIAGNOSIS AND SOLUTION 29.......................
APPENDIX 46.......................................
DISASSEMBLY INSTRUCTIONS 52.....................
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.

Summary

SAFETY CONSIDERATIONS

Safety Alert Words and Signal Words

Explains DANGER, WARNING, and CAUTION signal words used in safety instructions.

SPECIFICATIONS

Unit Specifications

Lists technical specifications for different outdoor unit sizes.

CLEARANCES

Outdoor Unit Clearance Requirements

Specifies minimum clearance distances for outdoor unit installation.

ELECTRICAL DATA

Unit Electrical Specifications

Lists electrical data including voltage, MCA, MOCP, RLA, and FLA for various models.

CONNECTION DIAGRAMS

Indoor;Outdoor Unit Wiring Diagrams

Illustrates electrical connections between indoor and outdoor units for different voltage types.

WIRING DIAGRAMS

Outdoor Control Board Wiring (9 K & 12 K 115 V)

Shows the wiring diagram and component connections for the outdoor unit control board.

WIRING DIAGRAMS (CONTINUED)

Outdoor Control Board Wiring (9 K & 12 K 208;230 V)

Details wiring for the outdoor unit control board for 208/230V models.

Outdoor Control Board Wiring (18 K 208;230 V)

Illustrates the wiring connections for the 18K outdoor unit control board.

Outdoor Control Board Wiring (24 K 208;230 V)

Shows wiring for the 24K outdoor unit control board.

Outdoor Control Board Wiring (30 K 208;230 V)

Details wiring for the 30K outdoor unit control board.

FAN AND MOTOR SPECIFICATIONS

REFRIGERANT COIL SPECIFICATIONS

REFRIGERATION CYCLE DIAGRAMS

Heat Pump Refrigerant Cycle Diagram

REFRIGERANT LINES

Piping and Refrigerant Guidelines

Provides guidelines on refrigerant line sizing, lengths, and charge amounts.

SYSTEM EVACUATION AND CHARGING

Deep Vacuum Method

Details the procedure for achieving a deep vacuum in the system using a pump and gauge.

Triple Evacuation Method

Outlines the alternate method for system evacuation using dry nitrogen.

ELECTRONIC FUNCTION

System Protections

Explains various protective functions like compressor delay, temperature, and fan speed monitoring.

TROUBLESHOOTING

Troubleshooting Steps and Tools

Provides a systematic approach and necessary tools for diagnosing unit problems.

DIAGNOSTIC GUIDES

Indoor Unit Diagnostic Codes

Lists error codes displayed by the indoor unit and their corresponding LED status.

OUTDOOR UNIT ERROR DISPLAY

Error Display for 9-12 (115 V) Units

Illustrates the outdoor unit PCB and explains LED status for error indication.

Error Display for 9-12 (208-230 V) Units

Shows the outdoor unit PCB and explains LED status for error indication for 208-230V models.

Error Codes for Size 18 Unit

Error Display for Size 24 Unit

Error Display for Size 30 Unit

DIAGNOSIS AND SOLUTION

EEPROM Parameter Error (E0;F4)

DIAGNOSIS AND SOLUTION (CONTINUED)

Communication Error (E1)

Zero Crossing Detection Error (E2)

Fan Speed Control Error (E3;F5)

DC Fan Motor Diagnosis

Temperature Sensor Errors (E4;E5;F1-F3)

Refrigerant Leakage Detection (EC)

Overload Current Protection (F0)

IPM Malfunction;IGBT Protection (P0)

Voltage Protection (P1)

Compressor High Temperature Protection (P2)

Inverter Compressor Drive Error (P4)

MAIN PARTS CHECK

COMPRESSOR CHECKING

Compressor Winding Resistance

IPM CONTINUITY CHECK

COOLING CHARTS

Carrier 38MAQB30-3 Specifications

General

Cooling Capacity	30, 000 BTU
Heating Seasonal Performance Factor (HSPF)	10.0
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Compressor Type	Inverter
Stages	Variable
Type	Ductless Mini Split
Heating Capacity	30000 BTU/h
Power Supply	208/230V, 60 Hz
Operating Temperature (Heating)	5° - 86°F
Outdoor Unit Noise Level	56 dB
Indoor Unit Dimensions (H x W x D)	12.6 x 42.52 x 9.84 inches
Outdoor Unit Dimensions (H x W x D)	35.4 x 12.6 inches