Carrier 40MKCC - User Manual

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.....................................
ELECTRICAL DATA 9................................
POWER AND CONNECTING CABLES 10................
CONNECTION DIAGRAMS 11.........................
REFRIGERATION CYCLE DIAGRAMS 16................
REFRIGERANT LINES 17.............................
SYSTEM EVACUATION AND CHARGING 17.............
SEQUENCE OF OPERATION 18........................
TROUBLESHOOTING 19..............................
DISASSEMBLY 23....................................
APPENDIX 29.......................................
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 mo st serious h azards 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.

Summary

SAFETY CONSIDERATIONS

General Safety Warnings

Provides critical safety warnings for electrical shock, explosion, and equipment damage hazards.

Introduction

Provides an overview of the service manual's purpose and content.

MODEL; SERIAL NUMBER NOMENCLATURES

STANDARD FEATURES AND ACCESSORIES

SPECIFICATIONS - COOLING ONLY

SPECIFICATIONS - HEAT PUMP

INDOOR UNIT DIMENSIONS

OUTDOOR UNIT DIMENSIONS

CLEARANCES - INDOOR

CLEARANCES - OUTDOOR

ELECTRICAL DATA

POWER AND CONNECTING CABLES

CONNECTION DIAGRAMS

OUTDOOR UNIT SCHEMATIC DIAGRAM

OUTDOOR UNIT SCHEMATIC DIAGRAM (CONT.)

OUTDOOR UNIT SCHEMATIC DIAGRAM (CONT.)

OUTDOOR UNIT SCHEMATIC DIAGRAM (CONT.)

REFRIGERATION CYCLE DIAGRAMS

REFRIGERANT LINES

System Evacuation and Charging

Details procedures for evacuating and charging the refrigerant system.

SYSTEM EVACUATION AND CHARGING (CONT.)

Deep Vacuum Method

Procedure for achieving a deep vacuum using a vacuum pump and gauge.

Triple Evacuation Method

Procedure for triple evacuation when deep vacuum is not possible.

Sequence of Operation

Describes the unit's sequence of operation and user interface.

TROUBLESHOOTING

Indoor Unit Diagnostic Codes

Lists fault codes and their corresponding malfunctions for indoor units.

TROUBLESHOOTING (CONT.)

T1;T2 Temperature Sensor Diagnosis

Troubleshooting steps for open or short circuits in temperature sensors.

TROUBLESHOOTING (CONT.)

EEPROM Parameter Error Diagnosis

Troubleshooting steps for EEPROM parameter errors (E7).

TROUBLESHOOTING (CONT.)

Water-Level Alarm Diagnosis

Troubleshooting steps for water-level alarms (E8) and related components.

Critical Parts Troubleshooting

Provides guidance for temperature sensors and indoor fan motors.

DISASSEMBLY OF CASSETTE INDOOR UNIT

DISASSEMBLY OF CASSETTE INDOOR UNIT (CONT.)

Removing the Display Board

Steps to remove the indoor unit's display board.

Removing the PCB

Steps to remove the indoor unit's printed circuit board (PCB).

DISASSEMBLY OF CASSETTE INDOOR UNIT (CONT.)

Removing the Electronic Control Box

Steps to remove the indoor unit's electronic control box.

Removing the Panel

Steps to remove the indoor unit's front panel.

DISASSEMBLY OF CASSETTE INDOOR UNIT (CONT.)

Removing the Volute Shell

Steps to remove the indoor unit's volute shell.

Removing the Fan Wheel

Steps to remove the indoor unit's fan wheel.

DISASSEMBLY OF CASSETTE INDOOR UNIT (CONT.)

Removing the Fan Motor

Steps to remove the indoor unit's fan motor.

Removing the Water Collector Assembly

Steps to remove the indoor unit's water collector assembly.

DISASSEMBLY OF CASSETTE INDOOR UNIT (CONT.)

Removing the Drain Pump

Steps to remove the indoor unit's drain pump.

Removing the Evaporator

Steps to remove the indoor unit's evaporator.

APPENDIX

APPENDIX (CONT.)

Temperature Sensor Resistance Table

Table showing resistance values for T1, T2, T3, T4 sensors at various temperatures.

APPENDIX (CONT.)

Temperature Sensor Resistance Table for T5

Table showing resistance values for T5 sensor at various temperatures.

A4 Display Panel

A5 Temperature Conversion

Carrier 40MKCC Specifications

General

Brand	Carrier
Model	40MKCC
Category	Air Conditioner
Language	English