Carrier DHMSHAQ12XA3 - User Manual

Service Manual
DHMSHA
High Wall Ductless System
Sizes 09 to 36
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 1...................................
MODEL/SERIAL NUMBER NOMENCLATURES 2.........
SPECIFICATIONS 3...................................
COMPATIBILITY 3...................................
DIMENSIONS 4.....................................
CLEARANCES 4.....................................
ELECTRICAL DATA 5................................
WIRING 5...........................................
CONNECTION DIAGRAMS 6..........................
WIRING DIAGRAMS 7................................
REFRIGERATION CYCLE DIAGRAMS 9.................
REFRIGERANT LINES 9..............................
SYSTEM EVACUATION AND CHARGING 10.............
TROUBLESHOOTING 15..............................
INDOOR UNIT DIAGNOSTIC GUIDE 16.................
DIAGNOSIS AND SOLUTION 17.......................
APPENDIX 34.......................................
DISASSEMBLY INSTRUCTIONS 38.....................
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 indoor 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 Precautions for Installation and Service

SPECIFICATIONS

ELECTRICAL DATA

Wiring Recommendations

CONNECTION DIAGRAMS

WIRING DIAGRAMS

WIRING DIAGRAMS (CONT)

REFRIGERATION CYCLE DIAGRAMS

SYSTEM EVACUATION AND CHARGING

Deep Vacuum Method

Describes the process and equipment required for achieving a deep vacuum (500 microns) in the system.

Triple Evacuation Method

Outlines the steps for performing a triple evacuation using dry nitrogen to ensure a contaminant-free system.

Information Enquiry

TROUBLESHOOTING

Electrical Safety - Capacitor Discharge

Warns about stored electrical charge in capacitors and provides instructions for safe discharge.

INDOOR UNIT DIAGNOSTIC GUIDE

Indoor Unit Error Display and LED Status

A table correlating operation lamp flashes, timer lamp states, display codes (E0-F5, P0-P4), and LED status with specific errors.

DIAGNOSIS AND SOLUTION

EEPROM Parameter Error Diagnosis (E0;F4)

Details malfunction conditions, supposed causes, and troubleshooting steps for EEPROM parameter errors.

Communication Error Diagnosis (E1)

Covers malfunction conditions, causes, and troubleshooting for indoor/outdoor unit communication errors.

Testing DC Voltage and Reactor Resistance

Zero Crossing Detection Error Diagnosis (E2)

Details malfunction conditions, causes, and troubleshooting for zero crossing detection errors.

Fan Speed Out of Control Diagnosis (E3;F5)

Covers malfunction conditions, causes, and troubleshooting steps for indoor fan speed control issues.

DC Fan Motor Diagnosis

Temperature Sensor Circuit Diagnosis

Details malfunction conditions, causes, and troubleshooting for open circuit or short circuit of temperature sensors.

Refrigerant Leakage Detection Diagnosis (EC)

Covers malfunction conditions, causes, and troubleshooting for refrigerant leakage detection errors.

Overload Current Protection Diagnosis (F0)

Details malfunction conditions, causes, and troubleshooting steps for overload current protection.

IPM Malfunction Diagnosis (P0)

Covers malfunction conditions, causes, and troubleshooting for IPM malfunction or over-strong current protection.

Over Voltage;Low Voltage Protection Diagnosis (P1)

Details malfunction conditions, causes, and troubleshooting for over voltage or low voltage protection.

Compressor High Temperature Protection Diagnosis (P2)

Covers malfunction conditions, causes, and troubleshooting for compressor high temperature protection.

Inverter Compressor Drive Error Diagnosis (P4)

Details malfunction conditions, causes, and troubleshooting for inverter compressor drive errors.

Main Parts Check

IPM Continuity Check

IPM Resistance Measurement

DISASSEMBLY INSTRUCTIONS

DISASSEMBLY INSTRUCTIONS (CONT)

Carrier DHMSHAQ12XA3 Specifications

General

Model	DHMSHAQ12XA3
Cooling Capacity	12000 BTU/h
Cooling Capacity (Ton)	1 Ton
Refrigerant	R-410A
Voltage	208/230 V
Smart Control	Yes
Air Flow (High)	350 CFM
Net Weight (Outdoor Unit)	35 kg
Power Supply	60 Hz
Type	Mini Split Air Conditioner