Single Split Wall Mounted K-Series Service Manual

This Service Manual is for Inverter Pair Wall Mounted Type K-Series

 

Cooling Only:

Indoor Units: FTXN09KEVJU ; FTXN12KEVJU ; FTXN15KVJU ; FTXN18KVJU ; FTXN24KVJU
Outdoor Units: RKN09KEVJU ; RKN12KEVJU ; RKN15KEVJU ; RKN18KEVJU ; RKN24KEVJU

 

Heat Pump:

Indoor Units: FTXN09KEVJU ; FTXN12KEVJU ; FTXN15KVJU ; FTXN18KVJU ; FTXN24KVJU
Outdoor Units: RXN09KEVJU ; RXN12KEVJU ; RXN15KEVJU ; RXN18KEVJU ; RXN24KEVJU

 

CONTENTS:

  • Safety Consideration …
  • List of Functions … page 1

  • 1. Functions … page 2
  • Specifications … page 4

  • 1. Specifications … page 5
  • 1.1 Cooling Only … page 5
  • 1.2 Heat Pump … page 8
  • Printed Circuit Board
    Connector Wiring Diagram … page 11

  • 1. Indoor Unit … page 12
  • 1.1 09/12 Class … page 12
  • 1.2 15/18/24 Class … page 14
  • 2. Outdoor Unit … page 16
  • 2.1 09/12 Class … page 16
  • 2.2 15/18/24 Class … page 18
  • Function and Control … page 20

  • 1. Main Functions … page 21
  • 1.1 Temperature Control … page 21
  • 1.2 Frequency Principle … page 21
  • 1.3 Airflow Direction C
    ontrol … page 23
  • 1.4 Fan Speed Control
    for Indoor Unit … page 24
  • 1.5 Program Dry Operation … page 25
  • 1.6 Automatic Operation … page 26
  • 1.7 Thermostat Control … page 27
  • 1.8 NIGHT SET Mode … page 28
  • 1.9 ECONO Operation … page 29
  • 1.10 Inverter POWERFUL
    Operation … page 30
  • 1.11 Other Functions … page 31
  • 2. Function of Thermistor … page 32
  • 3. Control Specification … page 33
  • 3.1 Mode Hierarchy … page 33
  • 3.2 Frequency Control … page 34
  • 3.3 Controls at Mode Changing /
    Start-up … page 36
  • 3.4 Discharge Pipe Temperature
    Control … page 39
  • 3.5 Input Current Control … page 40
  • 3.6 Freeze-up Protection
    Control … page 41
  • 3.7 Heating Peak-cut Control … page 41
  • 3.8 Outdoor Fan Control … page 42
  • 3.9 Liquid Compression
    Protection Function … page 42
  • 3.10 Defrost Control … page 43
  • 3.11 Electronic Expansion
    Valve Control … page 45
  • 3.12 Malfunctions … page 48
  • Operation Manual … page 49

  • 1. System Configuration … page 50
  • 2. 09/12 Class … page 51
  • 2.1 Remote Controller … page 51
  • 2.2 AUTO · DRY · COOL · HEAT ·
    FAN Operation … page 53
  • 2.3 Adjusting the Airflow
    Direction and Rate … page 55
  • 2.4 COMFORT AIRFLOW Operation … page 57
  • 2.5 POWERFUL Operation … page 58
  • 2.6 ECONO Operation … page 59
  • 2.7 OFF TIMER Operation … page 60
  • 2.8 ON TIMER Operation … page 61
  • 3. 15/18/24 Class … page 62
  • 3.1 Remote Controller … page 62
  • 3.2 AUTO · DRY · COOL · HEAT ·
    FAN Operation … page 64
  • 3.3 Adjusting the Airflow
    Direction and Rate … page 66
  • 3.4 POWERFUL Operation … page 68
  • 3.5 OFF TIMER Operation … page 69
  • 3.6 ON TIMER Operation … page 70
  • Service Diagnosis … page 71

