Service manual

SiUS041111
Table of Contents iv
4.8 Outdoor Unit PCB Abnormality................................................................... 89
4.9 OL Activation (Compressor Overload) ....................................................... 90
4.10 Compressor Lock ....................................................................................... 91
4.11 DC Fan Lock .............................................................................................. 92
4.12 Input Overcurrent Detection ....................................................................... 93
4.13 Four-Way Valve Abnormality...................................................................... 94
4.14 Discharge Pipe Temperature Control......................................................... 96
4.15 High Pressure Control in Cooling............................................................... 98
4.16 Compressor System Sensor Abnormality ................................................ 100
4.17 Position Sensor Abnormality .................................................................... 101
4.18 DC Voltage / Current Sensor Abnormality (09/12 Class Only)................. 103
4.19 Thermistor or Related Abnormality (Outdoor Unit)................................... 104
4.20 Electrical Box Temperature Rise.............................................................. 106
4.21 Radiation Fin Temperature Rise .............................................................. 108
4.22 Output Overcurrent Detection .................................................................. 110
4.23 Refrigerant Shortage................................................................................ 112
4.24 Low-voltage Detection or Over-voltage Detection.................................... 114
5. Check......................................................................................................116
5.1 Thermistor Resistance Check .................................................................. 116
5.2 Fan Motor Connector Output Check ........................................................ 117
5.3 Power Supply Waveforms Check............................................................. 118
5.4 Electronic Expansion Valve Check........................................................... 118
5.5 Four-Way Valve Performance Check....................................................... 119
5.6 Inverter Unit Refrigerant System Check................................................... 119
5.7 “Inverter Checker” Check ......................................................................... 120
5.8 Rotation Pulse Check on the Outdoor Unit PCB...................................... 122
5.9 Installation Condition Check..................................................................... 123
5.10 Discharge Pressure Check....................................................................... 124
5.11 Outdoor Fan System Check..................................................................... 124
5.12 Main Circuit Short Check.......................................................................... 125
5.13 Power Module Check ............................................................................... 126
Part 7
Removal Procedure...........................................................127
1. Indoor Unit: 09/12 Class..........................................................................128
1.1 Removal of Air Filters............................................................................... 128
1.2 Removal of Horizontal Blade.................................................................... 130
1.3 Removal of Front Panel............................................................................ 132
1.4 Removal of Front Grille ............................................................................ 133
1.5 Removal of Electrical Box / Vertical Blades ............................................. 134
1.6 Removal of Swing Motor / PCBs.............................................................. 139
1.7 Removal of Indoor Heat Exchanger ......................................................... 143
1.8 Removal of Fan Rotor / Fan Motor........................................................... 146
1.9 Exchange of Piping Direction (Drain Hose).............................................. 149
2. Indoor Unit: 15/18/24 Class.....................................................................150
2.1 Removal of Air Filters / Front Panel ......................................................... 150
2.2 Removal of Front Grille ............................................................................ 153