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