  • 1. Troubleshooting with LED … page 73
  • 1.1 Indoor Unit … page 73
  • 1.2 Outdoor Unit … page 73
  • 2. Problem Symptoms and
    Measures … page 74
  • 3. Service Check Function … page 75
  • 4. Troubleshooting … page 78
  • 4.1 Error Codes and Description … page 78
  • 4.2 Indoor Unit PCB Abnormality … page 79
  • 4.3 Freeze-up Protection Control
    or Heating Peak-cut Control … page 80
  • 4.4 Fan Motor (DC Motor) or Related
    Abnormality … page 82
  • 4.5 Thermistor or Related
    Abnormality (Indoor Unit) … page 85
  • 4.6 Signal Transmission Error (between
    Indoor Unit and Outdoor Unit) … page 86
  • 4.7 Unspecified Voltage (between
    Indoor Unit and Outdoor Unit) … page 88
  • 4.8 Outdoor Unit PCB Abnormality … page 89
  • 4.9 OL Activation (Compressor
    Overload) … page 90
  • 4.10 Compressor Lock … page 91
  • 4.11 DC Fan Lock … page 92
  • 4.12 Input Overcurrent Detection … page 93
  • 4.13 Four-Way Valve Abnormality … page 94
  • 4.14 Discharge Pipe Temperature
    Control … page 96
  • 4.15 High Pressure Control in
    Cooling … page 98
  • 4.16 Compressor System Sensor
    Abnormality … page 100
  • 4.17 Position Sensor Abnormality … page 101
  • 4.18 DC Voltage / Current Sensor
    Abnormality (09/12 Class Only) … page 103
  • 4.19 Thermistor or Related Abnormality
    (Outdoor Unit) … page 104
  • 4.20 Electrical Box Temperature
    Rise … page 106
  • 4.21 Radiation Fin Temperature
    Rise … page 108
  • 4.22 Output Overcurrent
    Detection … page 110
  • 4.23 Refrigerant Shortage … page 112
  • 4.24 Low-voltage Detection or
    Over-voltage Detection … page 114
  • 5. Check … page 116
  • 5.1 Thermistor Resistance
    Check … page 116
  • 5.2 Fan Motor Connector
    Output Check … page 117
  • 5.3 Power Supply Waveforms
    Check … page 118
  • 5.4 Electronic Expansion
    Valve Check … page 118
  • 5.5 Four-Way Valve Performance
    Check … page 119
  • 5.6 Inverter Unit Refrigerant
    System Check … page 119
  • 5.7 “Inverter Checker”
    Check … page 120
  • 5.8 Rotation Pulse Check on the
    Outdoor Unit PCB … page 122
  • 5.9 Installation Condition
    Check … page 123
  • 5.10 Discharge Pressure
    Check … page 124
  • 5.11 Outdoor Fan System
    Check … page 124
  • 5.12 Main Circuit Short
    Check … page 125
  • 5.13 Power Module Check … page 126
  • Removal Procedure … page 127

  • 1. Indoor Unit: 09/12
    Class … page 128
  • 1.1 Removal of Air Filters … page 128
  • 1.2 Removal of Horizontal
    Blade … page 130
  • 1.3 Removal of Front Panel … page 132
  • 1.4 Removal of Front Grille … page 133
  • 1.5 Removal of Electrical Box /
    Vertical Blades … page 134
  • 1.6 Removal of Swing Motor /
    PCBs … page 139
  • 1.7 Removal of Indoor Heat
    Exchanger … page 143
  • 1.8 Removal of Fan Rotor /
    Fan Motor … page 146
  • 1.9 Exchange of Piping Direction
    (Drain Hose) … page 149
  • 2. Indoor Unit: 15/18/24
    Class … page 150
  • 2.1 Removal of Air Filters /
    Front Panel … page 150
  • 2.2 Removal of Front Grille … page 153
  • 2.3 Removal of Horizontal Blades /
    Vertical Blades … page 155
  • 2.4 Removal of Electrical Box / PCBs /
    Swing Motors … page 157
  • 2.5 Removal of Indoor
    Heat Exchanger … page 162
  • 2.6 Removal of Fan Motor /
    Fan Rotor … page 165
  • 3. Outdoor Unit: 09/12
    Class … page 167
  • 3.1 Removal of Outer
    Panels … page 167
  • 3.2 Removal of Outdoor Fan /
    Fan Motor … page 171
  • 3.3 Removal of Electrical Box /
    PCB … page 173
  • 3.4 Removal of Sound Blankets … page 185
  • 3.5 Removal of Four-Way Valve … page 187
  • 3.6 Removal of Compressor … page 190
  • 4. Outdoor Unit: 15/18/24 Class … page 191
  • 4.1 Removal of Outer Panels … page 191
  • 4.2 Removal of Outdoor Fan /
    Fan Motor … page 194
  • 4.3 Removal of Electrical
    Box … page 198
  • 4.4 Removal of PCBs … page 206
  • 4.5 Removal of Sound Blankets … page 213
  • 4.6 Removal of Electronic Expansion
    Valve AssemblyASSY … page 216
  • 4.7 Removal of Four-Way
    Valve … page 217
  • 4.8 Removal of Compressor … page 218
  • Trial Operation and
    Field Settings … page 220

  • 1. Pump Down Operation … page 221
  • 2. Forced Cooling Operation … page 222
  • 3. Trial Operation … page 223
  • 4. Field Settings … page 224
  • 4.1 Model Type Setting … page 224
  • 4.2 Temperature Display
    Switch … page 224
  • 4.3 When 2 Units are Installed
    in 1 Room … page 225
  • 4.4 Facility Setting Switch
    (cooling at low outdoor temperature) … page 226
  • 4.5 Jumper Settings … page 227
  • 5. Application of Silicon Grease to a Power
    Transistor and a Diode Bridge … page 228
  • Appendix … page 229

  • 1. Piping Diagrams … page 230
  • 1.1 Indoor unit … page 230
  • 1.2 Outdoor Unit … page 231
  • 2. Wiring Diagrams … page 233
  • 2.1 Indoor Unit … page 233
  • 2.2 Outdoor Unit … page 234