Carrier 25HHA4 - User Manual

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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.

Main Page

Type	Heat Pump
Refrigerant	R-410A
Compressor Type	Scroll
Voltage	208/230V
Phase	1
Sound Level (Outdoor Unit)	72 dB

Type

Heat Pump

Refrigerant

R-410A

Compressor Type

Scroll

Voltage

208/230V

Phase

Sound Level (Outdoor Unit)

72 dB

Carrier 25HHA4 - User Manual

Table of Contents

Other manuals for Carrier 25HHA4

Summary

Safety Considerations

Standard Features and Accessories

Specifications - Cooling Only

Cooling Only Specifications Details

Specifications - Heat Pump

Heat Pump Specifications Details

Indoor Unit Dimensions

Outdoor Unit Dimensions

Indoor Unit Clearances

Outdoor Unit Clearances

Electrical Data

Cooling Only Electrical Data

Heat Pump Electrical Data

Indoor Unit Electrical Data

Power and Connecting Cables

Connection Diagrams

Wiring Diagrams

Wiring Diagrams (Cont.)

Refrigeration Cycle Diagrams

Refrigerant Lines

Maximum Refrigerant Line Lengths

Refrigerant Pipe Sizes

Refrigerant Charge Requirements

System Evacuation and Charging

Vacuum Pump Evacuation

System Evacuation and Charging (Cont.)

Deep Vacuum Method

Triple Evacuation Method

Troubleshooting

Indoor Unit Diagnostic Codes

Troubleshooting (Cont.)

T1;T2 Temperature Sensor Diagnosis

EEPROM Parameter Error Diagnosis

Water-Level Alarm Diagnosis

Disassembly of Cassette Indoor Unit

Remove the Filter

Disassembly of Cassette Indoor Unit (Cont.)

Remove the Display Board

Remove the PCB

Remove the Electronic Control Box

Remove the Panel